app.js

/* ============================================================
   TSCRIC-LoRa Dashboard — app.js v4.0 RESEARCH EDITION
   Original v3.0 fully preserved + new systems added
   ============================================================ */

// ============================================================
// LOGIN
// ============================================================
const DASHBOARD_PASSWORD = "Aman";

function doLogin() {
  const passEl = document.getElementById('loginPass');
  const errEl  = document.getElementById('loginError');
  if (!passEl) return;
  if (passEl.value.trim() === DASHBOARD_PASSWORD) {
    setDisplay('loginScreen','none');
    setDisplay('mainHeader','block');
    setDisplay('mainContent','block');
    if (errEl) errEl.style.display = 'none';
    sessionStorage.setItem('tscric_auth','1');
    loadChartJS();
    initFirebase();
  } else {
    if (errEl) errEl.style.display = 'block';
    passEl.value = ''; passEl.focus();
  }
}

function doLogout() {
  sessionStorage.removeItem('tscric_auth');
  setDisplay('mainHeader','none'); setDisplay('mainContent','none');
  setDisplay('loginScreen','flex');
  const p = document.getElementById('loginPass');
  if (p) p.value = '';
}

// ============================================================
// FIREBASE CONFIG
// ============================================================
const FIREBASE_CONFIG = {
  apiKey:            "AIzaSyDtWF8l4QCBdwmojwClGfd32AVNuf8alAk",
  authDomain:        "ai-irrigation-system-1e112.firebaseapp.com",
  databaseURL:       "https://ai-irrigation-system-1e112-default-rtdb.firebaseio.com",
  projectId:         "ai-irrigation-system-1e112",
  storageBucket:     "ai-irrigation-system-1e112.firebasestorage.app",
  messagingSenderId: "1052849462072",
  appId:             "1:1052849462072:web:a1062de83ec2f869a8ffcd"
};

// ============================================================
// CONSTANTS
// ============================================================
const BIGHA_TO_M2  = 1333.33;
const MAX_HISTORY  = 50;
const OWM_DIRECT_KEY = "e4efeb48999d7e673042ae4700395ed2";
let owmDirectData = null;

const CROP_DATA = [
  { name:"Wheat",     delta:450,  fc:38, pwp:13 },
  { name:"Rice",      delta:1200, fc:50, pwp:28 },
  { name:"Maize",     delta:550,  fc:38, pwp:13 },
  { name:"Cotton",    delta:750,  fc:37, pwp:13 },
  { name:"Soybean",   delta:500,  fc:37, pwp:13 },
  { name:"Chickpea",  delta:350,  fc:35, pwp:12 },
  { name:"Mustard",   delta:380,  fc:34, pwp:12 },
  { name:"Sugarcane", delta:1800, fc:42, pwp:16 }
];

const WEATHER_LOCATIONS = {
  bhopal:{label:"Bhopal",lat:23.26,lon:77.41,alt:527},
  indore:{label:"Indore",lat:22.72,lon:75.86,alt:553},
  jabalpur:{label:"Jabalpur",lat:23.18,lon:79.94,alt:412},
  gwalior:{label:"Gwalior",lat:26.22,lon:78.18,alt:197},
  ujjain:{label:"Ujjain",lat:23.18,lon:75.78,alt:491},
  sagar:{label:"Sagar",lat:23.84,lon:78.74,alt:523},
  rewa:{label:"Rewa",lat:24.53,lon:81.30,alt:327},
  satna:{label:"Satna",lat:24.60,lon:80.83,alt:318},
  chhindwara:{label:"Chhindwara",lat:22.06,lon:78.93,alt:682},
  vidisha:{label:"Vidisha",lat:23.52,lon:77.81,alt:430},
  hoshangabad:{label:"Hoshangabad",lat:22.75,lon:77.72,alt:310},
  narsinghpur:{label:"Narsinghpur",lat:22.95,lon:79.19,alt:363},
  delhi:{label:"New Delhi",lat:28.61,lon:77.20,alt:216},
  mumbai:{label:"Mumbai",lat:19.08,lon:72.88,alt:14},
  pune:{label:"Pune",lat:18.52,lon:73.86,alt:560},
  nagpur:{label:"Nagpur",lat:21.15,lon:79.09,alt:310},
  lucknow:{label:"Lucknow",lat:26.85,lon:80.95,alt:111},
  patna:{label:"Patna",lat:25.60,lon:85.12,alt:55},
  jaipur:{label:"Jaipur",lat:26.91,lon:75.79,alt:431},
  chandigarh:{label:"Chandigarh",lat:30.73,lon:76.78,alt:321},
  hyderabad:{label:"Hyderabad",lat:17.38,lon:78.47,alt:536},
  bangalore:{label:"Bengaluru",lat:12.97,lon:77.59,alt:920},
  ahmedabad:{label:"Ahmedabad",lat:23.03,lon:72.58,alt:55},
  kolkata:{label:"Kolkata",lat:22.57,lon:88.36,alt:9},
  amritsar:{label:"Amritsar",lat:31.63,lon:74.87,alt:234},
  varanasi:{label:"Varanasi",lat:25.32,lon:83.00,alt:80},
  agra:{label:"Agra",lat:27.18,lon:78.01,alt:169}
};

// ============================================================
// STATE
// ============================================================
let firebaseApp=null, firebaseDB=null;
let irrigHistory=[], lastData=null, isConnected=false;
let selectedWeatherLocation='bhopal';
let watchdogTimer=null, lastDataTime=0;
let localConfig={plotArea_m2:6.0, plotArea_bigha:6.0/BIGHA_TO_M2, crop:0, weatherLocation:'bhopal'};
let updatingM2=false, updatingBigha=false;
let calibData=[
  {adc_dry:850,adc_fc:600,adc_pwp:750,vwc_fc:0.35,vwc_pwp:0.12},
  {adc_dry:845,adc_fc:595,adc_pwp:745,vwc_fc:0.35,vwc_pwp:0.12},
  {adc_dry:855,adc_fc:605,adc_pwp:755,vwc_fc:0.35,vwc_pwp:0.12}
];

// v4.0 state
const CHART_BUF = 60;
let chartBuffers={labels:[],sm1:[],sm2:[],sm3:[],csmi:[],flow:[],aiScore:[],eto:[],rainfall:[],effectiveRain:[],appliedL:[],rainfallL:[],etoLoss:[],temp:[],hum:[]};
let chartInstances={}, chartsReady=false;
let alertList_data=[], alertIdCounter=0;
let lastPumpState=false, lastFlowRate=0;
let tipAccum_mm=0, lastRainEvent=null;
let loraPacketCount=0, loraTxTimestamp=0;

// ============================================================
// INIT
// ============================================================
document.addEventListener('DOMContentLoaded',()=>{
  if(sessionStorage.getItem('tscric_auth')==='1'){
    setDisplay('loginScreen','none');
    setDisplay('mainHeader','block');
    setDisplay('mainContent','block');
    loadHistory(); updatePreviewCard(0,6.0);
    loadChartJS(); initFirebase();
  } else {
    setTimeout(()=>{const el=document.getElementById('loginPass');if(el)el.focus();},300);
  }
});

// ============================================================
// CHART.JS LAZY LOAD
// ============================================================
function loadChartJS(){
  if(window.Chart){initAllCharts();return;}
  const s=document.createElement('script');
  s.src='https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.1/chart.umd.min.js';
  s.onload=()=>{chartsReady=true;initAllCharts();};
  s.onerror=()=>console.warn('Chart.js load failed');
  document.head.appendChild(s);
}

// ============================================================
// FIREBASE INIT
// ============================================================
function initFirebase(){
  loadHistory(); updatePreviewCard(localConfig.crop,localConfig.plotArea_m2);
  loadScript('https://www.gstatic.com/firebasejs/9.23.0/firebase-app-compat.js',()=>{
    loadScript('https://www.gstatic.com/firebasejs/9.23.0/firebase-database-compat.js',()=>{
      try{
        if(!firebaseApp) firebaseApp=firebase.initializeApp(FIREBASE_CONFIG);
        firebaseDB=firebase.database();
        startSensorsListener(); startConfigListener();
        fetchOWMDirect(); setInterval(fetchOWMDirect,600000);
        setConnectionStatus('online');
        if(watchdogTimer) clearInterval(watchdogTimer);
        watchdogTimer=setInterval(connectionWatchdog,10000);
        setInterval(updateLoRaDiagnostics,30000);
        setInterval(updateSoilHealthEstimates,60000);
        setInterval(checkRainfallIntelligence,120000);
      }catch(e){
        console.error(e); setConnectionStatus('error'); showAlert('Firebase init failed: '+e.message);
      }
    });
  });
  bootstrapAIChat();
}

function loadScript(src,cb){
  const s=document.createElement('script'); s.src=src; s.onload=cb;
  s.onerror=()=>{setConnectionStatus('error');showAlert('SDK load failed');};
  document.head.appendChild(s);
}

function startSensorsListener(){
  firebaseDB.ref('tscric/sensors').on('value',snap=>{
    const data=snap.val();
    if(data){lastData=data;isConnected=true;lastDataTime=Date.now();setConnectionStatus('online');updateDashboard(data);updateLastUpdateTime();}
  },err=>{console.error(err);isConnected=false;setConnectionStatus('error');});
}

function startConfigListener(){
  firebaseDB.ref('tscric/config').on('value',snap=>{
    const cfg=snap.val(); if(!cfg) return;
    if(cfg.plotArea!==undefined){
      const area=parseFloat(cfg.plotArea);
      if(area>=1&&area<=100000){
        localConfig.plotArea_m2=area; localConfig.plotArea_bigha=area/BIGHA_TO_M2;
        silentFill('plotAreaM2',area.toFixed(2)); silentFill('plotAreaBigha',(area/BIGHA_TO_M2).toFixed(6));
        updatePreviewCard(localConfig.crop,area); updateLiveAreaBanner(area);
      }
    }
    if(cfg.crop!==undefined){
      const c=parseInt(cfg.crop); if(c>=0&&c<=7){
        localConfig.crop=c; const sel=document.getElementById('cropSelectMain'); if(sel) sel.value=c;
        updatePreviewCard(c,localConfig.plotArea_m2);
      }
    }
    if(cfg.weatherLocation!==undefined&&WEATHER_LOCATIONS[cfg.weatherLocation]){
      selectedWeatherLocation=cfg.weatherLocation; localConfig.weatherLocation=cfg.weatherLocation;
      const sel=document.getElementById('weatherLocation'); if(sel) sel.value=cfg.weatherLocation;
      onWeatherLocationChange(cfg.weatherLocation);
    }
  });
}

function saveConfig(){
  if(!firebaseDB){showAlert("Firebase not connected");return;}
  const m2=localConfig.plotArea_m2;
  const loc=WEATHER_LOCATIONS[localConfig.weatherLocation]||WEATHER_LOCATIONS.bhopal;
  firebaseDB.ref('tscric/config').set({
    plotArea:parseFloat(m2.toFixed(2)), plotArea_bigha:parseFloat((m2/BIGHA_TO_M2).toFixed(6)),
    crop:localConfig.crop, cropName:CROP_DATA[localConfig.crop].name,
    weatherLocation:localConfig.weatherLocation, weatherLocationLabel:loc.label,
    weatherLat:loc.lat, weatherLon:loc.lon, weatherAlt:loc.alt, updatedAt:Date.now()
  }).then(()=>{showSavedBadge();updateLiveAreaBanner(m2);})
    .catch(e=>showAlert("Save failed: "+e.message));
}

function sendCmd(cmd){
  if(!firebaseDB){showAlert("Firebase not connected");return;}
  const MAP={pump_on:{pumpOn:true,pumpOff:false},pump_off:{pumpOn:false,pumpOff:true},auto_on:{auto:true},manual_on:{auto:false}};
  firebaseDB.ref('tscric/commands').update(MAP[cmd]).catch(e=>showAlert("Command error: "+e.message));
}

function saveCalibration(){
  if(!firebaseDB){showAlert("Firebase not connected");return;}
  const payload={soilCalib:{}};
  for(let i=0;i<3;i++){
    const d={
      adc_dry:parseInt(document.getElementById('calib_dry_'+i)?.value)||calibData[i].adc_dry,
      adc_fc: parseInt(document.getElementById('calib_fc_'+i)?.value) ||calibData[i].adc_fc,
      adc_pwp:parseInt(document.getElementById('calib_pwp_'+i)?.value)||calibData[i].adc_pwp,
      vwc_fc: parseFloat(document.getElementById('vwc_fc_'+i)?.value) ||calibData[i].vwc_fc,
      vwc_pwp:parseFloat(document.getElementById('vwc_pwp_'+i)?.value)||calibData[i].vwc_pwp
    };
    calibData[i]=d; payload.soilCalib['ch'+i]=d;
  }
  firebaseDB.ref('tscric/config').update(payload).then(()=>{
    const b=document.getElementById('calibSavedBadge');
    if(b){b.style.display='inline-block';setTimeout(()=>b.style.display='none',3000);}
  }).catch(e=>showAlert("Calib save failed: "+e.message));
}
// ============================================================
// MASTER DASHBOARD UPDATE
// ============================================================
function updateDashboard(d){
  const sm1=fv(d.sm1),sm2=fv(d.sm2),sm3=fv(d.sm3),csmi=fv(d.csmi);
  setText('sm1Val',sm1.toFixed(1)+'%'); setText('sm2Val',sm2.toFixed(1)+'%');
  setText('sm3Val',sm3.toFixed(1)+'%'); setText('csmiVal',csmi.toFixed(1)+'%');
  setBarHeight('bar1',sm1); setBarHeight('bar2',sm2); setBarHeight('bar3',sm3); setBarHeight('barCSMI',csmi);

  setText('tempVal',fv(d.temperature).toFixed(1)); setText('humVal',fv(d.humidity).toFixed(0));
  setText('presVal',fv(d.pressure).toFixed(1));    setText('flowVal',fv(d.flowRate).toFixed(2));
  setText('aiScore',fv(d.aiScore).toFixed(1));
  setText('smvVal',fv(d.smv).toFixed(4));    setText('smaVal',fv(d.sma).toFixed(4));
  setText('tprVal',fv(d.tprScore).toFixed(3));setText('etoVal',fv(d.eto).toFixed(2));
  setText('rainVal',fv(d.rainProb).toFixed(0));
  setText('cropName',d.crop||'--'); setText('stageName',d.stage||'--'); setText('gddVal',fv(d.gdd).toFixed(0));

  // OWM
  const owmOK=d.owm_valid===true;
  setText('owmTemp',    owmOK?fv(d.owm_temp).toFixed(1)+' \u00b0C':'--');
  setText('owmHumidity',owmOK?fv(d.owm_humidity).toFixed(0)+' %':'--');
  setText('owmPressure',owmOK?fv(d.owm_pressure).toFixed(1)+' hPa':'--');
  setText('owmRain',    owmOK?fv(d.owm_rain_mm).toFixed(2)+' mm':'--');
  const owmEl=document.getElementById('owmStatus');
  if(owmEl){owmEl.textContent=owmOK?'\ud83d\udfe2 OWM Live':'\ud83d\udd34 OWM Unavailable';owmEl.className='owm-status '+(owmOK?'owm-live':'owm-dead');}

  // Comparison
  if(owmOK){
    const td=fv(d.temperature)-fv(d.owm_temp), hd=fv(d.humidity)-fv(d.owm_humidity);
    setText('cmpTemp',(td>=0?'+':'')+td.toFixed(1)+' \u00b0C vs OWM');
    setText('cmpHum', (hd>=0?'+':'')+hd.toFixed(0)+' % vs OWM');
    setEl('cmpTemp',el=>el.style.color=Math.abs(td)>3?'var(--orange)':'var(--green-light)');
    setEl('cmpHum', el=>el.style.color=Math.abs(hd)>10?'var(--orange)':'var(--green-light)');
  } else {
    setText('cmpTemp','OWM offline'); setText('cmpHum','OWM offline');
  }

  updateSensorHealth(d);

  // Water budget
  const applied=fv(d.deltaApplied),required=fv(d.deltaRequired),balance=fv(d.deltaBalance);
  const totalFlow=fv(d.totalLitres),effRain=fv(d.effectiveRain),estRain=fv(d.estimatedRain),rainCtrib=fv(d.rainfallContrib);
  setText('appliedVal',  applied.toFixed(1)+' L'); setText('requiredVal',required.toFixed(1)+' L');
  setText('balanceVal',  balance.toFixed(1)+' L'); setText('totalFlowVal',totalFlow.toFixed(1)+' L');
  setText('rainfallContrib',rainCtrib.toFixed(1)+' L');
  const pct=required>0?Math.min((applied/required)*100,100):0;
  setEl('budgetProgress',el=>el.style.width=pct.toFixed(1)+'%');
  setText('budgetPct',pct.toFixed(1)+'% of seasonal budget used');
  const eff=required>0?Math.min(((applied+rainCtrib)/required)*100,100):0;
  setText('irrigEfficiency',eff.toFixed(1)+'%');

  // Rainfall
  const tipMM=fv(d.tipBucket_mm), owmMM=owmOK?fv(d.owm_rain_mm):0;
  setText('tipBucketVal',   tipMM>0 ?tipMM.toFixed(2)+' mm':'No data');
  setText('owmRainfall',    owmMM>0 ?owmMM.toFixed(2)+' mm':'No data');
  setText('estimatedRainVal',estRain>0?'~'+estRain.toFixed(1)+' mm':'None detected');
  setText('effectiveRainVal',effRain.toFixed(2)+' mm');

  const rainProb=fv(d.rainProb);
  setText('rainProbVal',rainProb.toFixed(0)+'%');
  const rpBar=document.getElementById('rainProbBar');
  if(rpBar){rpBar.style.width=rainProb+'%';rpBar.style.background=rainProb>75?'#f85149':rainProb>35?'#f0a500':'#2ea043';}
  setText('rainCategory',rainProb<20?'\u2600\ufe0f Clear':rainProb<40?'\u26c5 Possible':rainProb<70?'\ud83c\udf26\ufe0f Likely':'\ud83c\udf27\ufe0f Rain Expected');

