feat: Add CSV download functionality for filtered dataset entries

src/lib/download-utils.ts

@@ -44,3 +44,42 @@ export async function downloadFilteredEntriesAsZip(
     throw error;
   }
 }
+
+export async function downloadFilteredEntriesAsCsv(
+  datasetId: number,
+  filters: FilterParams
+) {
+  try {
+    const response = await fetch('/api/download-metadata-csv', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        datasetId,
+        filters,
+      }),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.error || 'Failed to download CSV');
+    }
+
+    // Get the CSV blob from response
+    const blob = await response.blob();
+
+    // Trigger download
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = `dataset-${datasetId}-metadata-${new Date().toISOString().split('T')[0]}.csv`;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  } catch (error) {
+    console.error('Error downloading CSV:', error);
+    throw error;
+  }
+}