From c428b51b5055d246a9e13436d2061fc3d20ecc02 Mon Sep 17 00:00:00 2001
From: Nate-Wessel <nate.wessel@toronto.ca>
Date: Mon, 15 Jul 2024 20:59:40 +0000
Subject: [PATCH] implement data-dependant date limits

---
 frontend/src/dateRange.js   | 17 ++++++++++++-----
 frontend/src/spatialData.js |  8 ++++++++
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/frontend/src/dateRange.js b/frontend/src/dateRange.js
index 96b90ed..d038f9a 100644
--- a/frontend/src/dateRange.js
+++ b/frontend/src/dateRange.js
@@ -7,8 +7,10 @@ import { DataContext } from './Layout'
 export class DateRange extends Factor {
     #startDate
     #endDate
+    #dataContext
     constructor(dataContext){
         super(dataContext)
+        this.#dataContext = dataContext
     }
     get isComplete(){
         return this.#startDate && this.#endDate && this.#startDate < this.#endDate
@@ -71,6 +73,14 @@ export class DateRange extends Factor {
         }
         return dayCount
     }
+    get maxDate(){
+        // default to today if actual max date not known (yet)
+        return this.#dataContext.dateRange.maxDate ?? new Date()
+    }
+    get minDate(){
+        // default to today if actual max date not known (yet)
+        return this.#dataContext.dateRange.minDate ?? new Date('2017-09-01')
+    }
 }
 
 function formatISODate(dt){ // this is waaay too complicated... alas
@@ -80,9 +90,6 @@ function formatISODate(dt){ // this is waaay too complicated... alas
     return `${year}-${('0'+month).slice(-2)}-${('0'+day).slice(-2)}`
 }
 
-const today = new Date()
-const earliestDataDate = new Date('2017-01-01')
-
 function DateRangeElement({dateRange}){
     const { logActivity } = useContext(DataContext)
     const [ selectedRange, setSelectedRange ] = useState(undefined)
@@ -102,8 +109,8 @@ function DateRangeElement({dateRange}){
                     selectRange={true}
                     allowPartialRange={true}
                     onChange={setSelectedRange}
-                    maxDate={today}
-                    minDate={earliestDataDate}
+                    maxDate={dateRange.maxDate}
+                    minDate={dateRange.minDate}
                 />
             </> }
         </div>
diff --git a/frontend/src/spatialData.js b/frontend/src/spatialData.js
index 1533af4..55c7c92 100644
--- a/frontend/src/spatialData.js
+++ b/frontend/src/spatialData.js
@@ -12,6 +12,7 @@ export class SpatialData {
     #factors = []
     #queries = new Map() // store/cache for travelTimeQueries, letting them remember their results if any
     #knownHolidays = []
+    #dataDateRange = { minDate: undefined, maxDate: undefined }
     #queue = new PQueue({concurrency: 3})
     constructor(){
         this.#factors.push(new Days(this))
@@ -19,6 +20,12 @@ export class SpatialData {
         fetch(`${domain}/holidays`)
             .then( response => response.json() )
             .then( holidayList => this.#knownHolidays = holidayList )
+        fetch(`${domain}/date-range`)
+            .then( response => response.json() )
+            .then( dates => {
+                this.#dataDateRange.minDate = new Date(dates.minDate)
+                this.#dataDateRange.maxDate = new Date(dates.maxDate)
+            } )
     }
     get corridors(){ return this.#factors.filter( f => f instanceof Corridor ) }
     get timeRanges(){ return this.#factors.filter( f => f instanceof TimeRange ) }
@@ -31,6 +38,7 @@ export class SpatialData {
         return this.corridors.find( cor => cor.isActive )
     }
     get holidays(){ return this.#knownHolidays }
+    get dateRange(){ return this.#dataDateRange }
     createCorridor(){
         let corridor = new Corridor(this)
         this.#factors.push(corridor)