// ==UserScript==
// @name         Panopto-Video-DL
// @namespace    https://github.com/Panopto-Video-DL
// @description  Video downloader for Panopto
// @icon         https://t0.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=https://panopto.com&size=96
// @author       Panopto-Video-DL
// @version      3.5.1
// @copyright    2021, Panopto-Video-DL
// @license      MIT
// @homepage     https://github.com/Panopto-Video-DL/Panopto-Video-DL-browser
// @homepageURL  https://github.com/Panopto-Video-DL/Panopto-Video-DL-browser
// @supportURL   https://github.com/Panopto-Video-DL/Panopto-Video-DL-browser/issues
// @require      https://greasyfork.org/scripts/401626-notify-library/code/Notify%20Library.js
// @match        https://*.panopto.com/Panopto/Pages/Viewer.aspx?*id=*
// @match        https://*.panopto.eu/Panopto/Pages/Viewer.aspx?*id=*
// @match        https://*.panopto.com/Panopto/Pages/Embed.aspx?*id=*
// @match        https://*.panopto.eu/Panopto/Pages/Embed.aspx?*id=*
// @match        https://*.panopto.com/Panopto/Pages/Sessions/List.aspx*
// @match        https://*.panopto.eu/Panopto/Pages/Sessions/List.aspx*
// @connect      panopto.com
// @connect      panopto.eu
// @grant        GM_addStyle
// @grant        GM_setClipboard
// @grant        GM_openInTab
// @grant        GM_registerMenuCommand
// @noframes
// @downloadURL none
// ==/UserScript==

/* globals Notify */

(function () {
  'use strict';

  addStyle('#Panopto-Video-DL{position:fixed;top:10%;left:50%;width:70%;padding:2em 3em 1em;background-color:#2d3436;transform:translateX(-50%);z-index:1050}#Panopto-Video-DL *{margin-bottom:10px;color:#fff!important;font-size:18px;}#Panopto-Video-DL > div {margin-top: 1em;}#Panopto-Video-DL ul,#Panopto-Video-DL ol,#Panopto-Video-DL li{margin:0 .5em;padding:0 .5em;list-style:decimal}#Panopto-Video-DL button{margin-left:5px;margin-right:5px;color:#000!important;font-size:16px;}#Panopto-Video-DL p{margin-top:0.5em;}#Panopto-Video-DL input{color:black!important;}#Panopto-Video-DL textarea{width:100%;color:black!important;resize:vertical;white-space:nowrap;}')

  if (location.pathname.includes('/List.aspx')) {
    log('Service started');

    const button = document.createElement('button');
    button.className = 'css-t83cx2 css-tr3oo4 css-coghg4';
    button.role = 'button';
    button.style.marginLeft = '0.5rem';
    button.innerHTML = '<span class="material-icons css-6xugel" style="font-size: 18px;margin-bottom:-0.25rem;">file_download</span>Download';

    button.addEventListener('click', e => {
      e.preventDefault();
      e.stopPropagation();

      let _t;
      const list = (_t = document.querySelectorAll('#listViewContainer tbody > tr a.detail-title')).length ?
            _t : (_t = document.querySelectorAll('#detailsTable tbody > tr a.detail-title')).length ?
            _t : (_t = document.querySelectorAll('#thumbnailGrid > li a.detail-title')).length ?
            _t : null;
      if (!list) {
        log('No videos found', 'error');
        new Notify({
          text: 'No videos found',
          type: 'error'
        }).show();
        return;
      }

      const n = new Notify({
        text: 'Getting links. Please wait',
        type: 'info',
        timeout: 2000
      });
      n.show();

      const requestsList = [...list].map(item => {
        let videoId = new URL(item.getAttribute('href')).searchParams.get('id');
        const videoTitle = item.textContent.trim();
        return requestDeliveryInfo(videoId)
          .catch(error => {
            new Notify({
              text: 'Failed to get lesson link for "' + videoTitle + '"',
              type: 'error',
              timeout: null
            }).show();
          });
      });

      Promise.allSettled(requestsList)
        .then(responses => {
          // log(responses)
          n.close();
          let copyText = '';
          responses.forEach(response => {
            if (response.status == 'fulfilled' && response.value) {
              const streamUrl = response.value?.[0];
              if (streamUrl)
                copyText += streamUrl + '\n';
            }
          });
          if (copyText !== '')
            copyToClipboard(copyText);
        });
    });

    document.querySelector('#actionHeader button')?.parentElement.appendChild(button);
  }
  else if (location.pathname.includes('/Viewer.aspx')) {
    log('Service started');

    const button = document.createElement('a');
    button.href = '#';
    button.innerHTML = '<span class="material-icons" style="font-size:15px;margin-bottom:-0.25rem;">file_download</span> Download';
    button.classList = 'event-tab-header';
    button.style = 'display:inline-flex;align-items:center;position:absolute;bottom:30px;padding:5px 10px;text-decoration:none;cursor:pointer;';

    button.addEventListener('click', e => {
      e.preventDefault();
      e.stopPropagation();

      getVideoDownloadLink();
    });
    document.querySelector('#eventTabControl').appendChild(button);

    if (typeof GM_registerMenuCommand !== 'undefined')
      GM_registerMenuCommand('Download', () => getVideoDownloadLink());
  }
  else if (location.pathname.includes('/Embed.aspx')) {
    const button = document.createElement('div');
    button.role = 'button';
    button.title = 'Download';
    button.classList = 'button-control material-icons';
    button.innerHTML = '<span class="material-icons">file_download</span>';

    button.addEventListener('click', e => {
      e.preventDefault();
      e.stopPropagation();

      getVideoDownloadLink();
    });

