chore: log image input counts for failover

app/(chat)/api/chat/_lib/image-failover.ts

@@ -214,15 +214,25 @@ function messagePartHasImageInput(part: any) {
   return false;
 }
 
+function countImageInputPartsInMessage(message: any) {
+  const countParts = (parts: any[] | undefined) =>
+    Array.isArray(parts) ? parts.filter(messagePartHasImageInput).length : 0;
+
+  const contentCount = countParts(Array.isArray(message?.content) ? message.content : undefined);
+  if (contentCount > 0) return contentCount;
+
+  return countParts(Array.isArray(message?.parts) ? message.parts : undefined);
+}
+
+export function countChatMessageImageInputs(messages: ChatMessage[]) {
+  return messages.reduce(
+    (count, message) => count + countImageInputPartsInMessage(message),
+    0
+  );
+}
+
 export function chatMessagesHaveImageInput(messages: ChatMessage[]) {
-  return messages.some((message: any) => {
-    const content = message?.content;
-    if (Array.isArray(content) && content.some(messagePartHasImageInput)) {
-      return true;
-    }
-    const parts = message?.parts;
-    return Array.isArray(parts) && parts.some(messagePartHasImageInput);
-  });
+  return countChatMessageImageInputs(messages) > 0;
 }
 
 export function getImageFailoverConvertProvider(providerType?: string | null) {
@@ -384,13 +394,16 @@ export async function generateImageWithFailoverCandidate(params: {
     getImageFailoverConvertProvider(providerType)
   );
   const effectiveImageParams = imageParams || fallbackImageParams;
+  const imageInputCount = countChatMessageImageInputs(messages);
   chatApiLogger.info("[Chat API] Image failover candidate params:", {
     model: candidate.model?.modelId || candidate.model?.id,
     providerType,
     aspectRatio: effectiveImageParams?.aspectRatio,
     imageSize: effectiveImageParams?.imageSize,
     imageCount: effectiveImageParams?.imageCount,
-    hasImageInput: chatMessagesHaveImageInput(messages),
+    hasImageInput: imageInputCount > 0,
+    imageInputCount,
+    multiImageInput: imageInputCount > 1,
   });
   const candidateResult = await (candidateLanguageModel as any).doGenerate({
     messages: candidateMessages,

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

@@ -9373,7 +9373,9 @@ export async function POST(request: Request) {
               );
               chatApiLogger.info("[Chat API] Image provider target images:", {
                 resolutionMode: requestTargetResolution?.resolutionMode || null,
+                targetImageCount: resolvedTargetImageUrlsForProvider.length,
                 imageCount: resolvedTargetImageUrlsForProvider.length,
+                multiImageTarget: resolvedTargetImageUrlsForProvider.length > 1,
                 firstImageUrl: summarizeTargetImageUrl(resolvedTargetImageUrlsForProvider[0]),
               });
             }

lib/ai/providers/snapgen-image.ts

@@ -901,6 +901,13 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
           resolutionParam,
           imageCount,
           referenceImageCount: imageUrls.length,
+          multiImageReference: imageUrls.length > 1,
+          referenceTransport:
+            imageUrls.length === 0
+              ? "none"
+              : apiFormat === "snapgen-generic-image"
+                ? "file_urls"
+                : "files",
         });
 
         const createPayload = await requestSnapgenMultipart({