const API_URL = 'https://wgapi-test-admin-backend.ksn.gf4'

function Peer(data) {
	this.domain = data.domain
	this.pubkey = data.pubkey
	this.ipv4 = data.ipv4
	this.ipv6 = data.ipv6
	this.isDeleting = ko.observable(false)
	this.deleteText = ko.computed(() => this.isDeleting()?'Deleting...':'Delete')
}

function PeerList() {
	let self = this
	self.peers = ko.observableArray([])
	self.newPeerName = ko.observable('')
	self.newConfigText = ko.observable('')
	self.isAdding = ko.observable(false)
	self.addText = ko.computed(() => self.isAdding()?'Adding...':'Add')
	
	// Initial loading
	self.getUser = async () => {
		let res; try {
			res = await fetch(`${API_URL}/peer/`)
		} catch (err) {
			if (err) console.error(err)
			alert('Failed to contact API and load peers list.  Check your wireguard connection.  ')
		} if (!res.ok) {
			if (res.status) console.log(res.status)
			alert('Failed to contact API and load peers list.  Check your wireguard connection.  ')
		} else {
			let user; try {
				user = await res.json()
			} catch (err) {
				console.error('Failed to parse JSON!')
				if (err) console.error(err)
			}
			self.peers(
				user.peers.sort(
					(a,b) => a.ipv4 - b.ipv4)
				.map( (i)=>new Peer(i))
			)
			self.token = user.token
		}
	}
	
	self.addPeer = async () => {
		self.isAdding(true)
		const validName = self.newPeerName().trim().toLowerCase()
		if (validName.length === 0) {
			alert('Please enter a hostname.')
			self.isAdding(false)
		} else if (!/^([\-\_a-z0-9]{3,12})$/.test(validName)) {
			alert('Name must be 3-12 alphanumeric chars.')
			self.isAdding(false)
		} else if (self.peers().map((peer)=>peer.domain.split('.')[0]).includes(validName)) {
			alert(`You already have a peer named ${validName}!`)
			self.isAdding(false)
		} else {
			const url = `${API_URL}/?t=${self.token}&name=${validName}`
			let res; try {
				res = await fetch(url, {method: 'POST'})
			} catch (err) {
				alert('Failed to contact server.  Are you online?')
				if (err) console.error(err)
				self.isAdding(false)
			}
			let parsedRes; try {
				parsedRes = await res.text()
			} catch (err) {
				if (err) console.error(err)
			} finally { self.isAdding(false) }
			if (!res.ok) {
				alert(res.status)
			} else {
				self.newPeerName('')
				self.peers.push(new Peer({domain:`${validName}`}))
				self.newConfigText(parsedRes)
			}
		}
	}
	// Listen for user hitting enter key
	self.addKeyPress = (d,e) => {
		if (e.keyCode === 13) self.addPeer()
		return true
	}
	
	self.delPeer = async (peer) => {
		if (confirm(`Are you sure you want to delete ${peer.domain}?`)) {
			peer.isDeleting(true)
			const url = `${API_URL}/?t=${self.token}&pubkey=${peer.pubkey}`
			try {
				const res = await fetch(url, {method: 'DELETE'})
				if (res.ok) self.peers.remove(peer)
				else {
					if (res.status===404) self.peers.remove(peer)
					try {
						alert(await res.text())
					} catch (err) {
						console.error(`Failed to parse DELETE response into text`)
						if (err) console.error(err)
					} finally { peer.isDeleting(false) }
				}
			} catch (err) {
				alert(`Failed to contact the server.  Are you online?`)
			} finally { peer.isDeleting(false) }
		}
	}
	
	self.getUser()
}

ko.applyBindings(new PeerList())