import 'package:flutter/material.dart';

import '../app_upgrade_plugin.dart';
import '../core/upgrade_utils.dart';

/// 下载进度对话框
class DownloadProgressDialog extends StatefulWidget {
  final String downloadUrl;
  final Color? primaryColor;

  const DownloadProgressDialog({super.key, required this.downloadUrl, this.primaryColor});

  /// 显示下载进度对话框
  static Future<String?> show(BuildContext context, {required String downloadUrl, Color? primaryColor}) {
    return showDialog<String?>(
      context: context,
      barrierDismissible: false,
      builder: (context) => DownloadProgressDialog(downloadUrl: downloadUrl, primaryColor: primaryColor),
    );
  }

  @override
  State<DownloadProgressDialog> createState() => _DownloadProgressDialogState();
}

class _DownloadProgressDialogState extends State<DownloadProgressDialog> {
  final AppUpgradePlugin _plugin = AppUpgradePlugin();

  double _progress = 0.0;
  String _progressText = '准备下载...';
  int _received = 0;
  int _total = 0;
  bool _isDownloading = false;
  String? _errorMessage;

  @override
  void initState() {
    super.initState();
    _startDownload();
  }

  @override
  Widget build(BuildContext context) {
    final primaryColor = widget.primaryColor ?? Theme.of(context).primaryColor;

    return WillPopScope(
      onWillPop: () async => false,
      child: Dialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              // 图标
              Icon(
                _errorMessage != null ? Icons.error_outline : Icons.download_rounded,
                size: 48,
                color: _errorMessage != null ? Colors.red : primaryColor,
              ),
              const SizedBox(height: 16),

              // 标题
              Text(
                _errorMessage != null ? '下载失败' : '正在下载更新',
                style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 16),

              if (_errorMessage != null) ...[
                // 错误信息
                Text(
                  _errorMessage!,
                  style: TextStyle(fontSize: 14, color: Colors.grey[600]),
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 16),

                // 按钮
                Row(
                  children: [
                    Expanded(
                      child: TextButton(
                        onPressed: () {
                          Navigator.of(context).pop(null);
                        },
                        child: const Text('取消'),
                      ),
                    ),
                    const SizedBox(width: 16),
                    Expanded(
                      child: ElevatedButton(
                        onPressed: () {
                          setState(() {
                            _errorMessage = null;
                            _progress = 0.0;
                            _progressText = '准备下载...';
                          });
                          _startDownload();
                        },
                        style: ElevatedButton.styleFrom(backgroundColor: primaryColor),
                        child: const Text('重试'),
                      ),
                    ),
                  ],
                ),
              ] else ...[
                // 进度条
                LinearProgressIndicator(
                  value: _isDownloading ? _progress : null,
                  backgroundColor: Colors.grey[300],
                  valueColor: AlwaysStoppedAnimation<Color>(primaryColor),
                ),
                const SizedBox(height: 12),

                // 进度文本
                Text(_progressText, style: TextStyle(fontSize: 14, color: Colors.grey[600])),
                const SizedBox(height: 8),

                // 文件大小信息
                if (_total > 0)
                  Text(
                    '${formatBytes(_received)} / ${formatBytes(_total)}',
                    style: TextStyle(fontSize: 12, color: Colors.grey[500]),
                  ),
              ],
            ],
          ),
        ),
      ),
    );
  }

  Future<void> _startDownload() async {
    setState(() {
      _isDownloading = true;
      _errorMessage = null;
    });

    try {
      final filePath = await _plugin.downloadApk(
        widget.downloadUrl,
        onProgress: (progress) {
          setState(() {
            _progress = progress.progress;
            _received = progress.received;
            _total = progress.total;
            _progressText = '下载中 ${progress.percentage}%';
          });
        },
      );

      if (filePath != null) {
        setState(() {
          _progressText = '下载完成';
        });

        // 延迟一下让用户看到完成状态
        await Future.delayed(const Duration(milliseconds: 500));

        // 返回文件路径
        if (mounted) {
          Navigator.of(context).pop(filePath);
        }
      } else {
        setState(() {
          _errorMessage = '下载失败，请检查网络连接';
          _isDownloading = false;
        });
      }
    } catch (e) {
      setState(() {
        _errorMessage = '下载出错：${e.toString()}';
        _isDownloading = false;
      });
    }
  }
}