  // Pump
  const pumpOn=d.pump||false, autoMode=d.autoMode!==undefined?d.autoMode:true, faultOn=d.pipelineFault||false;
  setText('pumpStatusText',pumpOn?'\ud83d\udca7 PUMP ON':'\u2b55 PUMP OFF');
  setText('pumpModeText',autoMode?'\ud83e\udd16 Auto Mode':'\u270b Manual Mode');
  setEl('pumpIndicator',el=>el.className='pump-indicator'+(pumpOn?' on':''));
  setDisplay('faultBanner',faultOn?'block':'none');

  // Mode banners
  const safeMode=d.safeMode||false, offlineMode=d.offlineMode||false, adaptiveMode=d.adaptiveMode||false;
  setDisplay('safeModePanel',safeMode?'block':'none');
  setDisplay('offlineBanner',(offlineMode||adaptiveMode)?'block':'none');
  if(offlineMode||adaptiveMode) setText('offlineBannerMsg',adaptiveMode?'\ud83c\udf3f Adaptive Root-Zone Control Mode (Offline)':'\ud83d\udce1 Autonomous Offline Mode \u2014 Data stored locally');

  setDisplay('dhtFallbackBadge',(d.dhtFallback||false)?'inline-block':'none');
  setDisplay('bmpFallbackBadge',(d.bmpFallback||false)?'inline-block':'none');

  // AI circle color
  const score=fv(d.aiScore);
  setEl('aiCircle',el=>el.className='ai-circle '+(score>=65?'high':score>=35?'medium':'low'));

  // Remaining
  const daysRem=balance>0&&fv(d.eto)>0?((balance/(fv(d.eto)*(fv(d.plotArea_m2)||localConfig.plotArea_m2)*0.001)).toFixed(0)):'0';
  setText('daysRemaining',daysRem+' days'); setText('balRemaining',balance.toFixed(1)+' L');
  if(d.plotArea_m2) updateLiveAreaBanner(parseFloat(d.plotArea_m2));
  setText('connMode',d.wifiMode||'--');

  const wifiOnline=(d.wifiMode==='Online');
  setText('connStatus2',wifiOnline?'\ud83d\udfe2 Online':'\ud83d\udd34 Offline / Hotspot');
  setEl('connStatus2',el=>{el.style.background=wifiOnline?'rgba(46,160,67,0.15)':'rgba(248,81,73,0.12)';el.style.color=wifiOnline?'var(--green-light)':'var(--red)';});
  setText('loraStatus','Active');
  const pendingLogs=fv(d.offlineLogCount)||0;
  setText('offlineLogCount',pendingLogs>0?pendingLogs+' pending':'0 (synced)');
  setEl('offlineLogCount',el=>el.style.color=pendingLogs>0?'var(--orange)':'var(--green-light)');
  setText('cropStageInfo','Stage: '+(d.stage||'--')+'\u00a0|\u00a0GDD: '+fv(d.gdd).toFixed(0)+' \u00b0C\u00b7day');
  setText('owmPressure2',owmOK?'OWM: '+fv(d.owm_pressure).toFixed(1)+' hPa':'OWM: --');

  // History on pump ON
  if(pumpOn&&!lastPumpState){
    addHistoryEntry({time:new Date().toLocaleTimeString(),csmi:csmi.toFixed(1),ai:score.toFixed(1),dose:totalFlow.toFixed(1),reason:adaptiveMode?'Adaptive':autoMode?'Auto-AI':'Manual'});
  }
  lastPumpState=pumpOn;

  // v4.0 extensions
  appendChartData(d,owmOK);
  updateExplainabilityEngine(d,owmOK);
  runAlertEngine(d,owmOK);
  updateFaultDiagnostics(d);
  updateTippingBucketPanel(d);
  updateLoRaDiagnostics(d);
  updateSoilHealthEstimates(d);
  lastData=d;
}

// ============================================================
// SENSOR HEALTH
// ============================================================
function updateSensorHealth(d){
  const allFail=d.safeMode||false;
  const s1f=allFail||(fv(d.sm1)<=0&&fv(d.csmi)<=0);
  const s2f=allFail||(fv(d.sm2)<=0&&fv(d.csmi)<=0);
  const s3f=allFail||(fv(d.sm3)<=0&&fv(d.csmi)<=0);
  const items=[
    {id:'sh_sm1',name:'SM1 (15cm)',ok:!s1f,fb:false},
    {id:'sh_sm2',name:'SM2 (30cm)',ok:!s2f,fb:false},
    {id:'sh_sm3',name:'SM3 (45cm)',ok:!s3f,fb:false},
    {id:'sh_dht',name:'DHT22',ok:!d.dhtFallback,fb:d.dhtFallback},
    {id:'sh_bmp',name:'BMP280',ok:!d.bmpFallback,fb:d.bmpFallback},
    {id:'sh_flow',name:'YF-S201',ok:!d.pipelineFault,fb:false},
    {id:'sh_lora',name:'LoRa SX1278',ok:true,fb:false}
  ];
  items.forEach(s=>{
    const el=document.getElementById(s.id); if(!el) return;
    if(s.fb) el.innerHTML=`<span class="sh-dot warn"></span><span class="sh-name">${s.name}</span><span class="sh-stat warn">OWM Fallback</span>`;
    else el.innerHTML=`<span class="sh-dot ${s.ok?'ok':'fail'}"></span><span class="sh-name">${s.name}</span><span class="sh-stat ${s.ok?'ok':'fail'}">${s.ok?'OK':'FAULT'}</span>`;
  });
}

// ============================================================
// HELPERS
// ============================================================
function fv(v,def=0){return isNaN(parseFloat(v))?def:parseFloat(v);}
function setText(id,v){const e=document.getElementById(id);if(e)e.textContent=v;}
function setDisplay(id,d){const e=document.getElementById(id);if(e)e.style.display=d;}
function setEl(id,fn){const e=document.getElementById(id);if(e)fn(e);}
function silentFill(id,v){const e=document.getElementById(id);if(e)e.value=v;}
function setBarHeight(id,pct){const el=document.getElementById(id);if(!el)return;el.style.height=Math.max(2,Math.min(100,pct))+'%';}
function showAlert(msg){const b=document.getElementById('alertBar');if(b){b.style.display='block';b.innerText=msg;}}
function showSavedBadge(){const b=document.getElementById('configSavedBadge');if(b){b.style.display='inline-block';setTimeout(()=>b.style.display='none',3000);}}
function updateLastUpdateTime(){setText('lastUpdate','Updated '+new Date().toLocaleTimeString());}
function updateLiveAreaBanner(area_m2){const el=document.getElementById('liveArea');if(el)el.innerHTML=area_m2.toFixed(2)+' m\u00b2 ('+( area_m2/BIGHA_TO_M2).toFixed(4)+' Bigha)';}

function updatePreviewCard(cropIdx,area_m2){
  const crop=CROP_DATA[cropIdx]||CROP_DATA[0];
  const need=crop.delta*area_m2,bigha=area_m2/BIGHA_TO_M2;
  setText('prevDelta',crop.delta+' mm'); setText('prevArea',area_m2.toFixed(2)+' m\u00b2');
  setText('prevBigha',bigha.toFixed(6)+' Bigha'); setText('prevNeed',need.toFixed(1)+' L');
  setText('prevFC',crop.fc+'%'); setText('prevPWP',crop.pwp+'%');
}

function onCropChange(val){localConfig.crop=parseInt(val);updatePreviewCard(localConfig.crop,localConfig.plotArea_m2);}
function onM2Input(val){
  if(updatingM2)return;
  const m2=parseFloat(val); if(isNaN(m2))return;
  localConfig.plotArea_m2=m2; localConfig.plotArea_bigha=m2/BIGHA_TO_M2;
  updatingBigha=true; silentFill('plotAreaBigha',localConfig.plotArea_bigha.toFixed(6)); updatingBigha=false;
  updatePreviewCard(localConfig.crop,m2);
}
function onBighaInput(val){
  if(updatingBigha)return;
  const bigha=parseFloat(val); if(isNaN(bigha))return;
  const m2=bigha*BIGHA_TO_M2; localConfig.plotArea_m2=m2; localConfig.plotArea_bigha=bigha;
  updatingM2=true; silentFill('plotAreaM2',m2.toFixed(2)); updatingM2=false;
  updatePreviewCard(localConfig.crop,m2);
}
function onWeatherLocationChange(val){
  selectedWeatherLocation=val; localConfig.weatherLocation=val;
  const loc=WEATHER_LOCATIONS[val];
  if(loc){setText('weatherLocationInfo','\ud83d\udccd Lat: '+loc.lat+'\u00b0N  |  Lon: '+loc.lon+'\u00b0E  |  Alt: '+loc.alt+' m');setText('weatherLocBanner',loc.label);fetchOWMDirect();}
}

function addHistoryEntry(entry){
  irrigHistory.unshift(entry); if(irrigHistory.length>MAX_HISTORY)irrigHistory.pop();
  try{localStorage.setItem('tscric_history',JSON.stringify(irrigHistory));}catch(e){}
  renderHistory();
}
function loadHistory(){try{const s=localStorage.getItem('tscric_history');if(s)irrigHistory=JSON.parse(s);renderHistory();}catch(e){}}
function renderHistory(){
  const tbody=document.getElementById('historyBody'); if(!tbody)return;
  if(!irrigHistory.length){tbody.innerHTML='<tr><td colspan="5" style="text-align:center;color:#8b949e">No events yet</td></tr>';return;}
  tbody.innerHTML=irrigHistory.map(e=>`<tr><td>${e.time}</td><td>${e.csmi}%</td><td>${e.ai}</td><td>${e.dose} L</td><td><span class="badge badge-${e.reason==='Manual'?'manual':e.reason==='Adaptive'?'tpr':'auto'}">${e.reason}</span></td></tr>`).join('');
}

function connectionWatchdog(){
  const stale=(Date.now()-lastDataTime)/1000;
  if(lastDataTime>0&&stale>60){
    isConnected=false; setConnectionStatus('offline'); setDisplay('offlineBanner','block');
    setText('offlineBannerMsg','\u26a0\ufe0f No data for '+Math.round(stale)+'s \u2014 Device may be offline');
    if(stale>300) addAlert('warning','\u26a0\ufe0f Long Offline Period','No sensor data for '+Math.round(stale/60)+' minutes. Device offline or hotspot-only mode.',false,'alert_watchdog');
  }
}
function setConnectionStatus(status){
  const text=document.getElementById('connStatus'),dot=document.getElementById('connDot');
  if(!text)return;
  const map={online:{t:'\ud83d\udfe2 Live',c:'status-dot online'},offline:{t:'\ud83d\udfe1 Offline',c:'status-dot offline'},error:{t:'\ud83d\udd34 Error',c:'status-dot error'}};
  const s=map[status]||map.error; text.innerText=s.t; if(dot)dot.className=s.c;
}

// ============================================================
// OWM DIRECT
// ============================================================
async function fetchOWMDirect(){
  const loc=WEATHER_LOCATIONS[selectedWeatherLocation]||WEATHER_LOCATIONS.bhopal;
  const wUrl='https://api.openweathermap.org/data/2.5/weather?lat='+loc.lat+'&lon='+loc.lon+'&appid='+OWM_DIRECT_KEY+'&units=metric';
  const fUrl='https://api.openweathermap.org/data/2.5/forecast?lat='+loc.lat+'&lon='+loc.lon+'&appid='+OWM_DIRECT_KEY+'&units=metric&cnt=4';
  try{
    const [r1,r2]=await Promise.all([fetch(wUrl),fetch(fUrl)]);
    if(!r1.ok)return;
    const j=await r1.json(); const jf=r2.ok?await r2.json():null;
    let rainProb=0; if(jf&&jf.list) jf.list.forEach(s=>{if(s.pop!==undefined&&s.pop*100>rainProb)rainProb=s.pop*100;});
    owmDirectData={owm_temp:j.main?j.main.temp:null,owm_humidity:j.main?j.main.humidity:null,owm_pressure:j.main?j.main.pressure:null,owm_rain_mm:j.rain?(j.rain['1h']||j.rain['3h']||0):0,owm_rain_prob:rainProb,owm_valid:true};
    setText('owmTemp',  owmDirectData.owm_temp!==null?owmDirectData.owm_temp.toFixed(1)+' \u00b0C':'--');
    setText('owmHumidity',owmDirectData.owm_humidity!==null?owmDirectData.owm_humidity.toFixed(0)+' %':'--');
    setText('owmPressure', owmDirectData.owm_pressure!==null?owmDirectData.owm_pressure.toFixed(1)+' hPa':'--');
    setText('owmRain',   owmDirectData.owm_rain_mm>0?owmDirectData.owm_rain_mm.toFixed(2)+' mm':'0.00 mm');
    setText('owmRainfall',owmDirectData.owm_rain_mm>0?owmDirectData.owm_rain_mm.toFixed(2)+' mm':'0.00 mm');
    setText('owmPressure2','OWM: '+(owmDirectData.owm_pressure!==null?owmDirectData.owm_pressure.toFixed(1)+' hPa':'--'));
    const el=document.getElementById('owmStatus'); if(el){el.textContent='\ud83d\udfe2 OWM Live';el.className='owm-status owm-live';}
    if(!lastData){
      setText('rainVal',rainProb.toFixed(0)); setText('rainProbVal',rainProb.toFixed(0)+'%');
      const bar=document.getElementById('rainProbBar');
      if(bar){bar.style.width=(rainProb>0?rainProb:2)+'%';bar.style.background=rainProb>75?'#f85149':rainProb>35?'#f0a500':'#2ea043';}
      setText('rainCategory',rainProb<20?'\u2600\ufe0f Clear':rainProb<40?'\u26c5 Possible':rainProb<70?'\ud83c\udf26\ufe0f Likely':'\ud83c\udf27\ufe0f Rain Expected');
    }
    if(rainProb>80) addAlert('info','\ud83c\udf27\ufe0f Heavy Rain Forecast','Rain probability '+rainProb.toFixed(0)+'%. Irrigation will be suppressed automatically.',true,'alert_heavyrain');
  }catch(e){console.warn('OWM fetch failed:',e.message);}
}
// ============================================================
// v4.0 — SMART ALERT ENGINE
// ============================================================
function addAlert(severity,title,message,autoDismiss,id){
  const alertId=id||('alert_'+(++alertIdCounter));
  if(alertList_data.some(a=>a.id===alertId))return;
  alertList_data.unshift({id:alertId,severity,title,message,time:new Date().toLocaleTimeString(),autoDismiss});
  if(alertList_data.length>30)alertList_data.pop();
  renderAlertCenter();
  showToast(severity,title,message,autoDismiss?6000:0);
}

function dismissAlert(alertId){
  alertList_data=alertList_data.filter(a=>a.id!==alertId);
  renderAlertCenter();
}

function clearAllAlerts(){
  alertList_data=alertList_data.filter(a=>!a.autoDismiss);
  renderAlertCenter();
}

function renderAlertCenter(){
  const listEl=document.getElementById('alertList');
  const countEl=document.getElementById('alertBadgeCount');
  if(!listEl)return;
  const critCount=alertList_data.filter(a=>a.severity==='critical').length;
  if(countEl){
    countEl.textContent=alertList_data.length;
    countEl.className='alert-badge-count'+(alertList_data.length===0?' zero':'');
    if(critCount>0)countEl.style.background='var(--red)';
    else if(alertList_data.length>0)countEl.style.background='var(--orange)';
    else countEl.style.background='';
  }
  if(!alertList_data.length){listEl.innerHTML='<div class="alert-empty">\u2705 No active alerts \u2014 all systems nominal</div>';return;}
  listEl.innerHTML=alertList_data.map(a=>`
    <div class="alert-item sev-${a.severity}">
      <span class="alert-sev-dot"></span>
      <div class="alert-item-body">
        <div class="alert-item-title">${a.title}</div>
        <div class="alert-item-msg">${a.message}</div>
        <div class="alert-item-time">${a.time}</div>
      </div>
      <button class="alert-item-dismiss" onclick="dismissAlert('${a.id}')" title="Dismiss">\u2715</button>
    </div>`).join('');
}

function showToast(severity,title,message,duration){
  const container=document.getElementById('toast-container'); if(!container)return;
  const toast=document.createElement('div');
  toast.className=`toast toast--${severity==='critical'?'critical':severity==='warning'?'warning':severity==='success'?'success':'info'}`;
  const icons={critical:'\ud83d\udea8',warning:'\u26a0\ufe0f',info:'\u2139\ufe0f',success:'\u2705'};
  const dur=duration||(severity==='critical'?0:5000);
  toast.innerHTML=`<span class="toast-icon">${icons[severity]||'\u2139\ufe0f'}</span><div class="toast-body"><div class="toast-title">${title}</div><div class="toast-msg">${message}</div></div><button class="toast-close" onclick="this.closest('.toast').remove()">\u2715</button>${dur>0?`<div class="toast-progress" style="animation-duration:${dur}ms;color:${severity==='critical'?'var(--red)':severity==='warning'?'var(--orange)':'var(--blue)'}"></div>`:''}`;
  container.appendChild(toast);
  if(dur>0)setTimeout(()=>{toast.classList.add('toast-exit');setTimeout(()=>toast.remove(),300);},dur);
}

function runAlertEngine(d,owmValid){
  const csmi=fv(d.csmi),flow=fv(d.flowRate),aiS=fv(d.aiScore),pumpOn=d.pump||false;

  if(csmi>0&&csmi<18){addAlert('critical','\ud83c\udf35 Critical Soil Moisture','CSMI '+csmi.toFixed(1)+'% \u2014 root zone severely dry. Immediate irrigation required.',false,'alert_lowsoil');}
  else if(csmi>0&&csmi<28){addAlert('warning','\u26a0\ufe0f Low Soil Moisture','CSMI '+csmi.toFixed(1)+'% below optimal. Schedule irrigation soon.',true,'alert_soil_warn');}
  else{alertList_data=alertList_data.filter(a=>a.id!=='alert_lowsoil'&&a.id!=='alert_soil_warn');renderAlertCenter();}

  if(csmi>80&&pumpOn) addAlert('warning','\ud83d\udca6 Overwatering Risk','Soil moisture '+csmi.toFixed(1)+'% with pump ON. Risk of deep percolation.',false,'alert_overwater');

  if(d.safeMode) addAlert('critical','\ud83d\udd34 All Soil Sensors Failed','Safe Mode activated \u2014 all 3 soil sensors offline. Check CD4051 MUX wiring immediately.',false,'alert_safemode');
  else{alertList_data=alertList_data.filter(a=>a.id!=='alert_safemode');renderAlertCenter();}

  if(d.pipelineFault) addAlert('critical','\ud83d\udeb0 Pipeline Fault','No flow detected while pump ON. Check for blockage, burst pipe, or empty tank.',false,'alert_pipeline');
  else{alertList_data=alertList_data.filter(a=>a.id!=='alert_pipeline');renderAlertCenter();}

  if(d.dhtFallback) addAlert('warning','\ud83c\udf21\ufe0f DHT22 Fault','Temperature/Humidity sensor failed. OWM fallback active.',true,'alert_dht');
  if(d.bmpFallback) addAlert('warning','\ud83c\udf00 BMP280 Fault','Pressure sensor failed. OWM fallback active.',true,'alert_bmp');

  if(d.offlineMode&&fv(d.offlineLogCount)>=40)
    addAlert('warning','\ud83d\udce1 EEPROM Near Full',fv(d.offlineLogCount)+' offline events pending. Buffer approaching 50-event limit.',true,'alert_eeprom');

  if(aiS>100) addAlert('warning','\ud83e\udd16 High AI Score','AI Score '+aiS.toFixed(1)+'/120 \u2014 extreme irrigation urgency.',true,'alert_hiai');

  if(!pumpOn&&flow>0.5){addAlert('critical','\ud83d\udca7 Flow Detected \u2014 Pump OFF','Flow '+flow.toFixed(2)+' L/min detected while pump OFF. Possible leakage or pipe burst!',false,'alert_flow_leak');}
  else{alertList_data=alertList_data.filter(a=>a.id!=='alert_flow_leak');renderAlertCenter();}
}

