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

import utils from "./utils.js"

const targets = [/^https?:\/{2}(?:www\.|)imdb\.com.*/]

const frontends = new Array("libremdb")
const protocols = new Array("normal", "tor", "i2p", "loki")

let redirects = {}

for (let i = 0; i < frontends.length; i++) {
	redirects[frontends[i]] = {}
	for (let x = 0; x < protocols.length; x++) {
		redirects[frontends[i]][protocols[x]] = []
	}
}

function setRedirects(val) {
	browser.storage.local.get("cloudflareBlackList", r => {
		redirects.libremdb = val
		libremdbNormalRedirectsChecks = [...redirects.libremdb.normal]
		for (const instance of r.cloudflareBlackList) {
			const a = libremdbNormalRedirectsChecks.indexOf(instance)
			if (a > -1) libremdbNormalRedirectsChecks.splice(a, 1)
		}
		browser.storage.local.set({
			imdbRedirects: redirects,
			libremdbNormalRedirectsChecks,
		})
	})
}

let disableImdb,
	protocol,
	protocolFallback,
	imdbRedirects,
	libremdbNormalRedirectsChecks,
	libremdbNormalCustomRedirects,
	libremdbTorRedirectsChecks,
	libremdbTorCustomRedirects,
	libremdbI2pCustomRedirects,
	libremdbLokiCustomRedirects

function init() {
	return new Promise(async resolve => {
		browser.storage.local.get(
			[
				"disableImdb",
				"protocol",
				"protocolFallback",
				"imdbRedirects",
				"libremdbNormalRedirectsChecks",
				"libremdbNormalCustomRedirects",
				"libremdbTorRedirectsChecks",
				"libremdbTorCustomRedirects",
				"libremdbI2pCustomRedirects",
				"libremdbLokiCustomRedirects",
			],
			r => {
				disableImdb = r.disableImdb
				protocol = r.protocol
				protocolFallback = r.protocolFallback
				imdbRedirects = r.imdbRedirects
				libremdbNormalRedirectsChecks = r.libremdbNormalRedirectsChecks
				libremdbNormalCustomRedirects = r.libremdbNormalCustomRedirects
				libremdbTorRedirectsChecks = r.libremdbTorRedirectsChecks
				libremdbTorCustomRedirects = r.libremdbTorCustomRedirects
				libremdbI2pCustomRedirects = r.libremdbI2pCustomRedirects
				libremdbLokiCustomRedirects = r.libremdbLokiCustomRedirects
				resolve()
			}
		)
	})
}

init()
browser.storage.onChanged.addListener(init)

function redirect(url, type, initiator, disableOverride) {
	if (disableImdb && !disableOverride) return
	if (url.pathname == "/") return
	if (type != "main_frame") return
	const all = [...imdbRedirects.libremdb.normal, ...libremdbNormalCustomRedirects]
	if (initiator && (all.includes(initiator.origin) || targets.includes(initiator.host))) return
	if (!targets.some(rx => rx.test(url.href))) return

	let instancesList = []
	if (protocol == "loki") instancesList = [...libremdbLokiCustomRedirects]
	else if (protocol == "i2p") instancesList = [...libremdbI2pCustomRedirects]
	else if (protocol == "tor") instancesList = [...libremdbTorRedirectsChecks, ...libremdbTorCustomRedirects]
	if ((instancesList.length === 0 && protocolFallback) || protocol == "normal") {
		instancesList = [...libremdbNormalRedirectsChecks, ...libremdbNormalCustomRedirects]
	}
	if (instancesList.length === 0) {
		return
	}

	const randomInstance = utils.getRandomInstance(instancesList)
	return `${randomInstance}${url.pathname}`
}

function reverse(url) {
	return new Promise(async resolve => {
		await init()
		let protocolHost = utils.protocolHost(url)
		const all = [
			...imdbRedirects.libremdb.normal,
			...imdbRedirects.libremdb.tor,
			...libremdbNormalCustomRedirects,
			...libremdbTorCustomRedirects,
			...libremdbI2pCustomRedirects,
			...libremdbLokiCustomRedirects,
		]
		if (!all.includes(protocolHost)) {
			resolve()
			return
		}

		resolve(`https://imdb.com${url.pathname}${url.search}`)
	})
}

function switchInstance(url, disableOverride) {
	return new Promise(async resolve => {
		await init()
		if (disableImdb && !disableOverride) {
			resolve()
			return
		}
		let protocolHost = utils.protocolHost(url)
		const all = [
			...imdbRedirects.libremdb.tor,
			...imdbRedirects.libremdb.normal,

			...libremdbNormalCustomRedirects,
			...libremdbTorCustomRedirects,
			...libremdbI2pCustomRedirects,
			...libremdbLokiCustomRedirects,
		]
		if (!all.includes(protocolHost)) {
			resolve()
			return
		}

		let instancesList = []
		if (protocol == "loki") instancesList = [...libremdbLokiCustomRedirects]
		else if (protocol == "i2p") instancesList = [...libremdbI2pCustomRedirects]
		else if (protocol == "tor") instancesList = [...libremdbTorRedirectsChecks, ...libremdbTorCustomRedirects]
		if ((instancesList.length === 0 && protocolFallback) || protocol == "normal") {
			instancesList = [...libremdbNormalRedirectsChecks, ...libremdbNormalCustomRedirects]
		}

		const i = instancesList.indexOf(protocolHost)
		if (i > -1) instancesList.splice(i, 1)
		if (instancesList.length === 0) {
			resolve()
			return
		}

		const randomInstance = utils.getRandomInstance(instancesList)
		resolve(`${randomInstance}${url.pathname}${url.search}`)
	})
}

function initDefaults() {
	return new Promise(async resolve => {
		fetch("/instances/data.json")
			.then(response => response.text())
			.then(async data => {
				let dataJson = JSON.parse(data)
				for (let i = 0; i < frontends.length; i++) {
					redirects[frontends[i]] = dataJson[frontends[i]]
				}
				browser.storage.local.set(
					{
						disableImdb: true,
						imdbRedirects: redirects,

						libremdbNormalRedirectsChecks: [...redirects.libremdb.normal],
						libremdbNormalCustomRedirects: [],

						libremdbTorRedirectsChecks: [...redirects.libremdb.tor],
						libremdbTorCustomRedirects: [],

						libremdbI2pRedirectsChecks: [],
						libremdbI2pCustomRedirects: [],

						libremdbLokiRedirectsChecks: [],
						libremdbLokiCustomRedirects: [],
					},
					() => resolve()
				)
			})
	})
}

export default {
	setRedirects,

	redirect,
	reverse,
	switchInstance,

	initDefaults,
}