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

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

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

    let user;
    let loading = true;
    $: channel = $page?.params?.channel;

    currentUser.subscribe((value) => {
        user = value;
    });

    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 () => {
        try {
            let response = await boot();
            switch (response.status) {
                case 200:
                    onBooted(response.data);
                    subscribeToEvents(response.data.resume_point);
                    break;
                case 401:
                    currentUser.update(() => null);
                    break;
                default:
                    // TODO: display error.
                    break;
            }
        } catch (_) {
            // I don't want exceptions on non-200 series responses, dammit.
        }
        loading = false;
	});
</script>

{#if loading}
    <h2>Loading&hellip;</h2>
{:else if user != null}
    <div id="interface">
        <div class="channel-list">
            <ChannelList active={channel} />
        </div>
        <div class="active-channel">
            <slot />
        </div>
        <div class="create-channel">
            <CreateChannelForm />
        </div>
        <div class="create-message">
            <MessageInput {channel} />
        </div>
    </div>
{:else}
    <LogIn />
{/if}

<style>
    #interface {
        height: 88vh;
        margin: 1rem;
        display: grid;
        grid-template-columns: 18rem auto;
        grid-template-rows: auto 2rem;
        grid-gap: 0.25rem;
    }
    #interface div {
        max-height: 100%;
        overflow: scroll;
    }
    #interface .active-channel {
        border: 1px solid grey;
        border-radius: 1.25rem;
    }
</style>
