/**
 * 并发用户测试结构验证
 * 
 * 功能描述：
 * - 验证并发用户测试的结构和逻辑正确性
 * - 测试辅助函数和测试用例组织
 * - 确保测试代码本身的质量
 * 
 * @author moyin
 * @version 1.0.0
 * @since 2026-01-08
 */

describe('并发用户测试结构验证', () => {
  describe('测试辅助函数', () => {
    it('应该正确定义TestUser接口', () => {
      interface TestUser {
        id: string;
        client: any;
        sessionId?: string;
        position?: { x: number; y: number; mapId: string };
        connected: boolean;
        joined: boolean;
      }

      const testUser: TestUser = {
        id: 'test-user-1',
        client: null,
        connected: false,
        joined: false,
      };

      expect(testUser.id).toBe('test-user-1');
      expect(testUser.connected).toBe(false);
      expect(testUser.joined).toBe(false);
    });

    it('应该正确处理用户清理逻辑', () => {
      const mockUsers = [
        {
          id: 'user1',
          client: { connected: true, disconnect: jest.fn() },
          connected: true,
          joined: false,
        },
        {
          id: 'user2',
          client: { connected: false, disconnect: jest.fn() },
          connected: false,
          joined: false,
        },
      ];

      // 模拟清理函数
      const cleanupUsers = (users: any[]) => {
        users.forEach(user => {
          if (user.client && user.client.connected) {
            user.client.disconnect();
          }
        });
      };

      cleanupUsers(mockUsers);

      expect(mockUsers[0].client.disconnect).toHaveBeenCalled();
      expect(mockUsers[1].client.disconnect).not.toHaveBeenCalled();
    });
  });

  describe('测试场景覆盖', () => {
    it('应该包含大规模并发连接测试', () => {
      const testScenarios = [
        '应该支持100个用户同时连接',
        '应该支持用户快速连接和断开',
      ];

      expect(testScenarios).toContain('应该支持100个用户同时连接');
      expect(testScenarios).toContain('应该支持用户快速连接和断开');
    });

    it('应该包含并发会话管理测试', () => {
      const testScenarios = [
        '应该支持多用户同时加入同一会话',
        '应该支持用户在多个会话间快速切换',
      ];

      expect(testScenarios).toContain('应该支持多用户同时加入同一会话');
      expect(testScenarios).toContain('应该支持用户在多个会话间快速切换');
    });

    it('应该包含并发位置更新测试', () => {
      const testScenarios = [
        '应该正确处理大量并发位置更新',
        '应该确保位置更新的数据一致性',
      ];

      expect(testScenarios).toContain('应该正确处理大量并发位置更新');
      expect(testScenarios).toContain('应该确保位置更新的数据一致性');
    });

    it('应该包含会话范围广播测试', () => {
      const testScenarios = [
        '应该确保广播只在正确的会话范围内',
      ];

      expect(testScenarios).toContain('应该确保广播只在正确的会话范围内');
    });

    it('应该包含系统资源和稳定性测试', () => {
      const testScenarios = [
        '应该在高并发下保持系统稳定',
        '应该正确处理内存使用和清理',
      ];

      expect(testScenarios).toContain('应该在高并发下保持系统稳定');
      expect(testScenarios).toContain('应该正确处理内存使用和清理');
    });
  });

  describe('性能指标验证', () => {
    it('应该定义合理的性能指标', () => {
      const performanceMetrics = {
        maxConcurrentUsers: 100,
        maxConnectionTimePerUser: 100, // ms
        minSuccessRate: 80, // %
        maxMemoryPerUser: 200 * 1024, // bytes
        maxErrorRate: 5, // %
      };

      expect(performanceMetrics.maxConcurrentUsers).toBeGreaterThan(50);
      expect(performanceMetrics.maxConnectionTimePerUser).toBeLessThan(200);
      expect(performanceMetrics.minSuccessRate).toBeGreaterThan(70);
      expect(performanceMetrics.maxMemoryPerUser).toBeLessThan(500 * 1024);
      expect(performanceMetrics.maxErrorRate).toBeLessThan(10);
    });

    it('应该包含性能监控逻辑', () => {
      const performanceMonitor = {
        startTime: Date.now(),
        endTime: 0,
        totalOperations: 0,
        successfulOperations: 0,
        errors: 0,
        
