const {store} = require("../store/store.js")
const lsm = require("../lsm.js")
const {resolveMxc} = require("../functions.js")

let lastBatch = null

function sync() {
	const url = new URL(`${lsm.get("domain")}/_matrix/client/r0/sync`)
	url.searchParams.append("access_token", lsm.get("access_token"))
	const filter = {
		room: {
			// pulling more from the timeline massively increases download size
			timeline: {
				limit: 1
			},
			// members are not currently needed
			state: {
				lazy_load_members: true
			}
		},
		presence: {
			// presence is not implemented, ignore it
			types: []
		}
	}
	url.searchParams.append("filter", JSON.stringify(filter))
	url.searchParams.append("timeout", 20000)
	if (lastBatch) {
		url.searchParams.append("since", lastBatch)
	}
	return fetch(url.toString()).then(res => res.json()).then(root => {
		lastBatch = root.next_batch
		return root
	})
}

function manageSync(root) {
	try {
		let newEvents = false
		let notificationsChange = false

		// set up directs
		if (root.account_data) {
			const directs = root.account_data.events.find(e => e.type === "m.direct")
			if (directs) {
				Object.values(directs.content).forEach(ids => {
					ids.forEach(id => store.directs.add(id))
				})
			}
		}

		// set up rooms
		if (root.rooms) {
			if (root.rooms.join) {
				Object.entries(root.rooms.join).forEach(([id, data]) => {
					if (!store.rooms.has(id)) {
						store.rooms.askAdd(id, data)
					}
					const room = store.rooms.get(id).value()
					const timeline = room.timeline
					if (data.state && data.state.events) timeline.updateStateEvents(data.state.events)
					if (data.timeline && data.timeline.events) {
						if (!timeline.from) timeline.from = data.timeline.prev_batch
						if (data.timeline.events.length) {
							newEvents = true
							timeline.updateEvents(data.timeline.events)
						}
					}
					if (data.ephemeral && data.ephemeral.events) timeline.updateEphemeral(data.ephemeral.events)
					if (data.unread_notifications) {
						timeline.updateNotificationCount(data.unread_notifications.notification_count)
						notificationsChange = true
					}
					if (data["org.matrix.msc2654.unread_count"] != undefined) {
						timeline.updateUnreadCount(data["org.matrix.msc2654.unread_count"])
						notificationsChange = true
					}
				})
			}
		}

		// set up groups
		if (root.groups) {
			Promise.all(
				Object.keys(root.groups.join).map(id => {
					if (!store.groups.has(id)) {
						return Promise.all(["profile", "rooms"].map(path => {
							const url = new URL(`${lsm.get("domain")}/_matrix/client/r0/groups/${id}/${path}`)
							url.searchParams.append("access_token", lsm.get("access_token"))
							return fetch(url.toString()).then(res => res.json())
						})).then(([profile, rooms]) => {
							rooms = rooms.chunk
							let order = 999
							let orderEvent = root.account_data.events.find(e => e.type === "im.vector.web.tag_ordering")
							if (orderEvent) {
								if (orderEvent.content.tags.includes(id)) {
									order = orderEvent.content.tags.indexOf(id)
								}
							}
							const data = {
								name: profile.name,
								icon: resolveMxc(profile.avatar_url, 96, "crop"),
								order
							}
							store.groups.askAdd(id, data)
							rooms.forEach(groupRoom => {
								if (store.rooms.has(groupRoom.room_id)) {
									store.rooms.get(groupRoom.room_id).value().setGroup(id)
								}
							})
							store.newEvents.broadcast("changeSelf") // trigger a room list update
						})
					}
				})
			).then(() => {
				store.rooms.sort()
			})
		}

		if (newEvents) store.newEvents.broadcast("changeSelf")
		if (notificationsChange) store.notificationsChange.broadcast("changeSelf")
	} catch (e) {
		console.error(root)
		throw e
	}
}

function syncLoop() {
	return sync().then(manageSync).then(syncLoop)
}

;[
	{
		id: "directs",
		name: "Directs",
		icon: staticFiles.get("/assets/icons/directs.svg"),
		order: -2
	},
	{
		id: "channels",
		name: "Channels",
		icon: staticFiles.get("/assets/icons/channels.svg"),
		order: -1
	}
].forEach(data => store.groups.askAdd(data.id, data))

store.activeGroup.set(store.groups.get("directs").value())

if (lsm.get("access_token")) {
	syncLoop()
}