import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as plugins from '../ts/plugins.js';
import { SmartProxy } from '../ts/index.js';
import * as net from 'net';

let smartProxyInstance: SmartProxy;
let echoServer: net.Server;
const echoServerPort = 9876;
const proxyPort = 8080;

// Create an echo server for testing
tap.test('should create echo server for testing', async () => {
  echoServer = net.createServer((socket) => {
    socket.on('data', (data) => {
      socket.write(data); // Echo back the data
    });
  });

  await new Promise<void>((resolve) => {
    echoServer.listen(echoServerPort, () => {
      console.log(`Echo server listening on port ${echoServerPort}`);
      resolve();
    });
  });
});

tap.test('should create SmartProxy instance with new metrics', async () => {
  smartProxyInstance = new SmartProxy({
    routes: [{
      id: 'test-route',  // id is needed for per-route metrics tracking in Rust
      name: 'test-route',
      match: {
        ports: [proxyPort]
        // No domains — port-only route uses fast-path (no data peeking)
      },
      action: {
        type: 'forward',
        targets: [{
          host: 'localhost',
          port: echoServerPort
        }]
        // No TLS — plain TCP forwarding
      }
    }],
    metrics: {
      enabled: true,
      sampleIntervalMs: 100,  // Sample every 100ms for faster testing
      retentionSeconds: 60
    }
  });

  await smartProxyInstance.start();
});

tap.test('should verify new metrics API structure', async () => {
  const metrics = smartProxyInstance.getMetrics();

  // Check API structure
  expect(metrics).toHaveProperty('connections');
  expect(metrics).toHaveProperty('throughput');
  expect(metrics).toHaveProperty('requests');
  expect(metrics).toHaveProperty('totals');
  expect(metrics).toHaveProperty('percentiles');

  // Check connections methods
  expect(metrics.connections).toHaveProperty('active');
  expect(metrics.connections).toHaveProperty('total');
  expect(metrics.connections).toHaveProperty('byRoute');
  expect(metrics.connections).toHaveProperty('byIP');
  expect(metrics.connections).toHaveProperty('topIPs');

  // Check throughput methods
  expect(metrics.throughput).toHaveProperty('instant');
  expect(metrics.throughput).toHaveProperty('recent');
  expect(metrics.throughput).toHaveProperty('average');
  expect(metrics.throughput).toHaveProperty('custom');
  expect(metrics.throughput).toHaveProperty('history');
  expect(metrics.throughput).toHaveProperty('byRoute');
  expect(metrics.throughput).toHaveProperty('byIP');
});

tap.test('should track active connections', async (tools) => {
  const metrics = smartProxyInstance.getMetrics();

  // Initial state - no connections
  expect(metrics.connections.active()).toEqual(0);

  // Create a test connection
  const client = new net.Socket();

  await new Promise<void>((resolve, reject) => {
    client.connect(proxyPort, 'localhost', () => {
      console.log('Connected to proxy');
      resolve();
    });
    client.on('error', reject);
  });

  // Send some data and wait for echo
  const testData = Buffer.from('Hello, World!'.repeat(100)); // ~1.3KB
  await new Promise<void>((resolve) => {
    client.write(testData, () => resolve());
  });
  await new Promise<void>((resolve) => {
    client.once('data', (data) => {
      console.log(`Received ${data.length} bytes back`);
      resolve();
    });
  });

  // Wait for metrics to be polled
  await tools.delayFor(500);

  // Active connection count should be 1
  expect(metrics.connections.active()).toEqual(1);
  // Total connections should be tracked
  expect(metrics.connections.total()).toBeGreaterThan(0);

  // Per-route tracking should show the connection
  const byRoute = metrics.connections.byRoute();
  console.log('Connections by route:', Array.from(byRoute.entries()));
  expect(byRoute.get('test-route')).toEqual(1);

  // Clean up - close the connection
  client.destroy();

  // Wait for connection cleanup
  for (let i = 0; i < 20; i++) {
    await tools.delayFor(100);
    if (metrics.connections.active() === 0) break;
  }
  expect(metrics.connections.active()).toEqual(0);
});

tap.test('should track bytes after connection closes', async (tools) => {
  const metrics = smartProxyInstance.getMetrics();

