Function Calling

import Anthropic from "@anthropic-ai/sdk";
import GboxSDK from "gbox-sdk";
import * as dotenv from "dotenv";

dotenv.config();

// ==================== Initialize Clients ====================
const gboxSDK = new GboxSDK({
  apiKey: process.env["GBOX_API_KEY"],
});

const anthropicClient = new Anthropic({
  apiKey: process.env["ANTHROPIC_API_KEY"],
});

// ==================== Type Definitions ====================
interface ToolExecutionResult {
  success: boolean;
  result: string;
}

// ==================== Configuration Constants ====================
const DEFAULT_QUESTION =
  "Please calculate the first 20 terms of the Fibonacci sequence and create a simple chart to visualize the growth trend";

// ==================== Utility Functions ====================

/**
 * Get user question from command line arguments or use default
 */
function getUserQuestion(): string {
  const args = process.argv.slice(2);

  if (args.length > 0) {
    const userQuestion = args.join(" ").trim();
    if (userQuestion) {
      console.info(`📝 Using user question: "${userQuestion}"`);
      return userQuestion;
    }
  }

  console.info(`📝 Using default question: "${DEFAULT_QUESTION}"`);
  return DEFAULT_QUESTION;
}

/**
 * Create initial conversation messages
 */
const createInitialMessages = (question: string): Anthropic.MessageParam[] => [
  {
    role: "user",
    content: question,
  },
];

/**
 * Define available functions for function calling
 */
const createTools = (): Anthropic.Tool[] => [
  {
    name: "execute_python",
    description:
      "Execute Python code in a Linux environment and return results from stdout/stderr streams",
    input_schema: {
      type: "object",
      properties: {
        code: {
          type: "string",
          description:
            "The Python code to execute. Results will be captured from standard output and standard error streams.",
        },
      },
      required: ["code"],
    },
  },
];

// ==================== Core Execution Functions ====================

/**
 * Execute Python code using Gbox
 */
async function executePythonCode(code: string): Promise<ToolExecutionResult> {
  const box = await gboxSDK.create({ type: "linux" });

  try {
    console.info("📝 Executing Python code:");
    console.log(code);
    console.info("─".repeat(50));

    const execution = await box.runCode(code);
    const result = execution.stdout || execution.stderr || "No output";

    console.info("✅ Execution result:");
    console.log(result);
    console.info("─".repeat(50));

    return {
      success: true,
      result,
    };
  } catch (error) {
    const errorMessage = `Error: ${error}`;
    console.error("❌ Execution failed:", errorMessage);

    return {
      success: false,
      result: errorMessage,
    };
  } finally {
    await box.terminate();
  }
}

/**
 * Process function calls from Anthropic response
 */
async function processToolUse(
  toolUseBlocks: Anthropic.ToolUseBlock[],
  messages: Anthropic.MessageParam[]
): Promise<void> {
  for (const toolUse of toolUseBlocks) {
    if (toolUse.name === "execute_python") {
      try {
        const { code } = toolUse.input as { code: string };
        const executionResult = await executePythonCode(code);

        // Add function result to conversation
        messages.push({
          role: "user",
          content: [
            {
              type: "tool_result",
              tool_use_id: toolUse.id,
              content: executionResult.result,
            },
          ],
        });
      } catch (parseError) {
        console.error("❌ Failed to parse function arguments:", parseError);

        messages.push({
          role: "user",
          content: [
            {
              type: "tool_result",
              tool_use_id: toolUse.id,
              content: `Error parsing arguments: ${parseError}`,
            },
          ],
        });
      }
    }
  }
}

/**
 * Generate Anthropic message
 */
async function generateMessage(
  messages: Anthropic.MessageParam[],
  tools?: Anthropic.Tool[]
): Promise<Anthropic.Message> {
  const response = await anthropicClient.messages.create({
    model: "claude-3-5-sonnet-20241022",
    max_tokens: 4000,
    messages,
    ...(tools && { tools }),
  });

  return response;
}

// ==================== Main Execution Flow ====================

/**
 * Main function - orchestrates the entire execution flow
 */
async function main(): Promise<void> {
  try {
    console.info("🚀 Starting Anthropic + Gbox integration");
    console.info("═".repeat(50));

    const userQuestion = getUserQuestion();
    const messages = createInitialMessages(userQuestion);
    const tools = createTools();

    // Get initial response from Anthropic
    console.info("💬 Getting initial response from Anthropic...");
    const initialResponse = await generateMessage(messages, tools);

    // Add assistant message to conversation
    messages.push({
      role: "assistant",
      content: initialResponse.content,
    });

    // Check if there are function call blocks
    const toolUseBlocks = initialResponse.content.filter(
      (block): block is Anthropic.ToolUseBlock => block.type === "tool_use"
    );

    if (toolUseBlocks.length > 0) {
      console.info(`🔧 Processing ${toolUseBlocks.length} function call(s)...`);
      await processToolUse(toolUseBlocks, messages);

      // Generate final response after function execution
      console.info("💬 Getting final response from Anthropic...");
      const finalResponse = await generateMessage(messages);

      console.info("🎉 Final response:");
      console.info("═".repeat(50));

      for (const content of finalResponse.content) {
        if (content.type === "text") {
          console.log(content.text);
        }
      }
    } else {
      console.info("🎉 Response (no functions called):");
      console.info("═".repeat(50));

      for (const content of initialResponse.content) {
        if (content.type === "text") {
          console.log(content.text);
        }
      }
    }
  } catch (error) {
    console.error("💥 Application error:", error);
    process.exit(1);
  }
}

// ==================== Help Information ====================

/**
 * Display usage instructions
 */
if (process.argv.includes("--help") || process.argv.includes("-h")) {
  console.log(`
🤖 Anthropic Claude + Gbox Cloud Integration Tool

Usage:
  npx tsx index.ts [question]

Examples:
  npx tsx index.ts
  # Uses default question: "${DEFAULT_QUESTION}"

  npx tsx index.ts "Write a Python function to sort a list"
  # Uses custom question

  npx tsx index.ts "Calculate prime numbers"
  # Works with any natural language question

Options:
  --help, -h    Show this help message
    `);
  process.exit(0);
}

// Launch the application
main();