import { DataSource } from 'typeorm';
import { beforeEach, afterEach, afterAll } from 'vitest';
import { UserEntity } from '../modules/users/user.entity';
import { Role } from '../modules/users/role.entity';
import { AppDataSource } from '../data-source';

/**
 * 集成测试数据库工具类 - 使用真实PostgreSQL数据库
 */
export class IntegrationTestDatabase {
  /**
   * 初始化集成测试数据库
   */
  static async initialize(): Promise<DataSource> {
    if (!AppDataSource.isInitialized) {
      await AppDataSource.initialize();
    }
    return AppDataSource;
  }

  /**
   * 清理集成测试数据库
   */
  static async cleanup(): Promise<void> {
    if (AppDataSource.isInitialized) {
      await AppDataSource.destroy();
    }
  }

  /**
   * 获取当前数据源
   */
  static getDataSource(): DataSource | null {
    return AppDataSource.isInitialized ? AppDataSource : null;
  }

  /**
   * 清空所有表数据
   */
  static async clearAllData(): Promise<void> {
    if (!AppDataSource.isInitialized) {
      return;
    }

    const queryRunner = AppDataSource.createQueryRunner();
    await queryRunner.connect();

    try {
      // 获取所有实体
      const entities = AppDataSource.entityMetadatas;

      // 按依赖关系排序（先删除子表，再删除父表）
      const sortedEntities = entities.sort((a, b) => {
        if (a.foreignKeys.some(fk => fk.referencedEntityMetadata.name === b.name)) {
          return 1; // a 依赖于 b，a 应该排在后面
        }
        if (b.foreignKeys.some(fk => fk.referencedEntityMetadata.name === a.name)) {
          return -1; // b 依赖于 a，a 应该排在前面
        }
        return 0;
      });

      // 使用TRUNCATE CASCADE来清空所有表数据（包括有外键约束的表）
      for (const entity of sortedEntities) {
        await queryRunner.query(`TRUNCATE TABLE "${entity.tableName}" CASCADE`);
      }
    } finally {
      await queryRunner.release();
    }
  }
}

/**
 * 测试数据工厂类
 */
export class TestDataFactory {
  /**
   * 创建测试用户数据
   */
  static createUserData(overrides: Partial<UserEntity> = {}): Partial<UserEntity> {
    const timestamp = Date.now();
    return {
      username: `testuser_${timestamp}`,
      password: 'TestPassword123!',
      email: `test_${timestamp}@example.com`,
      phone: `138${timestamp.toString().slice(-8)}`,
      nickname: `Test User ${timestamp}`,
      name: `Test Name ${timestamp}`,
      isDisabled: 0,
      isDeleted: 0,
      ...overrides
    };
  }

  /**
   * 创建测试角色数据
   */
  static createRoleData(overrides: Partial<Role> = {}): Partial<Role> {
    const timestamp = Date.now();
    return {
      name: `test_role_${timestamp}`,
      description: `Test role description ${timestamp}`,
      ...overrides
    };
  }

  /**
   * 在数据库中创建测试用户
   */
  static async createTestUser(dataSource: DataSource, overrides: Partial<UserEntity> = {}): Promise<UserEntity> {
    const userData = this.createUserData(overrides);
    const userRepository = dataSource.getRepository(UserEntity);

    const user = userRepository.create(userData);
    return await userRepository.save(user);
  }

  /**
   * 在数据库中创建测试角色
   */
  static async createTestRole(dataSource: DataSource, overrides: Partial<Role> = {}): Promise<Role> {
    const roleData = this.createRoleData(overrides);
    const roleRepository = dataSource.getRepository(Role);

    const role = roleRepository.create(roleData);
    return await roleRepository.save(role);
  }
}

/**
 * 集成测试数据库生命周期钩子
 */
export function setupIntegrationDatabaseHooks() {
  beforeEach(async () => {
    await IntegrationTestDatabase.initialize();
  });

  afterEach(async () => {
    await IntegrationTestDatabase.clearAllData();
  });

  afterAll(async () => {
    await IntegrationTestDatabase.cleanup();
  });
}