Replace keyword detection with proper tool calling for web search

- Define web_search function that AI can call when needed
- AI decides autonomously when to search (no keyword matching)
- Tool calling via NanoGPT API with function definitions
- Format search results with sources for citations

utils/ai.js

@@ -1,4 +1,4 @@
-// ai.js - NanoGPT API wrapper for kekbot with fallback and web search support
+// ai.js - NanoGPT API wrapper for kekbot with fallback and web search tools
 // Copyright (C) 2025  Luis Bauza
 
 import axios from 'axios';
@@ -7,12 +7,24 @@ const DEFAULT_MODEL = 'GLM-4.5-Air-Derestricted';
 const FALLBACK_MODEL = 'GLM-4.7-Flash';
 const FALLBACK_API_URL = 'https://api.z.ai/api/coding/paas/v4/chat/completions';
 
-// Keywords that suggest the user wants current/web information
-const WEB_SEARCH_TRIGGERS = [
-  'latest', 'news', 'current', 'today', 'yesterday', 'this week',
-  'what is the', 'who is', 'what happened', 'search', 'find',
-  'how do i', 'how to', 'what\'s the best', 'top ', '2024', '2025', '2026'
-];
+// Tool definitions for function calling
+const WEB_SEARCH_TOOL = {
+  type: 'function',
+  function: {
+    name: 'web_search',
+    description: 'Search the web for current information. Use this when you need up-to-date facts, news, or information that may have changed recently.',
+    parameters: {
+      type: 'object',
+      properties: {
+        query: {
+          type: 'string',
+          description: 'The search query to find relevant web results.'
+        }
+      },
+      required: ['query']
+    }
+  }
+};
 
 const SASSY_SYSTEM_PROMPT = `You are kekbot, a sassy Discord chatter with a big personality.
 
@@ -26,7 +38,7 @@ CORE PERSONALITY:
 
 OPINIONS:
 - You're a true gamer with strong opinions about games
-- You hate League of Legends and Riot Games with a passion - - but only bring it up when asked
+- You hate League of Legends and Riot Games with a passion - but only bring it up when asked
 - When asked about other games, respond normally without mentioning LoL
 - You have views on politics and aren't afraid to share them from a Democrat/Libertarian perspective
 
@@ -43,6 +55,7 @@ RESPONSE RULES:
 - Don't use markdown formatting excessively - plain text with personality
 - You can disagree with the user, you're not a yes-man
 - Stay in character always
+- Use the web_search tool when you need current information
 
 CONTEXT: You're chatting in a Discord server. Multiple people might be talking. Pay attention to who you're responding to.`;
 
@@ -50,11 +63,6 @@ CONTEXT: You're chatting in a Discord server. Multiple people might be talking.
 const conversationHistory = new Map();
 const MAX_HISTORY_PER_CHANNEL = 10;
 
-function shouldUseWebSearch(prompt) {
-  const lowerPrompt = prompt.toLowerCase();
-  return WEB_SEARCH_TRIGGERS.some(trigger => lowerPrompt.includes(trigger));
-}
-
 function buildMessages(history, prompt, mentionedUsername, systemPrompt) {
   const messages = [
     { role: 'system', content: systemPrompt },
@@ -69,17 +77,101 @@ function buildMessages(history, prompt, mentionedUsername, systemPrompt) {
   return messages;
 }
 
-function getModelWithSearch(model) {
-  return `${model}:online`;
+async function performWebSearch(query) {
+  const response = await axios.post(
+    'https://nano-gpt.com/api/web',
+    {
+      query: query,
+      provider: 'linkup',
+      depth: 'standard',
+      outputType: 'sourcedAnswer'
+    },
+    {
+      headers: {
+        Authorization: `Bearer ${process.env.NANOGPT_API_KEY}`,
+        'Content-Type': 'application/json',
+      },
+      timeout: 60000,
+    }
+  );
+  
+  const data = response.data.data;
+  const metadata = response.data.metadata;
+  
+  // Format the response nicely
+  let formattedResult = '';
+  
+  if (typeof data === 'string') {
+    formattedResult = data;
+  } else if (data.answer) {
+    formattedResult = data.answer;
+    if (data.sources && data.sources.length > 0) {
+      formattedResult += '\n\nSources:\n';
+      data.sources.forEach((source, i) => {
+        formattedResult += `${i + 1}. ${source.name || source.url}\n`;
+      });
+    }
+  } else if (data.results) {
+    formattedResult = 'Search results:\n';
+    data.results.slice(0, 5).forEach((result, i) => {
+      formattedResult += `${i + 1}. ${result.title || result.name}\n`;
+      if (result.url) formattedResult += `   ${result.url}\n`;
+      if (result.content) formattedResult += `   ${result.content.substring(0, 200)}...\n`;
+    });
   }
   
