// ==UserScript==
// @name         YouTube Default Audio Track
// @namespace    bp-yt-audio-track-default
// @version      1.0
// @description  Makes it possible to select the desired Audio Track.
// @author       BuIlDaLiBlE
// @match        https://www.youtube.com/*
// @icon         https://www.youtube.com/favicon.ico
// @grant        none
// @run-at       document-end
// @license      MIT
// @downloadURL none
// ==/UserScript==

// Configuration
const DESIRED_AUDIO_TRACK = "original"; // The desired audio track name (can be partial)

// Entry point
if(window.location.href.includes("youtube.com/shorts"))
{
    document.addEventListener("yt-player-updated", main);
}
else
{
    window.addEventListener("load", main);
}

function main()
{
    const player = getPlayer();
    updateSettings(player);
}

function updateSettings(player)
{
    try
    {
        const availableAudioTracks = player.getAvailableAudioTracks();
        const currentAudioTrack = player.getAudioTrack();

        if(availableAudioTracks === undefined || availableAudioTracks.length == 0)
        {
            return;
        }

        if(!currentAudioTrack.vc.name.toLowerCase().includes(DESIRED_AUDIO_TRACK.toLowerCase()))
        {
            for(const track of availableAudioTracks)
            {
                if(track.vc.name.toLowerCase().includes(DESIRED_AUDIO_TRACK.toLowerCase()))
                {
                    player.setAudioTrack(track);
                    break;
                }
            }
        }
    }
    catch(error)
    {
        console.error("An error occurred:", error.message);
    }
}

function getPlayer()
{
    let yt_player;
    if(window.location.href.includes("youtube.com/shorts"))
    {
        yt_player = document.getElementById("player").player_;
    }
    else
    {
        yt_player = document.getElementById("movie_player");
    }

    if(!yt_player)
    {
        throw new Error("YouTube Player not found!");
    }
    return yt_player;
}