ecommerce-express-utils/services/promoCode/promoCode.js

A collection of handy express utilities for ecommerce

const getPromoCode = async (model, req, res, orderModel) => {
    try {
        const { promoCode } = req.params;
        const promotion = await model.findOne({ promoCode });

        if (!promotion || promotion.uses >= promotion.maxlimit) {
            return res.status(400).json({ message: 'This promo code does not exist or has reached its usage limit', });
        }

        const currentDate = new Date();
        const validStartDate = new Date(promotion.validStartDate);
        const validEndDate = new Date(promotion.validEndDate);

        if (currentDate < validStartDate || currentDate > validEndDate) {
            return res.status(400).json({ message: 'This promo code is not valid at the moment', });
        }

        if (promotion.promoType === 'unlimited') {
            return res.status(200).json(promotion);
        }

        let checkPromoCode;
        if (promotion.promoType === 'oneTime') {
            checkPromoCode = await orderModel.find({
                customer: req.customer._id,
                promoCode,
            });
        }

        if (checkPromoCode.length > 0) {
            return res.status(400).json({ message: 'This promo code has already been used' });
        } else {
            res.status(200).json(promotion);
        }

    } catch (error) {
        res.status(400).json({ error: error.message });
    }
};

export { getPromoCode };