Knowledge Base: Preview functionality

app/(main)/text-to-speech/page.tsx

@@ -15,8 +15,7 @@ import { useToast } from "@/app/hooks/useToast";
 import { useAuth } from "@/app/lib/context/AuthContext";
 import { useApp } from "@/app/lib/context/AppContext";
 import { apiFetch } from "@/app/lib/apiClient";
-import DatasetsTab from "@/app/components/text-to-speech/DatasetsTab";
-import EvaluationsTab from "@/app/components/text-to-speech/EvaluationsTab";
+import { DatasetsTab, EvaluationsTab } from "@/app/components/text-to-speech";
 import {
   TTSTab,
   TextSample,

app/api/document/[document_id]/preview/route.ts

@@ -0,0 +1,50 @@
+import { NextResponse } from "next/server";
+import { apiClient } from "@/app/lib/apiClient";
+import { DocumentDetailEnvelope } from "@/app/lib/types/document";
+
+export async function GET(
+  request: Request,
+  { params }: { params: Promise<{ document_id: string }> },
+) {
+  const { document_id } = await params;
+  try {
+    const { data } = await apiClient(
+      request,
+      `/api/v1/documents/${document_id}?include_url=true`,
+    );
+    const detail = (data as DocumentDetailEnvelope) || {};
+    const signedUrl = detail.data?.signed_url || detail.signed_url;
+    if (!signedUrl) {
+      return NextResponse.json(
+        { error: "Document has no signed URL" },
+        { status: 404 },
+      );
+    }
+
+    const upstream = await fetch(signedUrl);
+    if (!upstream.ok) {
+      return NextResponse.json(
+        { error: `Failed to fetch document (status ${upstream.status})` },
+        { status: upstream.status },
+      );
+    }
+
+    const contentType =
+      upstream.headers.get("Content-Type") || "application/octet-stream";
+    return new Response(upstream.body, {
+      status: 200,
+      headers: {
+        "Content-Type": contentType,
+        "Cache-Control": "private, max-age=300",
+      },
+    });
+  } catch (error: unknown) {
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : String(error),
+      },
+      { status: 500 },
+    );
+  }
+}

app/components/analytics/BreakdownPanel.tsx

@@ -138,7 +138,7 @@ export default function BreakdownPanel({
             {groupHeader}-wise {metricLabel}
           </h4>
         </header>
-        <div className="flex-1 min-h-0 max-h-80 overflow-y-auto custom-scroll-accent">
+        <div className="flex-1 min-h-0 max-h-80 overflow-y-auto">
           <table className="w-full text-sm">
             <thead className="sticky top-0 bg-accent-primary/10 backdrop-blur-3xl">
               <tr className="text-[11px] uppercase tracking-wide text-black">

app/components/evaluations/DatasetsTab.tsx

@@ -8,6 +8,7 @@ import { DatabaseIcon, PlusIcon } from "@/app/components/icons";
 import { Button, Modal } from "@/app/components/ui";
 import { useToast } from "@/app/hooks/useToast";
 import { DatasetListSkeleton } from "@/app/components";
+import { parseCsvRow } from "@/app/lib/utils/csv";
 import DatasetCard from "./DatasetCard";
 import CreateDatasetForm from "./CreateDatasetForm";
 import ViewDatasetModal from "./ViewDatasetModal";
@@ -34,29 +35,6 @@ export interface DatasetsTabProps {
   toast: ReturnType<typeof useToast>;
 }
 
-const parseCsvRow = (line: string): string[] => {
-  const result: string[] = [];
-  let current = "";
-  let inQuotes = false;
-  for (let i = 0; i < line.length; i++) {
-    if (line[i] === '"') {
-      if (inQuotes && line[i + 1] === '"') {
-        current += '"';
-        i++;
-      } else {
-        inQuotes = !inQuotes;
-      }
-    } else if (line[i] === "," && !inQuotes) {
-      result.push(current.trim());
-      current = "";
-    } else {
-      current += line[i];
-    }
-  }
-  result.push(current.trim());
-  return result;
-};
-
 export default function DatasetsTab({
   leftPanelWidth,
   datasetName,

app/components/knowledge-base/CollectionDetail.tsx

@@ -125,7 +125,7 @@ export default function CollectionDetail({
           </h3>
           {documents.length > 0 && (
             <Button
-              variant="outline"
+              variant="primary"
               size="sm"
               onClick={() => onPreviewDocument(documents[0])}
             >

app/components/knowledge-base/CsvPreview.tsx

@@ -0,0 +1,101 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { Loader } from "@/app/components/ui";
+import { useAuth } from "@/app/lib/context/AuthContext";
+import { apiFetchResponse } from "@/app/lib/apiClient";
+import { ParsedCsv, parseCsv } from "@/app/lib/utils/csv";
+import { CsvPreviewProps } from "@/app/lib/types/document";
+
+export default function CsvPreview({ url }: CsvPreviewProps) {
+  const { activeKey } = useAuth();
+  const apiKey = activeKey?.key ?? "";
+  const [data, setData] = useState<ParsedCsv | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    setError(null);
+    setData(null);
+    apiFetchResponse(url, apiKey)
+      .then((r) => {
+        if (!r.ok) throw new Error(`Server returned ${r.status}`);
+        return r.text();
+      })
+      .then((text) => {
+        if (!cancelled) setData(parseCsv(text));
+      })
+      .catch((e: Error) => {
+        if (!cancelled) setError(e.message || "Couldn't load CSV");
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [url, apiKey]);
+
+  if (loading) {
+    return (
+      <div className="flex items-center justify-center h-full">
+        <Loader size="md" message="Loading CSV…" />
+      </div>
+    );
+  }
+  if (error) {
+    return (
+      <div className="flex flex-col items-center justify-center h-full gap-2 px-6 text-center">
+        <p className="text-sm text-text-secondary">
+          Couldn&apos;t load CSV preview.
+        </p>
+        <p className="text-xs text-text-secondary">{error}</p>
+      </div>
+    );
+  }
+  if (!data || data.headers.length === 0) {
+    return (
+      <div className="flex items-center justify-center h-full">
+        <p className="text-sm text-text-secondary">CSV is empty.</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="h-full overflow-auto bg-bg-primary">
+      <table className="w-full text-sm border-collapse">
+        <thead className="sticky top-0 z-10 bg-bg-secondary border-b border-border">
+          <tr>
+            {data.headers.map((h, i) => (
+              <th
+                key={i}
+                className="text-left px-3 py-2 font-semibold text-text-primary border-r border-border last:border-r-0 whitespace-nowrap"
+              >
+                {h || `Column ${i + 1}`}
+              </th>
+            ))}
+          </tr>
+        </thead>
+        <tbody>
+          {data.rows.map((row, ri) => (
+            <tr
+              key={ri}
+              className="border-b border-border last:border-b-0 hover:bg-bg-secondary/40"
+            >
+              {data.headers.map((_, ci) => (
+                <td
+                  key={ci}
+                  className="px-3 py-2 text-text-secondary border-r border-border last:border-r-0 align-top"
+                >
+                  {row[ci] ?? ""}
+                </td>
+              ))}
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+}