// ============================================================
// v4.0 — AI EXPLAINABILITY ENGINE
// ============================================================
function updateExplainabilityEngine(d,owmValid){
  const explainBody=document.getElementById('explainBody');
  const decisionText=document.getElementById('decisionText');
  if(!explainBody||!d)return;
  const csmi=fv(d.csmi),sm1=fv(d.sm1),sm2=fv(d.sm2),sm3=fv(d.sm3);
  const aiScore=fv(d.aiScore),rainProb=fv(d.rainProb),eto=fv(d.eto),flow=fv(d.flowRate),pumpOn=d.pump||false;
  const crop=CROP_DATA[localConfig.crop];
  const cards=[];

  // Soil analysis
  if(csmi<20) cards.push({type:'alert',icon:'\ud83c\udf35',title:'Critical Root-Zone Depletion',text:`CSMI ${csmi.toFixed(1)}% \u2014 deep zone (${sm3.toFixed(1)}% at 45cm) below Permanent Wilting Point. Immediate irrigation required to prevent permanent crop damage.`,badge:'CRITICAL',badgeType:'alert'});
  else if(csmi<35) cards.push({type:'warn',icon:'\u26a0\ufe0f',title:'Root-Zone Below Field Capacity',text:`CSMI ${csmi.toFixed(1)}% \u2014 SM1:${sm1.toFixed(1)}%, SM2:${sm2.toFixed(1)}%, SM3:${sm3.toFixed(1)}%. Approaching lower threshold. Plan irrigation within 2\u20134 hours.`,badge:'DRY',badgeType:'warn'});
  else if(csmi>70) cards.push({type:'info',icon:'\ud83d\udca6',title:'Root-Zone Near Field Capacity',text:`CSMI ${csmi.toFixed(1)}% \u2014 high moisture across all depths. Deep sensor (${sm3.toFixed(1)}%) shows good retention. No irrigation needed; monitor for deep percolation.`,badge:'WET',badgeType:'info'});
  else cards.push({type:'good',icon:'\u2705',title:'Optimal Root-Zone Moisture',text:`CSMI ${csmi.toFixed(1)}% in optimal range \u2014 SM1:${sm1.toFixed(1)}%, SM2:${sm2.toFixed(1)}%, SM3:${sm3.toFixed(1)}%. Crop water demand is being met.`,badge:'OPTIMAL',badgeType:'good'});

  // Depth profile
  const surfDiff=sm1-sm3;
  if(surfDiff>15) cards.push({type:'info',icon:'\ud83c\udf0a',title:'Surface Wetter Than Deep Zone',text:`Surface (${sm1.toFixed(1)}%) is ${surfDiff.toFixed(1)}% wetter than deep zone (${sm3.toFixed(1)}%). Infiltration front moving downward. Recent irrigation or rainfall detected.`,badge:'INFILTRATING',badgeType:'info'});
  else if(surfDiff<-10) cards.push({type:'warn',icon:'\ud83c\udf31',title:'Deep Zone Retaining More Moisture',text:`Deep zone (${sm3.toFixed(1)}%) holds more moisture than surface (${sm1.toFixed(1)}%). Surface evaporation active. Consider mulching to reduce moisture loss.`,badge:'EVAP LOSS',badgeType:'warn'});

  // Rain suppression
  if(rainProb>75) cards.push({type:'info',icon:'\ud83c\udf27\ufe0f',title:'Irrigation Suppressed \u2014 High Rain Probability',text:`Rain probability ${rainProb.toFixed(0)}% (threshold: 75%). Irrigation auto-delayed. Expected rainfall will contribute to root-zone moisture budget.`,badge:'RAIN DELAY',badgeType:'info'});
  else if(rainProb>35) cards.push({type:'warn',icon:'\u26c5',title:'Moderate Rain Probability \u2014 Monitoring',text:`Rain probability ${rainProb.toFixed(0)}%. System monitoring. If rain occurs, irrigation cancelled. Otherwise, normal scheduling resumes.`,badge:'MONITORING',badgeType:'warn'});

  // ETo
  if(eto>6) cards.push({type:'warn',icon:'\u2600\ufe0f',title:'High Evapotranspiration Demand',text:`ETo ${eto.toFixed(2)} mm/day indicates high atmospheric water demand. Irrigation frequency should increase to compensate for accelerated soil moisture depletion.`,badge:'HIGH ETo',badgeType:'warn'});

  // Flow
  if(pumpOn&&flow<0.5) cards.push({type:'alert',icon:'\ud83d\udeb0',title:'Low Flow During Active Pump',text:`Pump ON but flow only ${flow.toFixed(2)} L/min. Possible pipe blockage, air lock, empty tank, or pump failure. Check pipeline immediately.`,badge:'FLOW FAULT',badgeType:'alert'});
  else if(pumpOn&&flow>0) cards.push({type:'good',icon:'\u2705',title:'Water Delivery Confirmed',text:`Pump ON \u2014 flow confirmed at ${flow.toFixed(2)} L/min. Water reaching field. Monitor soil sensors for root-zone response.`,badge:'DELIVERING',badgeType:'good'});

  // AI score
  if(aiScore>=65) cards.push({type:'warn',icon:'\ud83e\udd16',title:`AI Score ${aiScore.toFixed(1)}/120 \u2014 Irrigation Triggered`,text:`Score crossed 65-point threshold. Integrates CSMI (${csmi.toFixed(1)}%), moisture velocity (SMV), temporal pattern (TPR), and ETo demand. All conditions satisfied.`,badge:'TRIGGERED',badgeType:'warn'});
  else cards.push({type:'info',icon:'\ud83e\udd16',title:`AI Score ${aiScore.toFixed(1)}/120 \u2014 Monitoring`,text:`Score is ${(65-aiScore).toFixed(0)} points below trigger. System monitoring depletion rate (SMV) and temporal pattern (TPR: ${fv(d.tprScore).toFixed(3)}) until threshold crossed.`,badge:'MONITORING',badgeType:'info'});

  explainBody.innerHTML=cards.map(c=>`<div class="explain-card explain-${c.type}"><span class="explain-icon">${c.icon}</span><div class="explain-body"><div class="explain-title">${c.title}</div><div class="explain-text">${c.text}</div></div><span class="explain-badge ${c.badgeType}">${c.badge}</span></div>`).join('');

  if(decisionText){
    let dec='';
    if(d.safeMode) dec='<strong style="color:var(--red)">IRRIGATION SUSPENDED \u2014 SAFE MODE:</strong> All soil sensors offline. Check sensor wiring immediately.';
    else if(rainProb>75) dec=`<strong style="color:var(--rain-blue)">IRRIGATION DELAYED \u2014 RAIN EXPECTED:</strong> ${rainProb.toFixed(0)}% rain probability. System will resume after rain event.`;
    else if(csmi<25&&aiScore>=65) dec=`<strong style="color:var(--red)">IRRIGATION TRIGGERED:</strong> CSMI ${csmi.toFixed(1)}% below PWP AND AI Score ${aiScore.toFixed(1)} above 65. Pulse irrigation active (30s ON / 2min OFF). Flow sensor monitoring delivery.`;
    else if(csmi<35) dec=`<strong style="color:var(--orange)">IRRIGATION PENDING:</strong> CSMI ${csmi.toFixed(1)}% approaching trigger. AI Score ${aiScore.toFixed(1)}/65 required. Monitoring moisture depletion rate.`;
    else if(csmi>70) dec=`<strong style="color:var(--blue)">NO IRRIGATION NEEDED:</strong> Root-zone ${csmi.toFixed(1)}% above optimal. Pump will not activate until CSMI drops below stage threshold.`;
    else dec=`<strong style="color:var(--green-light)">MONITORING \u2014 OPTIMAL:</strong> CSMI ${csmi.toFixed(1)}% in optimal range for ${CROP_DATA[localConfig.crop].name}. AI Score ${aiScore.toFixed(1)}/120. Standard monitoring cycle active (10s interval).`;
    decisionText.innerHTML=dec;
  }
}

// ============================================================
// v4.0 — FAULT DIAGNOSTICS
// ============================================================
function updateFaultDiagnostics(d){
  const pumpOn=d.pump||false,flow=fv(d.flowRate);
  lastFlowRate=flow;
  const expFlow=5;

  // Leakage: flow when pump OFF
  const leakScore=(!pumpOn&&flow>0.3)?Math.min(100,flow*30):0;
  updateFaultCard('fd-leakage',leakScore,leakScore>50?'alert':leakScore>10?'warn':'ok',leakScore>50?'\ud83d\udea8 LEAKAGE DETECTED!':leakScore>10?'\u26a0\ufe0f Possible Leakage':'OK \u2014 Normal Flow',leakScore.toFixed(0)+'/100');

  // Dry-run: pump ON, no flow
  const dryScore=(pumpOn&&flow<0.3)?80:0;
  updateFaultCard('fd-dryrun',dryScore,dryScore>60?'alert':'ok',dryScore>60?'\ud83d\udd34 DRY-RUN RISK!':'OK \u2014 No Dry-Run',dryScore>60?'HIGH':'Low');

  // Blockage: low flow during pump
  const blockScore=(pumpOn&&flow>0&&flow<expFlow*0.4)?Math.round((1-flow/(expFlow*0.4))*100):0;
  updateFaultCard('fd-blockage',blockScore,blockScore>60?'alert':blockScore>30?'warn':'ok',blockScore>60?'\ud83d\udeab BLOCKAGE DETECTED':blockScore>30?'\u26a0\ufe0f Reduced Flow':'OK \u2014 Flow Normal',blockScore.toFixed(0)+'%');

  // Tampering: high flow when pump OFF
  const tamperScore=(flow>expFlow*2&&!pumpOn)?85:(!pumpOn&&flow>0.1?40:0);
  updateFaultCard('fd-theft',tamperScore,tamperScore>70?'alert':tamperScore>30?'warn':'ok',tamperScore>70?'\u26a0\ufe0f ABNORMAL FLOW!':tamperScore>30?'\u26a0\ufe0f Unusual Reading':'OK \u2014 No Anomaly',tamperScore>30?flow.toFixed(2)+' L/min unexpected':'None');
}

function updateFaultCard(id,score,state,statusText,detail){
  const card=document.getElementById(id);
  const sEl=document.getElementById(id+'-status');
  const bEl=document.getElementById(id+'-bar');
  const dEl=document.getElementById(id+'-score');
  if(!card)return;
  const colors={ok:'var(--green)',warn:'var(--orange)',alert:'var(--red)'};
  card.className='fault-card fault-'+state;
  if(sEl){sEl.textContent=statusText;sEl.className='fault-card-status '+state;}
  if(bEl){bEl.style.width=Math.min(100,score)+'%';bEl.style.background=colors[state];}
  if(dEl)dEl.textContent=detail;
}

// ============================================================
// v4.0 — TIPPING BUCKET RAINFALL
// ============================================================
function updateTippingBucketPanel(d){
  const tipMM=fv(d.tipBucket_mm),tipPulse=fv(d.tipBucket_pulses)||Math.round(tipMM/0.2);
  const rainMM=fv(d.owm_rain_mm)||tipMM;
  if(tipMM>tipAccum_mm)tipAccum_mm=tipMM;
  setText('tipPulseCount',tipPulse.toFixed(0)); setText('tipAccumMM',tipAccum_mm.toFixed(2));
  setText('rainIntensityInner',rainMM.toFixed(1)+' mm/h');
  const gaugeEl=document.getElementById('rainIntensityGauge');
  if(gaugeEl){const p=Math.min(100,(rainMM/25)*100);gaugeEl.style.background=`conic-gradient(var(--rain-blue) ${p*3.6}deg, var(--bg-tertiary) 0deg)`;}
  const S=(25400/75)-254,Ia=0.2*S;
  const runoff=tipAccum_mm>Ia?Math.pow(tipAccum_mm-Ia,2)/(tipAccum_mm-Ia+S):0;
  setText('runoffEstMM',runoff.toFixed(2));
  const eff=tipAccum_mm>0?Math.round(((tipAccum_mm-runoff)/tipAccum_mm)*100):0;
  setText('effectiveRainPct',eff.toString()); setEl('rainEffBar',el=>el.style.width=eff+'%');
  if(tipMM>0||(owmDirectData&&owmDirectData.owm_rain_mm>0))lastRainEvent=Date.now();
  if(lastRainEvent){setText('dryDaysCount',((Date.now()-lastRainEvent)/86400000).toFixed(0));}
  else setText('dryDaysCount','>7');
}

function checkRainfallIntelligence(){
  if(!lastData)return;
  const tipMM=fv(lastData.tipBucket_mm);
  if(tipMM>20)addAlert('info','\ud83c\udf27\ufe0f Significant Rainfall','Tipping bucket recorded '+tipMM.toFixed(1)+' mm. Irrigation suppressed. Water budget updated.',true,'alert_rain_event');
}

// ============================================================
// v4.0 — SOIL HEALTH (REAL HARDWARE ONLY — no fake estimates)
// ============================================================
function updateSoilHealthEstimates(d){
  const data=d||lastData; if(!data)return;

  // ── STRICT HARDWARE DETECTION ──────────────────────────────
  // Only show real values if actual sensor data came from Firebase.
  // Firebase key present AND non-zero = hardware connected.
  // Missing key OR exactly 0 = hardware NOT connected → show "Not Connected"
  const hasSoilTemp = data.hasOwnProperty('soilTemp') && fv(data.soilTemp) !== 0;
  const hasEC       = data.hasOwnProperty('ecValue')  && fv(data.ecValue)  !== 0;
  const hasPH       = data.hasOwnProperty('phValue')  && fv(data.phValue)  !== 0;

  // Salinity is derived from EC — only show if EC hardware present
  const hasAll = hasSoilTemp && hasEC && hasPH;

  // ── Soil Temperature (DS18B20) ─────────────────────────────
  if(hasSoilTemp){
    const soilTemp=fv(data.soilTemp);
    setText('soilTempVal', soilTemp.toFixed(1));
    const tStat=soilTemp<5||soilTemp>40?'critical':soilTemp<10||soilTemp>35?'caution':'optimal';
    const tText={optimal:'\u2705 Optimal',caution:'\u26a0\ufe0f Caution',critical:'\ud83d\udd34 Critical'};
    setText('soilTempStatus', tText[tStat]);
    setEl('soilTempStatus', el=>el.className='soil-health-status '+tStat);
    setEl('soilTempBar', el=>{ el.style.width=Math.min(100,(soilTemp/50)*100)+'%'; el.style.background='var(--orange)'; });
  } else {
    // Hardware not connected — show clearly
    setText('soilTempVal', '--');
    setText('soilTempStatus', '\ud83d\udd0c Not Connected');
    setEl('soilTempStatus', el=>el.className='soil-health-status disconnected');
    setEl('soilTempBar', el=>{ el.style.width='0%'; });
  }

  // ── EC Sensor ──────────────────────────────────────────────
  if(hasEC){
    const ec=fv(data.ecValue);
    setText('ecVal', ec.toFixed(2));
    const eStat=ec<0.5?'caution':ec>4?'critical':'optimal';
    const eText={optimal:'\u2705 Optimal',caution:'\u26a0\ufe0f Caution',critical:'\ud83d\udd34 Critical'};
    setText('ecStatus', eText[eStat]);
    setEl('ecStatus', el=>el.className='soil-health-status '+eStat);
    setEl('ecBar', el=>{ el.style.width=Math.min(100,(ec/6)*100)+'%'; el.style.background='var(--cyan)'; });
    if(eStat==='critical') addAlert('warning','\u26a1 High Soil Salinity','EC '+ec.toFixed(2)+' mS/cm — high salinity. Reduce fertilizer and increase leaching irrigation.',true,'alert_ec');
    // Salinity from real EC
    const salinity=ec*640;
    setText('salinityVal', salinity.toFixed(0));
    const sStat=salinity>1500?'critical':salinity>800?'caution':'optimal';
    const sText={optimal:'\u2705 Optimal',caution:'\u26a0\ufe0f Caution',critical:'\ud83d\udd34 Critical'};
    setText('salinityStatus', sText[sStat]);
    setEl('salinityStatus', el=>el.className='soil-health-status '+sStat);
    setEl('salinityBar', el=>{ el.style.width=Math.min(100,(salinity/2000)*100)+'%'; el.style.background='var(--amber)'; });
  } else {
    setText('ecVal', '--');
    setText('ecStatus', '\ud83d\udd0c Not Connected');
    setEl('ecStatus', el=>el.className='soil-health-status disconnected');
    setEl('ecBar', el=>{ el.style.width='0%'; });
    setText('salinityVal', '--');
    setText('salinityStatus', '\ud83d\udd0c Not Connected');
    setEl('salinityStatus', el=>el.className='soil-health-status disconnected');
    setEl('salinityBar', el=>{ el.style.width='0%'; });
  }

