<script>
	import { page } from '$app/stores';
	import { goto } from '$app/navigation';
	import { onMount, onDestroy } from 'svelte';

	import { boot, subscribeToEvents } from '$lib/apiServer';
	import { showMenu, currentUser, logins, channelsList, messages } from '$lib/store';

	import ChannelList from '$lib/components/ChannelList.svelte';
	import CreateChannelForm from '$lib/components/CreateChannelForm.svelte';
	import MessageInput from '$lib/components/MessageInput.svelte';

	let loading = true;
	let events = null;

	$: channel = $page?.params?.channel;

	function onBooted(boot) {
		currentUser.update(() => ({
			id: boot.login.id,
			username: boot.login.name
		}));
		logins.update((value) => value.setLogins(boot.logins));
		channelsList.update((value) => value.setChannels(boot.channels));
		messages.update((value) => value.setMessages(boot.messages));
	}

	onMount(async () => {
		let response = await boot();
		switch (response.status) {
			case 200:
				onBooted(response.data);
				events = subscribeToEvents(response.data.resume_point);
				break;
			case 401:
				currentUser.update(() => null);
				goto('/login');
				break;
			case 503:
				currentUser.update(() => null);
				goto('/setup');
				break;
			default:
				// TODO: display error.
				break;
		}
		loading = false;
	});

	onDestroy(async () => {
		if (events !== null) {
			events.close();
		}
	});
</script>

<svelte:head>
	<title>understory</title>
</svelte:head>

{#if loading}
	<h2>Loading&hellip;</h2>
{:else}
	<div id="interface" class="p-2">
		<nav id="sidebar" data-expanded={$showMenu}>
			<div class="channel-list">
				<ChannelList active={channel} />
			</div>
			<div class="create-channel">
				<CreateChannelForm />
			</div>
		</nav>
		<main>
			<div class="active-channel">
				<slot />
			</div>
			<div class="create-message max-h-full">
				<MessageInput {channel} />
			</div>
		</main>
	</div>
{/if}

<style>
	:root {
		--app-bar-height: 68px;
		--input-row-height: 2rem;
		--interface-padding: 16px;
	}

	#interface {
		margin: unset;
		display: grid;
		grid-template:
			'side main' 1fr
			/ auto 1fr;
		height: calc(100vh - var(--app-bar-height));

		@media (width > 640px) {
			--overlay: static;
			--translate: 0;
		}
	}
	nav {
		grid-area: side;
		background-color: rgb(var(--color-surface-800));
		inset: auto auto 0 0;
		padding: 0.25rem;
		position: var(--overlay, absolute);
		transition: translate 300ms ease-out;
		width: 21rem;
		height: calc(100vh - var(--app-bar-height) - var(--interface-padding));
		z-index: 10;
	}
	main {
		grid-area: main;
		height: calc(100vh - var(--app-bar-height) - var(--interface-padding));
	}
	.active-channel {
		height: calc(
			100vh - var(--app-bar-height) - var(--interface-padding) - var(--input-row-height)
		);
		overflow: auto;
	}
	.channel-list {
		height: calc(
			100vh - var(--app-bar-height) - var(--interface-padding) - var(--input-row-height)
		);
		overflow: auto;
	}
	nav[data-expanded='false'] {
		translate: var(--translate, -100% 0);
	}
</style>
