import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'update_cubit.dart';
import 'update_state.dart';
import 'version_check_service.dart';

/// 更新对话框（带完整流程提示）
class UpdateDialog extends StatelessWidget {
  final AppVersionInfo versionInfo;

  const UpdateDialog({super.key, required this.versionInfo});

  @override
  Widget build(BuildContext context) {
    return BlocListener<UpdateCubit, UpdateState>(
      listener: (context, state) {
        if (state is UpdateSuccess) {
          Navigator.of(context).pop();

          if (versionInfo.updateType == 'patch') {
            _showRestartDialog(context);
          }
        } else if (state is UpdateFailure) {
          Navigator.of(context).pop();
          
          String errorMessage = state.error;
          bool showApkPath = false;
          String? apkPath;
          
          if (errorMessage.contains('APK 文件位于:')) {
            final parts = errorMessage.split('APK 文件位于:');
            if (parts.length > 1) {
              apkPath = parts[1].trim();
              showApkPath = true;
              errorMessage = '您取消了安装';
            }
          }
          
          _showErrorDialog(context, errorMessage, showApkPath: showApkPath, apkPath: apkPath);
        }
      },
      child: AlertDialog(
        title: const Text('发现新版本'),
        content: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('版本号: ${versionInfo.version}'),
              const SizedBox(height: 8),
              Text('更新类型: ${versionInfo.updateType == "patch" ? "差量更新" : "整包更新"}'),
              const SizedBox(height: 8),
              if (versionInfo.forceUpdate)
                Container(
                  padding: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.red.shade50,
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: const Text(
                    '⚠️ 强制更新',
                    style: TextStyle(color: Colors.red),
                  ),
                ),
              const SizedBox(height: 12),
              const Text('更新内容:', style: TextStyle(fontWeight: FontWeight.bold)),
              const SizedBox(height: 4),
              Text(versionInfo.updateDesc.isEmpty ? '优化用户体验，修复已知问题' : versionInfo.updateDesc),
            ],
          ),
        ),
        actions: [
          if (!versionInfo.forceUpdate)
            TextButton(
              onPressed: () {
                context.read<UpdateCubit>().cancelUpdate();
                Navigator.of(context).pop();
              },
              child: const Text('稍后'),
            ),
          BlocBuilder<UpdateCubit, UpdateState>(
            builder: (context, state) {
              if (state is UpdateDownloading) {
                return Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(
                      state.isPatch ? '⬇️ 正在下载补丁...' : '⬇️ 正在下载 APK...',
                      style: const TextStyle(fontSize: 13, fontWeight: FontWeight.bold),
                    ),
                    const SizedBox(height: 8),
                    SizedBox(
                      width: 60,
                      height: 60,
                      child: Stack(
                        alignment: Alignment.center,
                        children: [
                          CircularProgressIndicator(
                            value: state.progress,
                            strokeWidth: 3,
                          ),
                          Text('${(state.progress * 100).toInt()}%'),
                        ],
                      ),
                    ),
                  ],
                );
              } else if (state is UpdateClearingVersion) {
                return const Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text('✅ 版本号清理完成', style: TextStyle(fontSize: 13, fontWeight: FontWeight.bold)),
                    SizedBox(height: 4),
                    Text('正在调起安装页面...', style: TextStyle(fontSize: 12)),
                    SizedBox(height: 8),
                    CircularProgressIndicator(),
                  ],
                );
              } else if (state is UpdateReadyToInstall) {
                return ElevatedButton.icon(
                  onPressed: () {
                    context.read<UpdateCubit>().triggerInstall(state.apkPath);
                  },
                  icon: const Icon(Icons.install_mobile),
                  label: const Text('去安装'),
                );
              } else if (state is UpdateInstalling) {
                return const Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text('📦 正在打开安装页面...', style: TextStyle(fontSize: 13, fontWeight: FontWeight.bold)),
                    SizedBox(height: 4),
                    Text('请在系统安装界面确认安装', style: TextStyle(fontSize: 12)),
                    SizedBox(height: 8),
                    CircularProgressIndicator(),
                  ],
                );
              } else {
                return ElevatedButton(
                  onPressed: () {
                    if (versionInfo.updateType == 'patch' && versionInfo.patchUrl != null) {
                      context.read<UpdateCubit>().applyPatch(
                            versionInfo.patchUrl!,
                            versionInfo.version,
                            versionInfo.versionCode,
                            md5: versionInfo.patchMd5,
                          );
                    } else if (versionInfo.apkUrl != null) {
                      context.read<UpdateCubit>().downloadAndInstallApk(versionInfo.apkUrl!);
                    }
                  },
                  child: const Text('立即更新'),
                );
              }
            },
          ),
        ],
      ),
    );
  }

