import 'package:flutter/foundation.dart';
import 'package:flutter/material.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;

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

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

class WebviewPageState extends State<WebviewPage> {
  WebViewController? _controller;
  bool _isLoading = true;
  String? _errorMessage;

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

  Future<void> _initController() async {
    if (widget.url?.isEmpty ?? true) {
      return;
    }
    final params = _createPlatformParams();
    final 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) {
            debugPrint('webview - page finished: $url');
            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;
          },
        ),
      );

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

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

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

  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: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        title: Text(
          widget.title ?? '',
          style: const TextStyle(color: Colors.white),
        ),
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.white),
          onPressed: () async {
            final controller = _controller;
            if (controller != null && await controller.canGoBack()) {
              await controller.goBack();
            } else {
              if (context.mounted) Navigator.of(context).maybePop();
            }
          },
        ),
        iconTheme: const IconThemeData(color: Colors.white),
      ),

      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 Stack(
      children: [
        Positioned.fill(child: WebViewWidget(controller: controller)),
        if (_isLoading) const Center(child: CircularProgressIndicator()),
      ],
    );
  }
}