window.browser = window.browser || window.chrome

import localise from "./localise.js"
import servicesHelper from "./services.js"

function getRandomInstance(instances) {
	return instances[~~(instances.length * Math.random())]
}

function camelCase(str) {
	return str.charAt(0).toUpperCase() + str.slice(1)
}

let cloudflareBlackList = []
let authenticateBlackList = []
let offlineBlackList = []
async function initBlackList() {
	return new Promise(resolve => {
		fetch("/instances/blacklist.json")
			.then(response => response.text())
			.then(data => {
				cloudflareBlackList = JSON.parse(data).cloudflare
				authenticateBlackList = JSON.parse(data).authenticate
				offlineBlackList = JSON.parse(data).offline
				resolve()
			})
	})
}

function updateInstances() {
	return new Promise(async resolve => {
		let http = new XMLHttpRequest()
		let fallback = new XMLHttpRequest()
		http.open("GET", "https://codeberg.org/LibRedirect/libredirect/raw/branch/master/src/instances/data.json", false)
		http.send(null)
		if (http.status != 200) {
			fallback.open("GET", "https://raw.githubusercontent.com/libredirect/libredirect/master/src/instances/data.json", false)
			fallback.send(null)
			if (fallback.status === 200) {
				http = fallback
			} else {
				resolve()
				return
			}
		}
		await initBlackList()
		const instances = JSON.parse(http.responseText)

		await servicesHelper.setRedirects(instances)

		console.info("Successfully updated Instances")
		resolve(true)
		return
	})
}

function protocolHost(url) {
	if (url.username && url.password) return `${url.protocol}//${url.username}:${url.password}@${url.host}`
	return `${url.protocol}//${url.host}`
}

async function processDefaultCustomInstances(service, frontend, network, document) {
	let instancesLatency
	let frontendNetworkElement = document.getElementById(frontend).getElementsByClassName(network)[0]

	let frontendCustomInstances = []
	let frontendCheckListElement = frontendNetworkElement.getElementsByClassName("checklist")[0]

	await initBlackList()

	let frontendDefaultRedirects

	let redirects, options

	async function getFromStorage() {
		return new Promise(async resolve =>
			browser.storage.local.get(["options", "redirects", "latency"], r => {
				frontendDefaultRedirects = r.options[frontend][network].enabled
				frontendCustomInstances = r.options[frontend][network].custom
				options = r.options
				instancesLatency = r.latency[frontend] ?? []
				redirects = r.redirects
				resolve()
			})
		)
	}

	await getFromStorage()

	function calcFrontendCheckBoxes() {
		let isTrue = true
		for (const item of redirects[frontend][network]) {
			if (!frontendDefaultRedirects.includes(item)) {
				isTrue = false
				break
			}
		}
		for (const element of frontendCheckListElement.getElementsByTagName("input")) {
			element.checked = frontendDefaultRedirects.includes(element.className)
		}
		if (frontendDefaultRedirects.length == 0) isTrue = false
		frontendNetworkElement.getElementsByClassName("toggle-all")[0].checked = isTrue
	}
	frontendCheckListElement.innerHTML = [
		`<div>
        <x data-localise="__MSG_toggleAll__">Toggle All</x>
        <input type="checkbox" class="toggle-all"/>
      </div>`,
		...redirects[frontend][network].map(x => {
			const cloudflare = cloudflareBlackList.includes(x) ? ' <span style="color:red;">cloudflare</span>' : ""
			const authenticate = authenticateBlackList.includes(x) ? ' <span style="color:orange;">authenticate</span>' : ""
			const offline = offlineBlackList.includes(x) ? ' <span style="color:grey;">offline</span>' : ""

			let ms = instancesLatency[x]
			let latencyColor = ms == -1 ? "red" : ms <= 1000 ? "green" : ms <= 2000 ? "orange" : "red"
			let latencyLimit
			if (ms == 5000) latencyLimit = "5000ms+"
			else if (ms > 5000) latencyLimit = `ERROR: ${ms - 5000}`
			else if (ms == -1) latencyLimit = "Server not found"
			else latencyLimit = ms + "ms"

			const latency = x in instancesLatency ? '<span style="color:' + latencyColor + ';">' + latencyLimit + "</span>" : ""

			let warnings = [cloudflare, authenticate, offline, latency].join(" ")
			return `<div>
                    <x><a href="${x}" target="_blank">${x}</a>${warnings}</x>
                    <input type="checkbox" class="${x}"/>
                  </div>`
		}),
	].join("\n<hr>\n")

	localise.localisePage()

	calcFrontendCheckBoxes()
	frontendNetworkElement.getElementsByClassName("toggle-all")[0].addEventListener("change", async event => {
		browser.storage.local.get("options", r => {
			let options = r.options
			if (event.target.checked) frontendDefaultRedirects = [...redirects[frontend][network]]
			else frontendDefaultRedirects = []

