'use strict';

const knex = require('./knex');

async function matchTags(rawTags) {
    const tagEntries = await knex('tags')
        .pluck('aliases.id')
        .whereIn('tags.name', rawTags.map(tag => tag.toLowerCase()))
        .where(function where() {
            this
                .whereNull('tags.alias_for')
                .orWhereNull('aliases.alias_for');
        })
        .join('tags as aliases', function join() {
            this
                .on('tags.alias_for', 'aliases.id')
                .orOn('tags.id', 'aliases.id');
        })
        .groupBy('aliases.id');

    return tagEntries;
}

module.exports = { matchTags };