import 'dart:convert';

import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';

import '../config.dart';
import '../models.dart';
import 'auth_service.dart';

/// Client de l'API GameManager (Bearer JWT pocket-id).
class ApiService {
  ApiService(this._auth);
  final AuthService _auth;

  Future<String> get baseUrl async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getString('api_base') ?? Config.defaultApiBase;
  }

  Future<void> setBaseUrl(String url) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('api_base', url.trim().replaceAll(RegExp(r'/$'), ''));
  }

  Future<Map<String, String>> _headers() async {
    final token = await _auth.validToken();
    return {'Authorization': 'Bearer ${token ?? ''}', 'Accept': 'application/json'};
  }

  Future<List<GameServer>> servers() async {
    final base = await baseUrl;
    final res = await http.get(Uri.parse('$base/api/servers'), headers: await _headers());
    if (res.statusCode == 401) throw UnauthorizedException();
    if (res.statusCode != 200) throw ApiException('Erreur ${res.statusCode}');
    final list = jsonDecode(res.body) as List;
    return list.map((e) => GameServer.fromJson(e as Map<String, dynamic>)).toList();
  }

  Future<void> start(String id) => _action(id, 'start');
  Future<void> stop(String id) => _action(id, 'stop');

  Future<void> _action(String id, String action) async {
    final base = await baseUrl;
    final res = await http.post(
      Uri.parse('$base/api/servers/$id/$action'),
      headers: await _headers(),
    );
    if (res.statusCode == 401) throw UnauthorizedException();
    if (res.statusCode >= 400) throw ApiException('Action refusée (${res.statusCode})');
  }

  Future<String> iconUrl(String id) async => '${await baseUrl}/api/servers/$id/icon';
}

class UnauthorizedException implements Exception {}

class ApiException implements Exception {
  ApiException(this.message);
  final String message;
  @override
  String toString() => message;
}