import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Discount, DiscountDocument } from 'src/schemas/discount.schema';
import { Model, Types } from 'mongoose';
import { CategoryService } from 'src/category/category.service';
import { ProductService } from 'src/product/product.service';
import { DiscountTypeService } from 'src/discount-type/discount-type.service';
import { CreateDiscountDto } from './dto/discount.dto';
import { CreateSellerResponse } from 'src/interfaces/request';
import { v4 as uuidv4 } from 'uuid';
import { ShopService } from 'src/shop/shop.service';

@Injectable()
export class DiscountService {
  constructor(
    @InjectModel(Discount.name)
    private readonly discountModel: Model<DiscountDocument>,
    private readonly shopService: ShopService,
    private readonly productService: ProductService,
    private readonly discountTypeService: DiscountTypeService,
  ) {}

  async creatDiscount(
    creatDiscountDto: CreateDiscountDto,
    user: any,
  ): Promise<CreateSellerResponse> {
    const newUuid: string = uuidv4();


    console.log("creatDiscountDto")
   console.log(creatDiscountDto)
    const existCategory = await this.discountTypeService.findDiscountType(creatDiscountDto.Type);
    if (existCategory.status !== 200 || !existCategory.data) {
      return {
        message: 'نوع تخفیف ثبت نشده است',
        status: 404,
        data: null,
      };
    }

    const existShop = await this.shopService.findShopSingle(creatDiscountDto.Shop);
    if (existShop.status !== 200 || !existShop.data) {
      return {
        message: 'فروشگاه ثبت نشده است',
        status: 404,
        data: null,
      };
    }
   
    if (!existShop.data.Seller) {
      return {
        message: 'اطلاعات فروشنده فروشگاه ناقص است',
        status: 500,
        data: null,
      };
    }

    const sellerId = new Types.ObjectId(user);
    const shopSellerId = existShop.data.Seller;

    if (!sellerId.equals(shopSellerId)) {
      return {
        message: 'این فروشنده مجاز به ثبت تخفیف برای این فروشگاه نیست',
        status: 403,
        data: null,
      };
    }

    const existProduct = await this.productService.findProductSingle(creatDiscountDto.Product);
    if (existProduct.status !== 200 || !existProduct.data) {
      return {
        message: 'محصول ثبت نشده است',
        status: 404,
        data: null,
      };
    }


    if (!existProduct.data.Shop.equals(existShop.data._id)) {
      return {
        message: 'این محصول در این فروشگاه ثبت نشده است',
        status: 400,
        data: null,
      };
    }

    try {
      const newDiscount = new this.discountModel({
        Shop: existShop.data._id,
        Product: existProduct.data._id,
        Type: existCategory.data._id,
        Description: creatDiscountDto.Description,
        StartDate: creatDiscountDto.Start,
        EndDate: creatDiscountDto.End,
        StartTime: creatDiscountDto.StartTime,
        EndTime: creatDiscountDto.EndTime,
        Radius: Number(creatDiscountDto.Radius),
        QRcode: "",
        Status: true,
        ID: newUuid,
      });

      await newDiscount.save();

      return {
        data: newDiscount,
        message: 'تخفیف با موفقیت ایجاد شد',
        status: 200,
      };
    } catch (e) {
      console.error('Error saving discount:', e);
      return {
        data: null,
        message: 'ثبت تخفیف با شکست مواجه شد',
        status: 500,
      };
    }
  }
}