import path from 'node:path';
import { URL } from 'node:url';
import { defineConfig, loadEnv } from 'vite';
import react from '@vitejs/plugin-react';

function resolveBackendOrigin(env: Record<string, string>) {
  const raw = env.REACT_APP_API_BASE_URL || env.REACT_APP_API_URL || '';
  const fallback = 'http://127.0.0.1:8080';

  try {
    if (!raw || raw.startsWith('/')) {
      return fallback;
    }

    const parsed = new URL(raw);
    parsed.pathname = '/';
    parsed.search = '';
    parsed.hash = '';
    return parsed.toString();
  } catch {
    return fallback;
  }
}

function buildProcessEnv(mode: string, env: Record<string, string>, base: string) {
  const processEnv: Record<string, string> = {
    NODE_ENV: mode === 'production' ? 'production' : mode,
    PUBLIC_URL: base === '/' ? '' : base.replace(/\/$/, ''),
  };

  for (const [key, value] of Object.entries(env)) {
    if (key.startsWith('REACT_APP_')) {
      processEnv[key] = value;
    }
  }

  return processEnv;
}

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');
  const base = env.PUBLIC_URL ? (env.PUBLIC_URL.endsWith('/') ? env.PUBLIC_URL : `${env.PUBLIC_URL}/`) : '/';
  const backendOrigin = resolveBackendOrigin(env);
  const processEnv = buildProcessEnv(mode, env, base);
  const commonProxy = {
    target: backendOrigin,
    changeOrigin: true,
    secure: false,
  };

  return {
    base,
    publicDir: 'public',
    plugins: [react()],
    resolve: {
      alias: {
        '@': path.resolve(__dirname, 'src'),
      },
    },
    define: {
      'process.env': JSON.stringify(processEnv),
      global: 'globalThis',
    },
    build: {
      outDir: 'build',
      assetsDir: 'static',
      emptyOutDir: true,
      sourcemap: false,
    },
    server: {
      host: '0.0.0.0',
      port: 3000,
      proxy: {
        '/api': commonProxy,
        '/uploads': commonProxy,
        '/s': commonProxy,
        '/r': commonProxy,
        '/static': commonProxy,
        '/dist': commonProxy,
        '/cache': commonProxy,
        '/images': commonProxy,
        '/img': commonProxy,
        '/media': commonProxy,
        '/files': commonProxy,
        '/logos': commonProxy,
        '/avatars': commonProxy,
        '/downloads': commonProxy,
        '/public': commonProxy,
        '/favicon.ico': commonProxy,
      },
    },
    preview: {
      host: '0.0.0.0',
      port: 4173,
    },
    test: {
      environment: 'jsdom',
      globals: true,
      setupFiles: 'src/setupTests.ts',
    },
  };
});