  void _showRestartDialog(BuildContext context) {
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (ctx) => AlertDialog(
        title: const Text('更新完成'),
        content: const Text('差量更新已应用，需要重启应用才能生效。\n是否立即重启？'),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(ctx).pop(),
            child: const Text('稍后'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.of(ctx).pop();
              SystemNavigator.pop();
            },
            child: const Text('立即重启'),
          ),
        ],
      ),
    );
  }

  void _showErrorDialog(BuildContext context, String message, {bool showApkPath = false, String? apkPath}) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('更新提示'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(message),
            if (showApkPath && apkPath != null) ...[
              const SizedBox(height: 12),
              Container(
                padding: const EdgeInsets.all(10),
                decoration: BoxDecoration(
                  color: Colors.blue.shade50,
                  borderRadius: BorderRadius.circular(6),
                  border: Border.all(color: Colors.blue.shade200),
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text(
                      '📁 APK 文件位置',
                      style: TextStyle(fontWeight: FontWeight.bold, fontSize: 13),
                    ),
                    const SizedBox(height: 6),
                    Text(
                      apkPath,
                      style: const TextStyle(fontSize: 11, fontFamily: 'monospace'),
                    ),
                    const SizedBox(height: 6),
                    const Text(
                      '您可以到该目录手动点击 APK 文件进行安装',
                      style: TextStyle(fontSize: 11, color: Colors.grey),
                    ),
                  ],
                ),
              ),
            ],
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(ctx).pop(),
            child: const Text('确定'),
          ),
        ],
      ),
    );
  }
}

/// 显示整包更新提示（在浏览器中下载）
class FullApkUpdateDialog extends StatelessWidget {
  final AppVersionInfo versionInfo;

  const FullApkUpdateDialog({super.key, required this.versionInfo});

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: const Text('发现新版本'),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('版本号: ${versionInfo.version}'),
            const SizedBox(height: 8),
            const Text('更新类型: 整包更新'),
            const SizedBox(height: 12),
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Colors.blue.shade50,
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.blue.shade200),
              ),
              child: const Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    '📱 整包更新说明',
                    style: TextStyle(fontWeight: FontWeight.bold, fontSize: 14),
                  ),
                  SizedBox(height: 8),
                  Text(
                    '• 点击"立即下载"将在浏览器中打开下载链接\n'
                    '• 下载完成后请手动安装 APK\n'
                    '• 安装完成后重启应用即可',
                    style: TextStyle(fontSize: 13, height: 1.5),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 12),
            if (versionInfo.updateDesc.isNotEmpty) ...[
              const Text('更新内容:', style: TextStyle(fontWeight: FontWeight.bold)),
              const SizedBox(height: 4),
              Text(versionInfo.updateDesc),
            ],
          ],
        ),
      ),
      actions: [
        if (!versionInfo.forceUpdate)
          TextButton(
            onPressed: () {
              context.read<UpdateCubit>().cancelUpdate();
              Navigator.of(context).pop();
            },
            child: const Text('稍后'),
          ),
        ElevatedButton(
          onPressed: () {
            if (versionInfo.apkUrl != null) {
              context.read<UpdateCubit>().downloadAndInstallApk(versionInfo.apkUrl!);
              Navigator.of(context).pop();
              
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(
                  content: Text('正在浏览器中打开下载链接...'),
                  duration: Duration(seconds: 2),
                ),
              );
            }
          },
          child: const Text('立即下载'),
        ),
      ],
    );
  }
}