        calculateMetrics() {
          const duration = this.endTime - this.startTime;
          const successRate = (this.successfulOperations / this.totalOperations) * 100;
          const errorRate = (this.errors / this.totalOperations) * 100;
          
          return {
            duration,
            successRate,
            errorRate,
            operationsPerSecond: this.totalOperations / (duration / 1000),
          };
        }
      };

      performanceMonitor.totalOperations = 100;
      performanceMonitor.successfulOperations = 85;
      performanceMonitor.errors = 5;
      performanceMonitor.endTime = performanceMonitor.startTime + 5000;

      const metrics = performanceMonitor.calculateMetrics();

      expect(metrics.successRate).toBe(85);
      expect(metrics.errorRate).toBe(5);
      expect(metrics.operationsPerSecond).toBe(20);
    });
  });

  describe('测试数据生成', () => {
    it('应该能生成测试用户ID', () => {
      const generateUserId = (prefix: string, index: number) => `${prefix}-${index}`;
      
      const userId = generateUserId('concurrent-user', 42);
      expect(userId).toBe('concurrent-user-42');
    });

    it('应该能生成随机位置数据', () => {
      const generateRandomPosition = (mapId: string = 'plaza') => ({
        x: Math.random() * 1000,
        y: Math.random() * 1000,
        mapId,
      });

      const position = generateRandomPosition();
      
      expect(position.x).toBeGreaterThanOrEqual(0);
      expect(position.x).toBeLessThan(1000);
      expect(position.y).toBeGreaterThanOrEqual(0);
      expect(position.y).toBeLessThan(1000);
      expect(position.mapId).toBe('plaza');
    });

    it('应该能生成会话ID', () => {
      const generateSessionId = (prefix: string, index?: number) => 
        index !== undefined ? `${prefix}-${index}` : `${prefix}-${Date.now()}`;

      const sessionId1 = generateSessionId('test-session', 1);
      const sessionId2 = generateSessionId('test-session');

      expect(sessionId1).toBe('test-session-1');
      expect(sessionId2).toMatch(/^test-session-\d+$/);
    });
  });

  describe('错误处理验证', () => {
    it('应该正确处理连接超时', async () => {
      const createConnectionWithTimeout = (timeout: number = 5000) => {
        return new Promise((resolve, reject) => {
          const timer = setTimeout(() => {
            reject(new Error('连接超时'));
          }, timeout);

          // 模拟连接成功
          setTimeout(() => {
            clearTimeout(timer);
            resolve('连接成功');
          }, timeout / 2);
        });
      };

      const result = await createConnectionWithTimeout(100);
      expect(result).toBe('连接成功');
    });

    it('应该正确处理连接失败', async () => {
      const createFailingConnection = () => {
        return new Promise((resolve, reject) => {
          setTimeout(() => {
            reject(new Error('连接失败'));
          }, 10);
        });
      };

      await expect(createFailingConnection()).rejects.toThrow('连接失败');
    });
  });

  describe('并发控制验证', () => {
    it('应该能正确管理并发Promise', async () => {
      const createConcurrentTasks = (count: number) => {
        return Array.from({ length: count }, (_, i) => 
          new Promise(resolve => setTimeout(() => resolve(i), Math.random() * 100))
        );
      };

      const tasks = createConcurrentTasks(10);
      const results = await Promise.all(tasks);

      expect(results).toHaveLength(10);
      expect(results).toEqual(expect.arrayContaining([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]));
    });

    it('应该能处理部分失败的并发任务', async () => {
      const createMixedTasks = (count: number) => {
        return Array.from({ length: count }, (_, i) => 
          i % 3 === 0 
            ? Promise.reject(new Error(`Task ${i} failed`))
            : Promise.resolve(i)
        );
      };

      const tasks = createMixedTasks(6);
      const results = await Promise.allSettled(tasks);

      const fulfilled = results.filter(r => r.status === 'fulfilled');
      const rejected = results.filter(r => r.status === 'rejected');

      expect(fulfilled).toHaveLength(4); // 1, 2, 4, 5
      expect(rejected).toHaveLength(2);  // 0, 3
    });
  });
});