import 'package:flutter/foundation.dart';

import '../models/character_pack.dart';
import '../services/http_api_service.dart';
import 'debug_provider.dart';

class CharacterProvider extends ChangeNotifier {
  CharacterProvider({
    required HttpApiService httpApiService,
    required DebugProvider debugProvider,
  })  : _http = httpApiService,
        _debug = debugProvider;

  final HttpApiService _http;
  final DebugProvider _debug;

  List<CharacterPack> _packs = const [];
  String _active = '';
  bool _loading = false;
  bool _switching = false;
  String? _error;

  List<CharacterPack> get packs => _packs;
  String get activeFilename => _active;
  bool get isLoading => _loading;
  bool get isSwitching => _switching;
  String? get error => _error;

  CharacterPack? get activePack {
    for (final pack in _packs) {
      if (pack.filename == _active) return pack;
    }
    return null;
  }

  Future<void> refresh() async {
    _loading = true;
    _error = null;
    notifyListeners();
    try {
      final snapshot = await _http.getAvailableCharacterConfigs();
      _packs = snapshot.configs;
      _active = snapshot.active;
      _debug.addHttpLog(
        'Loaded characters',
        details: 'count=${_packs.length} active=$_active',
      );
    } catch (error) {
      _error = error.toString();
      _debug.addHttpLog('Load characters failed', details: _error);
    } finally {
      _loading = false;
      notifyListeners();
    }
  }

  Future<bool> switchTo(String filename) async {
    if (_switching || filename == _active) return false;
    _switching = true;
    _error = null;
    notifyListeners();
    try {
      final result = await _http.switchConfig(filename);
      if (!result.isOk) {
        _error = result.message;
        _debug.addHttpLog('Switch character failed', details: result.message);
        return false;
      }
      _active = filename;
      _debug.addHttpLog('Switched character', details: filename);
      // 热重载后刷新列表，确保 active 与服务端一致
      await refresh();
      return true;
    } catch (error) {
      _error = error.toString();
      _debug.addHttpLog('Switch character failed', details: _error);
      return false;
    } finally {
      _switching = false;
      notifyListeners();
    }
  }
}