var windowWidth = window.innerWidth;
var menu = null;
var menuOffcanvas = null;
var is_mobile = function() {
    return !(window.getComputedStyle(document.getElementById('is_mobile')).display === "none");
};

var createEventsListener = function() {

}

async function getPDFBlobFromCache(cacheUrl) {
    const cache = await caches.open('pdf');
    let responsePdf = await cache.match(cacheUrl);

    if(!responsePdf) {
        return null;
    }

    let pdfBlob = await responsePdf.blob();

    return pdfBlob;
}

async function uploadFromUrl(url) {
    history.replaceState({}, '', '/metadata');
    var response = await fetch(url);
    if(response.status != 200) {
        return;
    }
    var pdfBlob = await response.blob();

    if(pdfBlob.type != 'application/pdf' && pdfBlob.type != 'application/octet-stream') {
        return;
    }
    let dataTransfer = new DataTransfer();
    let filename = url.replace(/^.*\//, '');
    dataTransfer.items.add(new File([pdfBlob], filename, {
        type: 'application/pdf'
    }));
    document.getElementById('input_pdf_upload').files = dataTransfer.files;
    document.getElementById('input_pdf_upload').dispatchEvent(new Event("change"));
}

var pageUpload = async function() {
    document.querySelector('body').classList.remove('bg-light');
    document.getElementById('input_pdf_upload').value = '';
    document.getElementById('page-upload').classList.remove('d-none');
    document.getElementById('page-metadata').classList.add('d-none');
    document.getElementById('input_pdf_upload').focus();
    const cache = await caches.open('pdf');
    document.getElementById('input_pdf_upload').addEventListener('change', async function(event) {
            if(document.getElementById('input_pdf_upload').files[0].size > maxSize) {

            alert("Le PDF ne doit pas dépasser " + Math.round(maxSize/1024/1024) + " Mo");
            document.getElementById('input_pdf_upload').value = "";
            return;
        }
        let filename = document.getElementById('input_pdf_upload').files[0].name;
        let response = new Response(document.getElementById('input_pdf_upload').files[0], { "status" : 200, "statusText" : "OK" });
        let urlPdf = '/pdf/'+filename;
        await cache.put(urlPdf, response);
        history.pushState({}, '', '/metadata#'+filename);
        pageMetadata(urlPdf)
    });
}

var pageMetadata = async function(url) {
    let filename = url.replace('/pdf/', '');
    document.title = filename + ' - ' + document.title;
    document.querySelector('body').classList.add('bg-light');
    document.getElementById('page-upload').classList.add('d-none');
    document.getElementById('page-metadata').classList.remove('d-none');
    menu = document.getElementById('sidebarTools');
    menuOffcanvas = new bootstrap.Offcanvas(menu);
    responsiveDisplay();

    let pdfBlob = await getPDFBlobFromCache(url);
    if(!pdfBlob) {
        document.location = '/metadata';
        return;
    }

    createEventsListener();
    loadPDF(pdfBlob, filename, nbPDF);
};

(function () {
    if(window.location.hash && window.location.hash.match(/^\#http/)) {
        let hashUrl = window.location.hash.replace(/^\#/, '');
        pageUpload();
        uploadFromUrl(hashUrl);
    } else if(window.location.hash) {
        pageMetadata('/pdf/'+window.location.hash.replace(/^\#/, ''));
    } else {
        pageUpload();
    }
    window.addEventListener('hashchange', function() {
        window.location.reload();
    })
})();