import path from 'path'
import { defineConfig, HttpProxy, splitVendorChunkPlugin } from 'vite'
import react from '@vitejs/plugin-react'
import nodeResolve from '@rollup/plugin-node-resolve'
import postcss from './postcss.config'
import checker from 'vite-plugin-checker'

// https://vitejs.dev/config/
export default defineConfig(async ({ command }) => {
  const mdx = await import('@mdx-js/rollup').then(r => r.default)
  const rehypeHighlight = await import('rehype-highlight').then(r => r.default)

  return {
    define: {
      'process.env.GIT_COMMIT': JSON.stringify(process.env.GIT_COMMIT),
    },
    plugins: [
      react(),
      mdx({ rehypePlugins: [rehypeHighlight], remarkPlugins: [] }),
      nodeResolve(),
      splitVendorChunkPlugin(),
      command === 'build' ? checker({ typescript: true }) : undefined,
    ],
    css: {
      postcss,
    },
    server: {
      host: process.env.VITE_HOST === 'true' ? true : process.env.VITE_HOST,
      port: 3000,
      proxy: {
        '^/(api|health-check).*': {
          target: `http://localhost:3001`,
          changeOrigin: true,
          configure: configureProxy,
        },
        '^/websocket': {
          target: 'ws://localhost:3002',
          changeOrigin: true,
          configure: configureProxy,
        },
      },
      watch: {
        // prevent hot reloading when backend files change
        ignored: ['**/src/server/**/*.ts', '**/env.ts', '**/entry.ts'],
      },
    },
    resolve: {
      alias: [
        { find: 'node-fetch', replacement: 'cross-fetch' },
        { find: '~', replacement: path.resolve(__dirname, './src') },
        { find: 'src', replacement: path.resolve(__dirname, './src') },
        { find: 'env', replacement: path.resolve(__dirname, './env') },
      ],
    },
    build: {
      outDir: 'dist/client',
      assetsDir: 'app-assets',
    },
  }
})

function configureProxy(proxy: HttpProxy.Server) {
  proxy.removeAllListeners('error')

  proxy.on('error', err => {
    // experimental: silence ECONNREFUSED errors when Vite is ready but the backend hasn't started yet
    if (err.message.includes('ECONNREFUSED 127.0.0.1')) {
      return
    }
    console.error(err)
  })
}