/*
	========================================================================
	The 2022 /r/place Atlas

	An Atlas of Reddit's 2022 /r/place, with information to each
	artwork	of the canvas provided by the community.

	Copyright (c) 2017 Roland Rytz <roland@draemm.li>
	Copyright (c) 2022 r/placeAtlas2 contributors

	Licensed under the GNU Affero General Public License Version 3
	https://place-atlas.stefanocoding.me/license.txt
	========================================================================
*/

const variationsConfig = {
	default: {
		name: "r/place",
		code: "",
		default: 14,
		versions: [
			{
				timestamp: 1648822500,
				url: "./_img/place/1648822500.png"
			},
			{
				timestamp: 1648847036,
				url: "./_img/place/1648847036.png"
			},
			{
				timestamp: 1648870452,
				url: "./_img/place/1648870452.png"
			},
			{
				timestamp: 1648893666,
				url: "./_img/place/1648893666.png"
			},
			{
				timestamp: 1648917500,
				url: "./_img/place/1648917500.png"
			},
			{
				timestamp: 1648942113,
				url: "./_img/place/1648942113.png"
			},
			{
				timestamp: 1648956234,
				url: "./_img/place/1648956234.png"
			},
			{
				timestamp: 1648968061,
				url: "./_img/place/1648968061.png"
			},
			{
				timestamp: 1648979987,
				url: "./_img/place/1648979987.png"
			},
			{
				timestamp: 1648992274,
				url: "./_img/place/1648992274.png"
			},
			{
				timestamp: 1649012915,
				url: "./_img/place/1649012915.png"
			},
			{
				timestamp: 1649037182,
				url: "./_img/place/1649037182.png"
			},
			{
				timestamp: 1649060793,
				url: "./_img/place/1649060793.png"
			},
			{
				timestamp: 1649084741,
				url: "./_img/place/1649084741.png"
			},
			{
				timestamp: 1649113199,
				url: "./_img/place/final.png"
			}
		]
	}
}

const codeReference = {}
const imageCache = {}

const variantsEl = document.getElementById("variants")

for (const variation in variationsConfig) {
	codeReference[variationsConfig[variation].code] = variation
	const optionEl = document.createElement('option')
	optionEl.value = variation
	optionEl.textContent = variationsConfig[variation].name
	variantsEl.appendChild(optionEl)
}

const timelineSlider = document.getElementById("timeControlsSlider");
const tooltip = document.getElementById("timeControlsTooltip")
const image = document.getElementById("image");
let abortController = new AbortController()
let currentUpdateIndex = 0
let updateTimeout = setTimeout(null, 0)

let currentVariation = "default"
const defaultPeriod = variationsConfig[currentVariation].default
let currentPeriod = defaultPeriod
window.currentPeriod = currentPeriod
window.currentVariation = currentVariation

// SETUP
timelineSlider.max = variationsConfig[currentVariation].versions.length - 1;
timelineSlider.value = currentPeriod;

timelineSlider.addEventListener("input", (event) => {
    updateTooltip(parseInt(event.target.value), currentVariation)
    clearTimeout(updateTimeout)
    updateTimeout = setTimeout(() => {
        updateTime(parseInt(timelineSlider.value), currentVariation)
		setTimeout(() => {
			updateTime(parseInt(timelineSlider.value), currentVariation)
		}, 50)	
    }, 25)
})

variantsEl.addEventListener("input", (event) => {
	updateTime(currentPeriod, event.target.value)
})

// document.querySelector('#period-group .period-start').oninput = (event) => {
//     slider.value = parseInt(event.target.value)
//     updateTime(parseInt(event.target.value))
// };

// document.querySelector('#period-group .period-end').oninput = (event) => {
//     slider.value = parseInt(event.target.value)
//     updateTime(parseInt(event.target.value))
// };

const dispatchTimeUpdateEvent = (period = timelineSlider.value, atlas = atlas) => {
	const timeUpdateEvent = new CustomEvent('timeupdate', {
		detail: {
			period: period,
			atlas: atlas
		}
	});
	document.dispatchEvent(timeUpdateEvent);
}

