/* 
 * Copyright (C) 2018 Champs Libres Cooperative <info@champs-libres.coop>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

var mime = require('mime-types') 

var download_report = (url, container) => {
    var download_text = container.dataset.downloadText,
        alias = container.dataset.alias;
    
    window.fetch(url, { credentials: 'same-origin' })
        .then(response => {
            if (!response.ok) {
                throw Error(response.statusText);
            }

            return response.blob();
        }).then(blob => {
            
            var content = URL.createObjectURL(blob),
                link = document.createElement("a"),
                type = blob.type,
                hasForcedType = 'mimeType' in container.dataset,
                extension;
                
            if (hasForcedType) {
                // force a type
                type = container.dataset.mimeType;
                blob = new Blob([ blob ], { 'type': type });
                content = URL.createObjectURL(blob);
            }
                
            extension = mime.extension(type);

            link.appendChild(document.createTextNode(download_text));
            link.classList.add("sc-button", "btn-action");
            link.href = content;
            link.download = alias;
            if (extension !== false) {
                link.download = link.download + '.' + extension;
            }
            container.innerHTML = "";
            container.appendChild(link);
        }).catch(function(error) {
            console.log(error);
            var problem_text = 
                    document.createTextNode("Problem during download");

            container
                .replaceChild(problem_text, container.firstChild);
        });
};

module.exports = download_report;