feat: add chat search implementation

app/(chat)/api/search/route.ts

@@ -0,0 +1,99 @@
+import { auth } from "@/app/(auth)/auth";
+import { searchChatsByUserId } from "@/lib/db/queries";
+import { groupChatsByDate } from "@/lib/utils";
+
+function transformSearchResults(searchResults: any[], query: string) {
+  return searchResults.map((result) => {
+    let preview = result.preview;
+    let contextPreview = "";
+
+    try {
+      // NOTE: user messages stored in our DB are plain string & tool call results are stored as JSON.
+      // TODO: As tool call results have different schemas in the DB, we only show no preview available for now
+      if (result.role !== "user") {
+        preview = "No preview available";
+
+        // LLM responses are stored under the "text" key
+        if (result.role === "assistant") {
+          const previewData = JSON.parse(result.preview);
+
+          if (previewData[0].text) {
+            preview = previewData[0].text;
+          }
+        }
+      }
+
+      // Generate a context preview with 50 characters before and after the query match
+      if (preview !== "No preview available") {
+        const sanitizedQuery = query.toLowerCase();
+        const lowerPreview = preview.toLowerCase();
+        const matchIndex = lowerPreview.indexOf(sanitizedQuery);
+
+        // Calculate start and end indices for the context window
+        if (matchIndex !== -1) {
+          const startIndex = Math.max(0, matchIndex - 50);
+          const endIndex = Math.min(
+            preview.length,
+            matchIndex + sanitizedQuery.length + 50
+          );
+
+          contextPreview = preview.substring(startIndex, endIndex);
+
+          // Add ellipsis if we're not showing from the beginning or to the end
+          if (startIndex > 0) {
+            contextPreview = "..." + contextPreview;
+          }
+          if (endIndex < preview.length) {
+            contextPreview += "...";
+          }
+          preview = contextPreview;
+        } else {
+          // If for some reason the query isn't found in the preview, fallback to showing the first part
+          preview =
+            preview?.length > 100 ? preview?.slice(0, 100) + "..." : preview;
+        }
+      }
+    } catch (e: any) {
+      preview = "No preview available";
+    }
+
+    return {
+      id: result.id,
+      title: result.title || "Untitled",
+      // TODO: Strip any markdown formatting from the preview
+      preview,
+      createdAt: new Date(result.createdAt),
+      role: result.role,
+      userId: result.userId,
+      visibility: result.visibility,
+    };
+  });
+}
+
+export async function GET(request: Request) {
+  const session = await auth();
+
+  if (!session || !session.user || !session.user.id) {
+    return Response.json("Unauthorized!", { status: 401 });
+  }
+
+  const { searchParams } = new URL(request.url);
+  const query = searchParams.get("q")?.trim?.();
+
+  if (!query) {
+    return Response.json(
+      { error: "Search query is required" },
+      { status: 400 }
+    );
+  }
+
+  const searchResults = await searchChatsByUserId({
+    userId: session.user.id,
+    query,
+  });
+
+  const transformedResults = transformSearchResults(searchResults, query);
+  const groupedResults = groupChatsByDate(transformedResults);
+
+  return Response.json(groupedResults);
+}

components/chat-header.tsx

@@ -12,17 +12,20 @@ import { useSidebar } from './ui/sidebar';
 import { memo } from 'react';
 import { Tooltip, TooltipContent, TooltipTrigger } from './ui/tooltip';
 import { VisibilityType, VisibilitySelector } from './visibility-selector';
+import { Search } from 'lucide-react';
 
 function PureChatHeader({
   chatId,
   selectedModelId,
   selectedVisibilityType,
   isReadonly,
+  setIsSearchOpen,
 }: {
   chatId: string;
   selectedModelId: string;
   selectedVisibilityType: VisibilityType;
   isReadonly: boolean;
+  setIsSearchOpen: (open: boolean) => void;
 }) {
   const router = useRouter();
   const { open } = useSidebar();
@@ -43,6 +46,7 @@ function PureChatHeader({
                 router.push('/');
                 router.refresh();
               }}
+              aria-label="New Chat"
             >
               <PlusIcon />
               <span className="md:sr-only">New Chat</span>
@@ -52,6 +56,24 @@ function PureChatHeader({
         </Tooltip>
       )}
 
+      <Tooltip>
+        <TooltipTrigger asChild>
+          <Button
+            variant="outline"
+            className="order-1 md:px-2 md:h-fit md:ml-0"
+            onClick={() => setIsSearchOpen(true)}
+            aria-label="Search"
+          >
+            <Search />
+          </Button>
+        </TooltipTrigger>
+        <TooltipContent>
+          Search (
+          {navigator?.userAgent?.toLowerCase().includes("mac") ? "⌘" : "Ctrl"} +
+          K)
+        </TooltipContent>
+      </Tooltip>
+
       {!isReadonly && (
         <ModelSelector
           selectedModelId={selectedModelId}