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<script lang="ts">
import type { Tab } from "../tabs";
import { isStuckToEnd, shortHandle } from "../tabs";
let {
tabs,
activeConversationId,
statusFor,
onSelect,
onClose,
onNewDraft,
onRename,
}: {
tabs: readonly Tab[];
activeConversationId: string | null;
/** Returns the conversation's lifecycle status, or undefined when unknown. */
statusFor?: (conversationId: string) => string | undefined;
onSelect: (conversationId: string) => void;
onClose: (conversationId: string) => void;
onNewDraft: () => void;
onRename?: (conversationId: string, title: string) => void;
} = $props();
// The new-chat button is `position: sticky; right: 0`. It floats over the tabs
// only while the strip overflows and isn't scrolled fully right; we square its
// right edge only in that "stuck" state. Pure decision (`isStuckToEnd`) +
// DOM-measurement at the edge here.
let scrollEl = $state<HTMLDivElement>();
let stuck = $state(false);
// Git-style short handle (shortest unique prefix) per open tab — the visible
// "tab ID". Derived from the set of open conversation ids; pure helper.
const handles = $derived.by(() => {
const ids = tabs.map((t) => t.conversationId);
const map = new Map<string, string>();
for (const id of ids) map.set(id, shortHandle(id, ids));
return map;
});
function recompute(): void {
const el = scrollEl;
if (el === undefined) {
stuck = false;
return;
}
stuck = isStuckToEnd({
scrollLeft: el.scrollLeft,
clientWidth: el.clientWidth,
scrollWidth: el.scrollWidth,
});
}
$effect(() => {
const el = scrollEl;
if (el === undefined) return;
// Re-evaluate when the tab set changes (overflow may appear/disappear).
void tabs;
recompute();
el.addEventListener("scroll", recompute, { passive: true });
const ro =
typeof ResizeObserver !== "undefined" ? new ResizeObserver(recompute) : undefined;
ro?.observe(el);
return () => {
el.removeEventListener("scroll", recompute);
ro?.disconnect();
};
});
// Inline rename: double-click a tab's title to edit, Enter/blur to save.
let editingId = $state<string | null>(null);
let editValue = $state("");
let editEl = $state<HTMLInputElement>();
function startRename(tab: Tab): void {
if (onRename === undefined) return;
editingId = tab.conversationId;
editValue = tab.title;
// Focus the input after it renders.
queueMicrotask(() => editEl?.focus());
}
function commitRename(): void {
const id = editingId;
if (id !== null && onRename !== undefined) {
const trimmed = editValue.trim();
if (trimmed.length > 0) onRename(id, trimmed);
}
editingId = null;
}
function cancelRename(): void {
editingId = null;
}
</script>
<div bind:this={scrollEl} class="min-w-0 flex-1 overflow-x-auto">
<div class="tabs tabs-lift min-w-max">
{#each tabs as tab (tab.conversationId)}
<div
class="tab flex w-48 shrink-0 items-center gap-1.5"
class:tab-active={tab.conversationId === activeConversationId}
role="tab"
tabindex="0"
onclick={() => onSelect(tab.conversationId)}
onkeydown={(e) => {
if (e.key === "Enter") onSelect(tab.conversationId);
}}
>
<span
class="shrink-0 rounded bg-base-300 px-1 py-0.5 font-mono text-[10px] leading-none text-base-content/60"
title="Tab ID"
>
{handles.get(tab.conversationId) ?? tab.conversationId}
</span>
{#if editingId === tab.conversationId}
<input
bind:this={editEl}
bind:value={editValue}
class="min-w-0 flex-1 rounded bg-base-100 px-1 py-0.5 text-left text-sm outline outline-1 outline-primary"
onclick={(e) => e.stopPropagation()}
onkeydown={(e) => {
if (e.key === "Enter") {
e.preventDefault();
commitRename();
} else if (e.key === "Escape") {
e.preventDefault();
cancelRename();
}
}}
onblur={commitRename}
/>
{:else}
<span
class="min-w-0 flex-1 cursor-pointer truncate text-left"
role="button"
tabindex="-1"
title="Double-click to rename"
ondblclick={(e) => {
e.stopPropagation();
startRename(tab);
}}
>
{tab.title}
</span>
{/if}
{#if statusFor?.(tab.conversationId) === "active"}
<span class="loading loading-spinner loading-xs shrink-0 text-primary"></span>
{/if}
<button
class="btn btn-ghost btn-xs shrink-0"
aria-label="Close tab"
onclick={(e) => {
e.stopPropagation();
onClose(tab.conversationId);
}}
>
×
</button>
</div>
{/each}
<button
class="tab sticky right-0 z-10 bg-base-200 shadow-[-2px_0_4px_-1px_rgba(0,0,0,0.2)] {stuck
? '!rounded-se-none !rounded-ee-none'
: ''}"
class:tab-active={activeConversationId === null}
aria-label="New chat"
onclick={() => onNewDraft()}
>
{#if activeConversationId === null}
<span class="max-w-[120px] truncate">New Chat</span>
<span class="btn btn-ghost btn-xs ml-1" aria-hidden="true">+</span>
{:else}
+
{/if}
</button>
</div>
</div>
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