// storage for promises with the same ids so the same request is not issued twice
const translations = {};

export function translateIdPatterns(idPatterns)
{
    if (!translations[idPatterns.join(',')]) {
        translations[idPatterns.join(',')] = getJSON(idPatterns);
    }
    return translations[idPatterns.join(',')];
}

export function arrayFromPaths(units)
{
    const result = {};
    for (const [key, value] of Object.entries(units)) {
        let cur = result;
        const parts = key.split('.'),
            lastPart = parts.pop();

        parts.forEach(function(elem){
            cur[elem] = cur[elem] || {};
            cur = cur[elem];
        });
        cur[lastPart] = value;
    }
    return result;
}

async function getJSON(idPatterns)
{
    const uri = new URL(document.documentElement.dataset.xliffUri, document.location);
    uri.searchParams.set(document.documentElement.dataset.xliffParameter, idPatterns);
    const response = await fetch(uri, {headers: {
            'Accept': 'application/json',
            'Accept-Language': document.documentElement.lang,
        }});
    if (!response.ok) {
        return Promise.reject('Unexpected server response');
    }
    return await response.json();
}