/**
 * Fetches CSRF Token from page
 */
function getCsrfToken() {
    return { 'X-XSRF-TOKEN': document.getElementsByName('__RequestVerificationToken')[0].value }
}

/**
 * Save signature data to server
 * @param {any} envelopeKey
 * @param {any} annotations
 */
function postEnvelope(annotations) {
    const token = getCsrfToken()
    const options = {
        credentials: 'include',
        method: 'POST',
        headers: {
            ...token,
            'Content-Type': 'application/json; charset=utf-8'
        },
        body: JSON.stringify(annotations)
    }

    return fetch(`/api/annotation`, options)
}

async function setLanguage(language) {

    const hasLang = await fetch('/api/localization/lang', {
        method: 'GET',
        headers: {
            'Content-Type': 'application/json'
        }
    })
        .then(res => res.json())
        .then(langs => langs.includes(language))
        .catch(err => false);

    if (hasLang)
        return await fetch(`/api/localization/lang/${language}`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' }
        })
            .then(response => {
                if (response.redirected)
                    window.location.href = response.url;
                else if (!response.ok)
                    return Promise.reject('Failed to set language');
            });
}

async function logout() {
    return await fetch(`/auth/logout`, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        }
    }).then(res => {
        if (res.ok)
            window.location.href = "/";
    });
}


async function getAnnotationParams(leftInInch = 0, topInInch = 0, inchToPointFactor = 72) {

    const annotParams = await fetch(`${window.location.origin}/api/Config/Annotations`, {
        credentials: 'include',
        method: 'GET'
    })
        .then(res => res.json());

    for (var key in annotParams) {
        var annot = annotParams[key];
        annot.width *= inchToPointFactor;
        annot.height *= inchToPointFactor;
        annot.left += leftInInch - 0.7;
        annot.left *= inchToPointFactor;
        annot.top += topInInch - 0.5;
        annot.top *= inchToPointFactor;
    }
    return annotParams;
}