Play proper Evangelion endings on Netflix.

playProperEndingTheme.js

const mediaName = 'Neon Genesis Evangelion'; // Works for romanian/latin alphabet based languages only
var isEvangelion = false;
var epNumber;
var audio;
var video;
var audioLastPosition = 0;
var episodes = {
    "1": { 'endingThemeURL': 'https://instaud.io/_/3Rdt.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "2": { 'endingThemeURL': 'https://instaud.io/_/3Rdu.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "3": { 'endingThemeURL': 'https://instaud.io/_/3Rdv.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "4": { 'endingThemeURL': 'https://instaud.io/_/3Rdw.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "5": { 'endingThemeURL': 'https://instaud.io/_/3Rdx.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "6": { 'endingThemeURL': 'https://instaud.io/_/3Rdy.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "7": { 'endingThemeURL': 'https://instaud.io/_/3Rdz.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "8": { 'endingThemeURL': 'https://instaud.io/_/3RdA.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "9": { 'endingThemeURL': 'https://instaud.io/_/3RdB.mp3', 'secondsLeftToMuteVideo': 97.0, 'secondsLeftToStartTheme': 96.7 },
    "10": { 'endingThemeURL': 'https://instaud.io/_/3RdC.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "11": { 'endingThemeURL': 'https://instaud.io/_/3RdD.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "12": { 'endingThemeURL': 'https://instaud.io/_/3RdE.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "13": { 'endingThemeURL': 'https://instaud.io/_/3RdF.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "14": { 'endingThemeURL': 'https://instaud.io/_/3RdG.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "15": { 'endingThemeURL': 'https://instaud.io/_/3RdH.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "16": { 'endingThemeURL': 'https://instaud.io/_/3RdI.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "17": { 'endingThemeURL': 'https://instaud.io/_/3RdJ.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "18": { 'endingThemeURL': 'https://instaud.io/_/3RdK.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "19": { 'endingThemeURL': 'https://instaud.io/_/3RdL.mp3', 'secondsLeftToMuteVideo': 96.0, 'secondsLeftToStartTheme': 95.7 },
    "20": { 'endingThemeURL': 'https://instaud.io/_/3RdM.mp3', 'secondsLeftToMuteVideo': 98.0, 'secondsLeftToStartTheme': 97.7 },
    "21": { 'endingThemeURL': 'https://instaud.io/_/3RdN.mp3', 'secondsLeftToMuteVideo': 136.0, 'secondsLeftToStartTheme': 135.7 },
    "22": { 'endingThemeURL': 'https://instaud.io/_/3RdO.mp3', 'secondsLeftToMuteVideo': 127.0, 'secondsLeftToStartTheme': 126.7 },
    "23": { 'endingThemeURL': 'https://instaud.io/_/3RdP.mp3', 'secondsLeftToMuteVideo': 136.0, 'secondsLeftToStartTheme': 133.7 },
    "24": { 'endingThemeURL': 'https://instaud.io/_/3RdQ.mp3', 'secondsLeftToMuteVideo': 135.0, 'secondsLeftToStartTheme': 132.7 },
    "25": { 'endingThemeURL': 'https://instaud.io/_/3RdR.mp3', 'secondsLeftToMuteVideo': 97.0, 'secondsLeftToStartTheme': 96.5 },
    "26": { 'endingThemeURL': 'https://instaud.io/_/3RdS.mp3', 'secondsLeftToMuteVideo': 81.0, 'secondsLeftToStartTheme': 79.7 },
}

var resetAudioPlayback = function() {
    audio.currentTime = 0;
    audio.pause();
}

var resetAudioAndVideo = function() {
    audio.pause();
    audio = undefined;
    epNumber = undefined;
    isEvangelion = false;
}

var watchingEvangelion = function() {
    return document.querySelector('.ellipsize-text') && document.querySelector('.ellipsize-text').textContent.indexOf(mediaName) != -1;
}

var findEpNumber = function() {
    return parseInt(document.getElementsByClassName('ellipsize-text')[0].children[1].textContent.substring(4,6));
}

function once(fn, context) { 
    var result;
    return function() { 
        if (fn) {
            result = fn.apply(context || this, arguments);
            fn = null;
        }
        return result;
    };
}

var playProperEndingTheme = function() {
    isEvangelion = isEvangelion || watchingEvangelion();
    if (isEvangelion) {
        epNumber = epNumber || findEpNumber();
        video = document.querySelector("video");
        audio = audio || new Audio(episodes[String(epNumber)]['endingThemeURL']);

        if (audio && video) {
            secondsLeft = video.duration - video.currentTime;
            secondsLeftToMuteVideo = episodes[String(epNumber)]['secondsLeftToMuteVideo'];
            secondsLeftToStartTheme = episodes[String(epNumber)]['secondsLeftToStartTheme'];

            var insideEndingTimeFrame = secondsLeft <= secondsLeftToStartTheme && secondsLeft >= secondsLeftToStartTheme - audio.duration;
            var insideVideoMutingTimeFrame = secondsLeft <= secondsLeftToMuteVideo && secondsLeft >= secondsLeftToStartTheme - audio.duration;
            var videoSkipped = audioLastPosition == 0 || Math.abs(audioLastPosition - audio.currentTime) == 0;
        

            if (insideEndingTimeFrame && !video.paused) {
                video.addEventListener("play", function() {
                   audio.play();
                }, true);
        
                video.addEventListener("pause", function() {
                    audio.pause();
                }, true);
            
                audio.onended = function() {
                    video.muted = false;
                }

                if (videoSkipped) {
                    audio.currentTime = secondsLeftToStartTheme - secondsLeft;
                }
                audioLastPosition = audio.currentTime;
                audio.volume = video.volume;

                once(audio.play());
            } else {
                video.muted = false;

                if (insideEndingTimeFrame) {
                    audio.currentTime = secondsLeftToStartTheme - secondsLeft;
                    audio.volume = video.volume;
                    if (!video.paused) { audio.play(); }
                }

                if (insideVideoMutingTimeFrame) {
                    video.muted = true;
                }

                if (!insideEndingTimeFrame) {
                    resetAudioPlayback();
                } 
            }
        }
        

    	if (document.querySelector('.player-loading')) {
            resetAudioAndVideo();
    	}

    	if (document.location.href.indexOf('watch') == -1) {
    	    resetAudioAndVideo();
    	}

    } else {
        isEvangelion = watchingEvangelion();
    }
}

var t=setInterval(playProperEndingTheme,100);