/// <reference types="vitest" />
/// <reference types="vite/client" />

import { defineConfig, loadEnv, UserConfig, ConfigEnv } from 'vite';
import react from '@vitejs/plugin-react';
import process from 'node:process';
import { VitePWA } from 'vite-plugin-pwa';

export default defineConfig(async ({ mode }: ConfigEnv): Promise<UserConfig> => {
  // Load env file based on mode in correct order
  const env = loadEnv(mode, process.cwd(), 'VITE_');
  
  // Determine base URL from hostname
  const base = '/';  // Always use root path, let nginx handle the routing
  
  // Determine if we're in production based on mode and VITE_DEV flag
  const isProd = mode === 'production' && env.VITE_DEV !== 'true';

  return {
    plugins: [
      react(),
      VitePWA({
        strategies: 'injectManifest',
        srcDir: 'src',
        filename: 'sw.ts',
        registerType: 'prompt',
        injectRegister: 'auto',
        devOptions: {
          enabled: false,
          type: 'module'
        },
        manifest: {
          name: 'ClassroomCopilot',
          short_name: 'CC',
          start_url: base,
          scope: base,
          display: 'fullscreen',
          background_color: '#ffffff',
          theme_color: '#000000',
          icons: [
            {
              src: '/icons/icon-192x192.png',
              sizes: '192x192',
              type: 'image/png',
              purpose: 'any'
            },
            {
              src: '/icons/icon-512x512.png',
              sizes: '512x512',
              type: 'image/png',
              purpose: 'any'
            },
            {
              src: '/icons/icon-192x192-maskable.png',
              sizes: '192x192',
              type: 'image/png',
              purpose: 'maskable'
            },
            {
              src: '/icons/icon-512x512-maskable.png',
              sizes: '512x512',
              type: 'image/png',
              purpose: 'maskable'
            }
          ]
        },
        includeAssets: ['favicon.ico', 'icons/*.png'],
        injectManifest: {
          globPatterns: [
            'index.html',
            '**/*.{js,css,html,ico,png,svg,json}',
            'manifest.webmanifest'
          ],
          maximumFileSizeToCacheInBytes: 8 * 1024 * 1024, // 8MB
          dontCacheBustURLsMatching: /\.[0-9a-f]{8}\./,
          // Exclude development resources and source files
          globIgnores: [
            '**/node_modules/**/*',
            'sw.js',
            'workbox-*.js',
            '**/*.map',
            '**/vite/**/*',
            '**/@vite/**/*',
            '**/@react-refresh/**/*'
          ],
          // Ensure service worker has correct scope
          swDest: 'dist/sw.js',
          manifestTransforms: [
            // Transform manifest entries to ensure proper caching
            (entries) => ({
              manifest: entries.map(entry => ({
                ...entry,
                url: entry.url.startsWith(base) ? entry.url : `${base}${entry.url.startsWith('/') ? entry.url.slice(1) : entry.url}`
              }))
            })
          ]
        }
      })
    ],
    define: {
      // Make env variables available globally
      'process.env': env,
      // Ensure import.meta.env has our variables
      'import.meta.env.VITE_FRONTEND_SITE_URL': JSON.stringify(env.VITE_FRONTEND_SITE_URL),
      'import.meta.env.VITE_SUPABASE_URL': JSON.stringify(env.VITE_SUPABASE_URL),
      'import.meta.env.VITE_SUPABASE_ANON_KEY': JSON.stringify(env.VITE_SUPABASE_ANON_KEY),
      'import.meta.env.VITE_SUPER_ADMIN_EMAIL': JSON.stringify(env.VITE_SUPER_ADMIN_EMAIL),
      'import.meta.env.VITE_DEV': env.VITE_DEV === 'true',
    },
    envPrefix: 'VITE_',
    base,
    server: {
      host: '0.0.0.0',
      port: parseInt(env.VITE_PORT_FRONTEND || '5173'),
      watch: {
        usePolling: env.VITE_DEV === 'true',
        ignored: ['**/node_modules/**', '**/dist/**']
      },
      allowedHosts: [
        `app.${env.VITE_FRONTEND_SITE_URL}`,
      ],
      hmr: isProd ? false : {
        protocol: env.VITE_DEV === 'true' ? 'ws' : 'wss',
        host: env.VITE_DEV == 'true' ? 'localhost' : env.VITE_APP_HMR_URL,
        port: parseInt(env.VITE_PORT_FRONTEND || '5173'),
        clientPort: parseInt(env.VITE_PORT_FRONTEND_HMR || '5173'),
        overlay: false
      }
    },
    clearScreen: false,
    optimizeDeps: {
      force: true,
      include: ['react', 'react-dom', '@mui/material', '@tldraw/tldraw']
    },
    build: {
      sourcemap: !isProd,
      manifest: true,
      minify: isProd ? 'terser' : false,
      terserOptions: isProd ? {
        compress: {
          drop_debugger: true
        }
      } : undefined,
      rollupOptions: {
        output: {
          manualChunks: {
            'vendor-react': ['react', 'react-dom', 'react-router-dom'],
            'vendor-mui': ['@mui/material', '@mui/icons-material'],
            'vendor-tldraw': ['@tldraw/tldraw', '@tldraw/store', '@tldraw/tlschema'],
            'vendor-utils': ['axios', 'zustand', '@supabase/supabase-js']
          },
          // Ensure chunk filenames include content hash
          chunkFileNames: isProd ? 'assets/[name].[hash].js' : 'assets/[name].js',
          assetFileNames: isProd ? 'assets/[name].[hash][extname]' : 'assets/[name][extname]'
        },
        // Externalize dependencies that shouldn't be bundled
        external: isProd ? [] : [/^@vite/, /^@react-refresh/]
      },
      chunkSizeWarningLimit: 2000,
      // Enable module concatenation for better minification
      target: 'esnext',
      cssCodeSplit: true,
      assetsInlineLimit: 4096, // 4kb
      modulePreload: true,
      reportCompressedSize: !isProd
    },
    // Add esbuild optimization
    esbuild: {
      drop: isProd ? ['debugger'] : [],
      legalComments: 'none',
      target: ['esnext']
    }
  };
});