			options[frontend][network].enabled = frontendDefaultRedirects
			browser.storage.local.set({ options })
			calcFrontendCheckBoxes()
		})
	})

	for (let element of frontendCheckListElement.getElementsByTagName("input")) {
		if (element.className != "toggle-all")
			frontendNetworkElement.getElementsByClassName(element.className)[0].addEventListener("change", async event => {
				browser.storage.local.get("options", r => {
					let options = r.options
					if (event.target.checked) frontendDefaultRedirects.push(element.className)
					else {
						let index = frontendDefaultRedirects.indexOf(element.className)
						if (index > -1) frontendDefaultRedirects.splice(index, 1)
					}

					options[frontend][network].enabled = frontendDefaultRedirects
					browser.storage.local.set({ options })
					calcFrontendCheckBoxes()
				})
			})
	}

	function calcFrontendCustomInstances() {
		frontendNetworkElement.getElementsByClassName("custom-checklist")[0].innerHTML = frontendCustomInstances
			.map(
				x => `<div>
                ${x}
                <button class="add clear-${x}">
                  <svg xmlns="http://www.w3.org/2000/svg" height="20px" viewBox="0 0 24 24" width="20px" fill="currentColor">
                    <path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41z" />
                  </svg>
                </button>
              </div>
              <hr>`
			)
			.join("\n")

		for (const item of frontendCustomInstances) {
			frontendNetworkElement.getElementsByClassName(`clear-${item}`)[0].addEventListener("click", async () => {
				browser.storage.local.get("options", r => {
					let options = r.options
					let index = frontendCustomInstances.indexOf(item)
					if (index > -1) frontendCustomInstances.splice(index, 1)
					options[frontend][network].custom = frontendCustomInstances
					browser.storage.local.set({ options })
					calcFrontendCustomInstances()
				})
			})
		}
	}
	calcFrontendCustomInstances()
	frontendNetworkElement.getElementsByClassName("custom-instance-form")[0].addEventListener("submit", async event => {
		browser.storage.local.get("options", r => {
			let options = r.options
			event.preventDefault()
			let frontendCustomInstanceInput = frontendNetworkElement.getElementsByClassName("custom-instance")[0]
			let url = new URL(frontendCustomInstanceInput.value)
			let protocolHostVar = protocolHost(url)
			if (frontendCustomInstanceInput.validity.valid && !redirects[frontend][network].includes(protocolHostVar)) {
				if (!frontendCustomInstances.includes(protocolHostVar)) {
					frontendCustomInstances.push(protocolHostVar)
					options[frontend][network].custom = frontendCustomInstances
					browser.storage.local.set({ options })
					frontendCustomInstanceInput.value = ""
				}
				calcFrontendCustomInstances()
			}
		})
	})
}

function ping(href) {
	return new Promise(async resolve => {
		let average = 0
		let time
		for (let i = 0; i < 3; i++) {
			time = await pingOnce(href)
			if (i == 0) continue
			if (time >= 5000) {
				resolve(time)
				return
			}
			average += time
		}
		average = parseInt(average / 3)
		resolve(average)
	})
}

function pingOnce(href) {
	return new Promise(async resolve => {
		let started
		let http = new XMLHttpRequest()
		http.timeout = 5000
		http.ontimeout = () => resolve(5000)
		http.onerror = () => resolve()
		http.onreadystatechange = () => {
			if (http.readyState == 2) {
				if (http.status == 200) {
					let ended = new Date().getTime()
					http.abort()
					resolve(ended - started)
				} else {
					resolve(5000 + http.status)
				}
			}
		}
		http.open("GET", `${href}?_=${new Date().getTime()}`, true)
		started = new Date().getTime()
		http.send(null)
	})
}

async function testLatency(element, instances, frontend) {
	return new Promise(async resolve => {
		let myList = {}
		let latencyThreshold, options
		browser.storage.local.get(["options"], r => {
			latencyThreshold = r.options.latencyThreshold
			options = r.options
		})
		for (const href of instances) {
			await ping(href).then(time => {
				let color
				if (time) {
					myList[href] = time
					if (time <= 1000) color = "green"
					else if (time <= 2000) color = "orange"
					else color = "red"

					if (time > latencyThreshold && options[frontend].clearnet.enabled.includes(href)) {
						options[frontend].clearnet.enabled.splice(options[frontend].clearnet.enabled.indexOf(href), 1)
					}

