src/routes/+page.svelte

<script lang="ts">
	import { fetchEventSource } from '@microsoft/fetch-event-source';
	import ChatBox from '$lib/chat/ChatBox.svelte';
	import ChatIntroduction from '$lib/chat/ChatIntroduction.svelte';
	const ENDPOINT = 'https://joi-20b.ngrok.io/generate_stream';

	type Message =
		| {
				from: 'user';
				content: string;
		  }
		| {
				from: 'bot';
				content: string;
		  };

	let messages: Message[] = [];
	let message = '';

	function onWrite() {
		messages = [...messages, { from: 'user', content: message }];
		message = '';
		let incoming = '';
		const inputs =
			messages
				.map((m) => (m.from === 'user' ? `User: ${m.content}\n` : `Joi:${m.content}\n`))
				.join('\n') + '\nJoi:';

		fetchEventSource(ENDPOINT, {
			method: 'POST',
			headers: {
				Accept: 'text/event-stream',
				'Content-Type': 'application/json'
			},
			body: JSON.stringify({
				inputs: inputs,
				parameters: {
					temperature: 0.5,
					top_p: 0.95,
					do_sample: true,
					max_new_tokens: 512,
					top_k: 4,
					repetition_penalty: 1.03,
					stop: ['User:']
				}
			}),
			async onopen(response) {
				if (response.ok && response.headers.get('content-type') === 'text/event-stream') {
					messages = [...messages, { from: 'bot', content: incoming }];
				} else {
					console.error('error opening the SSE endpoint');
				}
			},
			onmessage(msg) {
				const data = JSON.parse(msg.data);
				// console.log(data);
				messages.at(-1)!.content += data.token.text;
				messages = messages;
			}
		});
	}
</script>

<div
	class="grid h-screen w-screen md:grid-cols-[280px,1fr] overflow-hidden text-smd dark:text-gray-300"
>
	<nav
		class="max-md:hidden grid grid-rows-[auto,1fr,auto] grid-cols-1 max-h-screen bg-gradient-to-l from-gray-50 dark:from-gray-800/30"
	>
		<div class="flex-none sticky top-0 relative p-3 flex flex-col">
			<button
				class="border px-12 py-2.5 rounded-lg border shadow bg-white dark:bg-gray-700 dark:border-gray-600"
				>New Chat</button
			>
		</div>
		<div class="flex flex-col overflow-y-auto p-3 -mt-3 gap-2">
			{#each Array(5) as _}
				<a
					href="/"
					class="truncate py-3 px-3 rounded-lg flex-none text-gray-500 dark:text-gray-400 hover:bg-gray-100 dark:hover:bg-gray-700"
				>
					Amet consectetur adipisicing elit. Eos dolorum nihil alias.
				</a>
			{/each}
		</div>
		<div class="flex flex-col p-3 gap-2">
			<a
				href="/"
				class="truncate py-3 px-3 rounded-lg flex-none text-gray-500 dark:text-gray-400 hover:bg-gray-100 dark:hover:bg-gray-700"
			>
				Appearance
			</a>
			<a
				href="/"
				class="truncate py-3 px-3 rounded-lg flex-none text-gray-500 dark:text-gray-400 hover:bg-gray-100 dark:hover:bg-gray-700"
			>
				Settings
			</a>
		</div>
	</nav>
	<div class="relative h-screen">
		<div class="overflow-y-auto h-full">
			<div class="max-w-3xl xl:max-w-4xl mx-auto px-5 pt-6 flex flex-col gap-8 h-full">
				{#each messages as message}
					<ChatBox {message} />
				{:else}
					<ChatIntroduction title="Joi 20B Instruct" />
				{/each}
				<div class="h-32 flex-none" />
			</div>
		</div>
		<div
			class="flex items-center bg-gradient-to-t from-white dark:from-gray-900 to-transparent justify-center absolute inset-x-0 max-w-3xl xl:max-w-4xl mx-auto px-5 bottom-0 h-32 w-full"
		>
			<form
				on:submit={onWrite}
				class="shadow-alternate relative flex items-center rounded-xl flex-1 max-w-4xl border bg-gray-100 dark:bg-gray-700 dark:border-gray-600"
			>
				<svg
					class="absolute left-3 text-gray-300 top-1/2 transform -translate-y-1/2 pointer-events-none"
					xmlns="http://www.w3.org/2000/svg"
					xmlns:xlink="http://www.w3.org/1999/xlink"
					aria-hidden="true"
					focusable="false"
					role="img"
					width="1em"
					height="1em"
					preserveAspectRatio="xMidYMid meet"
					viewBox="0 0 32 32"
					><path
						d="M30 28.59L22.45 21A11 11 0 1 0 21 22.45L28.59 30zM5 14a9 9 0 1 1 9 9a9 9 0 0 1-9-9z"
						fill="currentColor"
					/></svg
				>
				<input
					class="flex-1 border-none bg-transparent px-1 py-3 pr-3 pl-10 outline-none"
					bind:value={message}
					on:submit={onWrite}
					placeholder="Ask anything"
					autofocus
				/>
			</form>
		</div>
	</div>
</div>