// lib/pages/webdav_search_page.dart
import 'package:flutter/material.dart';

import '../controllers/playback_controller.dart';
import '../database/song_database.dart';
import '../services/webdav_service.dart';
import '../widgets/song_artwork.dart';

/// 在当前 WebDAV 文件夹内搜索歌曲
class WebDAVSearchPage extends StatefulWidget {
  final String directoryPath;
  final List<WebDAVItem> items;

  const WebDAVSearchPage({
    super.key,
    required this.directoryPath,
    required this.items,
  });

  @override
  State<WebDAVSearchPage> createState() => _WebDAVSearchPageState();
}

class _WebDAVSearchPageState extends State<WebDAVSearchPage> {
  final TextEditingController _controller = TextEditingController();
  final FocusNode _focusNode = FocusNode();

  /// path -> songs 表行
  Map<String, Map<String, dynamic>> _meta = {};
  String _query = '';

  List<WebDAVItem> get _files =>
      widget.items.where((item) => !item.isDirectory).toList();

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

  @override
  void dispose() {
    _controller.dispose();
    _focusNode.dispose();
    super.dispose();
  }

  Future<void> _loadMeta() async {
    try {
      final paths = _files.map((item) => item.path).toList();
      final meta = await SongDatabase().getSongsByPaths(paths);
      if (!mounted) return;
      setState(() => _meta = meta);
    } catch (e) {
      debugPrint('⚠️ [Search] 读取元数据失败: $e');
    }
  }

  String _decode(String input) {
    try {
      return Uri.decodeComponent(input);
    } catch (_) {
      return input;
    }
  }

  List<WebDAVItem> get _results {
    final keyword = _query.trim().toLowerCase();
    if (keyword.isEmpty) return const [];
    return _files.where((item) {
      final name = _decode(item.name).toLowerCase();
      final meta = _meta[item.path];
      final title = (meta?['title'] as String? ?? '').toLowerCase();
      final artist = (meta?['artist'] as String? ?? '').toLowerCase();
      return name.contains(keyword) ||
          title.contains(keyword) ||
          artist.contains(keyword);
    }).toList();
  }

  Future<void> _play(WebDAVItem item) async {
    try {
      await PlaybackController().playFromWebDAV(
        directoryPath: widget.directoryPath,
        clickedSongPath: item.path,
        allItems: widget.items,
      );
      if (mounted) Navigator.pop(context);
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('播放失败: $e')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final results = _results;

    return Scaffold(
      backgroundColor: const Color(0xFF0E1211),
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        foregroundColor: Colors.white,
        titleSpacing: 0,
        title: TextField(
          controller: _controller,
          focusNode: _focusNode,
          autofocus: true,
          style: const TextStyle(color: Colors.white, fontSize: 16),
          cursorColor: const Color(0xFFB8D4D0),
          decoration: const InputDecoration(
            hintText: '搜索本文件夹的歌曲',
            hintStyle: TextStyle(color: Colors.white38, fontSize: 15),
            border: InputBorder.none,
          ),
          onChanged: (value) => setState(() => _query = value),
        ),
        actions: [
          if (_query.isNotEmpty)
            IconButton(
              icon: const Icon(Icons.close, color: Colors.white54),
              tooltip: '清除',
              onPressed: () {
                _controller.clear();
                setState(() => _query = '');
              },
            ),
        ],
      ),
      body: _query.trim().isEmpty
          ? _buildHint()
          : results.isEmpty
              ? _buildEmpty()
              : ListView.builder(
                  padding: const EdgeInsets.symmetric(
                      horizontal: 16, vertical: 8),
                  itemCount: results.length,
                  itemBuilder: (context, index) {
                    final item = results[index];
                    final meta = _meta[item.path];
                    final metaTitle =
                        (meta?['title'] as String?)?.trim() ?? '';
                    final metaArtist =
                        (meta?['artist'] as String?)?.trim() ?? '';
                    final artwork =
                        (meta?['artwork_path'] as String?)?.trim() ?? '';
                    final name = _decode(item.name);

                    return ListTile(
                      contentPadding:
                          const EdgeInsets.symmetric(horizontal: 4),
                      visualDensity: VisualDensity.compact,
                      leading: SongArtwork(
                        filePath: artwork.isNotEmpty ? artwork : null,
                        size: 44,
                        fallbackIcon: Icons.audiotrack,
                      ),
                      title: Text(
                        metaTitle.isNotEmpty ? metaTitle : name,
                        style: const TextStyle(
                            color: Colors.white, fontSize: 16),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      subtitle: Text(
                        metaArtist.isNotEmpty
                            ? metaArtist
                            : (item.size != null
                                ? '${(item.size! / 1024 / 1024).toStringAsFixed(1)} MB'
                                : ''),
                        style: const TextStyle(
                            color: Colors.grey, fontSize: 12),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      onTap: () => _play(item),
                    );
                  },
                ),
    );
  }

  Widget _buildHint() {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.search, size: 48, color: Colors.grey[700]),
          const SizedBox(height: 14),
          Text(
            '输入歌名、歌手或文件名',
            style: TextStyle(color: Colors.grey[500], fontSize: 14),
          ),
          const SizedBox(height: 6),
          Text(
            '只在当前文件夹内搜索',
            style: TextStyle(color: Colors.grey[700], fontSize: 12),
          ),
        ],
      ),
    );
  }

  Widget _buildEmpty() {
    return Center(
      child: Text(
        '没有找到「${_query.trim()}」',
        style: TextStyle(color: Colors.grey[500], fontSize: 14),
      ),
    );
  }
}