background.js

// 3D Viewer by SceneView — Background Service Worker
// Handles context menu creation and viewer tab opening

const MODEL_EXTENSIONS = ['.glb', '.gltf', '.usdz'];
const CONTEXT_MENU_ID = 'sceneview-preview-3d';

// Create context menu on install
chrome.runtime.onInstalled.addListener(() => {
  chrome.contextMenus.create({
    id: CONTEXT_MENU_ID,
    title: 'Preview in 3D',
    contexts: ['link'],
    targetUrlPatterns: [
      '*://*/*.glb*',
      '*://*/*.gltf*',
      '*://*/*.usdz*',
      '*://*/*.GLB*',
      '*://*/*.GLTF*',
      '*://*/*.USDZ*',
    ],
  });

  // Set default settings
  chrome.storage.local.get(['theme'], (result) => {
    if (!result.theme) {
      chrome.storage.local.set({ theme: 'dark' });
    }
  });
});

// Handle context menu click
chrome.contextMenus.onClicked.addListener((info, tab) => {
  if (info.menuItemId === CONTEXT_MENU_ID && info.linkUrl) {
    openViewer(info.linkUrl);
  }
});

// Handle messages from content script
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
  if (message.action === 'openViewer' && message.url) {
    openViewer(message.url);
    sendResponse({ success: true });
  }
  if (message.action === 'getTheme') {
    chrome.storage.local.get(['theme'], (result) => {
      sendResponse({ theme: result.theme || 'dark' });
    });
    return true; // async response
  }
  if (message.action === 'setTheme') {
    chrome.storage.local.set({ theme: message.theme });
    sendResponse({ success: true });
  }
});

function openViewer(modelUrl) {
  const viewerUrl = chrome.runtime.getURL('viewer.html') + '?model=' + encodeURIComponent(modelUrl);
  chrome.tabs.create({ url: viewerUrl });
}