import 'package:flutter_test/flutter_test.dart';
import 'package:dio/dio.dart';
import 'package:mocktail/mocktail.dart';

// Unit tests for API client logic (without actual HTTP calls)
void main() {
  group('API Client Configuration', () {
    test('base URL is configured correctly', () {
      const baseUrl = 'http://localhost:3000';
      expect(baseUrl, isNotEmpty);
      expect(baseUrl, startsWith('http'));
    });

    test('timeout is set', () {
      const connectTimeout = Duration(seconds: 10);
      const receiveTimeout = Duration(seconds: 30);
      
      expect(connectTimeout.inSeconds, 10);
      expect(receiveTimeout.inSeconds, 30);
    });

    test('content type header is JSON', () {
      const contentType = 'application/json';
      expect(contentType, 'application/json');
    });
  });

  group('Auth Token Handling', () {
    test('bearer token format is correct', () {
      const token = 'abc123xyz';
      final header = 'Bearer $token';
      
      expect(header, startsWith('Bearer '));
      expect(header, contains(token));
    });

    test('null token returns no auth header', () {
      const String? token = null;
      final hasAuth = token != null;
      
      expect(hasAuth, isFalse);
    });

    test('empty token returns no auth header', () {
      const token = '';
      final hasAuth = token.isNotEmpty;
      
      expect(hasAuth, isFalse);
    });
  });

  group('Request Formatting', () {
    test('sign in request body is correct', () {
      final body = {
        'email': 'test@example.com',
        'password': 'password123',
      };

      expect(body['email'], 'test@example.com');
      expect(body['password'], 'password123');
    });

    test('sign up request body is correct', () {
      final body = {
        'email': 'test@example.com',
        'password': 'password123',
        'name': 'Test User',
      };

      expect(body['email'], 'test@example.com');
      expect(body['password'], 'password123');
      expect(body['name'], 'Test User');
    });

    test('client create body is correct', () {
      final body = {
        'firstName': 'John',
        'lastName': 'Doe',
        'email': 'john@example.com',
        'phone': '+1234567890',
        'company': 'Acme Corp',
      };

      expect(body['firstName'], 'John');
      expect(body['lastName'], 'Doe');
    });

    test('query parameters are optional', () {
      final params = <String, dynamic>{};
      
      const search = null;
      const tag = null;
      
      if (search != null) params['search'] = search;
      if (tag != null) params['tag'] = tag;
      
      expect(params.isEmpty, isTrue);
    });

    test('query parameters include values when set', () {
      final params = <String, dynamic>{};
      
      const search = 'John';
      const String? tag = null;
      
      if (search != null) params['search'] = search;
      if (tag != null) params['tag'] = tag;
      
      expect(params.length, 1);
      expect(params['search'], 'John');
    });
  });

  group('Response Parsing', () {
    test('client list parses correctly', () {
      final responseData = [
        {'id': '1', 'firstName': 'John', 'lastName': 'Doe'},
        {'id': '2', 'firstName': 'Jane', 'lastName': 'Smith'},
      ];

      final clients = List<Map<String, dynamic>>.from(responseData);
      
      expect(clients.length, 2);
      expect(clients[0]['firstName'], 'John');
      expect(clients[1]['firstName'], 'Jane');
    });

    test('event list parses correctly', () {
      final responseData = [
        {
          'event': {'id': '1', 'type': 'birthday', 'title': "John's Birthday"},
          'client': {'id': 'c1', 'firstName': 'John', 'lastName': 'Doe'},
        },
      ];

      final events = List<Map<String, dynamic>>.from(responseData);
      
      expect(events.length, 1);
      expect(events[0]['event']['type'], 'birthday');
    });

    test('session response contains user', () {
      final sessionData = {
        'user': {
          'id': '1',
          'email': 'test@example.com',
          'name': 'Test User',
        },
        'session': {
          'token': 'abc123',
          'expiresAt': '2026-02-01T00:00:00Z',
        },
      };

      expect(sessionData['user'], isNotNull);
      expect((sessionData['user'] as Map)['email'], 'test@example.com');
    });

    test('sign in response contains token in headers', () {
      // Simulating header extraction
      final headers = {
        'set-auth-token': 'jwt_token_here',
      };

      final token = headers['set-auth-token'];
      expect(token, isNotNull);
      expect(token, 'jwt_token_here');
    });
  });

  group('Error Handling', () {
    test('401 clears stored token', () {
      const statusCode = 401;
      final shouldClearToken = statusCode == 401;
      
      expect(shouldClearToken, isTrue);
    });

    test('non-401 errors preserve token', () {
      const statusCode = 500;
      final shouldClearToken = statusCode == 401;
      
      expect(shouldClearToken, isFalse);
    });

    test('network error is caught', () {
      Exception? caught;
      
      try {
        throw Exception('Network error');
      } catch (e) {
        caught = e as Exception;
      }
      
      expect(caught, isNotNull);
    });
  });

  group('Endpoint URLs', () {
    test('auth endpoints are correct', () {
      const signIn = '/api/auth/sign-in/email';
      const signUp = '/api/auth/sign-up/email';
      const signOut = '/api/auth/sign-out';
      const session = '/api/auth/session';

      expect(signIn, contains('/api/auth/'));
      expect(signUp, contains('/api/auth/'));
      expect(signOut, contains('/api/auth/'));
      expect(session, contains('/api/auth/'));
    });

    test('client endpoints are correct', () {
      const list = '/api/clients';
      const single = '/api/clients/123';
      const contacted = '/api/clients/123/contacted';

      expect(list, '/api/clients');
      expect(single, contains('/api/clients/'));
      expect(contacted, endsWith('/contacted'));
    });

    test('event endpoints are correct', () {
      const list = '/api/events';
      const sync = '/api/events/sync/123';
      const syncAll = '/api/events/sync-all';

      expect(list, '/api/events');
      expect(sync, contains('/sync/'));
      expect(syncAll, '/api/events/sync-all');
    });

    test('email endpoints are correct', () {
      const list = '/api/emails';
      const generate = '/api/emails/generate';
      const send = '/api/emails/123/send';

      expect(list, '/api/emails');
      expect(generate, '/api/emails/generate');
      expect(send, endsWith('/send'));
    });
  });
}