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

export interface Bill {
  id: string;
  tenantId: string;
  shopId: string;
  type: 'FEATURE' | 'TRANSACTION' | 'SERVICE';
  amount: number;
  currency: string;
  status: 'PENDING' | 'PAID' | 'OVERDUE' | 'REFUNDED';
  dueDate: Date;
  paymentDate?: Date;
  relatedId: string; // 关联的功能激活ID或订单ID
  traceId: string;
  taskId: string;
  businessType: 'TOC' | 'TOB';
  createdAt: Date;
  updatedAt: Date;
}

export interface CreateBillParams {
  tenantId: string;
  shopId: string;
  type: 'FEATURE' | 'TRANSACTION' | 'SERVICE';
  amount: number;
  currency: string;
  relatedId: string;
  traceId: string;
  taskId: string;
  businessType: 'TOC' | 'TOB';
}

export interface BillResult {
  success: boolean;
  bill: Bill;
  message: string;
}

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

  /**
   * 创建账单
   */
  static async createBill(params: CreateBillParams): Promise<BillResult> {
    logger.info(`[BillingService] Creating bill for ${params.type}`, { traceId: params.traceId });
    
    // 计算到期日期（默认30天后）
    const dueDate = new Date();
    dueDate.setDate(dueDate.getDate() + 30);
    
    const bill: Bill = {
      id: 'bill_' + Date.now(),
      tenantId: params.tenantId,
      shopId: params.shopId,
      type: params.type,
      amount: params.amount,
      currency: params.currency,
      status: 'PENDING',
      dueDate,
      relatedId: params.relatedId,
      traceId: params.traceId,
      taskId: params.taskId,
      businessType: params.businessType,
      createdAt: new Date(),
      updatedAt: new Date()
    };
    
    // 这里可以添加创建账单的逻辑
    
    return {
      success: true,
      bill,
      message: 'Bill created successfully'
    };
  }

  /**
   * 标记账单为已支付
   */
  static async markAsPaid(billId: string, traceId: string): Promise<Bill> {
    logger.info(`[BillingService] Marking bill as paid: ${billId}`, { traceId });
    // 这里可以添加标记账单为已支付的逻辑
    
    return {
      id: billId,
      tenantId: 'tenant_1',
      shopId: 'shop_1',
      type: 'FEATURE',
      amount: 99,
      currency: 'USD',
      status: 'PAID',
      dueDate: new Date(),
      paymentDate: new Date(),
      relatedId: 'activation_1',
      traceId,
      taskId: 'task_1',
      businessType: 'TOC',
      createdAt: new Date(),
      updatedAt: new Date()
    };
  }

  /**
   * 获取账单列表
   */
  static async getBills(tenantId: string, shopId: string, traceId: string): Promise<Bill[]> {
    logger.info(`[BillingService] Getting bills for tenant: ${tenantId}`, { traceId });
    // 这里可以添加获取账单列表的逻辑
    return [];
  }

  /**
   * 获取账单详情
   */
  static async getBill(billId: string, traceId: string): Promise<Bill | null> {
    logger.info(`[BillingService] Getting bill: ${billId}`, { traceId });
    // 这里可以添加获取账单详情的逻辑
    return null;
  }

  /**
   * 生成账单报表
   */
  static async generateBillReport(tenantId: string, startDate: Date, endDate: Date, traceId: string): Promise<any> {
    logger.info(`[BillingService] Generating bill report for tenant: ${tenantId}`, { traceId });
    // 这里可以添加生成账单报表的逻辑
    return {
      tenantId,
      startDate,
      endDate,
      totalBills: 5,
      totalAmount: 500,
      paidAmount: 400,
      overdueAmount: 100,
      reportDate: new Date()
    };
  }

  /**
   * 处理逾期账单
   */
  static async processOverdueBills(traceId: string): Promise<number> {
    logger.info('[BillingService] Processing overdue bills', { traceId });
    // 这里可以添加处理逾期账单的逻辑
    return 0; // 返回处理的逾期账单数量
  }
}
