// ==UserScript==
// @name         m.YouTube.com quality change buttons
// @namespace    m-youtube-com-quality-change-buttons
// @version      1.6
// @description  Adds quality change buttons below the video (144p, 240p, 360p, 480p, 720p, 1080p...)
// @author       hlorand.hu
// @match        https://m.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        none
// @license      https://creativecommons.org/licenses/by-nc-sa/4.0/
// @downloadURL none
// ==/UserScript==

// Screenshot: https://ibb.co/pyXQd4C

(function() {
    //'use strict';

    function addbuttons(){
        document.getElementById("qualitybuttons").innerHTML = "";

        var player = document.getElementById('movie_player');

        // it is neccesary to start the video, to getAvailableQualityData
        player.click(); // start video
        player.click(); // pause video

        const qualities = player.getAvailableQualityData();

        qualities.forEach((q)=>{

            let button = document.createElement('button');
            button.setAttribute("quality", q.quality);
            button.textContent = q.qualityLabel.replace("p50","p").replace("p60","p"); // remove fps from label
            button.className = "qualitybutton";

            button.style.margin = "5px";
            button.style.padding = "5px";
            button.style.position = "relative";

            // get current quality
            if( player.getPlaybackQualityLabel() == q.qualityLabel ){
                button.style.backgroundColor = "darkorange";
            } else{
                button.style.backgroundColor = "green";
            }

            button.onclick = function() {
                player.setPlaybackQualityRange( this.getAttribute("quality") );

                // highlight the clicked button and desaturate the others
                document.querySelectorAll(".qualitybutton").forEach((btn)=>{
                    btn.style.backgroundColor = "green";
                });
                this.style.backgroundColor = "darkorange";
            };

            let div = document.querySelector('.related-chips-slot-wrapper');
            div.insertBefore(button, div.firstChild);

        }); // end qualities foreach

    } // end addbuttons

    // Periodically check if the buttons are visible (sometimes YouTube redraws its interface).
    setInterval(()=>{
        // Creating a div that will contain buttons.
        if( document.getElementById("qualitybuttons") == undefined ){
            let parent = document.querySelector('.related-chips-slot-wrapper'); // placement of buttons
            let wrapper = document.createElement('div');
            wrapper.setAttribute("id","qualitybuttons");
            parent.insertBefore(wrapper, parent.firstChild);
            addbuttons();
        }
    }, 1000);

})();