import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import tailwindcss from "@tailwindcss/vite";
import { fileURLToPath, URL } from "node:url";

const host = process.env.TAURI_DEV_HOST;

// https://vitejs.dev/config/
export default defineConfig(async () => ({
  plugins: [react(), tailwindcss()],

  // Path resolution
  resolve: {
    alias: {
      "@": fileURLToPath(new URL("./src", import.meta.url)),
    },
  },

  // Vite options tailored for Tauri development and only applied in `tauri dev` or `tauri build`
  //
  // 1. prevent vite from obscuring rust errors
  clearScreen: false,
  // 2. tauri expects a fixed port, fail if that port is not available
  server: {
    port: 1420,
    strictPort: true,
    host: host || false,
    hmr: host
      ? {
          protocol: "ws",
          host,
          port: 1421,
        }
      : undefined,
    watch: {
      // 3. tell vite to ignore watching `src-tauri`
      ignored: ["**/src-tauri/**"],
    },
  },

  // Build configuration for code splitting
  build: {
    // Increase chunk size warning limit to 2000 KB
    chunkSizeWarningLimit: 2000,
    
    rollupOptions: {
      output: {
        // Manual chunks for better code splitting
        manualChunks: {
          // Vendor chunks
          'react-vendor': ['react', 'react-dom'],
          'ui-vendor': ['@radix-ui/react-dialog', '@radix-ui/react-dropdown-menu', '@radix-ui/react-select', '@radix-ui/react-tabs', '@radix-ui/react-tooltip', '@radix-ui/react-switch', '@radix-ui/react-popover'],
          'editor-vendor': ['@uiw/react-md-editor'],
          'syntax-vendor': ['react-syntax-highlighter'],
          // Tauri and other utilities
          'tauri': ['@tauri-apps/api', '@tauri-apps/plugin-dialog', '@tauri-apps/plugin-shell'],
          'utils': ['date-fns', 'clsx', 'tailwind-merge'],
        },
      },
    },
  },
}));