fix: enhance prompt "Invalid or missing provider" bad request error

app/lib/hooks/usePromptEnhancer.ts

@@ -1,4 +1,5 @@
 import { useState } from 'react';
+import type { ProviderInfo } from '~/types/model';
 import { createScopedLogger } from '~/utils/logger';
 
 const logger = createScopedLogger('usePromptEnhancement');
@@ -13,54 +14,54 @@ export function usePromptEnhancer() {
   };
 
   const enhancePrompt = async (
-    input: string, 
+    input: string,
     setInput: (value: string) => void,
     model: string,
-    provider: string,
-    apiKeys?: Record<string, string>
+    provider: ProviderInfo,
+    apiKeys?: Record<string, string>,
   ) => {
     setEnhancingPrompt(true);
     setPromptEnhanced(false);
-  
+
     const requestBody: any = {
       message: input,
       model,
       provider,
     };
-  
+
     if (apiKeys) {
       requestBody.apiKeys = apiKeys;
     }
-  
+
     const response = await fetch('/api/enhancer', {
       method: 'POST',
       body: JSON.stringify(requestBody),
     });
-  
+
     const reader = response.body?.getReader();
-  
+
     const originalInput = input;
-  
+
     if (reader) {
       const decoder = new TextDecoder();
-  
+
       let _input = '';
       let _error;
-  
+
       try {
         setInput('');
-  
+
         while (true) {
           const { value, done } = await reader.read();
-  
+
           if (done) {
             break;
           }
-  
+
           _input += decoder.decode(value);
-  
+
           logger.trace('Set input', _input);
-  
+
           setInput(_input);
         }
       } catch (error) {
@@ -70,10 +71,10 @@ export function usePromptEnhancer() {
         if (_error) {
           logger.error(_error);
         }
-  
+
         setEnhancingPrompt(false);
         setPromptEnhanced(true);
-  
+
         setTimeout(() => {
           setInput(_input);
         });

app/routes/api.enhancer.ts

@@ -2,7 +2,7 @@ import { type ActionFunctionArgs } from '@remix-run/cloudflare';
 import { StreamingTextResponse, parseStreamPart } from 'ai';
 import { streamText } from '~/lib/.server/llm/stream-text';
 import { stripIndents } from '~/utils/stripIndent';
-import type { StreamingOptions } from '~/lib/.server/llm/stream-text';
+import type { ProviderInfo } from '~/types/model';
 
 const encoder = new TextEncoder();
 const decoder = new TextDecoder();
@@ -12,25 +12,27 @@ export async function action(args: ActionFunctionArgs) {
 }
 
 async function enhancerAction({ context, request }: ActionFunctionArgs) {
-  const { message, model, provider, apiKeys } = await request.json<{ 
+  const { message, model, provider, apiKeys } = await request.json<{
     message: string;
     model: string;
-    provider: string;
+    provider: ProviderInfo;
     apiKeys?: Record<string, string>;
   }>();
 
-  // Validate 'model' and 'provider' fields
+  const { name: providerName } = provider;
+
+  // validate 'model' and 'provider' fields
   if (!model || typeof model !== 'string') {
     throw new Response('Invalid or missing model', {
       status: 400,
-      statusText: 'Bad Request'
+      statusText: 'Bad Request',
     });
   }
 
-  if (!provider || typeof provider !== 'string') {
+  if (!providerName || typeof providerName !== 'string') {
     throw new Response('Invalid or missing provider', {
       status: 400,
-      statusText: 'Bad Request'
+      statusText: 'Bad Request',
     });
   }
 
@@ -39,7 +41,9 @@ async function enhancerAction({ context, request }: ActionFunctionArgs) {
       [
         {
           role: 'user',
-          content: `[Model: ${model}]\n\n[Provider: ${provider}]\n\n` + stripIndents`
+          content:
+            `[Model: ${model}]\n\n[Provider: ${providerName}]\n\n` +
+            stripIndents`
           I want you to improve the user prompt that is wrapped in \`<original_prompt>\` tags.
 
           IMPORTANT: Only respond with the improved prompt and nothing else!
@@ -52,23 +56,24 @@ async function enhancerAction({ context, request }: ActionFunctionArgs) {
       ],
       context.cloudflare.env,
       undefined,
-      apiKeys
+      apiKeys,
     );
 
     const transformStream = new TransformStream({
       transform(chunk, controller) {
         const text = decoder.decode(chunk);
-        const lines = text.split('\n').filter(line => line.trim() !== '');
-        
+        const lines = text.split('\n').filter((line) => line.trim() !== '');
+
         for (const line of lines) {
           try {
             const parsed = parseStreamPart(line);
+
             if (parsed.type === 'text') {
               controller.enqueue(encoder.encode(parsed.value));
             }
           } catch (e) {
-            // Skip invalid JSON lines
-            console.warn('Failed to parse stream part:', line);
+            // skip invalid JSON lines
+            console.warn('Failed to parse stream part:', line, e);
           }
         }
       },
@@ -83,7 +88,7 @@ async function enhancerAction({ context, request }: ActionFunctionArgs) {
     if (error instanceof Error && error.message?.includes('API key')) {
       throw new Response('Invalid or missing API key', {
         status: 401,
-        statusText: 'Unauthorized'
+        statusText: 'Unauthorized',
       });
     }