import 'dart:async';
import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:recording_tool/app/router/app_navigator.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';
import 'package:webview_flutter_wkwebview/webview_flutter_wkwebview.dart';

class WebviewPage extends StatefulWidget {
  final String? url;
  final String? title;
  final String? assetPath;
  final bool? canPop;

  const WebviewPage({
    super.key,
    this.url,
    this.title,
    this.assetPath,
    this.canPop,
  });

  @override
  State<WebviewPage> createState() => WebviewPageState();
}

class WebviewPageState extends State<WebviewPage> {
  static const String _javaScriptChannelName = 'AppBridge';

  WebViewController? _controller;
  bool _isLoading = true;
  String? _errorMessage;

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

  @override
  void dispose() {
    final controller = _controller;
    _controller = null;
    if (controller != null) {
      unawaited(_disposeWebViewController(controller));
    }
    super.dispose();
  }

  Future<void> _initController() async {
    if ((widget.url?.isEmpty ?? true) && widget.assetPath == null) {
      return;
    }
    final params = _createPlatformParams();
    late final WebViewController controller;
    controller = WebViewController.fromPlatformCreationParams(params)
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setBackgroundColor(Colors.transparent)
      ..setNavigationDelegate(
        NavigationDelegate(
          onProgress: (int progress) {
            debugPrint('webview - progress: $progress');
          },
          onPageStarted: (String url) {
            debugPrint('webview - page started: $url');
            if (!mounted) return;
            setState(() {
              _isLoading = true;
              _errorMessage = null;
            });
          },
          onPageFinished: (String url) async {
            debugPrint('webview - page finished: $url');
            // await _injectPostMessageBridge(controller);
            await _injectH5NeedData(controller);
            if (!mounted) return;
            setState(() => _isLoading = false);
          },
          onHttpError: (HttpResponseError error) {
            debugPrint(
              'webview - http error: ${error.response?.uri}, code: ${error.response?.statusCode}',
            );
          },
          onWebResourceError: (WebResourceError error) {
            debugPrint(
              'webview error: ${error.description}, code: ${error.errorCode}, url: ${error.url}',
            );
            if (!mounted || error.isForMainFrame != true) return;
            setState(() {
              _isLoading = false;
              _errorMessage = error.description;
            });
          },
          onNavigationRequest: (NavigationRequest request) {
            return NavigationDecision.navigate;
          },
        ),
      );

    controller.addJavaScriptChannel(
      _javaScriptChannelName,
      onMessageReceived: (JavaScriptMessage message) {
        _onMessageReceived(message);
      },
    );

    if (controller.platform is AndroidWebViewController) {
      AndroidWebViewController.enableDebugging(kDebugMode);
      await (controller.platform as AndroidWebViewController)
          .setMediaPlaybackRequiresUserGesture(false);
    }

    try {
      if (widget.assetPath != null) {
        await controller.loadFlutterAsset(widget.assetPath!);
      } else {
        final targetUrl = widget.url ?? '';
        await controller.loadRequest(Uri.parse(targetUrl));
      }
    } catch (e) {
      debugPrint('webview - load failed: $e');
      if (!mounted) return;
      setState(() {
        _isLoading = false;
        _errorMessage = e.toString();
      });
      return;
    }

    if (!mounted) {
      unawaited(_disposeWebViewController(controller));
      return;
    }
    setState(() => _controller = controller);
  }

  Future<void> _disposeWebViewController(WebViewController controller) async {
    await _runWebViewCleanupStep(
      'reset navigation delegate',
      () => controller.setNavigationDelegate(NavigationDelegate()),
    );
    await _runWebViewCleanupStep(
      'remove javascript channel',
      () => controller.removeJavaScriptChannel(_javaScriptChannelName),
    );
    await _runWebViewCleanupStep(
      'load blank page',
      () => controller.loadRequest(Uri.parse('about:blank')),
    );
    await _runWebViewCleanupStep('clear cache', controller.clearCache);
    await _runWebViewCleanupStep(
      'clear local storage',
      controller.clearLocalStorage,
    );
    await _runWebViewCleanupStep(
      'clear cookies',
      () => WebViewCookieManager().clearCookies(),
    );
  }

  Future<void> _runWebViewCleanupStep(
    String step,
    Future<void> Function() cleanup,
  ) async {
    try {
      debugPrint('webview - dispose cleanup  at $step ');

      await cleanup();
    } catch (e) {
      debugPrint('webview - dispose cleanup failed at $step: $e');
    }
  }

  void _onMessageReceived(JavaScriptMessage message) {
    debugPrint('收到来自 WebView 的消息: ${message.message}');
    final jsonMap = json.decode(message.message);
    if (jsonMap['type'] != null && jsonMap['type'] == 'navigator_pop') {
      Navigator.of(context).maybePop();
    }
  }

  /// 脚本注入传输给h5 数据
  Future<void> _injectH5NeedData(WebViewController controller) async {
    final token =
        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOjgxNDI4NTczNTY2NjY4ODAwLCJkYXRhIjp7fSwic3ViIjoiODE0Mjg1NzM1NjY2Njg4MDAiLCJleHAiOjE3ODM5MzM1ODQsIm5iZiI6MTc4MzMyODc4NCwiaWF0IjoxNzgzMzI4Nzg0fQ.r1wYfvpV-5HIgwUuvq1Or3jPgjc3AhfJmoV1PNP23-Y';
    try {
      await controller.runJavaScript('''
      (function () {
        if (window.__appInstallData) {
            return;
        }
        window.__appInstallData = ${true};

        window.AppBridge.token = '$token';

        })();
      ''');
    } catch (e) {
      debugPrint('webview - inject postMessage bridge failed: $e');
    }
  }

  PlatformWebViewControllerCreationParams _createPlatformParams() {
    if (WebViewPlatform.instance is WebKitWebViewPlatform) {
      return WebKitWebViewControllerCreationParams(
        allowsInlineMediaPlayback: true,
        mediaTypesRequiringUserAction: const <PlaybackMediaTypes>{},
      );
    }
    return const PlatformWebViewControllerCreationParams();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.transparent,
      extendBodyBehindAppBar: true,

      // appBar: myAppBar(context: context),
      body: _buildBody(),
    );
  }

  Widget _buildBody() {
    if (_errorMessage != null) {
      return Center(
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Text(
            '页面加载失败\n$_errorMessage',
            textAlign: TextAlign.center,
            style: const TextStyle(color: Colors.white, fontSize: 14),
          ),
        ),
      );
    }

    final controller = _controller;
    if (controller == null) {
      return const Center(child: CircularProgressIndicator());
    }

    return PopScope(
      canPop: widget.canPop ?? true,
      onPopInvokedWithResult: (didPop, result) async {
        if (didPop) return;

        final ok = await showDialog<bool>(
          context: context,
          builder: (context) => AlertDialog(
            title: const Text("提示"),
            content: const Text("是否返回上一页？"),
            actions: [
              TextButton(
                onPressed: () => Navigator.of(context).pop(false),
                child: const Text("取消"),
              ),
              TextButton(
                onPressed: () => Navigator.of(context).pop(true),
                child: const Text("确定"),
              ),
            ],
          ),
        );
        if (ok == true) {
          AppNavigator.pop();
        }
      },
      child: Scaffold(
        body: Column(
          children: [
            SizedBox(height: 48),
            Expanded(
              child: Stack(
                children: [
                  Positioned.fill(child: WebViewWidget(controller: controller)),
                  if (_isLoading)
                    const Center(child: CircularProgressIndicator()),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}