async function updateBackground(newPeriod = currentPeriod, newVariation = currentVariation) {
	// console.log(newPeriod, newVariation)
	abortController.abort()
	abortController = new AbortController()
	currentUpdateIndex++
	const myUpdateIndex = currentUpdateIndex
	currentPeriod = newPeriod
	// console.log(newPeriod, newVariation)
	const variationConfig = variationsConfig[newVariation]
	if (currentVariation !== newVariation) {
		currentVariation = newVariation
		timelineSlider.max = variationConfig.versions.length - 1;
		currentPeriod = variationConfig.default;
		newPeriod = currentPeriod
	}
	timelineSlider.value = currentPeriod
	variantsEl.value = currentVariation
	const configObject = variationConfig.versions[currentPeriod];
	if (typeof configObject.url === "string") {
		if (imageCache[configObject.url] === undefined) {
			const fetchResult = await fetch(configObject.url, {
				signal: abortController.signal
			});
			if (currentUpdateIndex !== myUpdateIndex) {
				return [configObject, newPeriod, newVariation]
			}
			const imageBlob = await fetchResult.blob()
			imageCache[configObject.url] = URL.createObjectURL(imageBlob)
		}
		image.src = imageCache[configObject.url]
	} else {
		const canvas = document.createElement('canvas')
		const context = canvas.getContext('2d')
		context.canvas.width = 2000
		context.canvas.height = 2000
		for await (const url of configObject.url) {
			if (imageCache[url] === undefined) {
				const fetchResult = await fetch(url, {
					signal: abortController.signal
				});
				if (currentUpdateIndex !== myUpdateIndex) {
					return
				}
				const imageBlob = await fetchResult.blob()
				imageCache[url] = URL.createObjectURL(imageBlob)
			}
			const imageLayer = new Image()
			// console.log(imageCache[url])
			await new Promise(resolve => {
				imageLayer.onload = () => {
					context.drawImage(imageLayer, 0, 0)
					// console.log("image done")
					resolve()
				}
				imageLayer.src = imageCache[url]
			})

		}
		if (currentUpdateIndex !== myUpdateIndex) return [configObject, newPeriod, newVariation]
		const blob = await new Promise(resolve => canvas.toBlob(resolve))
		// console.log(URL.createObjectURL(blob))
		image.src = URL.createObjectURL(blob)
	}

	return [configObject, newPeriod, newVariation]
}

async function updateTime(newPeriod = currentPeriod, newVariation = currentVariation) {
	document.body.dataset.canvasLoading = true

	let configObject
	[configObject, newPeriod, newVariation] = await updateBackground(newPeriod, newVariation)

	atlas = []
	for (const atlasIndex in atlasAll) {
		let pathChosen, centerChosen, chosenIndex

		const validPeriods2 = Object.keys(atlasAll[atlasIndex].path)

		// console.log(chosenIndex)

		for (const i in validPeriods2) {
			const validPeriods = validPeriods2[i].split(', ')
			for (const j in validPeriods) {
				const [start, end, variation] = parsePeriod(validPeriods[j])
				// console.log(start, end, variation, newPeriod, newVariation)
				if (isOnPeriod(start, end, variation, newPeriod, newVariation)) {
					// console.log("match", start, end, variation, newPeriod, newVariation, i)
					chosenIndex = i
					break
				}
			}
			if (chosenIndex !== undefined) break
		}

		// console.log(testMatches)

		// console.log(chosenIndex)
		if (chosenIndex === undefined) continue
		pathChosen = Object.values(atlasAll[atlasIndex].path)[chosenIndex]
		centerChosen = Object.values(atlasAll[atlasIndex].center)[chosenIndex]

		if (pathChosen === undefined) continue

		// console.log(123)

		atlas.push({
			...atlasAll[atlasIndex],
			path: pathChosen,
			center: centerChosen,
		})
	}
	// console.log(atlas)

	dispatchTimeUpdateEvent(newPeriod, atlas)
	document.body.dataset.canvasLoading = false
}

function updateTooltip(newPeriod, newVariation) {
	const configObject = variationsConfig[newVariation].versions[newPeriod]
	if (typeof configObject.timestamp === "number") tooltip.querySelector('p').textContent = new Date(configObject.timestamp * 1000).toUTCString()
	else tooltip.querySelector('p').textContent = configObject.timestamp
	tooltip.style.left = Math.max(((timelineSlider.offsetWidth) * (timelineSlider.value >= 1 ? timelineSlider.value - 1 : 0) / (timelineSlider.max - 1)) - tooltip.offsetWidth / 2, 0) + "px"
}

tooltip.parentElement.addEventListener('mouseenter', () => updateTooltip(parseInt(timelineSlider.value), currentVariation))

window.addEventListener('resize', () => updateTooltip(parseInt(timelineSlider.value), currentVariation))

function isOnPeriod(start, end, variation, currentPeriod, currentVariation) {
	return currentPeriod >= start && currentPeriod <= end && variation === currentVariation
}

function parsePeriod(periodString) {
	// console.log(periodString)
	let variation = "default"
	periodString = periodString + ""
	if (periodString.split(':').length > 1) {
		const split = periodString.split(':')
		variation = codeReference[split[0]]
		periodString = split[1]
	}
	if (periodString.search('-') + 1) {
		const [start, end] = periodString.split('-').map(i => parseInt(i))
		return [start, end, variation]
	} else {
		const periodNew = parseInt(periodString)
		return [periodNew, periodNew, variation]
	}
}