import 'dart:io';
import 'dart:convert';

void main(List<String> arguments) async {
  print('🚀 开始构建Flutter Android应用...');

  // 默认构建 ARM64 + ARM32（推荐）
  final targetPlatform = arguments.contains('--arm64-only')
      ? 'android-arm64'
      : 'android-arm64,android-arm';

  try {
    // 检查Flutter环境
    await checkFlutterEnvironment();

    // 构建Flutter Android应用
    final apkPath = await buildFlutterApp(targetPlatform);

    // 生成version.json文件
    await generateVersionJson(apkPath, targetPlatform);

    print('✅ 构建完成！');
    print('📦 APK位置: $apkPath');
  } catch (e) {
    print('❌ 构建过程中出现错误: $e');
    exit(1);
  }
}

Future<String> buildFlutterApp(String targetPlatform) async {
  print('📱 正在构建Flutter Android应用...');
  print('🎯 目标平台: $targetPlatform');

  // 清理构建缓存
  print('🧹 清理构建缓存...');
  await runFlutterCommand(['clean']);

  // 获取pub依赖
  print('📦 获取依赖...');
  await runFlutterCommand(['pub', 'get']);

  // 构建APK（指定目标平台）
  print('🔨 构建Release APK...');
  await runFlutterCommand([
    'build',
    'apk',
    '--release',
    '--target-platform=$targetPlatform',
  ]);

  print('✅ Flutter应用构建成功！');

  // 根据目标平台生成对应的APK文件名
  String apkName;
  if (targetPlatform == 'android-arm64') {
    apkName = 'app-arm64-release.apk';
  } else if (targetPlatform == 'android-arm') {
    apkName = 'app-arm-release.apk';
  } else {
    apkName = 'app-release.apk';
  }

  return 'build/app/outputs/flutter-apk/$apkName';
}

Future<void> runFlutterCommand(List<String> args) async {
  final result = await Process.run('flutter', args, runInShell: true);
  if (result.exitCode != 0) {
    throw Exception('Flutter命令执行失败: ${result.stderr}');
  }
}

Future<void> generateVersionJson(String apkPath, String targetPlatform) async {
  print('📄 正在生成version.json文件...');

  final apkFile = File(apkPath);
  String fileSize = '未知';

  if (await apkFile.exists()) {
    final apkSize = await apkFile.length();
    fileSize = '${(apkSize / (1024 * 1024)).toStringAsFixed(1)}MB';
    print('📦 APK文件大小: $fileSize');
  }

  final now = DateTime.now();
  final buildTime =
      '${now.year}-${now.month.toString().padLeft(2, '0')}-${now.day.toString().padLeft(2, '0')} ${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}';

  final versionInfo = {
    "version": "1.0.1",
    "build_number": getBuildNumber(),
    "build_time": buildTime,
    "target_platform": targetPlatform,
    "file_size": fileSize,
    "url": "http://xhota.anxincloud.cn/problem/app-release.apk",
    "description": "1. 修复了xxx bug。\n2. 新增了xxx功能。\n3. 优化了用户体验。",
    "platform": "android",
  };

  final jsonFile = File('build/app/outputs/flutter-apk/version.json');
  await jsonFile.writeAsString(
    const JsonEncoder.withIndent('  ').convert(versionInfo),
  );

  print('✅ version.json文件生成成功！');
}

String getBuildNumber() {
  final now = DateTime.now();
  return '${now.year}${now.month.toString().padLeft(2, '0')}${now.day.toString().padLeft(2, '0')}${now.hour.toString().padLeft(2, '0')}${now.minute.toString().padLeft(2, '0')}';
}

Future<void> checkFlutterEnvironment() async {
  final result = await Process.run('flutter', ['--version'], runInShell: true);
  if (result.exitCode != 0) {
    throw Exception('Flutter环境检查失败');
  }
  print('✅ Flutter环境正常');
}