import { createMCPServer } from '../src';
import { InMemoryStore } from '../src/stores';

/**
 * Basic MCP Server Example
 * 
 * This example demonstrates how to create a simple MCP server
 * using the official @modelcontextprotocol/sdk under the hood.
 * 
 * The server will:
 * - Listen on POST /mcp (standard MCP endpoint)
 * - Support all standard MCP clients (Inspector, Claude, etc.)
 * - Provide webhook subscription extensions
 * 
 * Test with:
 * - npx @modelcontextprotocol/inspector http://localhost:3000/mcp
 * - curl -X POST http://localhost:3000/mcp -H "Content-Type: application/json" \
 *     -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
 */

const store = new InMemoryStore();

const server = createMCPServer({
  name: 'example-server',
  version: '1.0.0',
  publicUrl: process.env.PUBLIC_URL || 'http://localhost:3000',
  port: 3000,
  store,

  // Simple tools
  tools: [
    {
      name: 'echo',
      description: 'Echo back the input message',
      inputSchema: {
        type: 'object',
        properties: {
          message: {
            type: 'string',
            description: 'Message to echo',
          },
        },
        required: ['message'],
      },
      handler: async (input) => {
        return {
          echo: input.message,
          timestamp: new Date().toISOString(),
        };
      },
    },
    {
      name: 'add',
      description: 'Add two numbers',
      inputSchema: {
        type: 'object',
        properties: {
          a: { type: 'number', description: 'First number' },
          b: { type: 'number', description: 'Second number' },
        },
        required: ['a', 'b'],
      },
      handler: async (input) => {
        return {
          result: input.a + input.b,
        };
      },
    },
  ],

  // Simple resources
  resources: [
    {
      uri: 'example://greeting/{name}',
      name: 'Greeting Resource',
      description: 'Returns a personalized greeting',
      mimeType: 'text/plain',

      read: async (uri) => {
        console.log('Reading resource:', uri);
        const parts = uri.split('/');
        const name = parts[parts.length - 1];
        return {
          contents: `Hello, ${name}!`,
        };
      },

      list: async () => {
        return [
          {
            uri: 'example://greeting/world',
            name: 'World Greeting',
            description: 'Greeting for the world',
          },
          {
            uri: 'example://greeting/alice',
            name: 'Alice Greeting',
            description: 'Greeting for Alice',
          },
        ];
      },
    },
  ],

  // Optional: Simple authentication
  authenticate: async (req) => {
    // const apiKey = req.headers['x-api-key'];
    // if (!apiKey) {
    //   throw new Error('API key required');
    // }

    // In production, validate against database
    return {
      userId: 'user-123',
      apiKey: 'apiKey' as string,
    };
  },

  logLevel: 'info',
});

// Start server
server.start().then(() => {
  console.log('Server running!');
  console.log('Try these requests:');
  console.log('');
  console.log('POST http://localhost:3000/mcp/tools/list');
  console.log('POST http://localhost:3000/mcp/tools/call');
  console.log('  Body: { "method": "tools/call", "params": { "name": "echo", "arguments": { "message": "Hello" } } }');
  console.log('');
  console.log('POST http://localhost:3000/mcp/resources/list');
  console.log('POST http://localhost:3000/mcp/resources/read');
  console.log('  Body: { "method": "resources/read", "params": { "uri": "example://greeting/world" } }');
});

// Graceful shutdown
process.on('SIGTERM', async () => {
  console.log('Shutting down...');
  await server.stop();
  store.destroy();
  process.exit(0);
});