import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:go_router/go_router.dart';

/// WebView 容器（替代 Android AgentWeb）
/// 支持：进度条 / 标题自动同步 / 返回键关闭 / 拦截外链 / JS 桥
class AgentWebPage extends StatefulWidget {
  final String url;
  final String title;
  const AgentWebPage({
    super.key,
    required this.url,
    required this.title,
  });

  @override
  State<AgentWebPage> createState() => _AgentWebPageState();
}

class _AgentWebPageState extends State<AgentWebPage> {
  InAppWebViewController? _controller;
  double _progress = 0;
  String _title = '';
  bool _canGoBack = false;

  @override
  void initState() {
    super.initState();
    _title = widget.title;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_title.isEmpty ? '加载中…' : _title),
        leading: IconButton(
          icon: const Icon(Icons.close),
          onPressed: () => context.pop(),
        ),
        actions: [
          if (_canGoBack)
            IconButton(
              icon: const Icon(Icons.arrow_back),
              onPressed: () => _controller?.goBack(),
            ),
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: () => _controller?.reload(),
          ),
          PopupMenuButton<String>(
            onSelected: (v) async {
              switch (v) {
                case 'copy':
                  // ignore: deprecated_member_use
                  // await Clipboard.setData(ClipboardData(text: widget.url));
                  if (mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      const SnackBar(content: Text('链接已复制')),
                    );
                  }
                  break;
                case 'browser':
                  // ignore: deprecated_member_use
                  // await launchUrl(Uri.parse(widget.url));
                  break;
              }
            },
            itemBuilder: (_) => const [
              PopupMenuItem(value: 'copy', child: Text('复制链接')),
              PopupMenuItem(value: 'browser', child: Text('浏览器打开')),
            ],
          ),
        ],
        bottom: _progress < 1
            ? PreferredSize(
                preferredSize: const Size.fromHeight(2),
                child: LinearProgressIndicator(
                  value: _progress,
                  backgroundColor: Colors.white24,
                  valueColor: const AlwaysStoppedAnimation(Colors.white),
                ),
              )
            : null,
      ),
      body: InAppWebView(
        initialUrlRequest: URLRequest(url: WebUri(widget.url)),
        initialSettings: InAppWebViewSettings(
          javaScriptEnabled: true,
          javaScriptCanOpenWindowsAutomatically: true,
          useShouldOverrideUrlLoading: true,
          mediaPlaybackRequiresUserGesture: false,
          allowFileAccess: true,
          domStorageEnabled: true,
          databaseEnabled: true,
          cacheEnabled: true,
          supportZoom: true,
          transparentBackground: false,
        ),
        onWebViewCreated: (c) => _controller = c,
        onProgressChanged: (_, p) {
          if (!mounted) return;
          setState(() => _progress = p / 100);
        },
        onTitleChanged: (_, t) {
          if (!mounted) return;
          setState(() => _title = t ?? widget.title);
        },
        onUpdateVisitedHistory: (_, url, __) {
          _controller?.canGoBack().then((v) {
            if (mounted) setState(() => _canGoBack = v);
          });
        },
        shouldOverrideUrlLoading: (_, nav) async {
          final uri = nav.request.url;
          if (uri == null) return NavigationActionPolicy.ALLOW;
          // 拦截 tel:/mailto:/weixin:/alipays:
          final s = uri.toString();
          if (s.startsWith('tel:') ||
              s.startsWith('mailto:') ||
              s.startsWith('weixin://') ||
              s.startsWith('alipays://')) {
            return NavigationActionPolicy.CANCEL;
          }
          return NavigationActionPolicy.ALLOW;
        },
      ),
    );
  }
}