import * as functions from 'firebase-functions';
import Fuse from 'fuse.js';
import * as admin from 'firebase-admin';

admin.initializeApp();

export const search = functions.https.onRequest(async (req, res) => {
    res = res.set('Access-Control-Allow-Origin', '*').status(200);

    const ingredients = await admin.database().ref('ff/').once('value').then(snapshot => snapshot.val());

    if (!ingredients) {
        res.send([]);
        return;
    }
    const fullData = Object.values(ingredients);

    const searchText = req.query.query as string;

    if (typeof searchText !== 'string'
     || !searchText
     || ['null', 'undefined'].includes(searchText)) {
        res.status(400).send([ 'searchText' ]);
        return;
    }

    if (!fullData.length) {
        res.send([]);
        return;
    }

    const fuse = new Fuse(fullData, {
        keys: [ 'synonyms' ],
        shouldSort: false,
        threshold: 0.2,
        location: 0,
        distance: 100,
        minMatchCharLength: 1,
    });

    const resultIngredients = fuse.search(searchText);

    res.send(resultIngredients);
});