// lib/pages/webdav_file_list_page.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../services/webdav_service.dart';
import '../services/playback_service.dart';
import '../services/audio_service.dart';
import '../constants/ui_constants.dart';
import '../base/base_state.dart';
import '../controllers/playback_controller.dart';

class WebDAVFileListPage extends StatefulWidget {
  final String currentPath;

  const WebDAVFileListPage({super.key, this.currentPath = '/'});

  @override
  State<WebDAVFileListPage> createState() => _WebDAVFileListPageState();
}

class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
  List<WebDAVItem> _items = [];
  bool _isLoading = true;
  String _errorMessage = '';
  String _currentPath = '/';

  // 安全解码
  String _safeDecode(String input) {
    try {
      return Uri.decodeComponent(input);
    } catch (_) {
      return input;
    }
  }

  @override
  void initState() {
    super.initState();
    _currentPath = widget.currentPath;
    _loadDirectory();
  }

  // ============================================================
  // 加载目录
  // ============================================================
  Future<void> _loadDirectory() async {
    safeSetState(() {
      _isLoading = true;
      _errorMessage = '';
    });

    try {
      final items =
          await WebDAVService.instance.listDirectory(path: _currentPath);
      if (mounted) {
        safeSetState(() {
          _items = items;
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) {
        safeSetState(() {
          _errorMessage = '加载失败: $e';
          _isLoading = false;
        });
      }
    }
  }

  // ============================================================
  // 进入子目录
  // ============================================================
  void _enterDirectory(WebDAVItem dir) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (_) => WebDAVFileListPage(currentPath: dir.path),
      ),
    );
  }

// ============================================================
// 播放单首（点击歌曲）
// ============================================================
  void _playSong(WebDAVItem file) async {
    try {
      // ⭐ 直接使用 PlaybackController 单例
      await PlaybackController().playFromWebDAV(
        directoryPath: _currentPath,
        clickedSongPath: file.path,
        allItems: _items,
      );

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('正在播放: ${_safeDecode(file.name)}'),
            backgroundColor: const Color(0xFF4CAF50),
            duration: const Duration(seconds: 1),
          ),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('播放失败: $e'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }
  }

// ============================================================
// 全部播放
// ============================================================
  void _playAll() async {
    try {
      // ⭐ 全部播放使用 playAllFromWebDAV
      await PlaybackController().playAllFromWebDAV(
        directoryPath: _currentPath,
        allItems: _items,
      );

      if (mounted) {
        final musicCount = _items.where((item) => !item.isDirectory).length;
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('开始播放全部 ($musicCount 首)'),
            backgroundColor: const Color(0xFF4CAF50),
            duration: const Duration(seconds: 1),
          ),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('播放失败: $e'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }
  }

  // ============================================================
  // 显示路径
  // ============================================================
  String _getDisplayPath() {
    if (_currentPath == '/' || _currentPath.isEmpty) return '根目录';

    final decoded = _safeDecode(_currentPath);
    final parts = decoded.split('/').where((s) => s.isNotEmpty).toList();

    if (parts.isEmpty) return '根目录';
    if (parts.length <= 2) return parts.join(' / ');
    return '... / ${parts.sublist(parts.length - 2).join(' / ')}';
  }

  // ============================================================
  // Build
  // ============================================================
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFF0E1211),
      appBar: AppBar(
        title: Text(
          _getDisplayPath(),
          style: const TextStyle(fontSize: 16),
        ),
        backgroundColor: Colors.transparent,
        elevation: 0,
        foregroundColor: Colors.white,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back_ios_new),
          onPressed: () => Navigator.pop(context),
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.playlist_play),
            onPressed: _playAll,
            tooltip: '全部播放',
          ),
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _loadDirectory,
            tooltip: '刷新',
          ),
        ],
      ),
      body: _isLoading
          ? const Center(
              child: CircularProgressIndicator(
                color: Color(0xFFB8D4D0),
              ),
            )
          : _errorMessage.isNotEmpty
              ? Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Icon(Icons.error_outline,
                          size: 48, color: Colors.grey[600]),
                      const SizedBox(height: 16),
                      Text(
                        _errorMessage,
                        style: TextStyle(color: Colors.grey[400]),
                        textAlign: TextAlign.center,
                      ),
                      const SizedBox(height: 16),
                      ElevatedButton(
                        onPressed: _loadDirectory,
                        style: ElevatedButton.styleFrom(
                          backgroundColor: const Color(0xFFB8D4D0),
                          foregroundColor: Colors.black87,
                        ),
                        child: const Text('重试'),
                      ),
                    ],
                  ),
                )
              : _items.isEmpty
                  ? Center(
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Icon(Icons.folder_open,
                              size: 48, color: Colors.grey[600]),
                          const SizedBox(height: 16),
                          Text(
                            '此目录为空',
                            style: TextStyle(color: Colors.grey[400]),
                          ),
                          const SizedBox(height: 8),
                          Text(
                            '支持格式: MP3, FLAC, M4A, APE, WAV, OPUS',
                            style: TextStyle(
                                color: Colors.grey[600], fontSize: 12),
                          ),
                        ],
                      ),
                    )
                  : ListView.builder(
                      padding: const EdgeInsets.only(
                        left: 16,
                        right: 16,
                        top: 8,
                        bottom: UIConstants.miniPlayerBottomSpace,
                      ),
                      itemCount: _items.length,
                      itemBuilder: (context, index) {
                        final item = _items[index];
                        return _buildListItem(item);
                      },
                    ),
    );
  }

  // ============================================================
  // 构建列表项
  // ============================================================
  Widget _buildListItem(WebDAVItem item) {
    final displayName = _safeDecode(item.name);

    if (item.isDirectory) {
      return ListTile(
        contentPadding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
        leading: const Icon(
          Icons.folder_outlined,
          color: Color(0xFFB8D4D0),
          size: 32,
        ),
        title: Text(
          displayName,
          style: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w500,
            color: Colors.white,
          ),
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
        ),
        subtitle: Text(
          '文件夹',
          style: TextStyle(
            fontSize: 12,
            color: Colors.grey[500],
          ),
        ),
        trailing: const Icon(
          Icons.chevron_right,
          color: Colors.grey,
        ),
        onTap: () => _enterDirectory(item),
      );
    } else {
      final sizeStr = item.size != null
          ? '${(item.size! / 1024 / 1024).toStringAsFixed(1)} MB'
          : '';
      return ListTile(
        contentPadding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
        leading: const Icon(
          Icons.audiotrack,
          color: Color(0xFFB8D4D0),
          size: 28,
        ),
        title: Text(
          displayName,
          style: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w400,
            color: Colors.white,
          ),
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
        ),
        subtitle: Text(
          sizeStr,
          style: TextStyle(
            fontSize: 12,
            color: Colors.grey[500],
          ),
        ),
        trailing: IconButton(
          icon: const Icon(Icons.play_arrow, color: Color(0xFFB8D4D0)),
          onPressed: () => _playSong(item),
        ),
        onTap: () => _playSong(item),
      );
    }
  }
}