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components/assistant-ui/thread-list.tsx

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+import type { FC } from "react";
+import {
+  ThreadListItemPrimitive,
+  ThreadListPrimitive,
+} from "@assistant-ui/react";
+import { ArchiveIcon, PlusIcon } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import { TooltipIconButton } from "@/components/assistant-ui/tooltip-icon-button";
+
+export const ThreadList: FC = () => {
+  return (
+    <ThreadListPrimitive.Root className="flex flex-col items-stretch gap-1.5">
+      <ThreadListNew />
+      <ThreadListItems />
+    </ThreadListPrimitive.Root>
+  );
+};
+
+const ThreadListNew: FC = () => {
+  return (
+    <ThreadListPrimitive.New asChild>
+      <Button className="data-[active]:bg-muted hover:bg-muted flex items-center justify-start gap-1 rounded-lg px-2.5 py-2 text-start" variant="ghost">
+        <PlusIcon />
+        New Thread
+      </Button>
+    </ThreadListPrimitive.New>
+  );
+};
+
+const ThreadListItems: FC = () => {
+  return <ThreadListPrimitive.Items components={{ ThreadListItem }} />;
+};
+
+const ThreadListItem: FC = () => {
+  return (
+    <ThreadListItemPrimitive.Root className="data-[active]:bg-muted hover:bg-muted focus-visible:bg-muted focus-visible:ring-ring flex items-center gap-2 rounded-lg transition-all focus-visible:outline-none focus-visible:ring-2">
+      <ThreadListItemPrimitive.Trigger className="flex-grow px-3 py-2 text-start">
+        <ThreadListItemTitle />
+      </ThreadListItemPrimitive.Trigger>
+      <ThreadListItemArchive />
+    </ThreadListItemPrimitive.Root>
+  );
+};
+
+const ThreadListItemTitle: FC = () => {
+  return (
+    <p className="text-sm">
+      <ThreadListItemPrimitive.Title fallback="New Chat" />
+    </p>
+  );
+};
+
+const ThreadListItemArchive: FC = () => {
+  return (
+    <ThreadListItemPrimitive.Archive asChild>
+      <TooltipIconButton
+        className="hover:text-primary text-foreground ml-auto mr-3 size-4 p-0"
+        variant="ghost"
+        tooltip="Archive thread"
+      >
+        <ArchiveIcon />
+      </TooltipIconButton>
+    </ThreadListItemPrimitive.Archive>
+  );
+};