import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:loading_animation_widget/loading_animation_widget.dart';
import 'package:skywood/global/const/common_color.dart';
import 'package:skywood/utils/tools/widgets/sky_app_bar.dart';
import 'package:webview_flutter/webview_flutter.dart';

import '../../../utils/tools/help_img.dart';

/// WebView 页面参数
class WebLinkParams {
  final String title;
  final String urlString;
  final bool showAppbar;

  const WebLinkParams({
    this.title = 'Web View',
    required this.urlString,
    this.showAppbar = true,
  });
}

/// WebView 页面
class SkyWebPage extends StatefulWidget {
  final WebLinkParams params;

  const SkyWebPage({
    super.key,
    required this.params,
  });

  @override
  State<SkyWebPage> createState() => _WebLinkViewState();
}

class _WebLinkViewState extends State<SkyWebPage> {
  late WebViewController _webViewController;
  int _loadingProgress = 0;
  bool _isLoading = true;
  bool _hasError = false;
  String _errorMessage = '';
  String _urlString = '';

  @override
  void initState() {
    super.initState();
    _initializeParameters();
    _initializeWebView();
    _loadUrl();
  }

  void _initializeParameters() {
    _urlString = _validateAndFixUrl(widget.params.urlString);
  }

  void _initializeWebView() {
    _webViewController = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setBackgroundColor(const Color(0x00FF0000))
      ..setNavigationDelegate(
        NavigationDelegate(
          onProgress: (int progress) {
            setState(() {
              _loadingProgress = progress;
            });
          },
          onPageStarted: (String url) {
            setState(() {
              _isLoading = true;
              _hasError = false;
              _loadingProgress = 0;
            });
          },
          onPageFinished: (String url) async {
            setState(() {
              _isLoading = false;
              _loadingProgress = 100;
            });

            // 修改网页背景为透明，文字为白色
            await _webViewController.runJavaScript('''
              document.body.style.background = 'none';
              document.body.style.color = '#fff';

              // 修改标题样式
              var titleElements = document.getElementsByClassName('title');
              for (var i = 0; i < titleElements.length; i++) {
                titleElements[i].style.display = 'none';
              }
              
              // 修改文本背景为白色
              var bgElements = document.getElementsByClassName('bg-fff');
              for (var i = 0; i < bgElements.length; i++) {
                bgElements[i].style.background = 'none';
                bgElements[i].style.paddingTop = '0px';
              }

              // 修改所有文本元素为白色
              var allElements = document.getElementsByTagName('*');
              for (var i = 0; i < allElements.length; i++) {
                allElements[i].style.color = '#fff';
              }
              
              // 修改链接颜色
              var links = document.getElementsByTagName('a');
              for (var i = 0; i < links.length; i++) {
                links[i].style.color = '#87CEEB';
              }
            ''');
          },
          onHttpError: (HttpResponseError error) {
            setState(() {
              _hasError = true;
              _errorMessage = 'HTTP Error: ${error.response?.statusCode ?? "Unknown"}';
              _isLoading = false;
            });
          },
          onWebResourceError: (WebResourceError error) {
            setState(() {
              _hasError = true;
              _errorMessage = error.description;
              _isLoading = false;
            });
          },
          onNavigationRequest: (NavigationRequest request) {
            return NavigationDecision.navigate;
          },
        ),
      );
  }

  void _loadUrl() {
    if (_urlString.isEmpty) {
      setState(() {
        _hasError = true;
        _errorMessage = 'Invalid URL';
        _isLoading = false;
      });
      return;
    }

    try {
      final uri = Uri.parse(_urlString);
      _webViewController.loadRequest(uri);
    } catch (e) {
      setState(() {
        _hasError = true;
        _errorMessage = 'Failed to load URL: $e';
        _isLoading = false;
      });
    }
  }

  String _validateAndFixUrl(String url) {
    if (url.isEmpty) {
      return '';
    }

    url = url.trim();

    // Already has a valid scheme
    if (url.startsWith('http://') || url.startsWith('https://')) {
      return url;
    }

    // Looks like a domain (has a dot and no spaces)
    if (url.contains('.') && !url.contains(' ')) {
      return 'https://$url';
    }

    // Treat as search query
    return 'https://www.google.com/search?q=${Uri.encodeComponent(url)}';
  }

  void _reload() {
    setState(() {
      _hasError = false;
      _isLoading = true;
      _loadingProgress = 0;
      _errorMessage = '';
    });
    _initializeWebView();
    _loadUrl();
  }

  void _goBack() {
    _webViewController.goBack();
  }

  void _goForward() {
    _webViewController.goForward();
  }

  @override
  void dispose() {
    _webViewController.clearCache();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBodyBehindAppBar: true,
      appBar: widget.params.showAppbar
          ? _buildAppBar()
          : null,
      body: _buildBody(),
    );
  }

  PreferredSizeWidget _buildAppBar() {
    return SkyAppBar(
      backgroundColor: Colors.transparent,
      title:  widget.params.title,
      titleColor: Colors.white,
      actions: [
        IconButton(
          icon: const Icon(Icons.refresh, color: Colors.white,),
          onPressed: _reload,
        ),
      ],
    );
  }

  Widget _buildBody() {
    return Container(
      decoration: BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topCenter,
          end: Alignment.bottomCenter,
          colors: [
            CommonColor.primacyColor,
            Color(0xFF2D1B4E),
          ],
        ),
      ),
      child: SafeArea(
        child: Column(
          children: [
            // 加载进度条（可选）
            if (_isLoading)
              LinearProgressIndicator(
                value: _loadingProgress / 100,
                backgroundColor: Colors.white.withOpacity(0.2),
                valueColor: const AlwaysStoppedAnimation<Color>(
                  Color(0xFFFB98E0),
                ),
              ),
            Expanded(
              child: _buildContent(),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildContent() {
    if (_isLoading) {
      return Center(
        child: SizedBox(
          width: 120,
          height: 120,
          child: Image.asset(ConstImg.loading, fit: BoxFit.fill),
        ),
      );
    }

    if (_hasError) {
      return _buildErrorWidget();
    }

    return WebViewWidget(
      controller: _webViewController,
    );
  }

  Widget _buildErrorWidget() {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(
            Icons.error_outline,
            size: 64.w,
            color: Colors.white.withOpacity(0.6),
          ),
          SizedBox(height: 16.h),
          Text(
            _errorMessage,
            style: TextStyle(
              color: Colors.white.withOpacity(0.8),
              fontSize: 16.sp,
            ),
            textAlign: TextAlign.center,
          ),
          SizedBox(height: 24.h),
          ElevatedButton(
            onPressed: _reload,
            style: ElevatedButton.styleFrom(
              backgroundColor: const Color(0xFFFB98E0),
              foregroundColor: Colors.white,
            ),
            child: const Text('重试'),
          ),
        ],
      ),
    );
  }
}