feat: Add layer-wise texture editing using Gemini AI

src/lib/api/apiUtils.ts

@@ -79,3 +79,33 @@ export async function pollStatus<T>(
 
   throw new Error("Polling timeout exceeded.");
 }
+
+export async function editUVLayer(prompt: string, imageBase64: string, token: string): Promise<string> {
+  // Extract mime type if present in the data URI
+  let mimeType = 'image/png';
+  if (imageBase64.startsWith('data:')) {
+    const match = imageBase64.match(/^data:([^;]+);/);
+    if (match) {
+      mimeType = match[1];
+    }
+  }
+
+  const response = await fetch('/api/sparkplug/edit-layer', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'Authorization': `Bearer ${token}`
+    },
+    body: JSON.stringify({ prompt, imageBase64, mimeType })
+  });
+
+  if (!response.ok) {
+    const errorData = await response.json().catch(() => ({}));
+    throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
+  }
+
+  const data = await response.json();
+  if (data.error) throw new Error(data.error);
+  
+  return data.imageUrl;
+}