const CopyVideos = (function () {

	const htmlQueryToCheckDownloads = '.link a'

	function getElements (strQueryElements) {
		return document.querySelectorAll(strQueryElements)
	}

	function interruptAndShowMessage (strMessage = 'Pressione <ENTER> para continuar.') {
		alert(strMessage)
		console.info(strMessage)
	}

	function emitError (strFunctionName) {
		const message = `Cant execute ${strFunctionName}`
		interruptAndShowMessage(message)
		console.error(message)
	}

	function interruptAndGenerateTextToCopy (strTextToCopy, strTipText = 'Copie o texto abaixo.') {
		prompt(strTipText, strTextToCopy)
		console.info(strTipText, strTextToCopy)
	}

	function isUrlFromAVideo (strUrl) {
		return strUrl.href.indexOf('video') > -1
	}

	function withEachElement (listOfNodesElements, fnCallback) {
		for (let i = 0, qt = listOfNodesElements.length; i < qt; i++) {
			let elementNode = listOfNodesElements[i]
			fnCallback(elementNode)
		}
	}

	function setup () {

		function getPageTitle () {
			const pageTitle = document.title
			if (pageTitle) {
				return pageTitle
			}
			emitError ('getPageTitle')
			return ''
		}

		function generateFolderTitle () {
			interruptAndGenerateTextToCopy(getPageTitle(), 'Nome da pasta. Pressione <ENTER> para continuar.')
			interruptAndShowMessage()
		}

		function init () {
			generateFolderTitle()
		}

		init()

	}

	function startAllDownloads () {

		const links = getElements(htmlQueryToCheckDownloads)
		let totalDownloadVideos = 0

		if (!links.length) {
			emitError ('startAllDownloads')
			return false
		}

		withEachElement(links, element => {
			if (isUrlFromAVideo(element)) {
				totalDownloadVideos++
				element.click()
			}
		})

		interruptAndShowMessage(`Foram gerados ${totalDownloadVideos} downloads nesta página. Pressione <ENTER> para continuar.`)

	}

	function init () {
		setup()
		startAllDownloads()
	}

	return {
		start: init
	}

})()


CopyVideos.start()