Merge pull request #246 from meronogbai/fix/multiple-user-images-in-a…

…-row-gemini-pro

fix: allow multiple user messages in a row for google gemini

src/providers/google/chatComplete.ts

@@ -38,7 +38,10 @@ export const GoogleChatCompleteConfig: ProviderConfig = {
         param: "contents",
         default: "",
         transform: (params: Params) => {
-            const messages = params.messages?.map((message: Message) => {
+            let lastRole: 'user' | 'model' | undefined;
+            const messages: { role: string; parts: { text: string; }[]; }[] = [];
+
+             params.messages?.forEach((message: Message) => {
                 const role = message.role === "assistant" ? "model" : "user";
                 let parts = [];
                 if (typeof message.content === "string") {
@@ -64,7 +67,17 @@ export const GoogleChatCompleteConfig: ProviderConfig = {
                         }
                     });
                 }
-                return { role, parts };
+
+                // @NOTE: This takes care of the "Please ensure that multiturn requests alternate between user and model."
+                // error that occurs when we have multiple user messages in a row.
+                const shouldAppendEmptyModeChat = lastRole === 'user' && role === 'user' && !params.model?.includes('vision');
+
+                if (shouldAppendEmptyModeChat) {
+                  messages.push({ role: 'model', parts: [{ text: '' }] })
+                }
+
+                messages.push({ role, parts });
+                lastRole = role
             });
             return messages;
         },