import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:file_picker/file_picker.dart';
import 'package:pad_scanner/services/api_service.dart';
import 'package:pad_scanner/services/sound_service.dart';

class SettingsPage extends StatefulWidget {
  const SettingsPage({super.key});

  @override
  State<SettingsPage> createState() => _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {
  final _controller = TextEditingController();
  final _apiService = ApiService();
  final _soundService = SoundService();
  bool _saving = false;
  bool _testing = false;

  String? _successPath;
  String? _failurePath;

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

  Future<void> _loadUrl() async {
    final prefs = await SharedPreferences.getInstance();
    final url = prefs.getString('api_url') ?? '';
    _controller.text = url;
  }

  Future<void> _loadSoundPaths() async {
    final s = await _soundService.getSuccessPath();
    final f = await _soundService.getFailurePath();
    if (mounted) {
      setState(() {
        _successPath = s;
        _failurePath = f;
      });
    }
  }

  Future<void> _saveUrl() async {
    final url = _controller.text.trim();
    if (url.isEmpty) {
      _showSnackBar('请输入 API 地址', isError: true);
      return;
    }
    setState(() => _saving = true);
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('api_url', url);
    setState(() => _saving = false);
    if (mounted) {
      _showSnackBar('设置已保存');
    }
  }

  Future<void> _testConnection() async {
    final url = _controller.text.trim();
    if (url.isEmpty) {
      _showSnackBar('请先输入 API 地址', isError: true);
      return;
    }
    setState(() => _testing = true);
    final ok = await _apiService.testConnection(url);
    setState(() => _testing = false);
    if (mounted) {
      _showSnackBar(
        ok ? '连接成功' : '连接失败，请检查地址和网络',
        isError: !ok,
      );
    }
  }

  Future<void> _pickSound(bool isSuccess) async {
    final result = await FilePicker.pickFiles(
      type: FileType.audio,
    );
    if (result != null && result.files.single.path != null) {
      final path = result.files.single.path!;
      if (isSuccess) {
        await _soundService.setSuccessPath(path);
      } else {
        await _soundService.setFailurePath(path);
      }
      setState(() {
        if (isSuccess) {
          _successPath = path;
        } else {
          _failurePath = path;
        }
      });
    }
  }

  Future<void> _clearSound(bool isSuccess) async {
    if (isSuccess) {
      await _soundService.setSuccessPath(null);
    } else {
      await _soundService.setFailurePath(null);
    }
    setState(() {
      if (isSuccess) {
        _successPath = null;
      } else {
        _failurePath = null;
      }
    });
  }

  Future<void> _previewSound(String path) async {
    await _soundService.play(path);
  }

  String _fileName(String? path) {
    if (path == null) return '未设置';
    return path.split('/').last;
  }

  void _showSnackBar(String message, {bool isError = false}) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        backgroundColor:
            isError ? Colors.red.shade700 : Colors.green.shade700,
        duration: const Duration(seconds: 2),
      ),
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('设置')),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // ---- API 地址 ----
            const Text('API 服务器地址', style: TextStyle(fontSize: 14)),
            const SizedBox(height: 8),
            TextField(
              controller: _controller,
              decoration: const InputDecoration(
                hintText: 'http://192.168.1.100:8000',
                border: OutlineInputBorder(),
              ),
              keyboardType: TextInputType.url,
            ),
            const SizedBox(height: 20),
            ElevatedButton.icon(
              onPressed: _saving ? null : _saveUrl,
              icon: _saving
                  ? const SizedBox(
                      width: 18,
                      height: 18,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.save),
              label: const Text('保存设置'),
            ),
            const SizedBox(height: 8),
            OutlinedButton.icon(
              onPressed: _testing ? null : _testConnection,
              icon: _testing
                  ? const SizedBox(
                      width: 18,
                      height: 18,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.wifi),
              label: const Text('测试连接'),
            ),

            const SizedBox(height: 24),

            // ---- 铃声设置 ----
            const Divider(),
            const SizedBox(height: 8),
            const Text('铃声设置',
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
            const SizedBox(height: 16),

            // 上架成功铃声
            _buildSoundRow(
              label: '上架成功铃声',
              path: _successPath,
              onPick: () => _pickSound(true),
              onPreview: _successPath != null
                  ? () => _previewSound(_successPath!)
                  : null,
              onClear: _successPath != null ? () => _clearSound(true) : null,
            ),

            const SizedBox(height: 12),

            // 上架失败铃声
            _buildSoundRow(
              label: '上架失败铃声',
              path: _failurePath,
              onPick: () => _pickSound(false),
              onPreview: _failurePath != null
                  ? () => _previewSound(_failurePath!)
                  : null,
              onClear:
                  _failurePath != null ? () => _clearSound(false) : null,
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildSoundRow({
    required String label,
    required String? path,
    required VoidCallback onPick,
    required VoidCallback? onPreview,
    required VoidCallback? onClear,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(label, style: const TextStyle(fontSize: 14)),
        const SizedBox(height: 6),
        Row(
          children: [
            Expanded(
              child: Container(
                padding:
                    const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.grey.shade400),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Text(
                  _fileName(path),
                  style: TextStyle(
                    fontSize: 13,
                    color: path != null ? Colors.black87 : Colors.grey,
                  ),
                  overflow: TextOverflow.ellipsis,
                ),
              ),
            ),
            const SizedBox(width: 8),
            IconButton(
              icon: const Icon(Icons.folder_open),
              tooltip: '选择文件',
              onPressed: onPick,
            ),
            if (onPreview != null)
              IconButton(
                icon: const Icon(Icons.play_arrow),
                tooltip: '试听',
                onPressed: onPreview,
              ),
            if (onClear != null)
              IconButton(
                icon: const Icon(Icons.clear, size: 20),
                tooltip: '清除',
                onPressed: onClear,
              ),
          ],
        ),
      ],
    );
  }
}