const products = await Product.find({price: {$gt: 30}})

.sort('price')

.select('name price');

res.status(200).json({nbHits: products.length, products})

const {featured, company, name, sort, fields, numericFilters} = req.query;

const queryObject = {};

if (featured) {

queryObject.featured = featured === 'true';

}

if (company) {

queryObject.company = company;

}

if (name) {

queryObject.name = {$regex: name, $options: 'i'};

}

if (numericFilters) {

const operatorMap = {

'>': '$gt',

'>=': '$gte',

'=': '$eq',

'<': '$lt',

'<=': '$lte'

}

const regEx = /\b(<|>|>=|=|<|<=)\b/g;

let filters = numericFilters.replace(regEx, (match) => `-${operatorMap[match]}-`);

const options = ['price', 'rating'];

filters.split(',').forEach((item) => {

const [field, operator, value] = item.split('-')

if (options.includes(field)) {

queryObject[field] = {[operator]: Number(value)}

}

})

}

let result = Product.find(queryObject)

if (sort) {

const sortList = sort.split(',').join(' ');

result = result.sort(sortList)

} else {

result = result.sort('createdAt')

}

if (fields) {

const fieldsList = fields.split(',').join(' ');

result = result.select(fieldsList)

}

const page = Number(req.query.page) || 1;

const limit = Number(req.query.limit) || 10;

const skip = (page - 1) * limit;

result = result.skip(skip).limit(limit)

const products = await result;

res.status(200).json({nbHits: products.length, products})