import path from 'node:path';
import type { ServerResponse } from 'node:http';

import react from '@vitejs/plugin-react';
import { defineConfig, loadEnv, type PluginOption } from 'vite';

import packageJson from './package.json';

const platformExtensions = [
  '.web.tsx',
  '.web.ts',
  '.tsx',
  '.ts',
  '.web.jsx',
  '.web.js',
  '.jsx',
  '.js',
  '.json',
];

const frontendHealthStartedAt = Date.now();
const frontendHealthStartedAtIso = new Date(
  frontendHealthStartedAt,
).toISOString();

function createFrontendHealthPayload() {
  return {
    ok: true,
    service: 'blb-frontend',
    version: packageJson.version,
    startedAt: frontendHealthStartedAtIso,
    timestamp: new Date().toISOString(),
    uptimeSeconds: Math.max(
      0,
      Math.round((Date.now() - frontendHealthStartedAt) / 1000),
    ),
  };
}

function writeJsonResponse(
  response: ServerResponse,
  statusCode: number,
  body: object,
) {
  response.writeHead(statusCode, {
    'Cache-Control': 'no-store',
    'Content-Type': 'application/json',
  });
  response.end(`${JSON.stringify(body)}\n`);
}

function frontendHealthPlugin(): PluginOption {
  return {
    name: 'blb-frontend-health',
    configurePreviewServer(server) {
      server.middlewares.use((request, response, next) => {
        if (request.url?.split('?')[0] !== '/health') {
          next();
          return;
        }

        writeJsonResponse(response, 200, createFrontendHealthPayload());
      });
    },
    configureServer(server) {
      server.middlewares.use((request, response, next) => {
        if (request.url?.split('?')[0] !== '/health') {
          next();
          return;
        }

        writeJsonResponse(response, 200, createFrontendHealthPayload());
      });
    },
  };
}

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, __dirname, '');
  const toolkitSocketUrl =
    env.VITE_TOOLKIT_SOCKET_URL ?? env.TOOLKIT_SOCKET_URL ?? '';

  return {
    define: {
      __TOOLKIT_SOCKET_URL__: JSON.stringify(toolkitSocketUrl),
      'import.meta.env.VITE_APP_VERSION': JSON.stringify(packageJson.version),
    },
    plugins: [frontendHealthPlugin(), react()],
    resolve: {
      alias: [{ find: /^react-native$/, replacement: 'react-native-web' }],
      dedupe: ['react', 'react-dom', 'react-native-web'],
      extensions: platformExtensions,
    },
    optimizeDeps: {
      exclude: ['react-native-safe-area-context'],
    },
    build: {
      outDir: path.resolve(__dirname, 'dist/renderer'),
      emptyOutDir: true,
    },
    server: {
      host: '127.0.0.1',
      port: 5173,
    },
  };
});