  // ── pH Sensor ──────────────────────────────────────────────
  if(hasPH){
    const ph=fv(data.phValue);
    setText('phVal', ph.toFixed(1));
    const pStat=ph<5.5||ph>8.0?'critical':ph<6.0||ph>7.5?'caution':'optimal';
    const pText={optimal:'\u2705 Optimal',caution:'\u26a0\ufe0f Caution',critical:'\ud83d\udd34 Critical'};
    setText('phStatus', pText[pStat]);
    setEl('phStatus', el=>el.className='soil-health-status '+pStat);
    setEl('phBar', el=>{ el.style.width=Math.min(100,(ph/14)*100)+'%'; el.style.background='var(--violet)'; });
    if(pStat==='critical') addAlert('warning','\ud83e\uddea Soil pH Critical','pH '+ph.toFixed(1)+' — outside optimal range (6.0–7.5). Crop nutrient uptake impaired.',true,'alert_ph');
  } else {
    setText('phVal', '--');
    setText('phStatus', '\ud83d\udd0c Not Connected');
    setEl('phStatus', el=>el.className='soil-health-status disconnected');
    setEl('phBar', el=>{ el.style.width='0%'; });
  }
}

// ============================================================
// v4.0 — LoRa DIAGNOSTICS (real hardware values only)
// ============================================================
function updateLoRaDiagnostics(d){
  const data=d||lastData;

  // ── STRICT HARDWARE DETECTION ──────────────────────────────
  // loraPackets comes from firmware. If it's missing from Firebase
  // or is 0, the LoRa hardware has not sent any packets yet.
  const hasLoRaData = data && data.hasOwnProperty('loraPackets') && fv(data.loraPackets) > 0;
  const hasRSSI     = data && data.hasOwnProperty('loraRSSI')    && fv(data.loraRSSI) !== 0;
  const hasSNR      = data && data.hasOwnProperty('loraSNR')     && fv(data.loraSNR)  !== 0;

  if(hasLoRaData){
    // Real firmware data present — update counter
    loraPacketCount = fv(data.loraPackets);
    loraTxTimestamp = Date.now();
    setText('loraPacketsSent', loraPacketCount.toString());
    setText('loraTxAge', 'just now');
  } else {
    // No real LoRa hardware data — show clearly
    setText('loraPacketsSent', '--');
    setText('loraTxAge', 'No data');
  }

  // RSSI — only show if firmware sent real value
  if(hasRSSI){
    const rssi = fv(data.loraRSSI);
    setText('loraRSSI', rssi.toFixed(0)+' dBm');
    const sigQual  = rssi>-80?'Excellent':rssi>-100?'Good':rssi>-110?'Fair':'Weak';
    const sigColor = rssi>-80?'var(--green-light)':rssi>-100?'var(--teal)':rssi>-110?'var(--orange)':'var(--red)';
    setText('loraSignalQuality', 'Signal: '+sigQual);
    setEl('loraSignalQuality', el=>el.style.color=sigColor);
    const rssiPct = Math.max(0,Math.min(100,((rssi+120)/60)*100));
    setEl('loraRSSIBar', el=>el.style.width=rssiPct+'%');
  } else {
    setText('loraRSSI', '--');
    setText('loraSignalQuality', 'No RSSI data');
    setEl('loraSignalQuality', el=>el.style.color='var(--text-muted)');
    setEl('loraRSSIBar', el=>el.style.width='0%');
  }

  // SNR — only show if firmware sent real value
  if(hasSNR){
    setText('loraSNR', fv(data.loraSNR).toFixed(1)+' dB');
  } else {
    setText('loraSNR', '--');
  }

  // Network status badge
  const netEl = document.getElementById('loraNetStatus');
  if(netEl){
    const isActive = data && (data.offlineMode || data.wifiMode==='Offline');
    if(!hasLoRaData){
      netEl.textContent = '\u25cb Hardware Not Connected';
      netEl.style.color = 'var(--text-muted)';
    } else if(isActive){
      netEl.textContent = '\u25cf Fallback Active';
      netEl.style.color = 'var(--orange)';
    } else {
      netEl.textContent = '\u25cf Standby';
      netEl.style.color = '#b08eff';
    }
  }
}
// ============================================================
// v4.0 — HISTORICAL CHARTS
// ============================================================
let currentChartTab='soilMoisture';

function switchChartTab(tabId,btn){
  currentChartTab=tabId;
  document.querySelectorAll('.chart-tab').forEach(t=>t.classList.remove('active'));
  document.querySelectorAll('.chart-panel').forEach(p=>p.classList.remove('active'));
  if(btn)btn.classList.add('active');
  const panel=document.getElementById('panel-'+tabId);
  if(panel)panel.classList.add('active');
}

function appendChartData(d,owmOK){
  if(!chartsReady||!window.Chart)return;
  const lbl=new Date().toLocaleTimeString([],{hour:'2-digit',minute:'2-digit'});
  const B=chartBuffers;
  B.labels.push(lbl); B.sm1.push(fv(d.sm1)); B.sm2.push(fv(d.sm2)); B.sm3.push(fv(d.sm3)); B.csmi.push(fv(d.csmi));
  B.flow.push(fv(d.flowRate)); B.aiScore.push(fv(d.aiScore)); B.eto.push(fv(d.eto));
  B.rainfall.push(fv(d.tipBucket_mm)||(owmOK?fv(d.owm_rain_mm):0));
  B.effectiveRain.push(fv(d.effectiveRain)); B.appliedL.push(fv(d.totalLitres));
  B.rainfallL.push(fv(d.rainfallContrib)); B.etoLoss.push(fv(d.eto)*(fv(d.plotArea_m2)||6)*0.001);
  B.temp.push(fv(d.temperature)); B.hum.push(fv(d.humidity));
  Object.keys(B).forEach(k=>{if(B[k].length>CHART_BUF)B[k].shift();});
  updateAllCharts();
  if(B.sm1.length>1){
    const avg=arr=>(arr.reduce((a,b)=>a+b,0)/arr.length).toFixed(1);
    setText('cstat-sm1-avg',avg(B.sm1)+'%'); setText('cstat-sm2-avg',avg(B.sm2)+'%');
    setText('cstat-sm3-avg',avg(B.sm3)+'%'); setText('cstat-csmi-avg',avg(B.csmi)+'%');
    setText('cstat-ai-max',Math.max(...B.aiScore).toFixed(1));
    setText('cstat-ai-avg',avg(B.aiScore));
    setText('cstat-ai-triggers',B.aiScore.filter(s=>s>=65).length.toString());
  }
}

function initAllCharts(){
  if(!window.Chart)return;
  Chart.defaults.color='#8b949e'; Chart.defaults.borderColor='#30363d';
  const co={
    responsive:true,maintainAspectRatio:false,animation:{duration:300},
    plugins:{legend:{display:false},tooltip:{backgroundColor:'#161b22',borderColor:'#30363d',borderWidth:1,titleColor:'#e6edf3',bodyColor:'#8b949e'}},
    scales:{x:{grid:{color:'rgba(48,54,61,0.5)'},ticks:{color:'#8b949e',maxTicksLimit:8,font:{size:10}}},y:{grid:{color:'rgba(48,54,61,0.5)'},ticks:{color:'#8b949e',font:{size:10}}}}
  };
  const coLeg={...co,plugins:{...co.plugins,legend:{display:true,labels:{color:'#8b949e',boxWidth:10,font:{size:10}}}}};

  createChart('chart-soilMoisture',{type:'line',data:{labels:[],datasets:[
    {label:'SM1 15cm',data:[],borderColor:'#56d364',backgroundColor:'rgba(86,211,100,0.08)',tension:0.4,pointRadius:2},
    {label:'SM2 30cm',data:[],borderColor:'#58a6ff',backgroundColor:'rgba(88,166,255,0.08)',tension:0.4,pointRadius:2},
    {label:'SM3 45cm',data:[],borderColor:'#f0a500',backgroundColor:'rgba(240,165,0,0.08)',tension:0.4,pointRadius:2},
    {label:'CSMI',    data:[],borderColor:'#2dff80',backgroundColor:'rgba(45,255,128,0.1)',tension:0.4,borderWidth:2,pointRadius:2}
  ]},options:{...coLeg,scales:{...coLeg.scales,y:{...coLeg.scales.y,min:0,max:100,ticks:{...coLeg.scales.y.ticks,callback:v=>v+'%'}}}}});

  createChart('chart-irrigation',{type:'bar',data:{labels:[],datasets:[
    {label:'Applied (L)',data:[],backgroundColor:'rgba(31,111,235,0.6)',borderColor:'#1f6feb',borderWidth:1}
  ]},options:{...co}});

  createChart('chart-rainfall',{type:'bar',data:{labels:[],datasets:[
    {label:'Rainfall (mm)', data:[],backgroundColor:'rgba(88,166,255,0.6)',borderColor:'#58a6ff',borderWidth:1},
    {label:'Effective (mm)',data:[],backgroundColor:'rgba(46,160,67,0.5)',borderColor:'#56d364',borderWidth:1}
  ]},options:{...coLeg}});

  createChart('chart-eto',{type:'line',data:{labels:[],datasets:[
    {label:'ETo (mm/day)',    data:[],borderColor:'#f85149',backgroundColor:'rgba(248,81,73,0.08)',tension:0.4,pointRadius:2},
    {label:'Eff. Rain (mm)', data:[],borderColor:'#58a6ff',backgroundColor:'rgba(88,166,255,0.08)',tension:0.4,pointRadius:2}
  ]},options:{...coLeg}});

  createChart('chart-aiScore',{type:'line',data:{labels:[],datasets:[
    {label:'AI Score',data:[],borderColor:'#39d353',backgroundColor:'rgba(57,211,83,0.1)',tension:0.4,pointRadius:2,fill:true}
  ]},options:{...co,scales:{...co.scales,y:{...co.scales.y,min:0,max:120}}}});

  createChart('chart-flowRate',{type:'line',data:{labels:[],datasets:[
    {label:'Flow Rate (L/min)',data:[],borderColor:'#00d4ff',backgroundColor:'rgba(0,212,255,0.08)',tension:0.4,pointRadius:2}
  ]},options:{...co}});

  createChart('chart-waterBalance',{type:'bar',data:{labels:[],datasets:[
    {label:'Applied (L)', data:[],backgroundColor:'rgba(88,166,255,0.6)',borderColor:'#58a6ff',borderWidth:1},
    {label:'Rainfall (L)',data:[],backgroundColor:'rgba(46,160,67,0.5)',borderColor:'#56d364',borderWidth:1},
    {label:'ETo Loss (L)',data:[],backgroundColor:'rgba(248,81,73,0.4)',borderColor:'#f85149',borderWidth:1}
  ]},options:{...coLeg}});

  createChart('chart-envSensors',{type:'line',data:{labels:[],datasets:[
    {label:'Temp (\u00b0C)',    data:[],borderColor:'#f85149',backgroundColor:'rgba(248,81,73,0.08)',tension:0.4,pointRadius:2,yAxisID:'y'},
    {label:'Humidity (%)',data:[],borderColor:'#58a6ff',backgroundColor:'rgba(88,166,255,0.08)',tension:0.4,pointRadius:2,yAxisID:'y1'}
  ]},options:{...coLeg,scales:{x:co.scales.x,y:{grid:{color:'rgba(48,54,61,0.5)'},ticks:{color:'#f85149',font:{size:10}},position:'left'},y1:{grid:{color:'rgba(48,54,61,0.2)'},ticks:{color:'#58a6ff',font:{size:10}},position:'right',min:0,max:100}}}});

  chartsReady=true;
}

function createChart(id,config){
  const canvas=document.getElementById(id); if(!canvas)return;
  if(chartInstances[id]){chartInstances[id].destroy();}
  try{chartInstances[id]=new Chart(canvas,config);}catch(e){console.warn('Chart create failed:',id,e);}
}

function updateAllCharts(){
  if(!chartsReady||!window.Chart)return;
  const B=chartBuffers;
  updateChart('chart-soilMoisture',B.labels,[B.sm1,B.sm2,B.sm3,B.csmi]);
  updateChart('chart-irrigation',  B.labels,[B.appliedL]);
  updateChart('chart-rainfall',    B.labels,[B.rainfall,B.effectiveRain]);
  updateChart('chart-eto',         B.labels,[B.eto,B.effectiveRain]);
  updateChart('chart-aiScore',     B.labels,[B.aiScore]);
  updateChart('chart-flowRate',    B.labels,[B.flow]);
  updateChart('chart-waterBalance',B.labels,[B.appliedL,B.rainfallL,B.etoLoss]);
  updateChart('chart-envSensors',  B.labels,[B.temp,B.hum]);
}

function updateChart(id,labels,dataSets){
  const chart=chartInstances[id]; if(!chart)return;
  chart.data.labels=[...labels];
  dataSets.forEach((ds,i)=>{if(chart.data.datasets[i])chart.data.datasets[i].data=[...ds];});
  chart.update('none');
}
// ============================================================
// AI FARM ASSISTANT (original v3.0 fully preserved)
// ============================================================
let aiChatHistory=[], aiIsLoading=false, aiChatBooted=false;

function initAIChat(){
  const container=document.getElementById('aiChatMessages'); if(!container)return;
  container.innerHTML='';
  const offlineMode=lastData&&lastData.offlineMode;
  const welcomeMsg=offlineMode?
    '\ud83d\udce1 **Offline Mode Active**\n\nSystem autonomous mode mein chal raha hai. Local sensor data use kar raha hoon.\n\n**Poochh sakte ho:**\nMitti ki condition | Pump status | Water budget | Sensor health | Offline sync status':
    '\ud83c\udf3e **TSCRIC-LoRa AI Farm Assistant v4.0**\n\nNamaskar! Main aapke farm ka intelligent assistant hoon.\n\nMujhe pata hai:\n\u2022 **Live sensor data** \u2014 SM1/SM2/SM3, CSMI, temperature, humidity, pressure, flow\n\u2022 **AI score** \u2014 SMV, SMA, TPR, ETo components\n\u2022 **Water budget** \u2014 applied, rainfall, balance, efficiency\n\u2022 **Weather** \u2014 OWM forecast, rain probability, tipping bucket\n\u2022 **System** \u2014 pump, LoRa, offline mode, Firebase, sensors\n\n**50+ topics cover karta hoon** \u2014 Hindi ya English mein poochho!\n\nType \`help\` to see all topics, or use **Quick Ask** buttons above.\n\n\u26a0\ufe0f Advisory only \u2014 pump control seedha nahi karta.';
  appendAIMessage('model',welcomeMsg,true);
}

function buildFarmContext(){
  if(!lastData)return "No live sensor data available yet \u2014 waiting for Firebase connection.";
  const d=lastData, _fv=v=>isNaN(parseFloat(v))?0:parseFloat(v);
  const sh=[
    (!d.safeMode&&_fv(d.sm1)>0)?"SM1(15cm) OK":"SM1(15cm) FAULT",
    (!d.safeMode&&_fv(d.sm2)>0)?"SM2(30cm) OK":"SM2(30cm) FAULT",
    (!d.safeMode&&_fv(d.sm3)>0)?"SM3(45cm) OK":"SM3(45cm) FAULT",
    d.dhtFallback?"DHT22 FAULT [OWM fallback]":"DHT22 OK",
    d.bmpFallback?"BMP280 FAULT [OWM fallback]":"BMP280 OK",
    d.pipelineFault?"Flow/Pipeline FAULT":"Flow sensor OK"
  ].join(" | ");
  const rainSrc=_fv(d.tipBucket_mm)>0?`Tipping bucket: ${_fv(d.tipBucket_mm).toFixed(2)} mm`:_fv(d.owm_rain_mm)>0?`OWM API: ${_fv(d.owm_rain_mm).toFixed(2)} mm`:_fv(d.estimatedRain)>0?`Sensor estimate: ~${_fv(d.estimatedRain).toFixed(1)} mm`:"No rainfall detected";
  return [
    `Crop: ${d.crop||'Unknown'} | Stage: ${d.stage||'Unknown'} | GDD: ${_fv(d.gdd).toFixed(0)} \u00b0C\u00b7day`,
    `Plot: ${_fv(d.plotArea_m2).toFixed(2)} m\u00b2`,
    `SM1@15cm:${_fv(d.sm1).toFixed(1)}% | SM2@30cm:${_fv(d.sm2).toFixed(1)}% | SM3@45cm:${_fv(d.sm3).toFixed(1)}%`,
    `CSMI: ${_fv(d.csmi).toFixed(1)}%`,
    `Temp:${_fv(d.temperature).toFixed(1)}\u00b0C | Humidity:${_fv(d.humidity).toFixed(0)}% | Pressure:${_fv(d.pressure).toFixed(1)}hPa`,
    `ETo:${_fv(d.eto).toFixed(2)}mm/day`,
    `AI Score:${_fv(d.aiScore).toFixed(1)}/120 | SMV:${_fv(d.smv).toFixed(4)} | TPR:${_fv(d.tprScore).toFixed(3)}`,
    `Rain Prob:${_fv(d.rainProb).toFixed(0)}%`,
    rainSrc,
    `Effective Rain:${_fv(d.effectiveRain).toFixed(2)}mm`,
    `Flow:${_fv(d.flowRate).toFixed(2)}L/min | Total:${_fv(d.totalLitres).toFixed(1)}L`,
    `Pump:${d.pump?'ON':'OFF'} | Mode:${d.autoMode?'Auto':'Manual'} | Fault:${d.pipelineFault?'YES':'None'}`,
    `Required:${_fv(d.deltaRequired).toFixed(1)}L | Applied:${_fv(d.deltaApplied).toFixed(1)}L | Balance:${_fv(d.deltaBalance).toFixed(1)}L`,
    `Mode:${d.offlineMode?'OFFLINE':'ONLINE'} | SafeMode:${d.safeMode?'ACTIVE':'OK'}`,
    sh
  ].join("\n");
}

