backend/controllers/productController.js

const ProductModel = require('../models/productModel');

exports.getProducts = async (req, res, next) => {
    try {
        let query = {};
        
        if (req.query.keyword) {
            query.name = { 
                $regex: req.query.keyword,
                $options: 'i'
            };
        }
        
        if (req.query.category) {
            query.category = req.query.category;
        }
        
        if (req.query.trending === 'true') {
            query.ratings = { $gte: 4.0 };
        }
        
        if (req.query.minPrice || req.query.maxPrice) {
            query.price = {};
            if (req.query.minPrice) query.price.$gte = parseFloat(req.query.minPrice);
            if (req.query.maxPrice) query.price.$lte = parseFloat(req.query.maxPrice);
        }
        
        const products = await ProductModel.find(query);
        res.json({
            success: true,
            products
        });
    } catch (error) {
        res.status(500).json({
            success: false,
            message: 'Unable to get products',
            error: error.message
        });
    }
}

exports.getSingleProduct = async (req, res, next) => {
    try {
        const product = await ProductModel.findById(req.params.id);
        res.json({
            success: true,
            product
        })
    } catch (error) {
        res.status(404).json({
            success: false,
            message: 'Unable to get Product with that ID'
        })
    }
}

exports.getRecommendedProducts = async (req, res, next) => {
    try {
        const products = await ProductModel.aggregate([
            { $sample: { size: 8 } }
        ]);
        res.json({
            success: true,
            products
        })
    } catch (error) {
        res.status(500).json({
            success: false,
            message: 'Unable to get recommended products'
        })
    }
}

exports.getRelatedProducts = async (req, res, next) => {
    try {
        const { productId } = req.params;
        const product = await ProductModel.findById(productId);
        
        if (!product) {
            return res.status(404).json({
                success: false,
                message: 'Product not found'
            });
        }
        
        const relatedProducts = await ProductModel.find({
            category: product.category,
            _id: { $ne: productId }
        }).limit(4);
        
        res.json({
            success: true,
            products: relatedProducts
        })
    } catch (error) {
        res.status(500).json({
            success: false,
            message: 'Unable to get related products'
        })
    }
}