import ProductModel from '../models/product-model.js';
import ApiError from '../exceptions/api-error.js';
import rabbitMqService from '../rabbitmq.js';
import { Op } from 'sequelize';

class ProductService {
    async createProduct(plu, name) {
        const existingProduct = await ProductModel.findOne({ where: { plu }});
        if (existingProduct) {
            throw ApiError.BadRequest('Продукт с таким PLU уже существует');
        }

        const product = await ProductModel.create({ plu, name });

        rabbitMqService.sendToQueue({ 
            action: 'createProduct', 
            shop_id: null,
            plu: product.plu,
            oldData: null,
            newData: product 
        });
            
        return product;
    }

    async getProducts(
        plu = null, 
        name = null, 
        page = 1, 
        pageSize = 10
    ) {
        const offset = (page - 1) * pageSize;
        const limit = pageSize;
        const where = {};

        if(plu) where.plu = plu;
        if(name) where.name = {[Op.iLike]: `%${name}%`};

        const products = await ProductModel.findAndCountAll({ limit, offset, where });
        const totalPages = Math.ceil(products.count / pageSize); 

        rabbitMqService.sendToQueue({ 
            action: 'getProducts', 
            shop_id: null,
            plu,
            oldData: null,
            newData: null
        });
    
         return {
            products: products.rows,
            page,
            pageSize,
            totalPages,
            totalProducts: products.count
          }
    }
}

export default new ProductService();