// TODO: Probably reset state on disconnect, and indicate to user.
let socket = new WebSocket(proxy)

let commandSeq = 0
function send(command) {
	socket.send(JSON.stringify({commandSeq: ++commandSeq, data: command}))
}

socket.onopen = function(event) {
	send({command: 'Hello', version: 1})
}

let buffers = new Map()
let bufferCurrent = undefined

socket.onmessage = function(event) {
	console.log(event.data)

	let e = JSON.parse(event.data).data
	switch (e.event) {
	case 'BufferUpdate':
	{
		let b = buffers.get(e.bufferName)
		if (b === undefined) {
			b = {lines: []}
			buffers.set(e.bufferName, b)
		}
		// TODO: Update any buffer properties.
		break
	}
	case 'BufferRename':
		buffers.set(e.new, buffers.get(e.bufferName))
		buffers.delete(e.bufferName)
		break
	case 'BufferRemove':
		buffers.delete(e.bufferName)
		break
	case 'BufferActivate':
		bufferCurrent = e.bufferName
		// TODO: Somehow scroll to the end of it immediately.
		// TODO: Focus the textarea.
		break
	case 'BufferLine':
	{
		let b = buffers.get(e.bufferName)
		if (b !== undefined)
			b.lines.push({when: e.when, rendition: e.rendition, items: e.items})
		break
	}
	case 'BufferClear':
	{
		let b = buffers.get(e.bufferName)
		if (b !== undefined)
			b.lines.length = 0
		break
	}
	}

	m.redraw()
}

let BufferList = {
	view: vnode => {
		let items = []
		buffers.forEach((b, name) => {
			let attrs = {
				onclick: e => {
					send({command: 'BufferActivate', bufferName: name})
				},
			}
			if (name == bufferCurrent)
				attrs.class = 'active'
			items.push(m('.item', attrs, name))
		})
		return m('.list', {}, items)
	},
}

let Content = {
	view: vnode => {
		let line = vnode.children[0]
		let content = []
		switch (line.rendition) {
		case 'Indent': content.push(m('span.mark',       {}, ''));  break
		case 'Status': content.push(m('span.mark',       {}, '–')); break
		case 'Error':  content.push(m('span.mark.error', {}, '⚠')); break
		case 'Join':   content.push(m('span.mark.join',  {}, '→')); break
		case 'Part':   content.push(m('span.mark.part',  {}, '←')); break
		}

		let classes = new Set()
		let flip = c => {
			if (classes.has(c))
				classes.delete(c)
			else
				classes.add(c)
		}
		line.items.forEach(item => {
			// TODO: Colours.
			switch (item.kind) {
			case 'Text':
				// TODO: Detect and transform links.
				content.push(m('span', {
					class: Array.from(classes.keys()).join(' '),
				}, item.text))
				break
			case 'Reset':
				classes.clear()
				break
			case 'FlipBold':       flip('b'); break
			case 'FlipItalic':     flip('i'); break
			case 'FlipUnderline':  flip('u'); break
			case 'FlipInverse':    flip('i'); break
			case 'FlipCrossedOut': flip('s'); break
			case 'FlipMonospace':  flip('m'); break
			}
		})
		return m('.content', {}, content)
	},
}

let Buffer = {
	view: vnode => {
		let lines = []
		let b = buffers.get(bufferCurrent)
		if (b === undefined)
			return

		let lastDateMark = undefined
		b.lines.forEach(line => {
			let date = new Date(line.when * 1000)
			let dateMark = date.toLocaleDateString()
			if (dateMark !== lastDateMark) {
				lines.push(m('.date', {}, dateMark))
				lastDateMark = dateMark
			}

			lines.push(m('.time', {}, date.toLocaleTimeString()))
			lines.push(m(Content, {}, line))
		})
		return m('.buffer-container', {}, [
			m('.filler'),
			m('.buffer', {}, lines),
		])
	},
}

// TODO: This should be remembered across buffer switches,
// and we'll probably have to intercept /all/ key presses.
let Input = {
	view: vnode => {
		return m('textarea', {
			rows: 1,
			onkeydown: e => {
				// TODO: And perhaps on other actions, too.
				send({command: 'Active'})
				if (e.keyCode !== 13)
					return

				send({
					command: 'BufferInput',
					bufferName: bufferCurrent,
					text: e.currentTarget.value,
				})
				e.preventDefault()
				e.currentTarget.value = ''
			},
		})
	},
}

let Main = {
	view: vnode => {
		return m('.xP', {}, [
			m('.title', {}, "xP"),
			m('.middle', {}, [m(BufferList), m(Buffer)]),
			m('.status', {}, bufferCurrent),
			m(Input),
		])
	},
}

// TODO: Buffer names should work as routes.
window.addEventListener('load', () => {
	m.route(document.body, '/', {
		'/': Main,
	})
})