'use strict';

const config = require('config');

// pick {photoLimit} photos evenly distributed photos from a set with {photoTotal} photos, return array of indexes starting at 1
function pluckPhotos(photos, release, specifiedLimit) {
    const limit = specifiedLimit || config.media.limit;

    if (photos.length <= limit) {
        return photos;
    }

    const plucked = [1]
        .concat(
            Array.from({ length: limit }, (value, index) => Math.round((index + 1) * (photos.length / (limit)))),
        );

    return Array.from(new Set(plucked)).map(photoIndex => photos[photoIndex - 1]); // remove duplicates, may happen when photo total and photo limit are close
}

module.exports = pluckPhotos;