feat: add data models and api service

lib/services/api_service.dart

@@ -0,0 +1,107 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import '../models/models.dart';
+
+class ApiService {
+  String baseUrl;
+  String? _token;
+
+  ApiService({required this.baseUrl});
+
+  String? get token => _token;
+  bool get isAuthenticated => _token != null;
+
+  void setToken(String token) {
+    _token = token;
+  }
+
+  Map<String, String> get _headers => {
+    if (_token != null) 'Authorization': 'Bearer $_token',
+    'Content-Type': 'application/json',
+    'Accept': 'application/json',
+  };
+
+  Future<AuthResponse> login(String email, String password) async {
+    final response = await http.post(
+      Uri.parse('$baseUrl/api/v1/auth'),
+      headers: {'Content-Type': 'application/json'},
+      body: jsonEncode({'email': email, 'password': password}),
+    );
+
+    if (response.statusCode == 200) {
+      final data = AuthResponse.fromJson(jsonDecode(response.body));
+      setToken(data.token);
+      return data;
+    }
+
+    final body = jsonDecode(response.body);
+    throw ApiException(
+      statusCode: response.statusCode,
+      message: body['error'] ?? 'Unknown error',
+    );
+  }
+
+  Future<AppsResponse> getApps() async {
+    final response = await http.get(
+      Uri.parse('$baseUrl/api/v1/apps'),
+      headers: _headers,
+    );
+
+    if (response.statusCode == 200) {
+      return AppsResponse.fromJson(jsonDecode(response.body));
+    }
+
+    if (response.statusCode == 401) {
+      throw AuthException();
+    }
+
+    final body = jsonDecode(response.body);
+    throw ApiException(
+      statusCode: response.statusCode,
+      message: body['error'] ?? 'Unknown error',
+    );
+  }
+
+  Future<http.StreamedResponse> downloadVersion(String versionId) async {
+    final request = http.Request(
+      'GET',
+      Uri.parse('$baseUrl/api/v1/versions/$versionId/download'),
+    );
+    request.headers.addAll(_headers);
+
+    final response = await http.Client().send(request);
+
+    if (response.statusCode == 200) {
+      return response;
+    }
+
+    if (response.statusCode == 401) {
+      throw AuthException();
+    }
+
+    response.stream.drain();
+    final body = await response.stream.bytesToString();
+    final parsed = jsonDecode(body);
+    throw ApiException(
+      statusCode: response.statusCode,
+      message: parsed['error'] ?? 'Download failed',
+    );
+  }
+
+  String iconUrl(String iconPath) {
+    if (iconPath.startsWith('http')) return iconPath;
+    return '$baseUrl$iconPath';
+  }
+}
+
+class ApiException implements Exception {
+  final int statusCode;
+  final String message;
+
+  ApiException({required this.statusCode, required this.message});
+
+  @override
+  String toString() => message;
+}
+
+class AuthException implements Exception {}