var trainNumber
var date

var showKm = false

var trainData = null
var lastSuccessfulFetch = null

function onTrainData(data) {
	var title = document.getElementsByTagName('h1')[0]
	title.textContent = ''
	title.appendChild(document.createTextNode('Train '))
	var rankSpan = document.createElement('span')
	rankSpan.textContent = data.rank
	rankSpan.classList.add(data.rank)
	title.appendChild(rankSpan)
	title.appendChild(document.createTextNode(` ${data.number}`))

	document.getElementById('company').textContent = data.operator
	document.getElementById('date').textContent = data.date

	document.getElementById('route-from').textContent = data.route.from
	document.getElementById('route-to').textContent = data.route.to

	if (data.status) {
		document.getElementById('status').classList.remove('hidden')

		var statusDelay = document.getElementById('status-delay')
		while (statusDelay.childNodes.length > 0) {
			statusDelay.childNodes[0].remove()
		}
		var delayString = ''
		var delayMinutes = data.status.delay
		if (delayMinutes === 0) {
			delayString = 'On time'
			statusDelay.appendChild(document.createTextNode(delayString))
		}
		else {
			var early = false
			if (delayMinutes < 0) {
				early = true
				delayMinutes = -delayMinutes
			}
			
			if (delayMinutes >= 60) {
				var hours = Math.floor(delayMinutes / 60)
				delayMinutes = delayMinutes % 60
				delayString += hours.toString()
				delayString += ' hour'
				if (hours > 1) {
					delayString += 's'
				}
			}
			if (delayMinutes > 0) {
				if (delayString.length > 0) {
					delayString += ' and '
				}
				delayString += delayMinutes.toString()
				delayString += ' minute'
				if (delayMinutes > 1) {
					delayString += 's'
				}
			}
			delayString += ' '
			statusDelay.appendChild(document.createTextNode(delayString))

			var kindSpan = document.createElement('span')
			statusDelay.appendChild(kindSpan)
			if (early) {
				kindSpan.textContent = 'early'
				kindSpan.classList.add('early')
			}
			else {
				kindSpan.textContent = 'late'
				kindSpan.classList.add('late')
			}
		}

		var statusLocation = document.getElementById('status-location')
		while (statusLocation.childNodes.length > 0) {
			statusLocation.childNodes[0].remove()
		}
		var stateString = ''
		if (data.status.state === 'arrival') {
			stateString += 'when arriving at '
		}
		else if (data.status.state === 'departure') {
			stateString += 'when departing from '
		}
		else if (data.status.state === 'passing') {
			stateString += 'while passing through '
		}
		statusLocation.appendChild(document.createTextNode(stateString))
		var stationSpan = document.createElement('span')
		statusLocation.appendChild(stationSpan)
		stationSpan.textContent = data.status.station
		stationSpan.classList.add('station')
	}
	else {
		document.getElementById('status').classList.add('hidden')
	}

	var stationsDiv = document.getElementById('stations')
	while (stationsDiv.childNodes.length > 0) {
		stationsDiv.childNodes[0].remove()
	}

	var separator = document.createElement('h4')
	stationsDiv.appendChild(separator)
	separator.textContent = 'Stations'

	var stationsList = document.createElement('ul')
	stationsDiv.appendChild(stationsList)

	data.stations.forEach(function (station) {
		var stationItem = document.createElement('li')
		stationsList.appendChild(stationItem)
		stationItem.classList.add('stationItem')

		var stationName = document.createElement('p')
		stationItem.appendChild(stationName)
		stationName.textContent = station.name
		stationName.classList.add('pri', 'name')

		if (station.arrival) {
			var stationArrival = document.createElement('div')
			stationItem.appendChild(stationArrival)
			stationArrival.classList.add('arrival')

			var originalArr = document.createElement('p')
			stationArrival.appendChild(originalArr)
			var arrDate = new Date(station.arrival.scheduleTime)
			originalArr.textContent = arrDate.toLocaleTimeString([], { 'hour': '2-digit', 'minute': '2-digit' })
			originalArr.classList.add('pri')
			if (station.arrival.status && station.arrival.status.delay != 0) {
				originalArr.classList.remove('pri')
				originalArr.classList.add('thi', 'original')

				var actualArr = document.createElement('p')
				stationArrival.appendChild(actualArr)
				arrDate.setMinutes(arrDate.getMinutes() + station.arrival.status.delay)
                actualArr.textContent = arrDate.toLocaleTimeString([], { 'hour': '2-digit', 'minute': '2-digit' })
				actualArr.classList.add('pri', station.arrival.status.delay > 0 ? 'late' : 'early')
				if (!station.arrival.status.real) {
					actualArr.classList.add('not-real')
				}
			}
		}

