Eat Your Food - Netflix Interruptor

userscript.js

// ==UserScript==
// @name         Remember to eat your food while watching Netflix
// @namespace    https://www.tarikguney.com
// @version      0.1
// @description  Kids watching cartoons on Netflix often forget to eat and chew their food, which drives parents crazy. You need to sit down with them and pause the video and remind them to eat their food. This script will automate that.
// @author       Tarik Guney
// @match        https://www.netflix.com/watch/*
// @icon         https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Netflix_icon.svg/1200px-Netflix_icon.svg.png
// @grant        none
// ==/UserScript==

/* 
Known problems:
1. When Netflix video jumps to the next in line, the script loses its effect. Looks like the jump happens w/o page refresh.
*/

(function() {
    'use strict';
    // Waits for this many seconds to try to find Netflix media player. Waiting for document ready is not enough.
    // A better solution would check if the media player is ready in a loop rather than a fixed delay, but this is simpler for now.
    var initializationDelay = 10000; // 10 seconds
    
    var interruptionInterval = 40000; // 40 seconds
    var pauseTime = 8000; // 8 seconds
    
    if(document.readyState === 'ready' || document.readyState === 'complete') {
        console.info("page is ready");
        startInterruptingNetflix();
    } else {
        document.onreadystatechange = function () {
            if (document.readyState == "complete") {
                console.info("page is ready");
                startInterruptingNetflix();
            }
        }
    }
})();

function startInterruptingNetflix(){
    setTimeout(function(){
        var mediaPlayer = document.getElementsByTagName("video")[0];
        var mediaPlayerFound = mediaPlayer != null;
        
        if(mediaPlayerFound){
            console.info("the netflix media player is found");
            setInterval(function(){
                mediaPlayer.pause();
                console.info("the media player is paused");
                setTimeout(function(){
                    mediaPlayer.play();
                    console.info("the media player resumes");
                },pauseTime);
            },interruptionInterval);
        } else {
            console.error("the netflix media player could not be found. increase the intializationDelay perhaps.");
        }
    },initializationDelay);
}