async function sendAIMessage(){
  const input=document.getElementById('aiUserInput'); if(!input)return;
  const text=input.value.trim(); if(!text||aiIsLoading)return;
  input.value=''; updateCharCount(0); autoResizeTextarea(input);
  appendAIMessage('user',text); await askGemini(text);
}

async function quickAsk(question){if(aiIsLoading)return;appendAIMessage('user',question);await askGemini(question);}

async function runAutoAnalysis(){
  if(aiIsLoading)return;
  appendAIMessage('user','\u26a1 Auto Farm Analysis requested');
  await askGemini("Please give me a full analysis of current farm conditions: soil moisture, irrigation recommendation, sensor health, rainfall, water balance, and any faults.");
}

async function askGemini(userQuestion){
  if(aiIsLoading)return;
  setAILoading(true); updateAIStatusBadge('thinking');
  const steps=buildThinkingSteps(userQuestion); let idx=0;
  const timer=setInterval(()=>{const b=document.getElementById('aiStatusBadge');if(b&&idx<steps.length){b.textContent='\u25ce '+steps[idx];idx++;}},400);
  await new Promise(r=>setTimeout(r,steps.length*420+300));
  clearInterval(timer);
  try{
    const reply=ruleBasedResponse(userQuestion);
    aiChatHistory.push({role:'user',parts:[{text:userQuestion}]});
    aiChatHistory.push({role:'model',parts:[{text:reply}]});
    appendAIMessage('model',reply);
    updateAIStatusBadge('ready');
  }catch(e){appendAIMessage('model','System error. Please try again.');}
  finally{setAILoading(false);}
}

function buildThinkingSteps(q){
  const q2=q.toLowerCase();
  const steps=['Sawaal samajh raha hoon...'];
  if(/temp|garmi|celsius|weather|mausam|dht|humidity|pressure|bmp/.test(q2)){
    steps.push('Temperature aur humidity data dekh raha hoon...');
    steps.push('ETo calculate kar raha hoon...');
  } else if(/pump|motor|start|band|relay|flow|paani aaya/.test(q2)){
    steps.push('Pump status check kar raha hoon...');
    steps.push('AI score aur flow rate evaluate kar raha hoon...');
  } else if(/baarish|rain|barish|rainfall|tipping|precipitation/.test(q2)){
    steps.push('OWM forecast dekh raha hoon...');
    steps.push('Tipping bucket aur rain probability check kar raha hoon...');
  } else if(/mitti|soil|moisture|naami|csmi|vwc|sm1|sm2|sm3|root zone/.test(q2)){
    steps.push('SM1, SM2, SM3 readings dekh raha hoon...');
    steps.push('CSMI weighted average calculate kar raha hoon...');
    steps.push('Root zone profile analyze kar raha hoon...');
  } else if(/sensor|fault|kharab|hardware|status/.test(q2)){
    steps.push('Sensor health flags check kar raha hoon...');
    steps.push('Fault conditions evaluate kar raha hoon...');
  } else if(/budget|balance|litre|water left|kitna paani bacha/.test(q2)){
    steps.push('Seasonal water budget calculate kar raha hoon...');
    steps.push('Rainfall contribution add kar raha hoon...');
  } else if(/ai score|score kya|algorithm|smv|sma|tpr/.test(q2)){
    steps.push('AI score components decompose kar raha hoon...');
    steps.push('SMV, SMA, TPR values check kar raha hoon...');
  } else if(/eto|evapotranspiration|evaporation|kc|crop coefficient/.test(q2)){
    steps.push('ETo calculate kar raha hoon (Hargreaves-Samani)...');
    steps.push('Crop coefficient (Kc) apply kar raha hoon...');
  } else if(/crop|fasal|stage|gdd|growing degree|phenology/.test(q2)){
    steps.push('Crop stage aur GDD check kar raha hoon...');
    steps.push('Stage-specific advice prepare kar raha hoon...');
  } else if(/fertilizer|khad|urea|dap|npk|nutrient/.test(q2)){
    steps.push('Current soil condition check kar raha hoon...');
    steps.push('Fertilizer schedule prepare kar raha hoon...');
  } else if(/pest|disease|fungus|kida|bimari|spray/.test(q2)){
    steps.push('Temperature aur humidity se disease risk assess kar raha hoon...');
    steps.push('Crop-specific pest advisory prepare kar raha hoon...');
  } else if(/leak|pipe|fault|blockage|tapka|paani beh/.test(q2)){
    steps.push('Flow sensor data aur pump state cross-check kar raha hoon...');
    steps.push('Anomaly score calculate kar raha hoon...');
  } else if(/offline|lora|hotspot|eeprom|sync|192\.168/.test(q2)){
    steps.push('Offline mode status check kar raha hoon...');
    steps.push('LoRa aur EEPROM data dekh raha hoon...');
  } else if(/drip|sprinkler|irrigation system|design|sinchai system/.test(q2)){
    steps.push('Crop ke liye best irrigation system identify kar raha hoon...');
    steps.push('System parameters calculate kar raha hoon...');
  } else if(/csmi kya|csmi algorithm|weighted|depth weight/.test(q2)){
    steps.push('CSMI formula breakdown kar raha hoon...');
    steps.push('Stage weights apply kar raha hoon...');
  } else if(/full analysis|complete|everything|sab batao|poora/.test(q2)){
    steps.push('Saare sensor data collect kar raha hoon...');
    steps.push('Soil moisture profile analyze kar raha hoon...');
    steps.push('Water budget calculate kar raha hoon...');
    steps.push('System health check kar raha hoon...');
  } else if(/help|topics|capabilities|kya puchh/.test(q2)){
    steps.push('Topic list prepare kar raha hoon...');
  } else {
    steps.push('Context samajh raha hoon...');
    steps.push('Sensor data se match kar raha hoon...');
  }
  steps.push('Jawab taiyaar kar raha hoon...');
  return steps;
}

function getSoilLevel(csmi){
  if(csmi>=65)return{level:'\ud83d\udca6 Wet (above FC)',color:'#58a6ff'};
  if(csmi>=45)return{level:'\u2705 Optimal',color:'#56d364'};
  if(csmi>=30)return{level:'\u26a0\ufe0f Moderate Dry',color:'#f0a500'};
  if(csmi>=15)return{level:'\ud83d\udd34 Dry',color:'#f85149'};
  return{level:'\ud83d\udca7 Critical Dry',color:'#ff0000'};
}
function getRainInfo(){
  const d=lastData, owm=owmDirectData;
  const prob=d?fv(d.rainProb):(owm?owm.owm_rain_prob:0);
  const mm=d?(fv(d.tipBucket_mm)||fv(d.owm_rain_mm)):(owm?owm.owm_rain_mm:0);
  return{prob,mm,src:d&&fv(d.tipBucket_mm)>0?'Tipping Bucket':'OWM'};
}
function getWaterCalc(){
  const d=lastData; if(!d)return null;
  const area=fv(d.plotArea_m2)||localConfig.plotArea_m2;
  const csmi=fv(d.csmi), eto=fv(d.eto)||3;
  const fc=CROP_DATA[localConfig.crop].fc;
  const deficit=Math.max(0,(fc-csmi)/100*300*area/1000);
  const eto_l=eto*area/1000;
  return{needed:(deficit+eto_l).toFixed(1),eto_l:eto_l.toFixed(1),deficit:deficit.toFixed(1)};
}

function ruleBasedResponse(question){
  const d=lastData, owm=owmDirectData;
  const q2=question.toLowerCase(), _fv=v=>isNaN(parseFloat(v))?0:parseFloat(v);
  const has=kw=>kw.some(k=>q2.includes(k));
  const crop=CROP_DATA[localConfig.crop];
  const csmi=d?_fv(d.csmi):0, temp=d?_fv(d.temperature):0;
  const eto=d?_fv(d.eto):0, score=d?_fv(d.aiScore):0;
  const ri=getRainInfo(), wc=getWaterCalc();

  // ── Irrigation timing intents ──────────────────────────────
  const intent=detectIrrigationIntent(q2,has,d,_fv);
  if(intent)return irrigationMasterResponse(intent,d,_fv,owm);

  // ── SOIL MOISTURE (deep analysis) ─────────────────────────
  if(has(['csmi','soil moisture','mitti','naami','sm1','sm2','sm3','moisture','soil condition','vwc','volumetric','root zone','rootzone','aaj mitti','mitti kya'])){
    if(!d)return '\ud83d\udce1 Sensor data nahi — Firebase connection check karo.';
    const sl=getSoilLevel(csmi);
    const sm1=_fv(d.sm1),sm2=_fv(d.sm2),sm3=_fv(d.sm3);
    const diff=sm1-sm3;
    const trend=diff>10?'\ud83d\udd3d Surface wetter than deep — moisture moving downward (infiltrating)':diff<-10?'\ud83d\udd3c Deep zone retaining more — surface evaporation active':'\u2194\ufe0f Uniform moisture across profile';
    const recommendation=csmi<20?'\ud83d\udea8 CRITICAL: Irrigate immediately — PWP reached!':csmi<30?'\u26a0\ufe0f Irrigate today — approaching stress threshold':csmi<45?'\ud83d\udca7 Plan irrigation within 24 hours':csmi<65?'\u2705 Moisture optimal — continue monitoring':'\ud83d\udca6 Soil wet — skip irrigation, check drainage';
    return `\ud83c\udf31 **Soil Moisture Deep Analysis**\n\n**3-Depth Profile:**\nSM1 @ 15cm (Shallow): **${sm1.toFixed(1)}%** ${sm1<25?'\ud83d\udd34':sm1<40?'\ud83d\udfe1':'\ud83d\udfe2'}\nSM2 @ 30cm (Mid-root): **${sm2.toFixed(1)}%** ${sm2<25?'\ud83d\udd34':sm2<40?'\ud83d\udfe1':'\ud83d\udfe2'}\nSM3 @ 45cm (Deep root): **${sm3.toFixed(1)}%** ${sm3<25?'\ud83d\udd34':sm3<40?'\ud83d\udfe1':'\ud83d\udfe2'}\n\n**CSMI (Weighted Average): ${csmi.toFixed(1)}%**\nCondition: ${sl.level}\n\nVWC1: ${_fv(d.vwc1).toFixed(3)} m\u00b3/m\u00b3 | VWC2: ${_fv(d.vwc2).toFixed(3)} | VWC3: ${_fv(d.vwc3).toFixed(3)}\n\n**Profile Trend:** ${trend}\n\n**Field Capacity:** ${crop.fc}% | **PWP:** ${crop.pwp}%\n**Available Water:** ${Math.max(0,csmi-crop.pwp).toFixed(1)}% (of ${(crop.fc-crop.pwp)}% TAW)\n\n\ud83d\udca1 **${recommendation}**`;
  }

  // ── CROP SPECIFIC ADVICE ───────────────────────────────────
  if(has(['crop','fasal','gehun','wheat','rice','dhan','maize','makka','cotton','kapas','soybean','chickpea','chana','mustard','sarson','sugarcane','ganna','kharif','rabi','crop stage'])){
    const cropNames=['Wheat (Gehun)','Rice (Dhan)','Maize (Makka)','Cotton (Kapas)','Soybean','Chickpea (Chana)','Mustard (Sarson)','Sugarcane (Ganna)'];
    const stageNames=['Germination','Vegetative','Reproductive','Maturity'];
    const criticalPeriods=['Tillering & Jointing','Flowering & Grain filling','Tasseling & Silk','Boll formation','Pod filling','Flowering','Flowering & Pod fill','Grand growth period'];
    const waterAdvice=[
      'Wheat: Total delta 450mm. Irrigate at crown root (21 DAS), tillering (45 DAS), jointing (65 DAS), heading (85 DAS), milking (100 DAS). Avoid waterlogging.',
      'Rice: Needs 1200mm total. Maintain 5cm standing water during vegetative. Drain 10 days before harvest. Alternate wet-dry saves 30% water.',
      'Maize: Critical at tasseling and silking (55-70 DAS). Delta 550mm. Severe stress at these stages causes blank cobs.',
      'Cotton: 750mm delta. Deep rooted — 45cm sensors critical. Stress at boll formation causes boll shedding.',
      'Soybean: 500mm total. Most sensitive at flowering and pod fill (R1-R6 stages). Avoid waterlogging.',
      'Chickpea: Drought tolerant — 350mm total. Pre-sowing irrigation important. Limit irrigation at pod fill.',
      'Mustard: 380mm total. 2-3 irrigations sufficient. Critical at branching and pod formation.',
      'Sugarcane: 1800mm — highest delta. Grand growth period (3-10 months) needs maximum water. Ratoon crop needs less.'
    ];
    return `\ud83c\udf3e **Crop Advisory: ${cropNames[localConfig.crop]}**\n\n**Current Stage:** ${stageNames[d?_fv(d.stage):0]} | **GDD:** ${d?_fv(d.gdd).toFixed(0):'--'} \u00b0C\u00b7day\n**Critical Period:** ${criticalPeriods[localConfig.crop]}\n\n**Water Management:**\n${waterAdvice[localConfig.crop]}\n\n**Current CSMI:** ${d?csmi.toFixed(1)+'%':' -- '}\n**Seasonal Delta (\u0394):** ${crop.delta} mm\n**Field Capacity:** ${crop.fc}% | **PWP:** ${crop.pwp}%\n\n\ud83d\udca1 ${d&&csmi<crop.pwp+5?'\u26a0\ufe0f Near wilting point \u2014 irrigate urgently!':d&&csmi>crop.fc-5?'\ud83d\udca6 Near field capacity \u2014 no irrigation needed.':'\u2705 Moisture within acceptable range for this crop.'}`;
  }

  // ── EVAPOTRANSPIRATION ─────────────────────────────────────
  if(has(['eto','evapotranspiration','evaporation','transpiration','water demand','etcrop','etc','kc','crop coefficient'])){
    if(!d)return '\ud83d\udce1 Sensor data nahi.';
    const kc=[0.7,1.05,0.8,0.85,0.85,0.75,0.75,1.0]; // Kc values per crop
    const etcrop=eto*kc[localConfig.crop];
    const dailyNeedL=etcrop*_fv(d.plotArea_m2)/1000;
    return `\u2600\ufe0f **Evapotranspiration (ETo) Analysis**\n\n**Reference ETo:** ${eto.toFixed(2)} mm/day\n**Crop Coefficient (Kc):** ${kc[localConfig.crop].toFixed(2)} for ${CROP_DATA[localConfig.crop].name}\n**Crop ET (ETc):** ${etcrop.toFixed(2)} mm/day\n\n**Daily Water Need:** ~${dailyNeedL.toFixed(1)} L (for ${_fv(d.plotArea_m2).toFixed(1)}m\u00b2 plot)\n\n**Temperature:** ${temp.toFixed(1)}\u00b0C | **Humidity:** ${_fv(d.humidity).toFixed(0)}%\n\n${eto>7?'\ud83d\udd25 Very high ETo \u2014 hot & dry conditions. Increase irrigation frequency.':eto>5?'\u2600\ufe0f High ETo \u2014 monitor CSMI every 4-6 hours.':eto>3?'\u2600\ufe0f Moderate ETo \u2014 normal irrigation schedule.':'\ud83c\udf27\ufe0f Low ETo \u2014 cool/humid conditions. Reduce irrigation.'}\n\n**Method:** Hargreaves-Samani (simplified, based on DHT22 data)\n**FAO-56 full method** requires solar radiation + wind speed sensors.`;
  }

  // ── FLOW SENSOR & WATER DELIVERY ──────────────────────────
  if(has(['flow','flow rate','paani kitna','water flow','flow sensor','yfs201','litre','delivery','water delivery','pipe','paani aaya'])){
    if(!d)return '\ud83d\udce1 No sensor data.';
    const flow=_fv(d.flowRate), total=_fv(d.totalLitres);
    const pumpOn=d.pump||false;
    return `\ud83d\udeb0 **Flow Sensor & Water Delivery**\n\n**Current Flow Rate:** ${flow.toFixed(2)} L/min\n**Session Total:** ${total.toFixed(1)} L\n**Pump Status:** ${pumpOn?'\ud83d\udfe2 ON':'\ud83d\udd34 OFF'}\n**Pipeline Fault:** ${d.pipelineFault?'\ud83d\udd34 YES \u2014 no flow detected':'\u2705 None'}\n\n${pumpOn&&flow<0.5?'\ud83d\udea8 **FAULT:** Pump ON but no flow!\n\u2192 Possible: Empty tank / Pipe blocked / Dry pump\n\u2192 Auto-stop triggered after 30s no-flow':pumpOn&&flow>0?'\u2705 Water flowing normally.\n\u2192 Monitor SM3 (45cm) to confirm root-zone delivery.':!pumpOn&&flow>0.3?'\ud83d\udea8 **ALERT:** Flow detected with pump OFF!\n\u2192 Possible leakage or pipe burst.\n\u2192 Check pipeline immediately.':'\u2705 No flow — pump is OFF (normal).'}\n\n**YF-S201 Calibration:** 7.5 pulses/L\n**Max rated flow:** 30 L/min`;
  }