		if (station.departure) {
			var stationDeparture = document.createElement('div')
			stationItem.appendChild(stationDeparture)
			stationDeparture.classList.add('departure')

			var originalDep = document.createElement('p')
			stationDeparture.appendChild(originalDep)
			var depDate = new Date(station.departure.scheduleTime)
			originalDep.textContent = depDate.toLocaleTimeString([], { 'hour': '2-digit', 'minute': '2-digit' })
			originalDep.classList.add('pri')
			if (station.departure.status && station.departure.status.delay != 0) {
				originalDep.classList.remove('pri')
				originalDep.classList.add('thi', 'original')

				var actualDep = document.createElement('p')
				stationDeparture.appendChild(actualDep)
				depDate.setMinutes(depDate.getMinutes() + station.departure.status.delay)
                actualDep.textContent = depDate.toLocaleTimeString([], { 'hour': '2-digit', 'minute': '2-digit' })
				actualDep.classList.add('pri', station.departure.status.delay > 0 ? 'late' : 'early')
				if (!station.departure.status.real) {
					actualDep.classList.add('not-real')
				}
			}
		}

		var stationKm = document.createElement('p')
		stationItem.appendChild(stationKm)
		stationKm.textContent = `${station.km} km`
		stationKm.classList.add('thi', 'km')
		if (!showKm) {
			stationKm.classList.add('hidden')
		}

		if (station.platform) {
			var stationPlatform = document.createElement('p')
			stationItem.appendChild(stationPlatform)
			stationPlatform.textContent = `platform ${station.platform}`
			stationPlatform.classList.add('thi', 'platform')
		}
	})

	lastSuccessfulFetch = new Date()
}

var refreshStopToken = null
function refresh() {
	return fetch(`https://scraper.infotren.dcdev.ro/v2/train/${trainNumber}?date=${date.getFullYear().toString()}-${(date.getMonth() + 1).toString().padStart(2, "0")}-${date.getDate().toString().padStart(2, "0")}`)
		.then(function (response) {
			return response.json()
		})
		.then(function (response) {
			trainData = response
			onTrainData(response)
		})
		.then(function () {
			if (refreshStopToken != null) {
				clearTimeout(refreshStopToken)
			}
			refreshStopToken = setTimeout(function () { 
				refresh()
			}, 60000)
		})
}

window.addEventListener('unload', function (e) {
	if (refreshStopToken != null) {
		clearTimeout(refreshStopToken)
	}
})

function rsk() {
	refresh()
}

window.addEventListener('load', function (e) {
	if (!new URL(window.location.href).searchParams.has('train')) {
		window.history.back()
		this.setTimeout(function () {
			var url = new URL(window.location.href)
			url.pathname = 'train.html'
			window.location.href = url.toString()
		}, 100)
	}

	var sp = new URL(window.location.href).searchParams

	trainNumber = sp.get('train')
	date = sp.has('date') ? new Date(sp.get('date')) : new Date()

	document.querySelectorAll('.rsk').forEach(function (rskElem) {
		rskElem.addEventListener('click', function (e) {
			rsk()
		})
	})

	var content = document.getElementsByClassName('content')[0]
	content.focus()
	content.addEventListener('keydown', function (e) {
		switch (e.key) {
			case 'ArrowUp':
				content.scrollBy(0, -50)
				break
			case 'ArrowDown':
				content.scrollBy(0, 50)
				break
			case 'SoftRight':
				rsk()
				break
			case '1':
				date.setDate(date.getDate() - 1)
				refresh()
				break
			case '3':
				date.setDate(date.getDate() + 1)
				refresh()
				break
			case '7':
				showKm = !showKm
				document.querySelectorAll('.km').forEach(function (kmItem) {
					if (showKm) {
						kmItem.classList.remove('hidden')
					}
					else {
						kmItem.classList.add('hidden')
					}
				})
				break
			default:
				console.log(e.key)
		}
	})

	refresh()

	setInterval(function () {
		if (!lastSuccessfulFetch) {
			return
		}
		var millis = new Date() - lastSuccessfulFetch
		var secs = Math.floor(millis / 1000)
		
		var timeStr = ''
		if (secs / 3600 >= 1) {
			timeStr += `${Math.floor(secs / 3600)}h`
			secs = secs % 3600
		}
		if (secs / 60 >= 1) {
			timeStr += `${Math.floor(secs / 60)}m`
			secs = secs % 60
		}
		if (secs >= 1) {
			timeStr += `${Math.floor(secs)}s`
		}
		if (!timeStr) {
			return
		}

		document.querySelectorAll('.lsk').forEach(function (elem) {
			elem.textContent = `Last refreshed ${timeStr} ago`
			elem.classList.add('last-refreshed')
		})
	}, 500)
})