import 'dart:convert';
import 'package:http/http.dart' as http;
import '../config/api_config.dart';
import '../models/conversation.dart';
import '../models/message.dart';

class ApiService {
  String? _token;

  void setToken(String? token) {
    _token = token;
  }

  Map<String, String> get _headers => {
        'Content-Type': 'application/json',
        if (_token != null) 'Authorization': 'Bearer $_token',
      };

  Future<List<Conversation>> getConversations() async {
    final response = await http.get(
      Uri.parse('${ApiConfig.baseUrl}/conversations'),
      headers: _headers,
    ).timeout(ApiConfig.connectionTimeout);

    if (response.statusCode == 200) {
      final List<dynamic> data = jsonDecode(response.body);
      return data.map((e) => Conversation.fromJson(e)).toList();
    }
    throw Exception('Failed to load conversations');
  }

  Future<List<Message>> getConversationMessages(String conversationId) async {
    final response = await http.get(
      Uri.parse('${ApiConfig.baseUrl}/conversations/$conversationId'),
      headers: _headers,
    ).timeout(ApiConfig.connectionTimeout);

    if (response.statusCode == 200) {
      final List<dynamic> data = jsonDecode(response.body);
      return data.map((e) => Message.fromJson(e)).toList();
    }
    throw Exception('Failed to load messages');
  }

  Future<void> deleteConversation(String conversationId) async {
    final response = await http.delete(
      Uri.parse('${ApiConfig.baseUrl}/conversations/$conversationId'),
      headers: _headers,
    ).timeout(ApiConfig.connectionTimeout);

    if (response.statusCode != 200) {
      throw Exception('Failed to delete conversation');
    }
  }
}