import 'package:flutter/material.dart';

import '../../data/models/app_update_model.dart';
import '../../services/update_service.dart';
import 'toast_helper.dart';

class UpdatePrompt extends StatefulWidget {
  final Widget child;

  const UpdatePrompt({super.key, required this.child});

  @override
  State<UpdatePrompt> createState() => _UpdatePromptState();
}

class _UpdatePromptState extends State<UpdatePrompt> {
  static bool _checkedThisRun = false;
  bool _dialogVisible = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) => _checkUpdate());
  }

  Future<void> _checkUpdate() async {
    if (_checkedThisRun || _dialogVisible || !mounted) return;
    _checkedThisRun = true;

    final update = await UpdateService.instance.checkForUpdate();
    if (update == null || !mounted) return;
    final shouldShow = await UpdateService.instance.shouldShowPrompt(update);
    if (!shouldShow || !mounted) return;

    _dialogVisible = true;
    try {
      await _showUpdateDialog(update);
    } finally {
      _dialogVisible = false;
    }
  }

  Future<void> _showUpdateDialog(AppUpdateInfo update) async {
    await showDialog<void>(
      context: context,
      barrierDismissible: false,
      builder: (dialogContext) {
        Future<void> openDownloadsPage() async {
          try {
            await UpdateService.instance.openDownloadsPage();
            if (dialogContext.mounted) Navigator.of(dialogContext).pop();
          } catch (e) {
            ToastHelper.failure('打开下载页面失败: $e');
          }
        }

        Future<void> skipPrompt() async {
          await UpdateService.instance.skipPromptForFiveDays(update);
          if (dialogContext.mounted) Navigator.of(dialogContext).pop();
        }

        final releaseNotes = (update.description ?? '').trim();

        return AlertDialog(
          title: Text('发现新版本 ${update.version}'),
          content: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 420, maxHeight: 360),
            child: SingleChildScrollView(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('新版本号：${update.version}'),
                  const SizedBox(height: 12),
                  Text(
                    '版本日志',
                    style: Theme.of(dialogContext).textTheme.titleSmall,
                  ),
                  const SizedBox(height: 6),
                  Text(releaseNotes.isEmpty ? update.title : releaseNotes),
                ],
              ),
            ),
          ),
          actions: [
            TextButton(onPressed: skipPrompt, child: const Text('跳过')),
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(),
              child: const Text('取消'),
            ),
            FilledButton(onPressed: openDownloadsPage, child: const Text('更新')),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) => widget.child;
}