  // ── TEMPERATURE & WEATHER ──────────────────────────────────
  if(has(['temperature','temp','garmi','thand','celsius','weather','mausam','humidity','naami hawa','pressure','barometric','bmp280','dht22'])){
    if(!d)return '\ud83d\udce1 No data.';
    const owmOK=owm&&owm.owm_valid;
    const tempDiff=owmOK?Math.abs(temp-(owm.owm_temp||0)).toFixed(1):null;
    return `\ud83c\udf21\ufe0f **Weather & Environmental Sensors**\n\n**Local Sensors (DHT22 + BMP280):**\nTemperature: **${temp.toFixed(1)}\u00b0C** ${d.dhtFallback?'\u26a0\ufe0f FAULT \u2014 OWM fallback':'\u2705 OK'}\nHumidity: **${_fv(d.humidity).toFixed(0)}%** ${_fv(d.humidity)<30?'\ud83d\udd25 Very dry air':_fv(d.humidity)>80?'\ud83d\udca7 Very humid':'✅ Normal'}\nPressure: **${_fv(d.pressure).toFixed(1)} hPa** ${d.bmpFallback?'\u26a0\ufe0f FAULT \u2014 OWM fallback':'\u2705 OK'}\n\n**OWM Cloud Data:**\n${owmOK?`Temp: ${owm.owm_temp?owm.owm_temp.toFixed(1):'--'}\u00b0C | Hum: ${owm.owm_humidity||'--'}% | Press: ${owm.owm_pressure||'--'} hPa\nDelta (local vs cloud): \u00b1${tempDiff}\u00b0C`:'\ud83d\udd34 OWM offline'}\n\n**Impact on Irrigation:**\n${temp>42?'\ud83d\udd25 Extreme heat \u2014 ETo very high. Irrigate morning/evening only.':temp>35?'\u2600\ufe0f High temp \u2014 increase monitoring frequency.':temp<15?'\u2603\ufe0f Cool \u2014 reduce irrigation; slow evaporation.':'\u2705 Temperature normal for irrigation.'}\n\n**VPD (Vapor Pressure Deficit):** ~${Math.max(0,(0.6108*Math.exp(17.27*temp/(temp+237.3)))*(1-_fv(d.humidity)/100)).toFixed(2)} kPa`;
  }

  // ── RAINFALL ANALYSIS ──────────────────────────────────────
  if(has(['rain','baarish','barish','rainfall','precipitation','tipping bucket','tip','tip bucket','runoff','effective rain','mm rain','baarish aayi','barsat'])){
    const tipMM=d?_fv(d.tipBucket_mm):0, owmMM=owm&&owm.owm_valid?owm.owm_rain_mm:0;
    const effRain=d?_fv(d.effectiveRain):0;
    const S=(25400/75)-254, Ia=0.2*S;
    const runoff=tipMM>Ia?Math.pow(tipMM-Ia,2)/(tipMM-Ia+S):0;
    return `\ud83c\udf27\ufe0f **Rainfall Intelligence Report**\n\n**Tipping Bucket (Most Accurate):**\nAccumulated: **${tipMM.toFixed(2)} mm**\nPulses recorded: ${d?_fv(d.tipBucket_pulses).toFixed(0):'--'} (0.2mm/tip)\n\n**OWM Cloud Rainfall:** ${owmMM>0?owmMM.toFixed(2)+' mm (1h)':'No rain reported'}\n**Rain Probability:** ${ri.prob.toFixed(0)}% ${ri.prob>75?'\ud83c\udf27\ufe0f Expected':ri.prob>35?'\u26c5 Possible':'\u2600\ufe0f Clear'}\n\n**Engineering Calculations (CN-75 Method):**\nGross Rainfall: ${tipMM.toFixed(2)} mm\nRunoff Estimate: ${runoff.toFixed(2)} mm\nEffective Rainfall: **${effRain.toFixed(2)} mm** (usable)\nRainfall Contribution to Budget: ${d?_fv(d.rainfallContrib).toFixed(1)+'L':' -- L'}\n\n${ri.prob>75?'\ud83d\udeab Irrigation SUPPRESSED \u2014 rain expected.':tipMM>10?'\u2705 Good rainfall \u2014 check CSMI before irrigating.':'\u2601\ufe0f Low/no rainfall \u2014 rely on irrigation as needed.'}`;
  }

  // ── WATER BUDGET (detailed) ────────────────────────────────
  if(has(['water budget','paani budget','budget','balance remaining','water balance','seasonal water','delta','seasonal need','water left','kitna paani bacha'])){
    if(!d)return '\ud83d\udce1 No data available.';
    const applied=_fv(d.deltaApplied), req=_fv(d.deltaRequired), bal=_fv(d.deltaBalance);
    const rainC=_fv(d.rainfallContrib), totalIn=applied+rainC;
    const pct=req>0?((totalIn/req)*100):0;
    const daysLeft=eto>0&&_fv(d.plotArea_m2)>0?Math.round(bal/(eto*_fv(d.plotArea_m2)/1000)):0;
    return `\ud83d\udcb0 **Seasonal Water Budget — ${crop.name}**\n\n**Seasonal Delta (\u0394):** ${crop.delta} mm\n**Plot Area:** ${_fv(d.plotArea_m2).toFixed(1)} m\u00b2\n**Total Seasonal Need:** ${req.toFixed(0)} L\n\n**Water Inputs:**\nIrrigation Applied: ${applied.toFixed(1)} L\nRainfall Contribution: ${rainC.toFixed(1)} L\nTotal Input: **${totalIn.toFixed(1)} L**\n\n**Balance Remaining: ${bal.toFixed(0)} L** (${(100-pct).toFixed(1)}%)\n\n**Budget Used:** ${'█'.repeat(Math.round(pct/10))}${'░'.repeat(10-Math.round(pct/10))} ${pct.toFixed(1)}%\n\n${wc?`**Today's Need:** ~${wc.needed} L\n  (Deficit: ${wc.deficit}L + ETo loss: ${wc.eto_l}L)`:''}\n\n**Estimated Days Remaining:** ~${daysLeft} days (at current ETo)\n\n${pct>90?'\ud83d\udea8 Budget almost exhausted! Check crop stage — near harvest?':pct>70?'\u26a0\ufe0f Past mid-season budget. Monitor closely.':'\u2705 Budget on track for this season.'}`;
  }

  // ── SENSOR HEALTH ──────────────────────────────────────────
  if(has(['sensor health','sensor fault','sensor kharab','sensor status','all sensors','sensor check','hardware','sensor band'])){
    if(!d)return '\ud83d\udce1 No data — check Firebase.';
    const issues=[];
    if(d.safeMode)issues.push('\ud83d\udd34 ALL SOIL SENSORS FAILED — Safe Mode active. Check CD4051 MUX wiring & power.');
    if(d.dhtFallback)issues.push('\ud83d\udfe1 DHT22 fault — OWM cloud data used as fallback. Check D2 pin wiring.');
    if(d.bmpFallback)issues.push('\ud83d\udfe1 BMP280 fault — Check I2C address (0x76/0x77) and SCL/SDA connections.');
    if(d.pipelineFault)issues.push('\ud83d\udd34 Flow/Pipeline fault — No flow detected. Check pump, pipe, and water source.');
    return `\ud83e\ude7a **Full Sensor Health Report**\n\nSoil Sensors (via CD4051 MUX):\nSM1 @ 15cm: ${!d.safeMode&&_fv(d.sm1)>0?'\u2705 OK — '+_fv(d.sm1).toFixed(1)+'%':'\ud83d\udd34 FAULT'}\nSM2 @ 30cm: ${!d.safeMode&&_fv(d.sm2)>0?'\u2705 OK — '+_fv(d.sm2).toFixed(1)+'%':'\ud83d\udd34 FAULT'}\nSM3 @ 45cm: ${!d.safeMode&&_fv(d.sm3)>0?'\u2705 OK — '+_fv(d.sm3).toFixed(1)+'%':'\ud83d\udd34 FAULT'}\n\nEnvironment:\nDHT22 (Temp/Hum): ${d.dhtFallback?'\u26a0\ufe0f FAULT — OWM fallback active':'\u2705 OK — '+temp.toFixed(1)+'\u00b0C / '+_fv(d.humidity).toFixed(0)+'%'}\nBMP280 (Pressure): ${d.bmpFallback?'\u26a0\ufe0f FAULT — OWM fallback':'\u2705 OK — '+_fv(d.pressure).toFixed(1)+' hPa'}\n\nActuator/Communication:\nYF-S201 Flow: ${d.pipelineFault?'\ud83d\udd34 FAULT':'\u2705 OK — '+_fv(d.flowRate).toFixed(2)+' L/min'}\nLoRa SX1278: \u2705 Active — 433 MHz\nFirebase: \u2705 Connected\n\n${issues.length===0?'\u2705 All sensors operating normally!':'\u26a0\ufe0f '+issues.length+' issue(s) detected:\n'+issues.map((v,i)=>(i+1)+'. '+v).join('\n')}`;
  }

  // ── PUMP STATUS (detailed) ─────────────────────────────────
  if(has(['pump','motor','pump not','pump status','motor status','pump on','pump off','relay','pump chalao','pump band','motor kharab'])){
    if(!d)return '\ud83d\udce1 No data — check Firebase.';
    const pumpOn=d.pump||false, auto=d.autoMode!==undefined?d.autoMode:true;
    const flow=_fv(d.flowRate), total=_fv(d.totalLitres);
    const whyOff=!pumpOn?(_fv(d.rainProb)>75?'\ud83c\udf27\ufe0f Rain probability >75% — auto-suppressed':csmi>65?'\ud83d\udca6 Soil moisture adequate — no trigger':score<65?'\ud83e\udd16 AI score '+score.toFixed(1)+'/65 — threshold not reached':d.pipelineFault?'\ud83d\udd34 Pipeline fault — auto-stopped':d.safeMode?'\u26a0\ufe0f Safe mode — sensors failed':'Unknown'):'N/A';
    return `\u2699\ufe0f **Pump & Irrigation Control**\n\nStatus: ${pumpOn?'\ud83d\udfe2 **PUMP ON — WATER FLOWING**':'\ud83d\udd34 **PUMP OFF**'}\nControl Mode: ${auto?'\ud83e\udd16 Automatic (AI-controlled)':'\u270b Manual control'}\nFlow Rate: ${flow.toFixed(2)} L/min\nSession Volume: ${total.toFixed(1)} L\nPipeline: ${d.pipelineFault?'\ud83d\udd34 FAULT DETECTED':'\u2705 Normal'}\n\n${!pumpOn?'**Why pump is OFF:**\n'+whyOff:''}\n\n**Pump Settings (firmware):**\nPulse ON: 30 seconds\nPulse OFF: 2 minutes\nCooldown: 1 hour minimum\nFlow Failsafe: Auto-stop at 30s if no flow\n\n**To activate pump:**\n${auto?'\u2192 Auto mode \u2014 wait for AI score \u226565 OR use Manual Mode button':'\u2192 Manual mode active \u2014 use Pump ON button above'}`;
  }

  // ── AI SCORE (deep explanation) ────────────────────────────
  if(has(['ai score','score kya','irrigation score','score explain','trigger','csmi score','smv','sma','tpr','score kam','score zyada','how does ai work','ai kaise kaam'])){
    if(!d)return '\ud83d\udce1 No data.';
    const gapTo65=Math.max(0,65-score);
    const components=[
      `CSMI Moisture Score: +${Math.max(0,(35-csmi)*1.5).toFixed(1)} pts (from CSMI ${csmi.toFixed(1)}%)`,
      `Drying Velocity (SMV): +${Math.max(0,_fv(d.smv)<-0.5?Math.min(20,Math.abs(_fv(d.smv))*10):0).toFixed(1)} pts`,
      `Temporal Pattern (TPR): +${(_fv(d.tprScore)*10).toFixed(1)} pts (${(_fv(d.tprScore)*100).toFixed(0)}% drying consistency)`,
      `ETo Demand: +${Math.max(0,(eto-3)*3).toFixed(1)} pts`,
      `Rain Penalty: -${_fv(d.rainProb)>75?40:_fv(d.rainProb)>35?15:0} pts`
    ];
    return `\ud83e\udd16 **AI Irrigation Score: ${score.toFixed(1)} / 120**\n\n**Trigger Threshold: 65**\nStatus: ${score>=65?'\u2705 ABOVE — Irrigation triggered':'\u23f3 BELOW — Waiting ('+gapTo65.toFixed(1)+' pts to trigger)'}\n\n**Score Breakdown:**\n${components.map((c,i)=>'\u2022 '+c).join('\n')}\n\n**What each component means:**\n\u2022 **CSMI <35%** → soil dry → high moisture score\n\u2022 **SMV <-0.5%/hr** → soil drying fast → velocity score\n\u2022 **TPR >0.85** → consistent drying pattern → bonus\n\u2022 **ETo >3mm/day** → high atmospheric demand → ETo score\n\u2022 **Rain >75%** → rain expected → -40 pts penalty\n\n**TPR Score:** ${_fv(d.tprScore).toFixed(3)} ${_fv(d.tprScore)>=0.85?'\u2705 Strong pattern':'(not enough drying history yet)'}\n\n${score>=65?'\ud83d\udca7 Irrigation is executing now.':'Next trigger in ~'+Math.ceil(gapTo65/(Math.max(0.1,(35-csmi)*0.15)))+' reading cycles (estimate)'}`;
  }

  // ── CSMI ALGORITHM EXPLANATION ────────────────────────────
  if(has(['csmi kya hai','csmi explained','csmi algorithm','weighted average','depth weight','stage weight','composite index'])){
    const stageNames=['Germination','Vegetative','Reproductive','Maturity'];
    const weights=[[0.50,0.30,0.20],[0.40,0.35,0.25],[0.30,0.40,0.30],[0.25,0.38,0.37]];
    const stage=d?Math.min(3,Math.max(0,Math.round(_fv(d.stage)))):0;
    const w=weights[stage];
    return `\ud83d\udcca **CSMI — Composite Soil Moisture Index**\n\nFormula:\n**CSMI = w1\u00d7SM1 + w2\u00d7SM2 + w3\u00d7SM3**\n\n**Current Stage: ${stageNames[stage]}**\nw1 (15cm): ${(w[0]*100).toFixed(0)}%\nw2 (30cm): ${(w[1]*100).toFixed(0)}%\nw3 (45cm): ${(w[2]*100).toFixed(0)}%\n\n${d?`Calculation:\n${(w[0]*100).toFixed(0)}% \u00d7 ${_fv(d.sm1).toFixed(1)}% + ${(w[1]*100).toFixed(0)}% \u00d7 ${_fv(d.sm2).toFixed(1)}% + ${(w[2]*100).toFixed(0)}% \u00d7 ${_fv(d.sm3).toFixed(1)}%\n= **${csmi.toFixed(2)}%**`:''}\n\n**Why weighted?**\nRoots grow deeper as crop matures:\n\u2022 Germination: shallow roots (15cm dominant)\n\u2022 Vegetative: moderate roots\n\u2022 Reproductive: full root zone (all 3 depths equal)\n\u2022 Maturity: deep water uptake important\n\n**Reference:** Hsiao (1990), FAO-56 root zone management`;
  }

  // ── ETo & WATER CALCULATION ────────────────────────────────
  if(has(['eto','evapotranspiration','evaporation','transpiration','water demand','etcrop','hargreaves','penman','etc','kc value'])){
    if(!d)return '\ud83d\udce1 No data.';
    const kc=[0.7,1.05,0.8,0.85,0.85,0.75,0.75,1.0];
    const etc=eto*kc[localConfig.crop];
    const dailyL=etc*_fv(d.plotArea_m2)/1000;
    return `\u2600\ufe0f **ETo Analysis — Evapotranspiration**\n\nReference ETo: **${eto.toFixed(2)} mm/day**\nCrop Kc: **${kc[localConfig.crop].toFixed(2)}** (${crop.name})\nCrop ETc: **${etc.toFixed(2)} mm/day**\nDaily Need: **~${dailyL.toFixed(1)} L** for ${_fv(d.plotArea_m2).toFixed(1)}m\u00b2\n\nMethod: Hargreaves-Samani (T=${temp.toFixed(1)}\u00b0C, RH=${_fv(d.humidity).toFixed(0)}%)\n\n${eto>7?'\ud83d\udd25 Very high demand — hot & dry. Irrigate more frequently.':eto>5?'\u2600\ufe0f High demand — monitor CSMI closely.':eto>3?'\u2600\ufe0f Moderate demand — standard schedule.':'\ud83c\udf25 Low demand — cool conditions, reduce irrigation.'}\n\nNote: Full FAO-56 Penman-Monteith needs solar radiation & wind speed sensors not currently installed.`;
  }

  // ── OFFLINE / LORA / HOTSPOT ──────────────────────────────
  if(has(['offline','hotspot','lora','autonomous','eeprom','sync','reconnect','tscric_ai','192.168','network','wifi','connectivity','internet nahi'])){
    if(!d)return '\ud83d\udce1 No live data — device may be offline.';
    return `\ud83d\udce1 **Offline & LoRa Communication System**\n\n**Current Mode:** ${d.offlineMode?'\ud83d\udd34 OFFLINE — Autonomous':'\ud83d\udfe2 ONLINE — Firebase connected'}\n**LoRa:** SX1278, 433 MHz, SF7, BW125kHz, 2-5km range\n**Hotspot SSID:** TSCRIC_AI (password: 12345678)\n**Offline Dashboard:** http://192.168.4.1 (when offline)\n**Pending Sync:** ${_fv(d.offlineLogCount)||0} / 50 events\n\n**How Offline Mode Works:**\n1\ufe0f\u20e3 WiFi lost → system detects within 60 seconds\n2\ufe0f\u20e3 LoRa radio activates → broadcasts sensor data every 30s\n3\ufe0f\u20e3 ESP8266 creates WiFi hotspot "TSCRIC_AI"\n4\ufe0f\u20e3 Farmer connects phone → opens 192.168.4.1\n5\ufe0f\u20e3 All irrigation decisions continue using local CSMI\n6\ufe0f\u20e3 Events stored in EEPROM (max 50)\n7\ufe0f\u20e3 WiFi restored → auto-sync to Firebase within 60s\n\n${d.offlineMode?'\u26a0\ufe0f Currently offline \u2014 data will sync when internet restored.':'\u2705 Connected \u2014 all data syncing to cloud normally.'}`;
  }

