import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import svgr from "vite-plugin-svgr";

// https://vite.dev/config/
export default defineConfig(({ mode }) => {
  const isDev = mode === "development";

  return {
    plugins: [
      react(),
      svgr({
        svgrOptions: {
          icon: true,
          // This will transform your SVG to a React component
          exportType: "named",
          namedExport: "ReactComponent",
        },
      }),
    ],
    // Optimize dependency pre-bundling
    optimizeDeps: {
      include: [
        'react-apexcharts',
        'apexcharts',
        'clsx',
        'tailwind-merge',
      ],
      exclude: [], // Don't exclude anything
      esbuildOptions: {
        // Increase timeout for large dependencies
        target: 'es2020',
      },
    },
    // Build configuration for code splitting
    build: {
      rollupOptions: {
        output: {
          // Manual chunk splitting for better code splitting
          manualChunks: (id) => {
            // Vendor chunks - separate large dependencies
            if (id.includes('node_modules')) {
              // React and React DOM together
              if (id.includes('react') || id.includes('react-dom') || id.includes('react-router')) {
                return 'vendor-react';
              }
              // Chart libraries
              if (id.includes('apexcharts') || id.includes('recharts')) {
                return 'vendor-charts';
              }
              // UI libraries
              if (id.includes('@radix-ui') || id.includes('framer-motion')) {
                return 'vendor-ui';
              }
              // Other large vendors
              return 'vendor';
            }
            // Page chunks - each page gets its own chunk
            if (id.includes('/pages/')) {
              const match = id.match(/\/pages\/([^/]+)/);
              if (match) {
                const pageName = match[1];
                // Group by module
                if (pageName === 'Planner' || id.includes('/Planner/')) {
                  return 'pages-planner';
                }
                if (pageName === 'Writer' || id.includes('/Writer/')) {
                  return 'pages-writer';
                }
                if (pageName === 'Thinker' || id.includes('/Thinker/')) {
                  return 'pages-thinker';
                }
                if (pageName === 'Settings' || id.includes('/Settings/')) {
                  return 'pages-settings';
                }
                if (pageName === 'Billing' || id.includes('/Billing/')) {
                  return 'pages-billing';
                }
                // Individual page chunks for others
                return `page-${pageName.toLowerCase()}`;
              }
            }
          },
          // Optimize chunk file names
          chunkFileNames: 'assets/js/[name]-[hash].js',
          entryFileNames: 'assets/js/[name]-[hash].js',
          assetFileNames: 'assets/[ext]/[name]-[hash].[ext]',
        },
      },
      // Increase chunk size warning limit (default is 500kb)
      chunkSizeWarningLimit: 1000,
      // Enable source maps in dev only
      sourcemap: isDev,
    },
    // Only configure server and HMR in development mode
    ...(isDev && {
      server: {
        host: "0.0.0.0", // Allow external connections (for Docker)
        port: 5173,
        strictPort: false, // Allow port fallback if 5173 is busy
        allowedHosts: [
          "app.igny8.com",
          "localhost",
          "127.0.0.1",
        ],
        watch: {
          usePolling: true, // Needed for file watching in Docker
        },
        hmr: {
          // Behind reverse proxy - use same origin strategy
          // Client connects via public domain (app.igny8.com) on default HTTPS port (443)
          // Caddy automatically proxies WebSocket upgrades from 443 to 5173
          protocol: "wss",
          // Don't specify host/port - Vite will use same origin as page
          // This ensures client connects to wss://app.igny8.com (port 443 implicit)
        },
        // Increase timeout for slow connections and dependency pre-bundling
        timeout: 120000, // 120 seconds (2 minutes) to match Caddy timeout
      },
    }),
  };
});