// ==UserScript==
// @name         Bandcamp Downloader
// @namespace    https://github.com/qwhert/userscripts
// @version      1.1.1
// @description  Adds a download link to songs on Bandcamp
// @author       whqwert
// @match        https://*.bandcamp.com/*
// @icon         https://s4.bcbits.com/img/favicon/favicon-32x32.png
// @supportURL   https://github.com/qwhert/userscripts/issues
// @license      MIT
// @grant        GM_download
// @connect      t4.bcbits.com
// @run-at       document-end
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';
    const table = document.querySelectorAll('#track_table > tbody > tr');
    const adata = unsafeWindow.TralbumData || false;

    if (adata) {
        const albutton = document.querySelector('.share-collect-controls > ul');
        const downloadButtonHTML =
            `<li id="download-button">
                  <span class="bc-ui2" style="height: 12px; width: 15px; display: inline-block; background-image: url(data:image/svg+xml;base64,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); background-size: contain">
                  </span>
                  <span class="share-embed-label">
                        <button type="button">
                              Download
                        </button>
                  </span>
            </li>`
        function downloadSong(file, title) {
            GM_download({
                url: file,
                name: adata.artist + ' - ' + title + '.mp3',
                saveAs: true
            });
        }
        if (table.length) { // isAlbum
            const dlinks = document.getElementsByClassName('dl_link');
            adata.trackinfo.forEach((track, i) => {
                const link = dlinks[i]
                const file = track.file['mp3-128']
                const title = track.title

                link.innerHTML =
                    `<a
                    href="${file}"
                    title="${adata.artist + ' - ' + title}">
                    download
                </a>`
                link.firstChild.onclick = () => {
                    downloadSong(file, title);
                    return false;
                }
            })
        } else { // isSong
            const file = unsafeWindow.TralbumData.trackinfo[0].file['mp3-128']
            albutton.insertAdjacentHTML('beforeend', downloadButtonHTML);
            document.getElementById('download-button').onclick = () => {
                downloadSong(file, adata.current.title);
            }
        }
    }
})();