import {store} from "../store/store.js"
import * as lsm from "../lsm.js"

let lastBatch = null

function resolveMxc(url, size, method) {
	const [server, id] = url.match(/^mxc:\/\/([^/]+)\/(.*)/).slice(1)
	if (size && method) {
		return `${lsm.get("domain")}/_matrix/media/r0/thumbnail/${server}/${id}?width=${size}&height=${size}&method=${method}`
	} else {
		return `${lsm.get("domain")}/_matrix/media/r0/download/${server}/${id}`
	}
}


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: 5
			},
			// 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

		// set up directs
		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
		Object.entries(root.rooms.join).forEach(([id, room]) => {
			if (!store.rooms.has(id)) {
				store.rooms.askAdd(id, room)
			}
			const timeline = store.rooms.get(id).value().timeline
			if (room.timeline.events.length) newEvents = true
			timeline.updateEvents(room.timeline.events)
		})

		// set up 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)
							}
						})
					})
				}
			})
		).then(() => {
			store.rooms.sort()
		})
		if (newEvents) store.newEvents.broadcast("changeSelf")
	} catch (e) {
		console.error(root)
		throw e
	}
}

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

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

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

syncLoop()