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<script lang="ts">
import { untrack } from "svelte";
import { tabStore } from "../tabs.svelte.js";
import ChatMessageComponent from "./ChatMessage.svelte";
let messagesEl: HTMLDivElement | undefined;
let userScrolledUp = $state(false);
let isAutoScrolling = false;
const messages = $derived(tabStore.activeTab?.messages ?? []);
const activeTabId = $derived(tabStore.activeTab?.id);
function isNearBottom(el: HTMLElement): boolean {
return el.scrollHeight - el.scrollTop - el.clientHeight < 64;
}
function scrollToBottom(animate = false) {
if (!messagesEl) return;
messagesEl.scrollTo({
top: messagesEl.scrollHeight,
behavior: animate ? "smooth" : "instant",
});
}
function handleScroll() {
if (!messagesEl || isAutoScrolling) return;
userScrolledUp = !isNearBottom(messagesEl);
}
function resumeAutoScroll() {
userScrolledUp = false;
isAutoScrolling = true;
scrollToBottom(true);
}
$effect(() => {
const count = messages.length;
void count;
if (messagesEl) {
untrack(() => {
if (!userScrolledUp) scrollToBottom(false);
});
}
});
</script>
<div class="flex flex-col h-full">
<!-- Messages -->
<div class="relative flex-1 min-h-0">
<div
bind:this={messagesEl}
class="h-full overflow-y-auto p-4"
onscroll={handleScroll}
onscrollend={() => {
isAutoScrolling = false;
}}
>
{#if messages.length === 0}
<div class="flex items-center justify-center h-full text-base-content/40 text-sm">
Send a message to start a conversation
</div>
{/if}
{#each messages as message (message.id)}
<ChatMessageComponent {message} tabId={activeTabId} />
{/each}
</div>
<!-- Scroll-to-bottom button -->
<button
type="button"
class="absolute bottom-0 left-1/2 -translate-x-1/2 mb-4 btn btn-sm px-8 rounded-lg shadow-lg transition-opacity duration-200 {userScrolledUp ? 'opacity-100' : 'opacity-0 pointer-events-none'}"
onclick={resumeAutoScroll}
aria-label="Scroll to bottom"
tabindex={userScrolledUp ? 0 : -1}
>
▼
</button>
</div>
</div>
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