#!/usr/bin/env node

/**
 * Apollo.io MCP Server - Entry Point
 * Provides AI-powered access to Apollo.io sales intelligence platform
 */

import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import { ApolloMCPServer } from './server.js';
import { ApolloClient } from './client/apollo-client.js';

// Environment validation
const apiKey = process.env.APOLLO_API_KEY;

if (!apiKey) {
  console.error('❌ APOLLO_API_KEY environment variable is required');
  console.error('');
  console.error('Get your API key from:');
  console.error('  1. Log in to Apollo.io');
  console.error('  2. Go to Settings > Integrations > API');
  console.error('  3. Generate or copy your API key');
  console.error('');
  console.error('Then set it:');
  console.error('  export APOLLO_API_KEY="your-api-key-here"');
  console.error('');
  process.exit(1);
}

// Create Apollo API client
const apolloClient = new ApolloClient({
  apiKey,
  baseUrl: process.env.APOLLO_BASE_URL,
});

// Create MCP server
const server = new Server(
  {
    name: 'apollo-mcp-server',
    version: '1.0.0',
  },
  {
    capabilities: {
      tools: {},
    },
  }
);

// Initialize Apollo MCP server with tool handlers
const apolloServer = new ApolloMCPServer(server, apolloClient);
await apolloServer.setupHandlers();

// Graceful shutdown handler
let isShuttingDown = false;
const shutdown = async (signal: string) => {
  if (isShuttingDown) return;
  isShuttingDown = true;

  console.error(`\n📡 Received ${signal}, shutting down gracefully...`);
  
  try {
    await server.close();
    console.error('✅ Server closed successfully');
    process.exit(0);
  } catch (error) {
    console.error('❌ Error during shutdown:', error);
    process.exit(1);
  }
};

process.on('SIGINT', () => shutdown('SIGINT'));
process.on('SIGTERM', () => shutdown('SIGTERM'));

// Health check support
process.on('message', (msg: any) => {
  if (msg === 'health_check') {
    process.send?.({ status: 'healthy', server: 'apollo-mcp' });
  }
});

// Start server with stdio transport
const transport = new StdioServerTransport();
await server.connect(transport);

console.error('🚀 Apollo MCP Server running on stdio');
console.error(`📊 ${apolloServer.getToolCount()} tools available`);
console.error('');