import { DataSource } from 'typeorm';
import { vi, beforeEach, afterEach, afterAll } from 'vitest';

/**
 * 集成测试数据库工具类 - 使用真实PostgreSQL数据库
 */
export class IntegrationTestDatabase {
  private static dataSource: DataSource | null = null;

  /**
   * 初始化集成测试数据库
   */
  static async initialize(): Promise<DataSource> {
    if (this.dataSource?.isInitialized) {
      return this.dataSource;
    }

    // 使用环境变量中的测试数据库配置
    const databaseUrl = process.env.TEST_DATABASE_URL ||
                       process.env.DATABASE_URL?.replace('d8dai', 'test_d8dai') ||
                       'postgresql://postgres:test_password@localhost:5432/test_d8dai';

    this.dataSource = new DataSource({
      type: 'postgres',
      url: databaseUrl,
      synchronize: true,
      dropSchema: true, // 每次测试都重新创建schema
      logging: false,
      entities: [
        // 导入实际实体
        (await import('../modules/users/user.entity')).UserEntity,
        (await import('../modules/users/role.entity')).Role
      ]
    });

    await this.dataSource.initialize();
    return this.dataSource;
  }

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

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

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

    const queryRunner = this.dataSource.createQueryRunner();
    await queryRunner.connect();

    try {
      // 获取所有实体
      const entities = this.dataSource.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;
      });

      // 清空所有表数据
      for (const entity of sortedEntities) {
        const repository = this.dataSource.getRepository(entity.name);
        await repository.clear();
      }
    } finally {
      await queryRunner.release();
    }
  }
}

/**
 * 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();
  });
}