    // document.querySelector('#navigationControls')?.appendChild(button);
    const searcher = () => setTimeout(() => {
      const nav = document.querySelector('#navigationControls');
      if (!nav) return searcher();
      nav.appendChild(button);
    }, 1_000);
    searcher();

    if (typeof GM_registerMenuCommand !== 'undefined')
      GM_registerMenuCommand('Download', () => getVideoDownloadLink());
  }


  // Functions
  function getVideoDownloadLink() {
      const url = new URL(location.href)
      const videoId = url.searchParams.get('id');
      if (!videoId) {
        new Notify({
          text: 'Failed to get Lesson ID.',
          type: 'error',
          timeout: null
        }).show();
        return;
      }

      const n = new Notify({
        text: 'Getting links. Please wait',
        type: 'info',
        timeout: 2000
      });
      n.show();

      requestDeliveryInfo(videoId)
        .then(_streams => {
          const streamUrl = _streams[0];
          const streams = _streams[1];

          if (streamUrl.endsWith('master.m3u8') || streamUrl.match(/\.panobf\d+/)) {
            if (localStorage.getItem('popup-viewed') != 'true')
              showModal('<h1 style="text-align:center;font-size:30px;">READ ME</h1> <p>To download the video follow these steps:</p> <ol><li>Download this program from <a href="https://github.com/Panopto-Video-DL/Panopto-Video-DL" target="_blank">GitHub</a> (No installation needed) and open it</li> <li>Paste the automatically copied link</li> <li>Set the destination folder</li> <li>Wait for the download to finish</li> </ol> <p style="text-align:center;"> <button onclick="this.parentElement.parentElement.remove();">Close</button> <button onclick="localStorage.setItem(\'popup-viewed\', true);this.parentElement.parentElement.remove();">Close and don\'t show again</button> </p>');

            copyToClipboard(streamUrl);
          }
          else {
            if (typeof GM_openInTab !== 'undefined')
              GM_openInTab(streamUrl, false);
            else
              window.open(streamUrl);
          }

          if (streams.length && localStorage.getItem('other-source-viewed') != 'true') {
            const modal = showModal('<h2 style="font-size:20px;">Download another source video</h2><ul></ul><p style="text-align:center;"><button onclick="this.parentElement.parentElement.remove();">Close</button><button onclick="localStorage.setItem(\'other-source-viewed\', true);this.parentElement.parentElement.remove();">Close and don\'t show again</button></p>');
            streams.forEach((value, index) => {
              const li = document.createElement('li');
              li.innerHTML = (value.Name?.replace(/-?(\d{8}T\d+Z)+((.)?(\w+))?/g, '').replace(/_/g, ' ') || 'Stream ' + (index + 1)) + '<button>Copy</button>';
              li.querySelector('button').addEventListener('click', (e) => { copyToClipboard(value.StreamUrl); })
              modal.querySelector('ul').appendChild(li);
            });
          }
        })
        .catch(error => {
          new Notify({
            text: 'Failed to get lesson link',
            type: 'error',
            timeout: null
          }).show();
        })
        .finally(() => n.close());
    }

  function requestDeliveryInfo(videoId) {
    return fetch(
      location.origin + '/Panopto/Pages/Viewer/DeliveryInfo.aspx', {
      method: 'POST',
      headers: {
        'Accept': 'application/json, text/javascript, */*; q=0.01',
        'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
      },
      body: 'deliveryId=' + videoId + '&isEmbed=true&responseType=json',
    })
      .then(respose => respose.json())
      .then(data => {
        const errorCode = data.ErrorCode;
        if (errorCode)
          throw new Error(data.ErrorMessage ?? '', { code: errorCode ?? -1 });

        const streamUrl = data.Delivery?.PodcastStreams[0]?.StreamUrl;
        const streams = (data.Delivery?.Streams || []).filter(x => x.StreamUrl != streamUrl);
        if (!streamUrl)
          throw new Error('Stream URL not ready yet');
        return [streamUrl, streams];
      })
      .catch(error => {
        log(error);
        throw error;
      });
  }

  function copyToClipboard(text) {
    if (typeof GM_setClipboard !== 'undefined') {
      GM_setClipboard(text, 'text');
      new Notify({
        text: 'Copied!',
        type: 'success'
      }).show();
    } else {
      navigator.clipboard.writeText(text).then(() => {
        new Notify({
          text: 'Copied!',
          type: 'success'
        }).show();
      }).catch(e => {
        log(e);
        const modal = showModal('<h3>There was an error when copying the download link</h3> <p>Copy it manually:</p><textarea type="text" value="" rows="3" onclick="this.select();"></textarea><p style="text-align:center;"><button onclick="this.parentElement.parentElement.remove();">Close</button></p>');
        modal.querySelector('textarea').value = text;
      });
    }
  }

  function showModal(html) {
    const div = document.createElement('div');
    div.innerHTML = html;
    if (document.querySelector('#Panopto-Video-DL')) {
      const hr = document.createElement('hr');
      div.prepend(hr);
      document.querySelector('#Panopto-Video-DL').append(div);
    } else {
      div.id = 'Panopto-Video-DL';
      document.querySelector('body').appendChild(div);
    }
    return div;
  }

  function addStyle(CSS) {
    if (typeof GM_addStyle != 'undefined') {
      GM_addStyle(CSS);
    } else {
      const style = document.createElement('style');
      style.innerText = CSS;
      document.head.appendChild(style);
    }
  }

  function log(message, level = 'log') {
    console[level]('%c Panopto-Video-DL ->', 'color:red;font-size:14px;', message);
  }

})();