// ==UserScript==
// @name         ManyVids - Stream Only video downloader
// @homepage     https://www.empornium.me/forums.php?action=viewthread&threadid=98925
// @icon         https://www.manyvids.com/favicon.png
// @version      1.5
// @description  ManyVids' devs could easily patch this! So please be careful where you share this! Adds a download button to stream only videos. It downloads the original video file as if downloading was enabled.
// @author       You-should-own-what-you-purchase
// @match        https://www.manyvids.com/Video/*
// @grant        none
// @license      MIT
// ==/UserScript==
(function () {
   'use strict'

   async function error(parameter) {
       let error_message = `ManyVids - Stream Only video downloader
Error getting the ${parameter}.
If you want this to get fixed,
please tell the developer the video link,
browser and userscript manager you use.`
       await alert(error_message)
       console.error(error_message)
   }

   // If there is no 'Stream Only' string in the video details, that means the video is not stream only.
   var video_details = document.querySelector('[class="mb-1"]').innerText
   var video_details_regex = /Stream Only$/
   if (!video_details_regex.test(video_details)) {
       return
   }

   // If there is a 'Login' button that means you are not logged in.
   var login_button = document.getElementById('mvts-nav-login-btn')
   if (login_button) {
       return
   }

   // If there is a 'Add to Cart' button that means the video is not purchased and can't be downloaded.
   var add_to_cart_button = document.getElementsByClassName('btn btn-primary add-cart cart-trigger js-video-cart-btn')[0]
   if (add_to_cart_button) {
       return
   }

   // Tries to find the id parameter. The source is from the video URL pathname.
   var id_parameter_source = window.location.pathname
   var id_parameter_regex = /\/Video\/([0-9]+)\//
   var id_parameter = id_parameter_source.match(id_parameter_regex)
   if (id_parameter === null) {
       error('id parameter')
       return
   } else {
       id_parameter = id_parameter[1]
   }

   // Tries to find the c or etag parameter. The source is from the webpage source code.
   var c_or_etag_parameter_source = document.getElementById('pageMetaDetails').getAttribute('data-meta-image')
   var c_parameter_regex = /cloudfront\.net\/php_uploads\/video_images\/.+?\/thumbs\/thumb_([0-9a-zA-Z]+)_screenshot_/
   var etag_parameter_regex = /cloudfront\.net\/[0-9]+\/([0-9a-z]+)\/screenshots\//
   var c_parameter = ''
   var etag_parameter = c_or_etag_parameter_source.match(etag_parameter_regex)
   if (etag_parameter === null) {
       etag_parameter = ''
       c_parameter = c_or_etag_parameter_source.match(c_parameter_regex)
       if (c_parameter === null) {
           error('c or etag parameters')
           return
       } else {
           c_parameter = c_parameter[1]
       }
   } else {
       etag_parameter = etag_parameter[1]
   }

   // Adds the download button to its usual place.
   var download_button = `<a class="js-download-btn btn btn-primary btn-sm"
   href="/download.php?id=${id_parameter}&c=${c_parameter}&etag=${etag_parameter}"
   target="_blank">Download</a>`
   document.querySelector('.buy-wrapper.video-buy-wrapper > .text-right.mt-2').insertAdjacentHTML('beforeEnd', download_button)
})()