backend/src/services/exaSearch.js

@@ -1,3 +1,5 @@
+const { generateWithFallback } = require('../utils/gemini-fallback');
+
 const DEFAULT_EXA_API_URL = 'https://api.exa.ai/search';
 
 const buildSummary = (results) => {
@@ -20,16 +22,55 @@ const buildSummary = (results) => {
   return snippets.slice(0, 3).join(' ');
 };
 
+const generateFallbackSummary = async (query, numResults) => {
+  try {
+    console.log('🔄 Fallback: Generating AI summary for query:', query);
+    const prompt = `Provide a concise summary of exercise form and technique for: "${query}". Include key points about proper form, common mistakes, and benefits. Keep it to 2-3 sentences.`;
+    
+    const response = await generateWithFallback(prompt, {
+      temperature: 0.7,
+      maxTokens: 256
+    });
+
+    if (response.success && response.data) {
+      console.log(`✅ AI fallback summary generated (provider: ${response.provider})`);
+      // Extract text from the appropriate response format
+      let summaryText = '';
+      if (response.data.response) {
+        summaryText = response.data.response;
+      } else if (response.data.choices?.[0]?.message?.content) {
+        summaryText = response.data.choices[0].message.content;
+      }
+      
+      return {
+        summary: summaryText,
+        results: [], // No source links from AI fallback
+        provider: response.provider
+      };
+    }
+  } catch (err) {
+    console.error('AI fallback summary generation failed:', err.message);
+  }
+
+  // Last resort: simple template
+  return {
+    summary: `Exercise information for ${query}. Consult a fitness professional for proper form and safety guidelines.`,
+    results: [],
+    provider: 'template'
+  };
+};
+
 const searchExerciseResearch = async ({ query, numResults = 5 }) => {
   if (!query || typeof query !== 'string') {
     throw new Error('Query must be a non-empty string');
   }
 
   const apiKey = process.env.EXA_API_KEY;
-  if (!apiKey) {
-    throw new Error('EXA_API_KEY is not configured');
-  }
   
+  // Tier 1: Try Exa API if configured
+  if (apiKey) {
+    try {
+      console.log('📍 Tier 1: Attempting Exa search API...');
       const apiUrl = process.env.EXA_API_URL || DEFAULT_EXA_API_URL;
 
       const response = await fetch(apiUrl, {
@@ -47,8 +88,7 @@ const searchExerciseResearch = async ({ query, numResults = 5 }) => {
       });
 
       if (!response.ok) {
-    const text = await response.text();
+        throw new Error(`Exa search failed: ${response.status}`);
-    throw new Error(`Exa search failed: ${response.status} ${text}`);
       }
 
       const data = await response.json();
@@ -64,12 +104,24 @@ const searchExerciseResearch = async ({ query, numResults = 5 }) => {
         score: result.score
       }));
 
+      console.log('✅ Exa API success');
       return {
         summary: buildSummary(results),
-    results
+        results,
+        provider: 'exa'
       };
+    } catch (err) {
+      console.warn(`⚠️ Exa API failed: ${err.message}, falling back to AI...`);
+    }
+  } else {
+    console.warn('⚠️ EXA_API_KEY not configured, using AI fallback...');
+  }
+
+  // Tier 2: Fallback to AI-generated summary
+  return generateFallbackSummary(query, numResults);
 };
 
 module.exports = {
-  searchExerciseResearch
+  searchExerciseResearch,
+  generateFallbackSummary
 };