var stationId
var date

var stationData = {
	departures: [],
	arrivals: [],
}
var lastSuccessfulFetch = null

/**
 * @typedef StationArrDep
 * @property {string} tripId
 * @property {DbStop} stop
 * @property {string | null} when
 * @property {string} plannedWhen
 * @property {number | null} delay
 * @property {string | null} platform
 * @property {string | null} plannedPlatform
 * @property {string | null} prognosisType
 * @property {string | null} direction
 * @property {string | null} provenance
 * @property {DbLine} line
 * @property {DbRemark[]} remarks
 * @property {DbStop | null} origin
 * @property {DbStop | null} destionation
 */

/**
 * @typedef StationData
 * @prop {StationArrDep[]} departures
 * @prop {StationArrDep[]} arrivals
 */
	
/**
 * @param {?StationData} data
 */
function onStationData(data) {
	if (!data || !data.arrivals && !data?.departures) {
		return
	}

	var title = document.getElementById('title')
	title.textContent = (data.departures[0] || data.arrivals[0]).stop.name

	// document.getElementById('date').textContent = data.date

	document.getElementById('loading').classList.add('hidden')

	/**
	 * @param {HTMLElement} elem
	 * @param {StationArrDep[]} trains
	 */
	function addTrains(elem, trains) {
		while (elem.childNodes.length > 0) {
			elem.childNodes[0].remove()
		}

		var trainsList = document.createElement('ul')
		elem.appendChild(trainsList)

		trains.forEach(function (train, tIdx) {
			var trainItem = document.createElement('li')
			trainsList.appendChild(trainItem)
			trainItem.classList.add('train-item')
			// if (train.status && train.status.cancelled) {
			// 	trainItem.classList.add('cancelled')
			// }

			var timeDiv = document.createElement('p')
			trainItem.appendChild(timeDiv)
			timeDiv.classList.add('pri', 'time')
			var timeDivPre = document.createElement('pre')
			timeDiv.appendChild(timeDivPre)
			timeDivPre.textContent = new Date(train.plannedWhen).toLocaleTimeString([], { 'hour': '2-digit', 'minute': '2-digit' })

			if (train.delay && train.delay != 0) {
				var delayDiv = document.createElement('p')
				trainItem.appendChild(delayDiv)
				delayDiv.classList.add('thi', 'delay')
				delayDiv.textContent = `${train.delay / 60} min `
				// delayDiv.appendChild(document.createElement('br'))
				var descSpan = document.createElement('span')
				delayDiv.appendChild(descSpan)
				if (train.delay > 0) {
					descSpan.classList.add('late')
					descSpan.textContent = 'late'
				}
				else {
					descSpan.classList.add('early')
					descSpan.textContent = 'early'
				}
			}

			// var rankDiv = document.createElement('p')
			// trainItem.appendChild(rankDiv)
			// rankDiv.classList.add('sec', 'rank', train.train.rank)
			// var rankDivPre = document.createElement('pre')
			// rankDiv.appendChild(rankDivPre)
			// rankDivPre.textContent = train.train.rank

			var trainDiv = document.createElement('p')
			trainItem.appendChild(trainDiv)
			trainDiv.classList.add('pri', 'train')
			var trainDivHref = document.createElement('a')
			trainDiv.appendChild(trainDivHref)
			trainDivHref.classList.add('no-a-custom')
			var trainUrl = new URL('/view-train.html', window.location.origin)
			trainUrl.searchParams.append('tripId', train.tripId)
			trainDivHref.href = trainUrl.toString()
			var trainDivHrefPre = document.createElement('pre')
			trainDivHref.appendChild(trainDivHrefPre)
			trainDivHrefPre.textContent = train.line.name

			var terminusDiv = document.createElement('p')
			trainItem.appendChild(terminusDiv)
			terminusDiv.classList.add('pri', 'terminus')
			terminusDiv.textContent = train.direction

			if (train.platform) {
				var platformDiv = document.createElement('div')
				trainItem.appendChild(platformDiv)
				platformDiv.classList.add('thi', 'platform')
				if (train.platform && train.platform !== train.plannedPlatform) {
					platformDiv.classList.add('changed')
				}
				var platformDivPre = document.createElement('pre')
				platformDiv.appendChild(platformDivPre)
				platformDivPre.textContent = train.platform || train.plannedPlatform
			}

			if (train.cancelled) {
				trainItem.classList.add('cancelled')
				var statusDiv = document.createElement('p')
				trainItem.appendChild(statusDiv)
				statusDiv.classList.add('sec', 'status', 'status-cancel')
				statusDiv.textContent = 'This journey is cancelled'
			}
		})
	}
	addTrains(document.getElementById('arrivals'), data.arrivals)
	addTrains(document.getElementById('departures'), data.departures)
}

var refreshStopToken = null
function refresh() {
	function reschedule(timeout) {
		if (refreshStopToken != null) {
			clearTimeout(refreshStopToken)
		}
		refreshStopToken = setTimeout(function () {
			refresh()
		}, timeout || 90000)
	}
	var reqDate = new Date(date.valueOf())
	// reqDate.setHours(0, 0, 0, 0)
	reqDate.setMinutes(reqDate.getMinutes() - 15)
	return Promise.all([
		fetch(
			`https://v6.db.transport.rest/stops/${stationId}/arrivals?when=${reqDate.toISOString()}&duration=1440`,
			{
				cache: 'no-store',
			},
		),
		fetch(
			`https://v6.db.transport.rest/stops/${stationId}/departures?when=${reqDate.toISOString()}&duration=1440`,
			{
				cache: 'no-store',
			},
		),
	]).then(function (responses) {
		if (!responses[0].ok || !responses[1].ok) {
			// Check in 10 seconds if server returned error
			reschedule(10000)
			return
		}
		var cacheDate = responses[0].headers.get('SW-Cached-At')
		return Promise.all(responses.map(function (r) {return r.json() })).then(function (data) {
			data['$cacheDate'] = cacheDate
			return data
		})
	}).then(function (responses) {
		if (!responses) {
			return
		}
		var cacheDate = responses['$cacheDate']
		if (cacheDate) {
			cacheDate = new Date(cacheDate)
		}
		var success = !cacheDate
		stationData.arrivals = responses[0].arrivals
		stationData.departures = responses[1].departures
		onStationData(stationData)
		// Check in 1 seconds if network error
		reschedule(success ? undefined : 1000)
		return success
	}).catch(function (e) {
		// Check in 1 second if network error
		reschedule(1000)
		throw e
	})
}

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

function rsk() {
	function changeRskText(newText) {
		document.querySelectorAll('.rsk').forEach(function (elem) {
			elem.textContent = newText
		})
	}

	changeRskText('Refreshing...')
	refresh().catch(function () { return false}).then(function (success) {
		if (!success) {
			changeRskText('Refreshing failed')
			setTimeout(function (_) {
				changeRskText('Refresh')
			}, 3000)
		}
		else {
			changeRskText('Refresh')
		}
	})
}

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

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

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

	// View departures first
	selectedTab = 1
	selectTab(selectedTab)

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

	if (navigator.canShare && navigator.canShare({ url: '' })) {
		document.getElementById('title').addEventListener('click', function () {
			navigator.share({ url: '' });
		})
	}

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