import { defineConfig } from 'vite';
import { resolve } from 'path';
import electron from 'vite-plugin-electron';
import renderer from 'vite-plugin-electron-renderer';
import react from '@vitejs/plugin-react';
import tailwindcss from '@tailwindcss/vite';
import electronBytecode from './plugins/bytenode/vite-plugin-electron-encrypt';

const projectAliases = {
  "@src": resolve(__dirname, "./src"),
  "@runtime": resolve(__dirname, "./runtime-shared"),
  "@electron": resolve(__dirname, "./electron"),
  "@service": resolve(__dirname, "./electron/service"),
};

function isMainProcessExternal(id: string): boolean {
  if (!id || id.startsWith('\0')) return false;
  if (id.startsWith('.') || id.startsWith('/') || /^[A-Za-z]:[\\/]/.test(id)) return false;
  
  // Project-specific aliases that should be bundled (not external)
  const internalAliases = [
    '@src/', '@electron/', '@runtime/', '@service/',
  ];
  
  // Check if the ID starts with any internal alias
  for (const alias of internalAliases) {
    if (id.startsWith(alias)) return false;
  }
  
  // Externalize @electron/ packages and other @scoped packages
  if (id.startsWith('@/') || id.startsWith('@electron/')) return false;
  
  // Externalize all other modules (npm packages)
  return true;
}

// https://vitejs.dev/config/
export default defineConfig(({ mode }) => {
  // Determine if we're in development mode
  const isDev = mode === 'development';
  
  // Development server URL - in dev mode, this will be the Vite dev server URL
  // In production, this should be undefined
  // Prefer VITE_DEV_SERVER_URL environment variable if set (e.g., when port is auto-selected)
  const devServerUrl = isDev 
    ? (process.env.VITE_DEV_SERVER_URL || 'http://localhost:5173')
    : undefined;
  
  return {
    // Required for Electron: all asset URLs must be relative because the renderer
    // loads via file:// in production. vite-plugin-electron-renderer sets this
    // automatically, but we declare it explicitly so the intent is clear.
    base: './',
    
    plugins: [
      react(),
      tailwindcss(),
      electron([
        {
          // Main process entry file
          entry: 'electron/main.ts',
          onstart(options) {
            options.startup();
          },
          vite: {
            plugins: [electronBytecode()],
            define: {
              // Inject the dev server URL for use in main process
              MAIN_WINDOW_VITE_DEV_SERVER_URL: JSON.stringify(devServerUrl),
              'process.env.VITE_SERVICE_URL': JSON.stringify(process.env.VITE_SERVICE_URL || 'http://8.138.234.141/ingress'),
            },
            resolve: {
              alias: projectAliases,
            },
            build: {
              outDir: 'dist-electron/main',
              rollupOptions: {
                external: isMainProcessExternal,
              },
              watch: isDev
                ? {
                    exclude: ['**/electron/scripts/**', '**/scripts.meta.json'],
                  }
                : undefined,
            },
          },
        },
        {
          // Preload scripts entry file
          entry: 'electron/preload/index.ts',
          onstart(options) {
            options.reload();
          },
          vite: {
            build: {
              outDir: 'dist-electron/preload',
              rollupOptions: {
                external: ['electron'],
                output: {
                  entryFileNames: 'preload.js',
                },
              },
              watch: isDev
                ? {
                    exclude: ['**/electron/scripts/**', '**/scripts.meta.json'],
                  }
                : undefined,
            },
            resolve: {
              alias: projectAliases,
            },
          },
        },
      ]),
      renderer(),
    ],

    css: {
      transformer: 'lightningcss',
    },
    
    resolve: {
      alias: projectAliases,
    },

    server: {
      port: 5173,
      watch: {
        ignored: ['**/electron/scripts/**', '**/scripts.meta.json'],
      },
      proxy: {
        '/ingress': {
          target: 'http://8.138.234.141',
          changeOrigin: true,
        },
      },
    },
    
    build: {
      outDir: 'dist',
      emptyOutDir: true,
    },
  }
});