const axios = require("axios");
const utils = require("./utils");

const HITS = Math.floor(30000 + Math.random() * 2000);

const conversions = {
    "": {unit: "stk", factor: 1},
    "dosen": {unit: "stk", factor: 1},
    "blatt": {unit: "stk", factor: 1},
    "flaschen": {unit: "stk", factor: 1},
    "l": {unit: "ml", factor: 1000},
    "liter": {unit: "ml", factor: 1000},
    "ml": {unit: "ml", factor: 1},
    "g": {unit: "g", factor: 1},
    "kg": {unit: "g", factor: 1000},
    "stk.": {unit: "stk", factor: 1},
};

exports.getCanonical = function(item, today) {
    let quantity = 1;
    let unit = '';
    let text = (item.price.basePrice?.text ?? "").trim().split('(')[0].replaceAll(',', '.').toLowerCase();
    let isWeighted = false;

    if(text === 'per kg') {
      isWeighted = true;
      unit = 'kg';
    }
    else {
        if(text.startsWith('bei') && text.search('je ') != -1)
            text = text.substr(text.search('je '))

        for (let s of ['ab ', 'je ', 'ca. ', 'z.b.: ', 'z.b. '])
            text = text.replace(s, '').trim()

        const regex = /^([0-9.x ]+)(.*)$/;
        const matches = text.match(regex);
        if(matches) {
            matches[1].split('x').forEach( (q)=> {
              quantity = quantity * parseFloat(q.split('/')[0])
            })
            unit = matches[2].split('/')[0].trim().split(' ')[0];
        }
        unit = unit.split('-')[0];
    }

    return utils.convertUnit({
        id: item.productId,
        name: `${item.keyfacts?.supplementalDescription?.concat(" ") ?? ""}${item.fullTitle}`,
        price: item.price.price,
        priceHistory: [{ date: today, price: item.price.price }],
        unit,
        quantity,
        url: `https://www.lidl.at${item.canonicalUrl}`,
    }, conversions, 'lidl');
}

exports.fetchData = async function() {
    const LIDL_SEARCH = `https://www.lidl.at/p/api/gridboxes/AT/de/?max=${HITS}`;
    return (await axios.get(LIDL_SEARCH)).data.filter(item => !!item.price.price);
}