import type { UserConfig, ConfigEnv } from 'vite';
import pkg from './package.json';
import { format } from 'date-fns';
import { loadEnv } from 'vite';
import { resolve } from 'path';
import { generateModifyVars } from './build/generate/generateModifyVars';
import { createProxy } from './build/vite/proxy';
import { wrapperEnv } from './build/utils';
import { createVitePlugins } from './build/vite/plugin';
import { OUTPUT_DIR } from './build/constant';

function pathResolve(dir: string) {
  return resolve(process.cwd(), '.', dir);
}

const { dependencies, devDependencies, name, version } = pkg;
const __APP_INFO__ = {
  pkg: { dependencies, devDependencies, name, version },
  lastBuildTime: format(new Date(), 'yyyy-MM-dd HH:mm:ss'),
};

export default ({ command, mode }: ConfigEnv): UserConfig => {
  const root = process.cwd();
  const env = loadEnv(mode, root);
  const viteEnv = wrapperEnv(env);

  const { VITE_PORT, VITE_PUBLIC_PATH, VITE_PROXY, VITE_DROP_CONSOLE } = viteEnv;
  const isBuild = command === 'build';

  return {
    base: VITE_PUBLIC_PATH,
    root,
    resolve: {
      alias: [
        {
          find: 'vue-i18n',
          replacement: 'vue-i18n/dist/vue-i18n.cjs.js',
        },
        // /@/xxxx => src/xxxx
        {
          find: /\/@\//,
          replacement: pathResolve('src') + '/',
        },
        // /#/xxxx => types/xxxx
        {
          find: /\/#\//,
          replacement: pathResolve('types') + '/',
        },
      ],
    },
    plugins: createVitePlugins(viteEnv, isBuild),

    server: {
      // Listening on all local IPs
      host: true,
      port: VITE_PORT,
      // Load proxy configuration from .env
      proxy: createProxy(VITE_PROXY),
    },
    build: {
      target: 'es2015',
      cssTarget: 'chrome80',
      outDir: OUTPUT_DIR,

      minify: 'terser',
      terserOptions: {
        compress: {
          keep_infinity: true,
          drop_console: VITE_DROP_CONSOLE,
        },
      },

      // Turning off brotliSize display can slightly reduce packaging time
      brotliSize: false,
      sourcemap: false,
      chunkSizeWarningLimit: 2000,
    },
    define: {
      // setting vue-i18-next
      // Suppress warning
      __INTLIFY_PROD_DEVTOOLS__: false,
      __APP_INFO__: JSON.stringify(__APP_INFO__),
    },

    css: {
      preprocessorOptions: {
        less: {
          modifyVars: generateModifyVars(),
          javascriptEnabled: true,
        },
      },
    },
    optimizeDeps: {
      include: ['@iconify/iconify'],
    },
  };
};