Add tool usage and fix messaging history

lib/ai/tools.js

@@ -0,0 +1,186 @@
+// AI Tool definitions for function calling
+import Searcher from '../search/search.js';
+
+// Initialize search instance
+const searchFields = ["filename", "category", "type", "region"];
+const searcher = new Searcher(searchFields);
+
+// Default search settings
+const defaultSearchSettings = {
+  boost: {
+    filename: 2,
+    category: 1,
+    type: 1,
+    region: 1
+  },
+  combineWith: "AND",
+  fields: searchFields,
+  fuzzy: 0,
+  prefix: true,
+  hideNonGame: true,
+  useOldResults: false,
+  pageSize: 10,
+  page: 0,
+  sort: ""
+};
+
+/**
+ * Available tools for the AI assistant
+ */
+export const tools = [
+  {
+    type: "function",
+    function: {
+      name: "search_games",
+      description: "Search for retro games and ROMs in the Myrient database. Use simple, flexible text searches for best results. The search is fuzzy and will find partial matches.",
+      parameters: {
+        type: "object",
+        properties: {
+          query: {
+            type: "string",
+            description: "The search query - game name or title. Examples: 'Super Mario', 'The Last of Us', 'Final Fantasy'. Keep it simple for best results."
+          },
+          limit: {
+            type: "number",
+            description: "Maximum number of results to return (1-50, default 10)",
+            minimum: 1,
+            maximum: 50
+          }
+        },
+        required: ["query"]
+      }
+    }
+  },
+  {
+    type: "function",
+    function: {
+      name: "get_search_suggestions",
+      description: "Get search suggestions based on a partial query. Useful for helping users discover games or correct typos.",
+      parameters: {
+        type: "object",
+        properties: {
+          query: {
+            type: "string",
+            description: "Partial search query to get suggestions for"
+          }
+        },
+        required: ["query"]
+      }
+    }
+  }
+];
+
+/**
+ * Execute a tool call
+ */
+export async function executeToolCall(toolCall) {
+  const { name, arguments: argsString } = toolCall.function;
+
+  try {
+    // Parse arguments from JSON string
+    let args;
+    try {
+      args = typeof argsString === 'string' ? JSON.parse(argsString) : argsString;
+    } catch (parseError) {
+      throw new Error(`Invalid JSON arguments for ${name}: ${parseError.message}`);
+    }
+
+    switch (name) {
+      case 'search_games':
+        return await searchGames(args);
+      case 'get_search_suggestions':
+        return await getSearchSuggestions(args);
+      default:
+        throw new Error(`Unknown tool: ${name}`);
+    }
+  } catch (error) {
+    console.error(`Tool execution error for ${name}:`, error);
+    return {
+      error: `Failed to execute ${name}: ${error.message}`
+    };
+  }
+}
+
+/**
+ * Search for games using the existing search infrastructure
+ */
+async function searchGames(args) {
+  const { query, limit = 10 } = args;
+
+  if (!query || typeof query !== 'string') {
+    throw new Error('Query is required and must be a string');
+  }
+
+  // Build search options - simplified for fuzzy/flexible search
+  const searchOptions = { ...defaultSearchSettings };
+  searchOptions.pageSize = Math.min(Math.max(1, limit), 50);
+
+  // Enable fuzzy search for better matching
+  searchOptions.fuzzy = 1; // Allow some typos/variations
+  searchOptions.prefix = true; // Allow partial matches
+
+  try {
+    const results = await searcher.findAllMatches(query.trim(), searchOptions);
+
+    // Use results as-is without strict filtering
+    let filteredItems = results.items;
+
+    // Format results for the AI
+    const formattedResults = filteredItems.slice(0, searchOptions.pageSize).map(item => ({
+      id: item.file.id,
+      filename: item.file.filename,
+      category: item.file.category,
+      type: item.file.type,
+      region: item.file.region,
+      size: item.file.size,
+      score: item.score,
+      // Add URLs for linking to games
+      urls: {
+        info: `/info/${item.file.id}`,
+        play: `/play/${item.file.id}`, // For emulator (if compatible)
+        download: item.file.path // Direct download link
+      },
+      metadata: item.metadata ? {
+        title: item.metadata.title,
+        description: item.metadata.summary,
+        releaseDate: item.metadata.first_release_date,
+        rating: item.metadata.rating,
+        genres: item.metadata.genres
+      } : null
+    }));
+
+    return {
+      query,
+      results: formattedResults,
+      total_found: results.count,
+      total_returned: formattedResults.length,
+      search_time: results.elapsed
+    };
+
+  } catch (error) {
+    throw new Error(`Search failed: ${error.message}`);
+  }
+}
+
+/**
+ * Get search suggestions
+ */
+async function getSearchSuggestions(args) {
+  const { query } = args;
+
+  if (!query || typeof query !== 'string') {
+    throw new Error('Query is required and must be a string');
+  }
+
+  try {
+    const suggestions = await searcher.getSuggestions(query.trim(), defaultSearchSettings);
+
+    return {
+      query,
+      suggestions: suggestions || []
+    };
+
+  } catch (error) {
+    throw new Error(`Failed to get suggestions: ${error.message}`);
+  }
+}