(()=>{
	let startedAt = null
	let scrolledTo = null
	window.addEventListener("load", ()=>{
		startedAt = new Date()
		scrolledTo = window.scrollY
		if (window.innerHeight > document.scrollingElement.scrollHeight) {
			scrolledTo = document.scrollingElement.scrollHeight
		}
	})
	window.addEventListener("scroll", (event)=>{
		scrolledTo = Math.max(scrolledTo, window.scrollY + window.innerHeight)
	}, false)
	window.addEventListener("beforeunload", ()=>{
		let xhr = new XMLHttpRequest()
		xhr.open("POST", "https://stats.ignore.pl/entry")
		xhr.setRequestHeader("Content-Type", "application/json")
		xhr.send(JSON.stringify({
			"location": document.location.href,
			"referrer": document.referrer,
			"startedAt": startedAt,
			"timeSpent": Math.floor((new Date() - startedAt) / 1000),
			"scrolledTo": scrolledTo / document.scrollingElement.scrollHeight
		}))
	})
})()