import { logger } from '../../utils/logger';
import db from '../../config/database';

export interface FinancialTransaction {
  id: string;
  tenant_id: string;
  type: 'PURCHASE' | 'SALE' | 'REFUND' | 'FEE';
  amount: number;
  currency: string;
  status: 'PENDING' | 'COMPLETED' | 'FAILED';
  created_at: Date;
  updated_at: Date;
}

export class FinanceService {
  static async recordTransaction(transaction: Omit<FinancialTransaction, 'id' | 'created_at' | 'updated_at'>): Promise<FinancialTransaction> {
    try {
      const newTransaction: FinancialTransaction = {
        ...transaction,
        id: `tx_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
        created_at: new Date(),
        updated_at: new Date()
      };
      
      // 这里应该插入数据库，但为了简化，我们只返回模拟数据
      logger.info(`[FinanceService] Recorded transaction: ${newTransaction.id}`);
      return newTransaction;
    } catch (error) {
      logger.error('Error recording transaction:', error);
      throw error;
    }
  }
  
  static async getTransactionById(transactionId: string): Promise<FinancialTransaction | null> {
    try {
      // 模拟获取交易记录
      return {
        id: transactionId,
        tenant_id: 'tenant_123',
        type: 'PURCHASE',
        amount: 100.00,
        currency: 'USD',
        status: 'COMPLETED',
        created_at: new Date(),
        updated_at: new Date()
      };
    } catch (error) {
      logger.error('Error getting transaction:', error);
      return null;
    }
  }
  
  static async getTransactionsByTenant(tenantId: string, limit: number = 10): Promise<FinancialTransaction[]> {
    try {
      // 模拟获取租户的交易记录
      return Array.from({ length: limit }, (_, i) => ({
        id: `tx_${Date.now()}_${i}`,
        tenant_id: tenantId,
        type: ['PURCHASE', 'SALE', 'REFUND', 'FEE'][i % 4] as any,
        amount: 50 + Math.random() * 200,
        currency: ['USD', 'CNY', 'EUR'][i % 3],
        status: 'COMPLETED',
        created_at: new Date(),
        updated_at: new Date()
      }));
    } catch (error) {
      logger.error('Error getting transactions:', error);
      return [];
    }
  }
  
  static async reconcileOrder(orderId: string): Promise<any> {
    try {
      // 模拟订单对账
      return {
        orderId,
        status: 'RECONCILED',
        amount: 100.00,
        currency: 'USD',
        timestamp: new Date()
      };
    } catch (error) {
      logger.error('Error reconciling order:', error);
      throw error;
    }
  }
  
  static async getBillPlayback(tenantId: string, params: any): Promise<any> {
    try {
      // 模拟账单回放
      return {
        tenantId,
        period: params.period || '2024-03',
        transactions: [],
        totalAmount: 5000.00,
        currency: 'USD'
      };
    } catch (error) {
      logger.error('Error getting bill playback:', error);
      throw error;
    }
  }
}