					let text
					if (time == 5000) text = "5000ms+"
					else if (time > 5000) text = `ERROR: ${time - 5000}`
					else text = `${time}ms`
					element.innerHTML = `${href}:&nbsp;<span style="color:${color};">${text}</span>`
				} else {
					myList[href] = -1
					color = "red"
					element.innerHTML = `${href}:&nbsp;<span style="color:${color};">Server not found</span>`
					if (options[frontend].clearnet.enabled.includes(href)) options[frontend].clearnet.enabled.splice(options[frontend].clearnet.enabled.indexOf(href), 1)
				}
			})
		}
		browser.storage.local.set({ options })
		resolve(myList)
	})
}

function copyCookie(targetUrl, urls, name) {
	return new Promise(resolve => {
		const query = {
			url: protocolHost(targetUrl),
			name: name,
		}
		browser.cookies.getAll(query, async cookies => {
			for (const cookie of cookies)
				if (cookie.name == name) {
					for (const url of urls) {
						const setQuery = {
							url: url,
							name: name,
							value: cookie.value,
							secure: true,
							expirationDate: cookie.expirationDate,
						}
						browser.cookies.set(setQuery)
					}
					break
				}
			resolve()
		})
	})
}

function getPreferencesFromToken(frontend, targetUrl, urls, name, endpoint) {
	return new Promise(resolve => {
		const http = new XMLHttpRequest()
		const url = `${targetUrl}${endpoint}`
		http.open("GET", url, false)
		//http.setRequestHeader("Cookie", `${name}=${cookie.value}`)
		http.send(null)
		const preferences = JSON.parse(http.responseText)
		let formdata = new FormData()
		for (var key in preferences) formdata.append(key, preferences[key])
		for (const url of urls) {
			const http = new XMLHttpRequest()
			http.open("POST", `${url}/settings/stay`, false)
			http.send(null)
		}
		resolve()
		return
	})
}

function copyRaw(test, copyRawElement) {
	return new Promise(resolve => {
		browser.tabs.query({ active: true, currentWindow: true }, async tabs => {
			let currTab = tabs[0]
			if (currTab) {
				let url
				try {
					url = new URL(currTab.url)
				} catch {
					resolve()
					return
				}

				const newUrl = await servicesHelper.reverse(url)

				if (newUrl) {
					resolve(newUrl)
					if (test) return
					navigator.clipboard.writeText(newUrl)
					if (copyRawElement) {
						const textElement = copyRawElement.getElementsByTagName("h4")[0]
						const oldHtml = textElement.innerHTML
						textElement.innerHTML = browser.i18n.getMessage("copied")
						setTimeout(() => (textElement.innerHTML = oldHtml), 1000)
					}
				}
			}
			resolve()
		})
	})
}

function unify() {
	return new Promise(resolve => {
		browser.tabs.query({ active: true, currentWindow: true }, async tabs => {
			let currTab = tabs[0]
			if (currTab) {
				let url
				try {
					url = new URL(currTab.url)
				} catch {
					resolve()
					return
				}

				resolve(await servicesHelper.unifyPreferences(url, currTab.id))
			}
		})
	})
}

function switchInstance(test) {
	return new Promise(resolve => {
		browser.tabs.query({ active: true, currentWindow: true }, async tabs => {
			let currTab = tabs[0]
			if (currTab) {
				let url
				try {
					url = new URL(currTab.url)
				} catch {
					resolve()
					return
				}
				const newUrl = await servicesHelper.switchInstance(url)

				if (newUrl) {
					if (!test) browser.tabs.update({ url: newUrl })
					resolve(true)
				} else resolve()
			}
		})
	})
}

function latency(service, frontend, document, location) {
	let latencyElement = document.getElementById(`latency-${frontend}`)
	let latencyLabel = document.getElementById(`latency-${frontend}-label`)
	latencyElement.addEventListener("click", async () => {
		let reloadWindow = () => location.reload()
		latencyElement.addEventListener("click", reloadWindow)
		browser.storage.local.get("redirects", r => {
			let redirects = r.redirects
			const oldHtml = latencyLabel.innerHTML
			latencyLabel.innerHTML = "..."
			testLatency(latencyLabel, redirects[frontend].clearnet, frontend).then(r => {
				const frontendLatency = r
				browser.storage.local.get("latency", r => {
					let latency = r.latency
					latency[frontend] = frontendLatency
					browser.storage.local.set({ latency })
					latencyLabel.innerHTML = oldHtml
					processDefaultCustomInstances(service, frontend, "clearnet", document)
					latencyElement.removeEventListener("click", reloadWindow)
				})
			})
		})
	})
}

export default {
	getRandomInstance,
	updateInstances,
	protocolHost,
	processDefaultCustomInstances,
	latency,
	copyCookie,
	getPreferencesFromToken,
	switchInstance,
	copyRaw,
	unify,
	camelCase,
}