import 'dart:io';

import 'package:flutter/material.dart';

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

/// App升级对话框
class UpgradeDialog extends StatefulWidget {
  final UpgradeInfo upgradeInfo;
  final VoidCallback? onCancel;
  final VoidCallback? onConfirm;
  final Color? primaryColor;

  const UpgradeDialog({super.key, required this.upgradeInfo, this.onCancel, this.onConfirm, this.primaryColor});

  /// 显示升级对话框
  static Future<bool?> show(BuildContext context, {required UpgradeInfo upgradeInfo, Color? primaryColor}) {
    return showDialog<bool>(
      context: context,
      barrierDismissible: !upgradeInfo.isForceUpdate,
      builder: (BuildContext context) {
        return UpgradeDialog(
          upgradeInfo: upgradeInfo,
          primaryColor: primaryColor,
        );
      },
    );
  }

  @override
  State<UpgradeDialog> createState() => _UpgradeDialogState();
}

class _UpgradeDialogState extends State<UpgradeDialog> {
  final AppUpgradePlugin _plugin = AppUpgradePlugin();
  bool _isDownloading = false;

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

    return WillPopScope(
      onWillPop: () async => !widget.upgradeInfo.isForceUpdate && !_isDownloading,
      child: Dialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            // 顶部图片或图标
            Container(
              height: 120,
              decoration: BoxDecoration(
                color: primaryColor,
                borderRadius: const BorderRadius.vertical(top: Radius.circular(16)),
              ),
              child: Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    const Icon(Icons.system_update, size: 48, color: Colors.white),
                    const SizedBox(height: 8),
                    Text(
                      '发现新版本 ${widget.upgradeInfo.versionName}',
                      style: const TextStyle(color: Colors.white, fontSize: 16, fontWeight: FontWeight.bold),
                    ),
                  ],
                ),
              ),
            ),

            // 更新内容
            Container(
              padding: const EdgeInsets.all(16),
              constraints: const BoxConstraints(maxHeight: 200),
              child: SingleChildScrollView(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text('更新内容：', style: TextStyle(fontSize: 14, fontWeight: FontWeight.bold)),
                    const SizedBox(height: 8),
                    Text(widget.upgradeInfo.updateContent, style: const TextStyle(fontSize: 14, height: 1.5)),
                  ],
                ),
              ),
            ),

            // 文件大小提示（如果有）
            if (widget.upgradeInfo.apkSize != null && Platform.isAndroid)
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16),
                child: Text(
                  '新版本大小：${formatBytes(widget.upgradeInfo.apkSize!)}',
                  style: TextStyle(fontSize: 12, color: Colors.grey[600]),
                ),
              ),

            const SizedBox(height: 16),

            // 按钮
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
              child: Row(
                children: [
                  if (!widget.upgradeInfo.isForceUpdate) ...[
                    Expanded(
                      child: TextButton(
                        onPressed: _isDownloading
                            ? null
                            : () {
                                widget.onCancel?.call();
                                Navigator.of(context).pop(false);
                              },
                        child: Text('稍后更新', style: TextStyle(color: Colors.grey[600])),
                      ),
                    ),
                    const SizedBox(width: 16),
                  ],
                  Expanded(
                    child: ElevatedButton(
                      onPressed: _isDownloading ? null : () => _handleConfirm(),
                      style: ElevatedButton.styleFrom(
                        backgroundColor: primaryColor,
                        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(24)),
                      ),
                      child: const Text('立即更新'),
                    ),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 8),
          ],
        ),
      ),
    );
  }

  void _handleConfirm() async {
    widget.onConfirm?.call();

    if (Platform.isAndroid) {
      // Android平台：下载并安装APK
      if (widget.upgradeInfo.downloadUrl != null) {
        setState(() {
          _isDownloading = true;
        });

        // 显示下载进度对话框
        final filePath = await DownloadProgressDialog.show(
          context,
          downloadUrl: widget.upgradeInfo.downloadUrl!,
          primaryColor: widget.primaryColor,
        );

        setState(() {
          _isDownloading = false;
        });

        if (filePath != null) {
          // 安装前再次检查并请求权限
          final hasInstallPermission = await PermissionHelper.checkAndRequestInstallPermission(context: context);
          if (!hasInstallPermission) {
            _showError('未授予安装权限，无法完成更新');
            return;
          }

          // 安装APK
          final success = await _plugin.installApk(filePath);
          if (success) {
            if (!widget.upgradeInfo.isForceUpdate) {
              Navigator.of(context).pop(true);
            }
          } else {
            _showError('安装失败，请检查权限设置');
          }
        }
      }
    } else if (Platform.isIOS) {
      // iOS平台：跳转到App Store
      if (widget.upgradeInfo.appStoreUrl != null) {
        final success = await _plugin.goToAppStore(widget.upgradeInfo.appStoreUrl!);
        if (success) {
          Navigator.of(context).pop(true);
        } else {
          _showError('跳转App Store失败');
        }
      }
    }
  }

  void _showError(String message) {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message), backgroundColor: Colors.red));
  }
}