All files / src/modules/coupons coupons.service.ts

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import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Coupon, CouponDocument } from '../../database/schemas/coupon.schema';
 
@Injectable()
export class CouponsService {
  constructor(
    @InjectModel(Coupon.name) private couponModel: Model<CouponDocument>,
  ) {}
 
  async findAll(filters: {
    retailer?: string;
    category?: string;
    page: number;
    limit: number;
  }): Promise<{
    coupons: CouponDocument[];
    total: number;
    page: number;
    totalPages: number;
  }> {
    const query: any = { status: 'active' };
    
    Iif (filters.retailer) {
      // Would need to populate retailer and filter by name
      // For now, assume retailer is the ObjectId
      query.retailerId = filters.retailer;
    }
    
    Iif (filters.category) {
      query['conditions.categories'] = filters.category;
    }
 
    const skip = (filters.page - 1) * filters.limit;
    
    const [coupons, total] = await Promise.all([
      this.couponModel
        .find(query)
        .populate('retailerId')
        .sort({ priority: -1, createdAt: -1 })
        .skip(skip)
        .limit(filters.limit)
        .exec(),
      this.couponModel.countDocuments(query),
    ]);
 
    return {
      coupons,
      total,
      page: filters.page,
      totalPages: Math.ceil(total / filters.limit),
    };
  }
 
  async findOne(id: string): Promise<CouponDocument | null> {
    return this.couponModel.findById(id).populate('retailerId').exec();
  }
 
  async create(couponData: Partial<Coupon>): Promise<CouponDocument> {
    const newCoupon = new this.couponModel({
      ...couponData,
      createdAt: new Date(),
      updatedAt: new Date(),
    });
    return newCoupon.save();
  }
 
  async update(id: string, updateData: Partial<Coupon>): Promise<CouponDocument | null> {
    return this.couponModel.findByIdAndUpdate(
      id, 
      { ...updateData, updatedAt: new Date() }, 
      { new: true }
    ).exec();
  }
 
  async delete(id: string): Promise<boolean> {
    const result = await this.couponModel.findByIdAndDelete(id).exec();
    return !!result;
  }
 
  async findByCode(code: string, retailerId?: string): Promise<CouponDocument | null> {
    const query: any = { code, status: 'active' };
    Iif (retailerId) {
      query.retailerId = retailerId;
    }
    return this.couponModel.findOne(query).populate('retailerId').exec();
  }
 
  async findActiveCoupons(): Promise<CouponDocument[]> {
    return this.couponModel.find({
      status: 'active',
      validFrom: { $lte: new Date() },
      validUntil: { $gte: new Date() },
    }).populate('retailerId').exec();
  }
 
  async updateCouponPerformance(
    id: string, 
    performance: {
      usageCount?: number;
      savingsGenerated?: number;
      conversionRate?: number;
    }
  ): Promise<void> {
    await this.couponModel.findByIdAndUpdate(id, {
      $inc: {
        'performance.usageCount': performance.usageCount || 0,
        'performance.savingsGenerated': performance.savingsGenerated || 0,
      },
      ...(performance.conversionRate && {
        'performance.conversionRate': performance.conversionRate,
      }),
      updatedAt: new Date(),
    }).exec();
  }
 
  async expireCoupons(): Promise<number> {
    const result = await this.couponModel.updateMany(
      {
        status: 'active',
        validUntil: { $lt: new Date() },
      },
      {
        status: 'expired',
        updatedAt: new Date(),
      }
    ).exec();
 
    return result.modifiedCount;
  }
 
  async getCouponsByRetailer(retailerId: string): Promise<CouponDocument[]> {
    return this.couponModel.find({
      retailerId,
      status: 'active',
    }).exec();
  }
 
  async getCouponsByCategory(category: string): Promise<CouponDocument[]> {
    return this.couponModel.find({
      'conditions.categories': category,
      status: 'active',
    }).populate('retailerId').exec();
  }
}