import { logger } from '../utils/logger';

export interface MerchantSettlement {
  id: string;
  merchantId: string;
  tenantId: string;
  shopId: string;
  periodStart: Date;
  periodEnd: Date;
  totalOrders: number;
  totalSales: number;
  platformFee: number;
  commission: number;
  netAmount: number;
  status: 'PENDING' | 'PROCESSING' | 'COMPLETED' | 'FAILED';
  paymentStatus: 'PENDING' | 'COMPLETED' | 'FAILED';
  traceId: string;
  taskId: string;
  businessType: 'TOC' | 'TOB';
  createdAt: Date;
  updatedAt: Date;
}

export interface SettlementItem {
  id: string;
  settlementId: string;
  orderId: string;
  amount: number;
  commissionRate: number;
  commissionAmount: number;
  platformFee: number;
  netAmount: number;
  status: 'INCLUDED' | 'EXCLUDED';
  createdAt: Date;
  updatedAt: Date;
}

export interface CreateSettlementParams {
  merchantId: string;
  tenantId: string;
  shopId: string;
  periodStart: Date;
  periodEnd: Date;
  traceId: string;
  taskId: string;
  businessType: 'TOC' | 'TOB';
}

export interface SettlementResult {
  success: boolean;
  settlement: MerchantSettlement;
  items: SettlementItem[];
  message: string;
}

export class MerchantSettlementService {
  /**
   * 初始化数据库表
   */
  static async initTable() {
    logger.info('🚀 MerchantSettlementService table initialized');
    // 这里可以添加数据库表初始化逻辑
  }

  /**
   * 创建结算单
   */
  static async createSettlement(params: CreateSettlementParams): Promise<SettlementResult> {
    logger.info(`[MerchantSettlementService] Creating settlement for merchant: ${params.merchantId}`, { traceId: params.traceId });
    
    // 这里可以添加创建结算单的逻辑
    
    const settlement: MerchantSettlement = {
      id: 'settlement_' + Date.now(),
      merchantId: params.merchantId,
      tenantId: params.tenantId,
      shopId: params.shopId,
      periodStart: params.periodStart,
      periodEnd: params.periodEnd,
      totalOrders: 10,
      totalSales: 1000,
      platformFee: 50,
      commission: 100,
      netAmount: 850,
      status: 'PENDING',
      paymentStatus: 'PENDING',
      traceId: params.traceId,
      taskId: params.taskId,
      businessType: params.businessType,
      createdAt: new Date(),
      updatedAt: new Date()
    };
    
    const items: SettlementItem[] = [
      {
        id: 'item_1',
        settlementId: settlement.id,
        orderId: 'order_1',
        amount: 100,
        commissionRate: 0.1,
        commissionAmount: 10,
        platformFee: 5,
        netAmount: 85,
        status: 'INCLUDED',
        createdAt: new Date(),
        updatedAt: new Date()
      }
    ];
    
    return {
      success: true,
      settlement,
      items,
      message: 'Settlement created successfully'
    };
  }

  /**
   * 处理结算
   */
  static async processSettlement(settlementId: string, traceId: string): Promise<MerchantSettlement> {
    logger.info(`[MerchantSettlementService] Processing settlement: ${settlementId}`, { traceId });
    // 这里可以添加处理结算的逻辑
    
    return {
      id: settlementId,
      merchantId: 'merchant_1',
      tenantId: 'tenant_1',
      shopId: 'shop_1',
      periodStart: new Date(),
      periodEnd: new Date(),
      totalOrders: 10,
      totalSales: 1000,
      platformFee: 50,
      commission: 100,
      netAmount: 850,
      status: 'COMPLETED',
      paymentStatus: 'COMPLETED',
      traceId,
      taskId: 'task_1',
      businessType: 'TOC',
      createdAt: new Date(),
      updatedAt: new Date()
    };
  }

  /**
   * 获取结算单
   */
  static async getSettlement(settlementId: string, traceId: string): Promise<MerchantSettlement | null> {
    logger.info(`[MerchantSettlementService] Getting settlement: ${settlementId}`, { traceId });
    // 这里可以添加获取结算单的逻辑
    return null;
  }

  /**
   * 获取商户结算历史
   */
  static async getMerchantSettlements(merchantId: string, tenantId: string, shopId: string, traceId: string): Promise<MerchantSettlement[]> {
    logger.info(`[MerchantSettlementService] Getting settlements for merchant: ${merchantId}`, { traceId });
    // 这里可以添加获取商户结算历史的逻辑
    return [];
  }

  /**
   * 取消结算
   */
  static async cancelSettlement(settlementId: string, traceId: string): Promise<MerchantSettlement> {
    logger.info(`[MerchantSettlementService] Cancelling settlement: ${settlementId}`, { traceId });
    // 这里可以添加取消结算的逻辑
    
    return {
      id: settlementId,
      merchantId: 'merchant_1',
      tenantId: 'tenant_1',
      shopId: 'shop_1',
      periodStart: new Date(),
      periodEnd: new Date(),
      totalOrders: 10,
      totalSales: 1000,
      platformFee: 50,
      commission: 100,
      netAmount: 850,
      status: 'FAILED',
      paymentStatus: 'FAILED',
      traceId,
      taskId: 'task_1',
      businessType: 'TOC',
      createdAt: new Date(),
      updatedAt: new Date()
    };
  }

  /**
   * 生成结算报表
   */
  static async generateSettlementReport(merchantId: string, startDate: Date, endDate: Date, traceId: string): Promise<any> {
    logger.info(`[MerchantSettlementService] Generating settlement report for merchant: ${merchantId}`, { traceId });
    // 这里可以添加生成结算报表的逻辑
    return {
      merchantId,
      startDate,
      endDate,
      totalSettlements: 5,
      totalAmount: 5000,
      averageAmount: 1000,
      reportDate: new Date()
    };
  }
}