  // Create a connection, send data, then close it
  const client = new net.Socket();
  await new Promise<void>((resolve, reject) => {
    client.connect(proxyPort, 'localhost', () => resolve());
    client.on('error', reject);
  });

  // Send some data
  const testData = Buffer.from('Hello, World!'.repeat(100)); // ~1.3KB
  await new Promise<void>((resolve) => {
    client.write(testData, () => resolve());
  });

  // Wait for echo
  await new Promise<void>((resolve) => {
    client.once('data', () => resolve());
  });

  // Close the connection — Rust records bytes on connection close
  client.destroy();

  // Wait for connection to fully close and metrics to poll
  for (let i = 0; i < 20; i++) {
    await tools.delayFor(100);
    if (metrics.connections.active() === 0 && metrics.totals.bytesIn() > 0) break;
  }

  // Now bytes should be recorded
  console.log('Total bytes in:', metrics.totals.bytesIn());
  console.log('Total bytes out:', metrics.totals.bytesOut());
  expect(metrics.totals.bytesIn()).toBeGreaterThan(0);
  expect(metrics.totals.bytesOut()).toBeGreaterThan(0);
});

tap.test('should track multiple connections', async (tools) => {
  const metrics = smartProxyInstance.getMetrics();

  // Ensure we start with 0 active connections
  for (let i = 0; i < 20; i++) {
    await tools.delayFor(100);
    if (metrics.connections.active() === 0) break;
  }

  // Create multiple connections
  const clients: net.Socket[] = [];
  const connectionCount = 5;

  for (let i = 0; i < connectionCount; i++) {
    const client = new net.Socket();
    await new Promise<void>((resolve, reject) => {
      client.connect(proxyPort, 'localhost', () => resolve());
      client.on('error', reject);
    });
    clients.push(client);
  }

  // Allow connections to be fully established and metrics polled
  await tools.delayFor(500);

  // Verify active connections
  console.log('Active connections:', metrics.connections.active());
  expect(metrics.connections.active()).toEqual(connectionCount);

  // Per-route should track all connections
  const routeConnections = metrics.connections.byRoute();
  console.log('Connections by route:', Array.from(routeConnections.entries()));
  expect(routeConnections.get('test-route')).toEqual(connectionCount);

  // Clean up all connections
  clients.forEach(client => client.destroy());

  for (let i = 0; i < 20; i++) {
    await tools.delayFor(100);
    if (metrics.connections.active() === 0) break;
  }
  expect(metrics.connections.active()).toEqual(0);
});

tap.test('should provide throughput data', async (tools) => {
  const metrics = smartProxyInstance.getMetrics();

  // Create a connection and send data periodically
  const client = new net.Socket();
  await new Promise<void>((resolve, reject) => {
    client.connect(proxyPort, 'localhost', () => resolve());
    client.on('error', reject);
  });

  // Send data every 100ms for 1 second
  for (let i = 0; i < 10; i++) {
    const data = Buffer.from(`Packet ${i}: `.repeat(100));
    client.write(data);
    await tools.delayFor(100);
  }

  // Close connection so bytes are recorded
  client.destroy();

  // Wait for metrics to update
  for (let i = 0; i < 20; i++) {
    await tools.delayFor(100);
    if (metrics.totals.bytesIn() > 0) break;
  }

  // Verify different time windows are available (all return same data from Rust for now)
  const instant = metrics.throughput.instant();
  const recent = metrics.throughput.recent();
  const average = metrics.throughput.average();

  console.log('Throughput windows:');
  console.log('  Instant (1s):', instant);
  console.log('  Recent (10s):', recent);
  console.log('  Average (60s):', average);

  // Total bytes should have accumulated
  expect(metrics.totals.bytesIn()).toBeGreaterThan(0);
  expect(metrics.totals.bytesOut()).toBeGreaterThan(0);
});

tap.test('should clean up resources', async () => {
  await smartProxyInstance.stop();

  await new Promise<void>((resolve) => {
    echoServer.close(() => {
      console.log('Echo server closed');
      resolve();
    });
  });
});

export default tap.start();