import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../prisma/prisma.service';
import { PaymentService } from '../payment/payment.service';

@Injectable()
export class OrdersService {
  constructor(
    private prisma: PrismaService,
    private paymentService: PaymentService,
  ) {}

  async create(userId: number, data: { amount: number; planType: string; payChannel?: string; tradeType?: string; openid?: string }) {
    const orderNo = `YZR${Date.now()}${Math.random().toString(36).slice(2, 8).toUpperCase()}`;

    const order = await this.prisma.order.create({
      data: {
        orderNo,
        userId,
        amount: data.amount,
        planType: data.planType,
        payChannel: data.payChannel || 'wxpay',
      },
    });

    // If paying via WeChat, create unified order
    if (data.payChannel === 'wxpay' || !data.payChannel) {
      try {
        const planLabels: Record<string, string> = {
          MONTHLY: '宇之然AI月卡会员',
          YEARLY: '宇之然AI年卡会员',
        };
        const payResult = await this.paymentService.createUnifiedOrder({
          description: planLabels[data.planType] || '宇之然AI会员充值',
          outTradeNo: orderNo,
          amount: data.amount,
          tradeType: (data.tradeType as 'JSAPI' | 'NATIVE' | 'MWEB') || 'NATIVE',
          openid: data.openid,
        });
        // Mock 模式下自动完成支付闭环（NATIVE mock 无需扫码）
        if (payResult?.codeUrl === 'mock://pay') {
          await this.paymentService.completeMockPayment(orderNo);
        }
        return { order, payResult };
      } catch {
        return { order, payResult: null };
      }
    }

    return { order };
  }

  async findByUser(userId: number, params: { page?: number; pageSize?: number }) {
    const page = Number(params.page ?? 1);
    const pageSize = Number(params.pageSize ?? 20);
    const [items, total] = await Promise.all([
      this.prisma.order.findMany({
        where: { userId },
        skip: (page - 1) * pageSize,
        take: pageSize,
        orderBy: { createdAt: 'desc' },
      }),
      this.prisma.order.count({ where: { userId } }),
    ]);
    return { items, total, page, pageSize };
  }

  async findByOrderNo(orderNo: string) {
    return this.prisma.order.findUnique({ where: { orderNo } });
  }

  async getCurrentSubscription(userId: number) {
    const now = new Date();
    return this.prisma.subscription.findFirst({
      where: {
        userId,
        status: 'ACTIVE',
        endDate: { gt: now },
      },
      orderBy: { endDate: 'desc' },
    });
  }

  async getSubscriptions(userId: number) {
    return this.prisma.subscription.findMany({
      where: { userId },
      orderBy: { createdAt: 'desc' },
    });
  }
}