import 'dart:convert';
import 'dart:io';
import 'package:http_parser/http_parser.dart';
import 'package:http/http.dart' as http;
import 'package:mime/mime.dart';
import '../models/guild.dart';
import '../models/channel.dart';
import '../models/message.dart';
import '../models/user.dart';
import '../models/role.dart';

class ApiService {
  String _baseUrl = 'http://localhost:8443';
  String? _token;

  ApiService({String? baseUrl}) {
    if (baseUrl != null) _baseUrl = baseUrl;
  }

  void setBaseUrl(String url) {
    _baseUrl = url;
  }

  void updateFromWsUrl(String wsUrl) {
    _baseUrl = wsUrl.replaceFirst('ws://', 'http://').replaceFirst('wss://', 'https://');
    if (_baseUrl.endsWith('/ws')) {
      _baseUrl = _baseUrl.substring(0, _baseUrl.length - 3);
    }
  }

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

  Future<bool> healthCheck() async {
    try {
      final resp = await http.get(
        Uri.parse('$_baseUrl/api/health'),
      ).timeout(const Duration(seconds: 5));
      return resp.statusCode == 200;
    } catch (_) {
      return false;
    }
  }

  Future<List<Guild>> getGuilds(String userId) async {
    final resp = await http.get(
      Uri.parse('$_baseUrl/api/guilds?user_id=$userId'),
      headers: _headers,
    );
    if (resp.statusCode != 200) throw Exception('Failed to load guilds');
    final List<dynamic> data = jsonDecode(resp.body);
    return data.map((g) => Guild.fromJson(g)).toList();
  }

  Future<String> createGuild(String name, String ownerId, {String? description}) async {
    final resp = await http.post(
      Uri.parse('$_baseUrl/api/guilds'),
      headers: _headers,
      body: jsonEncode({
        'name': name,
        'owner_id': ownerId,
        'description': description ?? '',
      }),
    );
    if (resp.statusCode != 201) throw Exception('Failed to create guild');
    final data = jsonDecode(resp.body);
    return data['id'] as String;
  }

  Future<Map<String, dynamic>> getGuild(String guildId) async {
    final resp = await http.get(
      Uri.parse('$_baseUrl/api/guilds/$guildId'),
      headers: _headers,
    );
    if (resp.statusCode != 200) throw Exception('Failed to load guild');
    return jsonDecode(resp.body);
  }

  Future<Channel> createChannel({
    required String guildId,
    required String name,
    String type = 'text',
    String? categoryId,
    String? topic,
  }) async {
    final resp = await http.post(
      Uri.parse('$_baseUrl/api/channels'),
      headers: _headers,
      body: jsonEncode({
        'guild_id': guildId,
        'category_id': categoryId ?? '',
        'name': name,
        'type': type,
        'topic': topic ?? '',
        'position': 0,
      }),
    );
    if (resp.statusCode != 201) throw Exception('Failed to create channel');
    return Channel.fromJson(jsonDecode(resp.body));
  }

  Future<List<Message>> getMessages(String channelId, {int limit = 50, String? before}) async {
    final params = 'channel_id=$channelId&limit=$limit${before != null ? '&before=$before' : ''}';
    final resp = await http.get(
      Uri.parse('$_baseUrl/api/messages?$params'),
      headers: _headers,
    );
    if (resp.statusCode != 200) throw Exception('Failed to load messages');
    final List<dynamic> data = jsonDecode(resp.body);
    return data.map((m) => Message.fromJson(m)).toList();
  }

  Future<String> uploadFile(File file) async {
    final uri = Uri.parse('$_baseUrl/api/upload');
    final request = http.MultipartRequest('POST', uri);
    final mimeType = lookupMimeType(file.path) ?? 'application/octet-stream';
    final parts = mimeType.split('/');

    request.files.add(await http.MultipartFile.fromPath(
      'file',
      file.path,
      contentType: MediaType(parts[0], parts[1]),
    ));
    if (_token != null) request.headers['Authorization'] = 'Bearer $_token';

    final resp = await request.send();
    if (resp.statusCode != 200) throw Exception('Upload failed');
    final data = jsonDecode(await resp.stream.bytesToString());
    return data['url'] as String;
  }

  Future<User> getUser(String userId) async {
    final resp = await http.get(
      Uri.parse('$_baseUrl/api/users/$userId'),
      headers: _headers,
    );
    if (resp.statusCode != 200) throw Exception('Failed to load user');
    return User.fromJson(jsonDecode(resp.body));
  }

  Future<Role> createRole({
    required String guildId,
    required String name,
    int color = 0,
    List<String>? permissions,
  }) async {
    final resp = await http.post(
      Uri.parse('$_baseUrl/api/roles/'),
      headers: _headers,
      body: jsonEncode({
        'guild_id': guildId,
        'name': name,
        'color': color,
        'position': 0,
        'permissions': permissions ?? [],
      }),
    );
    if (resp.statusCode != 201) throw Exception('Failed to create role');
    return Role.fromJson(jsonDecode(resp.body));
  }
}