-async function callNanoGPT(messages, model, useWebSearch = false) {
-  const modelToUse = useWebSearch ? getModelWithSearch(model) : model;
+  return formattedResult;
+}
 
+async function callNanoGPTWithTools(messages, model, maxRetries = 2) {
+  let lastError;
+  
+  for (let attempt = 0; attempt <= maxRetries; attempt++) {
+    try {
       const response = await axios.post(
         'https://nano-gpt.com/api/v1/chat/completions',
         {
-      model: modelToUse,
+          model: model,
+          messages: messages,
+          tools: [WEB_SEARCH_TOOL],
+          temperature: 0.8,
+          max_tokens: 800,
+        },
+        {
+          headers: {
+            Authorization: `Bearer ${process.env.NANOGPT_API_KEY}`,
+            'Content-Type': 'application/json',
+          },
+          timeout: 90000,
+        }
+      );
+      
+      const choice = response.data.choices[0];
+      const message = choice.message;
+      
+      // Check if AI wants to call a tool
+      if (message.tool_calls && message.tool_calls.length > 0) {
+        for (const toolCall of message.tool_calls) {
+          if (toolCall.function.name === 'web_search') {
+            const args = JSON.parse(toolCall.function.arguments);
+            console.log('AI requested web search for:', args.query);
+            
+            // Perform the search
+            const searchResult = await performWebSearch(args.query);
+            
+            // Add tool result to messages and continue
+            messages.push(message);
+            messages.push({
+              role: 'tool',
+              tool_call_id: toolCall.id,
+              content: searchResult
+            });
+            
+            // Get final response with search results
+            const finalResponse = await axios.post(
+              'https://nano-gpt.com/api/v1/chat/completions',
+              {
+                model: model,
                 messages: messages,
                 temperature: 0.8,
                 max_tokens: 800,
@@ -89,10 +181,28 @@ async function callNanoGPT(messages, model, useWebSearch = false) {
                   Authorization: `Bearer ${process.env.NANOGPT_API_KEY}`,
                   'Content-Type': 'application/json',
                 },
-      timeout: 90000, // Longer timeout for web search
+                timeout: 90000,
               }
             );
-  return response.data.choices[0].message.content;
+            
+            return finalResponse.data.choices[0].message.content;
+          }
+        }
+      }
+      
+      // No tool calls, return direct response
+      return message.content;
+      
+    } catch (error) {
+      lastError = error;
+      console.error(`NanoGPT attempt ${attempt + 1} failed:`, error.message);
+      
+      if (attempt < maxRetries) {
+        await new Promise(resolve => setTimeout(resolve, 1000 * (attempt + 1)));
+      }
+    }
+  }
+  throw lastError;
 }
 
 async function callFallbackAPI(messages) {
@@ -115,51 +225,16 @@ async function callFallbackAPI(messages) {
   return response.data.choices[0].message.content;
 }
 
-async function callNanoGPTWithRetry(messages, model, useWebSearch = false, maxRetries = 2) {
-  let lastError;
-  
-  for (let attempt = 0; attempt <= maxRetries; attempt++) {
-    try {
-      return await callNanoGPT(messages, model, useWebSearch);
-    } catch (error) {
-      lastError = error;
-      console.error(`NanoGPT attempt ${attempt + 1} failed:`, error.message);
-      
-      // If it's a web search failure, try without web search
-      if (useWebSearch && attempt === 0) {
-        console.log('Web search failed, retrying without...');
-        try {
-          return await callNanoGPT(messages, model, false);
-        } catch (retryError) {
-          console.error('Retry without web search also failed:', retryError.message);
-        }
-      }
-      
-      // Wait before retry (exponential backoff)
-      if (attempt < maxRetries) {
-        await new Promise(resolve => setTimeout(resolve, 1000 * (attempt + 1)));
-      }
-    }
-  }
-  throw lastError;
-}
-
 export async function getAIResponse(prompt, channelId, mentionedUsername) {
   const history = conversationHistory.get(channelId) || [];
   const messages = buildMessages(history, prompt, mentionedUsername, SASSY_SYSTEM_PROMPT);
   const model = process.env.NANO_MODEL || DEFAULT_MODEL;
 
-  // Determine if we should use web search
-  const useWebSearch = shouldUseWebSearch(prompt);
-  if (useWebSearch) {
-    console.log('Web search enabled for query:', prompt.substring(0, 50));
-  }
-
-  // Try NanoGPT first
+  // Try NanoGPT first (with tool calling)
   if (process.env.NANOGPT_API_KEY) {
     try {
-      console.log(useWebSearch ? 'Attempting NanoGPT with web search...' : 'Attempting NanoGPT...');
-      const aiResponse = await callNanoGPTWithRetry(messages, model, useWebSearch);
+      console.log('Attempting NanoGPT with tool calling...');
+      const aiResponse = await callNanoGPTWithTools(messages, model);
       
       // Update history on success
       const newHistory = [