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

const conversions = {
    'G': { unit: 'g', factor: 1 },
    'KG': { unit: 'g', factor: 1000 },
    'L': { unit: 'ml', factor: 1000 },
    'ML':   { unit: 'ml', factor: 1 },
    'STK': { unit: 'stk', factor: 1 },
    'Stück': { unit: 'stk', factor: 1 },
    'kg': { unit: 'g', factor: 1000 },
    'l': { unit: 'ml', factor: 1000 },
    '100ml': { unit: 'ml', factor: 100 },
    'WG': { unit: 'wg', factor: 1 },
    '100g': { unit: 'g', factor: 100 },
    'm': { unit: 'cm', factor: 100 },
    'ml': { unit: 'ml', factor: 1 },
};

exports.getCanonical = function(item, today) {
    let price, unit, quantity;
    if (item.masterValues["quantity-selector"]) {
        const [str_price, str_unit] = item.masterValues["price-per-unit"].split('/');
        price = parseFloat(str_price.replace("€", ""));
    }
    else {
        price = item.masterValues.price;
    }
    if("short-description-3" in item.masterValues) {
        let [rawQuantity, rawUnit] = item.masterValues["short-description-3"].replace(" EINWEG", "").replace(" MEHRWEG", "").trim().split(' ');
        const conv = conversions[rawUnit];
        quantity = parseFloat(rawQuantity.replace(',','.')) * conv.factor;
        unit = conv.unit;
    }
    else{
      // use price per unit to calculate quantity (less accurate)
      let [unitPrice, rawUnit] = item.masterValues['price-per-unit'].split('/');
      unitPrice = parseFloat(unitPrice.replace("€", ""));
      const conv = conversions[rawUnit];
      if(conv === undefined)
          console.error(`Unknown unit in spar: ${rawUnit}`)
      quantity = Math.round(price / unitPrice * conv.factor)
      unit = conv.unit;
    }
    return {
        id: item.masterValues["code-internal"],
        sparId: item.masterValues["product-number"],
        name: item.masterValues.title + " " + item.masterValues["short-description"],
        price,
        priceHistory: [{ date: today, price }],
        unit,
        quantity,
        bio: item.masterValues.biolevel === "Bio"
    };
}

exports.fetchData = async function() {
    const SPAR_SEARCH = `https://search-spar.spar-ics.com/fact-finder/rest/v4/search/products_lmos_at?query=*&q=*&page=1&hitsPerPage=${HITS}`;
    const rawItems = (await axios.get(SPAR_SEARCH)).data.hits;
    return rawItems?.hits || rawItems;
}