  // ── FIREBASE / CLOUD SYSTEM ────────────────────────────────
  if(has(['firebase','cloud','realtime database','rtdb','sync','data','cloud data','database'])){
    return `\u2601\ufe0f **Firebase Realtime Database (RTDB)**\n\nDatabase: ai-irrigation-system-1e112-default-rtdb\n\n**Data Structure:**\ntscric/sensors/ ← ESP8266 pushes every 15s\ntscric/config/  ← Dashboard saves settings\ntscric/commands/ ← Dashboard sends pump commands\ntscric/offline_logs/ ← Synced when WiFi restored\n\n**Update Frequency:**\nSensor push: every 15 seconds\nOWM weather: every 10 minutes\nCSMI calc: every 10 seconds (on device)\nDashboard refresh: real-time (Firebase listener)\n\n**Fields pushed:** ${Object.keys(d||{}).length}+ values including soil moisture, temperature, pressure, flow, AI score, pump state, water budget, LoRa status\n\n${d?'\u2705 Firebase connected and receiving live data.':'\ud83d\udd34 Firebase not connected — check credentials in app.js'}`;
  }

  // ── OWM WEATHER ────────────────────────────────────────────
  if(has(['owm','openweathermap','cloud weather','weather api','forecast','aaj ka mausam','kal ka mausam','weather today'])){
    const owmOK=owm&&owm.owm_valid;
    return `\ud83c\udf29\ufe0f **OpenWeatherMap Integration**\n\nStatus: ${owmOK?'\ud83d\udfe2 LIVE — data available':'\ud83d\udd34 Offline / API error'}\n${owmOK?`Location: ${WEATHER_LOCATIONS[selectedWeatherLocation]?.label||selectedWeatherLocation}\nTemperature: ${owm.owm_temp!==null?owm.owm_temp.toFixed(1):'--'}\u00b0C\nHumidity: ${owm.owm_humidity||'--'}%\nPressure: ${owm.owm_pressure||'--'} hPa\nRainfall (1h): ${owm.owm_rain_mm>0?owm.owm_rain_mm.toFixed(2):'0.00'} mm\nRain Probability: ${owm.owm_rain_prob?owm.owm_rain_prob.toFixed(0):0}%`:''}\n\n**Data Priority:**\n1\ufe0f\u20e3 DHT22 local sensor (temperature, humidity)\n2\ufe0f\u20e3 BMP280 local sensor (pressure)\n3\ufe0f\u20e3 OWM API (backup + rain probability + forecast)\n\nLocal sensors ALWAYS override OWM for temperature/humidity/pressure.\nOWM used for: rain probability, rainfall forecast, DHT22/BMP280 fallback.\n\n**API Key:** e4efeb48... (free tier, 1000 calls/day)\n**Update interval:** Every 10 minutes`;
  }

  // ── LEAKAGE / FAULT DETECTION ─────────────────────────────
  if(has(['leakage','leak','pipe burst','tapka','water waste','paani beh raha','paani kharab','fault','pipeline','blockage','band pipe'])){
    if(!d)return '\ud83d\udce1 No data.';
    const flow=_fv(d.flowRate), pumpOn=d.pump||false;
    const leakScore=!pumpOn&&flow>0.3?Math.min(100,flow*30):0;
    const blockScore=pumpOn&&flow>0&&flow<2?Math.round((1-flow/2)*100):0;
    return `\ud83d\udd0d **Pipeline Fault Diagnostics**\n\nFlow Rate: ${flow.toFixed(2)} L/min\nPump State: ${pumpOn?'\ud83d\udfe2 ON':'\ud83d\udd34 OFF'}\n\n**Leakage Score: ${leakScore.toFixed(0)}/100** ${leakScore>50?'\ud83d\udea8 LIKELY LEAKAGE!':leakScore>10?'\u26a0\ufe0f Possible leakage':'\u2705 No leakage'}\n**Blockage Index: ${blockScore}%** ${blockScore>60?'\ud83d\udeab BLOCKED!':blockScore>30?'\u26a0\ufe0f Partial blockage':'\u2705 Clear'}\n**Dry-Run Risk:** ${pumpOn&&flow<0.3?'\ud83d\udd34 HIGH — no flow with pump ON':'\u2705 None'}\n\n**Common Causes:**\n${leakScore>30?'\u2022 Leakage: Joint failure, corrosion, animal damage\n\u2022 Action: Inspect all joints; check pump outlet':''}\n${blockScore>30?'\u2022 Blockage: Debris, sand, root intrusion\n\u2022 Action: Flush line, check filter':''}\n${pumpOn&&flow<0.3?'\u2022 Dry-run: Empty tank, pump cavitation\n\u2022 Action: Check water level, prime pump':''}\n${leakScore===0&&blockScore===0&&(!pumpOn||flow>2)?'\u2705 All pipeline parameters normal.':''}`;
  }

  // ── DRIP / IRRIGATION SYSTEM DESIGN ───────────────────────
  if(has(['drip','drip irrigation','sprinkler','flood irrigation','subsurface','micro irrigation','irrigation system','irrigation design','sinchai system'])){
    return `\ud83d\udca7 **Irrigation System Guide for ${crop.name}**\n\n**Recommended System:**\n${[0,2,4,5,6].includes(localConfig.crop)?'\u2705 Drip Irrigation (Best choice)':localConfig.crop===1?'\ud83c\udf3e Flood/Furrow (traditional) or AWD method':'\u2705 Drip or Sprinkler suitable'}\n\n**Drip System Advantages:**\n\u2022 90-95% application efficiency (vs 40-60% flood)\n\u2022 Reduces weed growth and disease\n\u2022 Works with TSCRIC-LoRa CSMI sensors\n\u2022 Saves 30-50% water\n\n**TSCRIC-LoRa Integration:**\nFlow sensor (YF-S201) monitors actual delivery\nSM3 (45cm) sensor confirms root-zone wetness\nCSMI triggers pump ONLY when needed\n\n**System Design Parameters:**\nCrop Delta: ${crop.delta} mm/season\nField Capacity: ${crop.fc}%\nIrrigation Trigger: CSMI < ${crop.pwp+15}%\nStop Point: CSMI > ${crop.fc-5}%\n\n**Application Efficiency (your system):**\nConveyance: ~90% | Application: ~85-95% (drip)\nOverall: ~75-80%`;
  }

  // ── GDD / CROP GROWTH STAGE ───────────────────────────────
  if(has(['gdd','growing degree','crop stage','growth stage','stage','vegetative','reproductive','maturity','germination','days after','das','phenology'])){
    if(!d)return '\ud83d\udce1 No data.';
    const gdd=_fv(d.gdd), stage=Math.min(3,Math.max(0,Math.round(_fv(d.stage))));
    const stageNames=['Germination (0-21 DAS)','Vegetative (22-55 DAS)','Reproductive (56-90 DAS)','Maturity (91+ DAS)'];
    const stageDesc=['Shallow roots — moisture critical at top 15cm. Keep surface moist. CSMI weight: 50% on SM1.','Root development — monitor all 3 depths. High N demand. CSMI weight: 40/35/25.','Flowering & grain fill — MOST CRITICAL for yield. Water stress = yield loss. CSMI weight: 30/40/30.','Ripening — reduce irrigation. Facilitate drying. CSMI weight: 25/38/37.'];
    return `\ud83d\udcc5 **Crop Growth Stage Analysis**\n\n**Crop:** ${CROP_DATA[localConfig.crop].name}\n**GDD Accumulated:** ${gdd.toFixed(0)} \u00b0C\u00b7day\n**Current Stage:** ${stageNames[stage]}\n\n**Stage Description:**\n${stageDesc[stage]}\n\n**CSMI Irrigation Threshold:** ${[25,28,30,22][stage]}%\n\n**Temperature Today:** ${temp.toFixed(1)}\u00b0C\n**GDD Today:** +${Math.max(0,temp-10).toFixed(1)} \u00b0C (base temp 10\u00b0C)\n\n**Important:**\n${stage===2?'\u26a0\ufe0f You are in the CRITICAL reproductive stage. Never allow water stress now. Yield directly depends on adequate moisture.':stage===0?'\ud83c\udf31 Keep soil moist at 15cm depth for uniform germination.':stage===3?'\ud83c\udf3e Begin reducing irrigation. Facilitate grain drying.':'\u2705 Normal monitoring. Maintain CSMI above '+[25,28,30,22][stage]+'%.'}`;
  }

  // ── FERTILIZER / NUTRIENT ADVICE ──────────────────────────
  if(has(['fertilizer','khad','urea','dap','npk','nitrogen','phosphorus','potassium','nutrient','fertigation','micronutrient','manure','compost'])){
    const fertGuide={
      0:'Wheat: Basal DAP 50kg/acre. Urea split: at sowing + crown root + tillering. Avoid fertilizer when soil very dry.',
      1:'Rice: Pre-transplant DAP. Urea in 3 splits (basal + tillering + panicle). Zinc sulfate if deficiency.',
      2:'Maize: High N demand. Basal NPK + 2 topdress urea at knee height & tasseling.',
      3:'Cotton: Low N early, high K at boll formation. Avoid excess N — causes vegetative growth.',
      4:'Soybean: Rhizobium inoculant reduces N need. Phosphorus critical for root nodulation.',
      5:'Chickpea: Minimal N (nodules fix N). DAP at sowing. Avoid waterlogging — Rhizobium sensitive.',
      6:'Mustard: High sulfur demand — use SSP or gypsum. Boron spray at flowering.',
      7:'Sugarcane: Highest NPK demand. Trash mulching saves water and adds organic matter.'
    };
    return `\ud83c\udf3f **Fertilizer & Nutrition Advisory**\n\n**Crop:** ${CROP_DATA[localConfig.crop].name}\n\n${fertGuide[localConfig.crop]}\n\n**General Rules with TSCRIC-LoRa:**\n\u2022 Apply fertilizer when CSMI is 40-60% (optimal absorption)\n\u2022 Never apply on bone-dry or waterlogged soil\n\u2022 Fertigation (drip) = 30% better efficiency\n\u2022 Current CSMI: ${d?csmi.toFixed(1)+'% '+( csmi>35&&csmi<65?'\u2705 Good time to fertilize':'\u26a0\ufe0f Wait for better moisture condition'):'--'}\n\n**Soil Health Sensors (if installed):**\nEC > 3 mS/cm = reduce fertilizer (salt stress)\npH < 6 = add lime | pH > 8 = add sulfur\n\n\u26a0\ufe0f Always follow local Krishi Vigyan Kendra (KVK) guidelines for your district.`;
  }

  // ── PEST & DISEASE ────────────────────────────────────────
  if(has(['pest','disease','insects','kida','bimari','fungus','rust','blight','aphid','whitefly','caterpillar','spray','pesticide','fungicide'])){
    const diseaseRisk=d&&_fv(d.humidity)>80&&temp>25?'HIGH — hot and humid conditions favor fungal diseases':'MODERATE';
    return `\ud83d\udc1b **Pest & Disease Risk Advisory**\n\n**Current Conditions:**\nTemperature: ${d?temp.toFixed(1)+'°C':' --'} | Humidity: ${d?_fv(d.humidity).toFixed(0)+'%':' --'}\n**Disease Risk Level:** ${diseaseRisk}\n\n**Water-Related Diseases (${CROP_DATA[localConfig.crop].name}):**\n${localConfig.crop===0?'\u2022 Yellow rust (Puccinia): Thrives 10-15°C, high humidity\n\u2022 Powdery mildew: Dry conditions + humidity fluctuation\n\u2022 Root rot: Waterlogged soil > 48 hours':localConfig.crop===1?'\u2022 Blast (Magnaporthe): Night dew + high humidity\n\u2022 BLB (Xanthomonas): Flooding, heavy rain\n\u2022 Brown planthopper: Standing water':'\u2022 Maintain optimal soil moisture\n\u2022 Waterlogged soil promotes root rot\n\u2022 Dry stressed plants attract sucking pests (aphids, mites)'}\n\n**Prevention via Smart Irrigation:**\n\u2022 Avoid evening irrigation (leaf wetness overnight = fungal risk)\n\u2022 Morning irrigation preferred — leaves dry by noon\n\u2022 Maintain CSMI ${crop.pwp+10}—${crop.fc-5}% (avoid stress AND waterlogging)\n\n\ud83d\udc1b For specific pest ID and spray schedule, consult local KVK or Krishi Adhikari.`;
  }

  // ── SYSTEM EXPLANATION (what is TSCRIC) ──────────────────
  if(has(['what is tscric','tscric kya hai','system explain','how does this work','ye kya hai','project explain','system overview','how it works'])){
    return `\ud83c\udf3e **TSCRIC-LoRa System Overview**\n\nFull Name: **Temporal Soil-Crop Resonance Irrigation Controller with LoRa**\n\n**Hardware:**\n\u2022 ESP8266 NodeMCU (80MHz, 4MB Flash, WiFi)\n\u2022 3x Capacitive Soil Sensors (15/30/45cm via CD4051 MUX)\n\u2022 DHT22 (Temperature + Humidity)\n\u2022 BMP280 (Barometric pressure + Altitude)\n\u2022 YF-S201 (Water flow measurement)\n\u2022 SX1278 LoRa (433 MHz, 2-5km range)\n\u2022 5V Relay (Pump control)\n\n**Software:**\n\u2022 Firebase Realtime DB (cloud sync every 15s)\n\u2022 OpenWeatherMap API (rain forecast)\n\u2022 CSMI Algorithm (weighted root-zone index)\n\u2022 AI Score Engine (SMV + SMA + TPR + ETo)\n\u2022 This dashboard (GitHub Pages PWA)\n\n**What it does:**\nReads soil moisture at 3 depths → calculates CSMI → computes AI score → triggers pump ONLY when needed → tracks water budget → works offline with LoRa\n\n**Academic:** B.Tech Civil Engineering Minor Project\nOCT Bhopal | RGPV | 2024-25\nGuide: Dr. Yogesh Iyer Murthy`;
  }

  // ── HELP / CAPABILITIES LIST ──────────────────────────────
  if(has(['help','kya puchh','kya pooch','what can you','capabilities','topics','questions','main kya puchh','mujhe bata','guide karo','sab topics'])){
    return `\ud83e\udd16 **AI Farm Assistant — Complete Topic Guide**\n\nYou can ask me about:\n\n**\ud83c\udf31 Soil & Moisture**\n\u2022 Current soil moisture (CSMI, SM1/2/3)\n\u2022 CSMI algorithm explanation\n\u2022 Root zone depletion analysis\n\u2022 Field capacity & wilting point\n\n**\ud83d\udca7 Irrigation**\n\u2022 When to irrigate (kab sinchai karein)\n\u2022 How much water (kitna paani dein)\n\u2022 How long to run pump\n\u2022 When to stop irrigation\n\u2022 Best timing (morning/evening)\n\u2022 After rain irrigation advice\n\u2022 Heat stress irrigation\n\n**\u2699\ufe0f System & Hardware**\n\u2022 Pump status and control\n\u2022 Flow sensor readings\n\u2022 Sensor health check\n\u2022 Leakage & fault detection\n\u2022 LoRa diagnostics\n\u2022 Offline mode & hotspot\n\u2022 Firebase cloud status\n\u2022 OWM weather status\n\n**\ud83e\udd16 AI & Analytics**\n\u2022 AI score explanation\n\u2022 ETo evapotranspiration\n\u2022 Water budget tracking\n\u2022 Rainfall analysis\n\u2022 Crop growth stages (GDD)\n\n**\ud83c\udf3e Agronomy**\n\u2022 Crop-specific advice (8 crops)\n\u2022 Fertilizer guidance\n\u2022 Pest & disease risk\n\u2022 Drip/sprinkler system design\n\n**\ud83d\udcca Reports**\n\u2022 Full farm status analysis\n\u2022 System overview\n\nJust type your question in Hindi or English!`;
  }

