// ==UserScript==
// @name        Study.com Quiz Answers
// @namespace   Violentmonkey Scripts
// @match       *://*.study.com/*
// @include     https://study.com/*
// @grant       none
// @version     1.1.0
// @author      Jonah Lawrence
// @description Highlights correct answers with a green background on Study.com quizzes and exams
// @downloadURL none
// ==/UserScript==

/* jshint esversion: 6 */

(function () {
	const interval = setInterval(function () {
		const container = document.querySelector("#practice-exam-container");
		// check if practice-exam-container element exists (only on exam pages)
		if (container) {
			const controller = angular.element(container).controller();
			if (controller) {
				// get questions
				const questions = controller.questionByQuestionInstanceId;
				// highlight the answer to each question
				Object.values(questions).forEach(function (x) {
					const correctAnswer = document.querySelector(`li[ng-class*="${x.correctQuizQuestionOptionId}"]`);
					if (correctAnswer) {
						correctAnswer.style.background = "#c5ff81";
						correctAnswer.style.borderRadius = "2px";
						correctAnswer.style.boxShadow = "0 0 0 6px #c5ff81";
						// no need to keep checking
						clearInterval(interval);
					}
				});
			}
		}
		else {
			// add styling for showing quiz answers
			const style = document.createElement('style');
			style.innerText = `
							label[data-correct="true"] {
									background: #c5ff81;
									box-shadow: 0 0 0 14px #c5ff81;
							}`;
			document.head.appendChild(style);
			// disable interval since this is not an exam
			clearInterval(interval);
		}
	}, 500);
})();