// ==UserScript==
// @name         芯位教育自动刷课
// @namespace    https://gitee.com/CreativeNew/
// @version      1.0.0
// @description  芯位教育网课自动跳转到下一节课
// @author       XuTao.
// @match        https://teaching.51xinwei.com/*
// @icon         https://teaching.51xinwei.com/*
// @grant        none
// @run-at document-end
// @license AGPL-3.0 license
// @downloadURL none
// ==/UserScript==


(function() {
	'use strict';

})();


const body = document.querySelector('body');


let obServer = new MutationObserver(handler);

const options = {
	childList: true
}


obServer.observe(body, options)



function handler(mutationRecordList) {
	for (let i = 0; i < mutationRecordList.length; i++) {
		let addedNodes = mutationRecordList[i].addedNodes
		for (let i = 0; i < addedNodes.length; i++) {
			if (addedNodes[i].innerText.indexOf('学习下一课节') > 0) {
				//单击下一节课按钮
				obsClick('.layui-layer.layui-layer-dialog .layui-layer-btn0');
				break;
			}
		}
	}

	//检测是否为预览文档页
	obsText('#page_learn_courseware_document .transcode-file-area.text-center', '该文档类型不支持预览，请点击 这里 下载文档')
		.then((res) => {
			let courseChapterItem = document.querySelectorAll('.course_chapter_item.user-no-select.ng-scope')
			let activeItem = document.querySelector('.course_chapter_item.user-no-select.ng-scope.active')

			let activeItemText = activeItem.innerText
			for (let i = 0; i < courseChapterItem.length; i++) {
				if (activeItemText == courseChapterItem[i].innerText) {
					courseChapterItem[i + 1].children[1].click()
					break;
				}
			}
		})
}

let obsClickTimer = null
/**
 * 监测到节点后点击
 * @param selector    CSS选择器
 * @returns {Promise<unknown>}
 */
function obsClick(selector) {
	return new Promise((resolve, reject) => {
		let startExecutionTime = new Date().getTime()
		if (obsClickTimer) {
			clearInterval(obsClickTimer)
		}
		obsClickTimer = setInterval(() => {
			let target = document.querySelector(selector)
			if (target) {
				clearInterval(obsClickTimer)
				target.click()
				resolve({
					element: selector,
					operation: 'click'
				})
			} else {
				return
			}

			let executionTime = new Date().getTime()
			if (startExecutionTime - executionTime > 1000 * 10) {
				clearInterval(obsClickTimer)
				reject('超时')
			}
		}, 500)
	})
}


let obsTextTimer = null
/**
 * 监测节点内容
 * @param selector    CSS选择器
 * @param text        节点内容
 * @returns {Promise<unknown>}
 */
function obsText(selector, text) {
	return new Promise((resolve, reject) => {
		let startExecutionTime = new Date().getTime()
		if (obsTextTimer) {
			clearInterval(obsTextTimer)
		}
		obsTextTimer = setInterval(() => {
			let target = document.querySelector(selector)
			if (target && target.textContent.trim() == text) {
				clearInterval(obsTextTimer)
				resolve(selector)
			} else {
				return
			}

			let executionTime = new Date().getTime()
			if (startExecutionTime - executionTime > 1000 * 10) {
				clearInterval(obsTextTimer)
				reject('超时')
			}
		}, 500)
	})
}