  // ── FULL ANALYSIS ─────────────────────────────────────────
  if(has(['full analysis','complete analysis','farm status','system status','everything','analysis karo','sab batao','poora analysis'])){
    if(!d)return '\ud83d\udce1 No live data — connect hardware first.';
    const sl=getSoilLevel(csmi), wc=getWaterCalc();
    const applied=_fv(d.deltaApplied), req=_fv(d.deltaRequired);
    const pct=req>0?((applied/req)*100):0;
    const kc=[0.7,1.05,0.8,0.85,0.85,0.75,0.75,1.0];
    const etc=(eto*kc[localConfig.crop]).toFixed(2);
    return `\ud83d\udcca **Complete Farm Status Report**\n\n\ud83c\udf3e **Crop:** ${d.crop||crop.name} | **Stage:** ${d.stage||'--'} | **GDD:** ${_fv(d.gdd).toFixed(0)} \u00b0C\u00b7day\n\ud83d\udccd **Area:** ${_fv(d.plotArea_m2).toFixed(1)}m\u00b2 (${(_fv(d.plotArea_m2)/BIGHA_TO_M2).toFixed(4)} Bigha)\n\n\ud83c\udf31 **Soil Moisture:**\nSM1: ${_fv(d.sm1).toFixed(1)}% | SM2: ${_fv(d.sm2).toFixed(1)}% | SM3: ${_fv(d.sm3).toFixed(1)}%\nCSMI: **${csmi.toFixed(1)}%** — ${sl.level}\nSafe Mode: ${d.safeMode?'\ud83d\udd34 ACTIVE':'\u2705 None'}\n\n\ud83e\udd16 **AI Engine:**\nScore: **${score.toFixed(1)}/120** ${score>=65?'→ TRIGGERED':' → monitoring (needs '+(65-score).toFixed(0)+' more pts)'}\nSMV: ${_fv(d.smv).toFixed(4)} | TPR: ${_fv(d.tprScore).toFixed(3)} | ETo: ${eto.toFixed(2)} mm/day\nETc: ${etc} mm/day\n\n\ud83d\udca7 **Pump:**\n${d.pump?'\ud83d\udfe2 ON — flow '+_fv(d.flowRate).toFixed(2)+' L/min':'\ud83d\udd34 OFF'} | ${d.autoMode?'Auto':'Manual'} | Fault: ${d.pipelineFault?'\ud83d\udd34 YES':'\u2705 None'}\n\n\ud83c\udf27\ufe0f **Rain:** ${ri.prob.toFixed(0)}% probability | ${ri.mm.toFixed(2)}mm recorded\n\ud83c\udf21\ufe0f **Weather:** ${temp.toFixed(1)}\u00b0C | ${_fv(d.humidity).toFixed(0)}% RH | ${_fv(d.pressure).toFixed(0)} hPa\n\n\ud83d\udcb0 **Water Budget:** ${pct.toFixed(0)}% used | ${_fv(d.deltaBalance).toFixed(0)}L remaining\n${wc?`Today's need: ~${wc.needed}L`:''}\n\n\ud83d\udce1 **System:** ${d.offlineMode?'\ud83d\udd34 Offline ('+(_fv(d.offlineLogCount)||0)+' pending)':'\ud83d\udfe2 Online'}\n\n\ud83d\udca1 **ACTION REQUIRED:**\n${d.pipelineFault?'\ud83d\udd34 1. FIX PIPELINE FAULT IMMEDIATELY':''}\n${d.safeMode?'\ud83d\udd34 2. FIX ALL SOIL SENSORS':''}\n${!d.pipelineFault&&!d.safeMode&&ri.prob>65?'\ud83c\udf27\ufe0f Rain coming — hold irrigation.':!d.pipelineFault&&!d.safeMode&&csmi<20?'\ud83d\udea8 IRRIGATE NOW — critical dry!':!d.pipelineFault&&!d.safeMode&&csmi<35?'\u26a0\ufe0f Plan irrigation soon.':!d.pipelineFault&&!d.safeMode&&csmi>75?'\ud83d\udca6 Too wet — skip irrigation.':'\u2705 Conditions optimal — continue monitoring.'}`;
  }

  // ── DEFAULT (smart context-aware) ─────────────────────────
  const sl=d?getSoilLevel(csmi):null;
  const nowHour=new Date().getHours();
  const timeGreet=nowHour<12?'\ud83c\udf05 Good morning':nowHour<17?'\ud83c\udf1e Good afternoon':'\ud83c\udf19 Good evening';
  return `${timeGreet}! \ud83c\udf3e **TSCRIC-LoRa Assistant**\n\n${d?`**Live Status:**\n\u2022 Soil: ${sl.level} (CSMI ${csmi.toFixed(1)}%)\n\u2022 AI Score: ${score.toFixed(1)}/120 ${score>=65?'\u2705 Triggered':'\u23f3 Monitoring'}\n\u2022 Pump: ${d.pump?'\ud83d\udfe2 ON — '+_fv(d.flowRate).toFixed(2)+' L/min':'\ud83d\udd34 OFF'} | ${d.autoMode?'Auto':'Manual'}\n\u2022 Rain: ${ri.prob.toFixed(0)}% | Temp: ${temp.toFixed(1)}\u00b0C\n\u2022 Budget: ${_fv(d.deltaBalance).toFixed(0)}L remaining\n\n`:'**Waiting for sensor data...**\n\n'}**Ask me about (Hindi ya English mein):**\n\ud83c\udf31 Soil moisture • Irrigation timing • Water budget\n\u2699\ufe0f Pump control • Sensor health • Leakage detection\n\ud83c\udf27\ufe0f Rainfall analysis • ETo • Crop stage advice\n\ud83e\udd16 AI score • CSMI algorithm • Full analysis\n\ud83c\udf3e Crop advice • Fertilizer • Pest & disease\n\nType \`help\` to see all topics!`;
}

function detectIrrigationIntent(q2,has,d,_fv){
  if(has(['kab sinchai','kab pani','kab paani','when to irrigate','when to water','irrigation time','abhi karo','aaj karo','run now','should irrigation run','irrigate now']))return 'irrig_when';
  if(has(['kitni der','kitna time','kitne minute','how long','duration','how many times','kitni baar','pump kitni der']))return 'irrig_duration';
  if(has(['kitna paani','kitna pani','paani kitna','how much water','kitne litre','quantity','amount','water quantity']))return 'irrig_quantity';
  if(has(['sinchai band','paani band','pump band','stop irrigation','roko','band karo','when to stop','stop pump']))return 'irrig_stop';
  if(has(['zyada paani','bahut paani','over water','overwater','paani zyada','waterlog','flood','excess water']))return 'irrig_over';
  if(has(['kam paani','thoda paani','paani ki kami','insufficient','under water','not enough water','underwatering']))return 'irrig_under';
  if(has(['baarish ke baad','rain ke baad','after rain','baarish ho gayi','rain ho gaya','post rain']))return 'irrig_after_rain';
  if(has(['garmi mein','summer mein','hot weather','garam mein','tez dhoop','heat stress irrigation']))return 'irrig_heat';
  if(has(['raat mein','night mein','raat ko','subah mein','early morning','evening mein','best time to irrigate']))return 'irrig_timing';
  if(has(['fasal sukh','plant dying','paudha sukh','stress','murjha','yellow leaves','wilting','crop dying']))return 'irrig_stress';
  return null;
}

function irrigationMasterResponse(intent,d,_fv,owm){
  const sl=d?getSoilLevel(_fv(d.csmi)):null, ri=getRainInfo(), calc=getWaterCalc();
  const csmi=d?_fv(d.csmi):0, temp=d?_fv(d.temperature):30, eto=d?_fv(d.eto):3;
  switch(intent){
    case 'irrig_when':{
      const L=['\u23f0 **Sinchai Kab Karni Chahiye?**\n'];
      if(!d){L.push('\ud83d\udce1 Sensor data nahi \u2014 hardware check karo.');return L.join('\n');}
      L.push('Mitti: '+(sl?sl.level:'--')+' ('+csmi.toFixed(1)+'%)');
      L.push('AI Score: '+_fv(d.aiScore).toFixed(1)+'/120 | Rain: '+ri.prob.toFixed(0)+'%\n');
      if(ri.prob>65){L.push('\ud83c\udf27\ufe0f **Abhi nahi!** Baarish '+ri.prob.toFixed(0)+'% expected.');L.push('\u2192 Baarish ke baad mitti check karo.');}
      else if(csmi<25){L.push('\ud83d\udea8 **Abhi turant karo!** Mitti bahut dry hai.');}
      else if(csmi<40){L.push('\u26a0\ufe0f **Aaj karo.** Best time: Subah 6-9 ya Shaam 5-7 baje.');}
      else{L.push('\u2705 Abhi zaroorat nahi. CSMI '+csmi.toFixed(1)+'% \u2014 theek hai.');}
      L.push('\n\ud83d\udca1 Kabhi bhi tez dhoop mein sinchai mat karo.');
      return L.join('\n');
    }
    case 'irrig_duration':{
      if(!d)return '\ud83d\udce1 Sensor data nahi.';
      const area=_fv(d.plotArea_m2)||10, flowR=_fv(d.flowRate)>0?_fv(d.flowRate):5;
      const neededL=calc?parseFloat(calc.needed):(area*0.5);
      return `\u23f1\ufe0f **Sinchai Duration**\n\nArea: ${area.toFixed(1)}m\u00b2 | Flow: ${flowR.toFixed(2)}L/min\nEstimated: ~${(neededL/flowR).toFixed(0)} minutes\n\nSystem: Pulse mode (30s ON / 2min OFF)\nStop when CSMI reaches 50-60%.`;
    }
    case 'irrig_quantity':{
      if(!d)return '\ud83d\udce1 No data.';
      const area=_fv(d.plotArea_m2)||10;
      return `\ud83d\udca7 **Paani Quantity**\n\nArea: ${area.toFixed(1)}m\u00b2 | CSMI: ${csmi.toFixed(1)}% | ETo: ${eto.toFixed(2)}mm/day\n${calc?`Deficit: ~${calc.needed}L | ETo demand: ~${calc.eto_l}L`:'Insufficient data.'}\nBudget remaining: ${_fv(d.deltaBalance).toFixed(1)}L\n${ri.prob>40?`\ud83c\udf27\ufe0f ${ri.prob.toFixed(0)}% baarish \u2014 thoda kam do.`:''}`;
    }
    case 'irrig_stop':{
      if(!d)return '\ud83d\udce1 Data nahi.';
      return `\ud83d\uded1 **Sinchai Band Kab?**\n\nCSMI: ${csmi.toFixed(1)}% | Pump: ${d.pump?'\ud83d\udfe2 ON':'\ud83d\udd34 Already OFF'}\n\n${!d.pump?'\u2705 Pump pehle se band hai.':csmi>=55?'\ud83d\uded1 **Abhi band karo!** CSMI '+csmi.toFixed(1)+'% \u2014 kaafi ho gaya.':csmi>=45?'\ud83d\udcca Thodi der aur \u2014 55% tak jaane do.':'\u23f3 Continue karo \u2014 mitti abhi dry hai ('+csmi.toFixed(1)+'%).'}`;
    }
    case 'irrig_over': return `\ud83d\udca6 **Overwatering Prevention**\n\nCSMI: ${csmi.toFixed(1)}%\n${csmi>70?'\u26a0\ufe0f Mitti already wet!\n\u2192 Irrigation immediately stop karo.\n\u2192 Drainage check karo.\n\u2192 Root rot risk!':'\u2705 Current moisture level safe.\n\u2192 Monitor CSMI \u2014 if >75%, stop irrigation.'}\n\nSystem: Deep sensor (SM3 45cm) monitors waterlogging. If SM3 > FC, pump auto-stops.`;
    case 'irrig_under': return `\ud83d\udca7 **Underwatering Detection**\n\nCSMI: ${csmi.toFixed(1)}%\n${csmi<25?'\ud83d\udea8 CONFIRMED: Mitti critically dry!\n\u2192 Irrigation start karo immediately.\n\u2192 Crop wilting risk.':csmi<35?'\u26a0\ufe0f Mitti dry ho rahi hai.\n\u2192 Plan irrigation in next 2-4 hours.':'\u2705 Moisture level adequate \u2014 no underwatering detected.'}`;
    case 'irrig_after_rain': return `\ud83c\udf27\ufe0f **Rain Ke Baad Sinchai**\n\nCSMI: ${csmi.toFixed(1)}%\nRain: ${ri.mm.toFixed(2)}mm detected\n\n${csmi>55?'\u2705 Baarish ke baad mitti '+csmi.toFixed(1)+'% \u2014 sinchai ki zaroorat nahi.':'\ud83d\udcca Mitti abhi bhi '+csmi.toFixed(1)+'% \u2014 baarish poori nahi thi.\n\u2192 3-4 ghante baad fir check karo.'}\n\nSystem automatically updates water budget with effective rainfall.`;
    case 'irrig_heat': return `\ud83d\udd25 **Garmi Mein Sinchai**\n\nTemp: ${temp.toFixed(1)}\u00b0C | ETo: ${eto.toFixed(2)}mm/day\n${temp>40?'\ud83c\udf21\ufe0f Extreme heat! ETo very high.\n\u2192 Frequency badhao: har 6-8 ghante check\n\u2192 Best time: Subah 5-6 aur Shaam 6-7\n\u2192 Mulching se 30-40% soil moisture save hoga':'\u2600\ufe0f Garmi mein:\n\u2192 Morning or evening only\n\u2192 Avoid 10am-4pm (60% evaporation)\n\u2192 Monitor CSMI every 4 hours'}`;
    case 'irrig_timing': return `\u23f0 **Sinchai Ka Best Time**\n\n\u2705 Ideal:\n\u2022 Subah 5\u20139 baje (best!)\n\u2022 Shaam 5\u20137 baje (second best)\n\n\u274c Avoid:\n\u2022 Dopahar 10am\u20134pm (60% evaporation loss)\n\u2022 Raat 9pm ke baad (fungal disease risk)\n\n${new Date().getHours()>=10&&new Date().getHours()<=16?'\u26a0\ufe0f Peak hours \u2014 subah ya shaam tak wait karo.':'\u2705 Good time for irrigation!'}`;
    case 'irrig_stress': return `\ud83d\ude30 **Crop Stress Analysis**\n\nCSMI: ${csmi.toFixed(1)}% | Temp: ${temp.toFixed(1)}\u00b0C\n\n${csmi<25?'\ud83d\udd34 Water stress confirmed \u2014 IMMEDIATELY irrigate!\n\u2192 Mitti critically dry\n\u2192 Permanent wilting risk':csmi>80?'\ud83d\udca6 Overwatering stress!\n\u2192 Drainage improve karo\n\u2192 Irrigation band karo':temp>42?'\ud83d\udd25 Heat stress!\n\u2192 Shade netting lagao\n\u2192 More frequent irrigation':'Moisture aur temp theek hai.\n\u2192 Pest/disease check karo\n\u2192 Nutrient deficiency possible\n\u2192 Soil compaction check karo'}`;
    default: return ruleBasedResponse('full analysis');
  }
}

// ── Message rendering ──────────────────────────────────────
function appendAIMessage(role,text,isWelcome){
  const container=document.getElementById('aiChatMessages'); if(!container)return;
  const wrap=document.createElement('div');
  wrap.className='ai-msg-wrap '+(role==='user'?'ai-msg-wrap--user':'ai-msg-wrap--model');
  const bubble=document.createElement('div');
  bubble.className='ai-bubble '+(role==='user'?'ai-bubble--user':'ai-bubble--model');
  bubble.innerHTML=formatAIText(text);
  const ts=document.createElement('div'); ts.className='ai-timestamp';
  ts.textContent=new Date().toLocaleTimeString([],{hour:'2-digit',minute:'2-digit'});
  if(role==='model'){
    const av=document.createElement('div'); av.className='ai-avatar'; av.textContent=isWelcome?'\ud83c\udf3e':'\ud83e\udd16';
    wrap.appendChild(av); wrap.appendChild(bubble); wrap.appendChild(ts);
  } else { wrap.appendChild(ts); wrap.appendChild(bubble); }
  container.appendChild(wrap);
  container.scrollTo({top:container.scrollHeight,behavior:'smooth'});
}

function formatAIText(raw){
  if(!raw||typeof raw!=='string')return '<p>\u2014</p>';
  const lines=raw.split('\n'); let html='',inList=false,listTag='ul';
  const close=()=>{if(inList){html+=`</${listTag}>`;inList=false;}};
  const fmt=s=>s.replace(/\*\*\*(.+?)\*\*\*/g,'<strong><em>$1</em></strong>').replace(/\*\*(.+?)\*\*/g,'<strong>$1</strong>').replace(/\*(.+?)\*/g,'<em>$1</em>').replace(/`(.+?)`/g,'<code>$1</code>');
  for(const rawLine of lines){
    const line=rawLine.trimEnd();
    if(!line.trim()){close();if(html&&!html.endsWith('<br>'))html+='<br>';continue;}
    if(/^#{1,3}\s/.test(line)){close();html+=`<p class="ai-heading">${fmt(line.replace(/^#{1,3}\s+/,''))}</p>`;continue;}
    if(/^[-*]{3,}$/.test(line.trim())){close();html+='<hr class="ai-hr">';continue;}
    const ul=line.match(/^(\s*)([-*\u2022])\s+(.+)$/);
    if(ul){if(!inList||listTag!=='ul'){close();html+='<ul>';inList=true;listTag='ul';}html+=`<li>${fmt(ul[3])}</li>`;continue;}
    const ol=line.match(/^(\s*)\d+[.)]\s+(.+)$/);
    if(ol){if(!inList||listTag!=='ol'){close();html+='<ol>';inList=true;listTag='ol';}html+=`<li>${fmt(ol[2])}</li>`;continue;}
    close(); html+=`<span>${fmt(line)}</span><br>`;
  }
  close();
  return html.replace(/(<br>)+$/,'')||'<p>\u2014</p>';
}

function setAILoading(loading){
  aiIsLoading=loading;
  const ind=document.getElementById('aiTypingIndicator');
  const btn=document.getElementById('aiSendBtn');
  const ico=document.getElementById('aiSendIcon');
  if(ind)ind.style.display=loading?'flex':'none';
  if(btn)btn.disabled=loading;
  if(ico)ico.textContent=loading?'\u23f3':'\u27a4';
  if(loading){const c=document.getElementById('aiChatMessages');if(c)c.scrollTo({top:c.scrollHeight,behavior:'smooth'});}
}

function updateAIStatusBadge(state){
  const badge=document.getElementById('aiStatusBadge'), dot=document.getElementById('aiGlowDot');
  if(!badge)return;
  const states={ready:{text:'\u25cf Ready',cls:'ai-badge--ready'},thinking:{text:'\u25ce Thinking\u2026',cls:'ai-badge--thinking'},offline:{text:'\u25cb Offline',cls:'ai-badge--offline'},error:{text:'\u25cf Error',cls:'ai-badge--error'}};
  const s=states[state]||states.ready;
  badge.textContent=s.text; badge.className='ai-status-badge '+s.cls;
  if(dot)dot.className='ai-chat-glow-dot '+s.cls;
}

function clearAIChat(){aiChatHistory=[];const c=document.getElementById('aiChatMessages');if(c)c.innerHTML='';initAIChat();}
function handleAIInputKey(event){if(event.key==='Enter'&&!event.shiftKey){event.preventDefault();sendAIMessage();}}
function autoResizeTextarea(el){el.style.height='auto';el.style.height=Math.min(el.scrollHeight,120)+'px';updateCharCount(el.value.length);}
function updateCharCount(len){const el=document.getElementById('aiCharCount');if(el){el.textContent=len+'/500';el.style.color=len>450?'var(--orange)':'var(--text-muted)';}}

function bootstrapAIChat(){
  if(aiChatBooted)return; aiChatBooted=true;
  initAIChat(); updateAIStatusBadge('ready');
}