import { tap, expect } from '@git.zone/tstest/tapbundle';
import { startTestServer, stopTestServer, type ITestServer } from '../../helpers/server.loader.js';
import { createBulkSmtpClient, createPooledSmtpClient } from '../../../ts/mail/delivery/smtpclient/index.js';
import type { SmtpClient } from '../../../ts/mail/delivery/smtpclient/smtp-client.js';
import { Email } from '../../../ts/mail/core/classes.email.js';

let testServer: ITestServer;
let bulkClient: SmtpClient;

tap.test('setup - start SMTP server for bulk sending tests', async () => {
  testServer = await startTestServer({
    port: 2580,
    tlsEnabled: false,
    authRequired: false,
    maxConnections: 20,
    size: 5 * 1024 * 1024 // 5MB per message
  });
  
  expect(testServer.port).toEqual(2580);
});

tap.test('CPERF-01: Bulk Sending - should send 100 emails efficiently', async (tools) => {
  tools.timeout(60000); // 60 second timeout for bulk test
  
  bulkClient = createBulkSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    debug: false // Disable debug for performance
  });
  
  const emailCount = 100;
  const startTime = Date.now();
  
  // Create batch of emails
  const emails = [];
  for (let i = 0; i < emailCount; i++) {
    emails.push(new Email({
      from: 'bulk-sender@example.com',
      to: `recipient-${i}@example.com`,
      subject: `Bulk Email ${i + 1}`,
      text: `This is bulk email number ${i + 1} of ${emailCount}`,
      html: `<p>This is <strong>bulk email</strong> number ${i + 1} of ${emailCount}</p>`
    }));
  }
  
  // Send all emails
  const results = await Promise.all(
    emails.map(email => bulkClient.sendMail(email))
  );
  
  const duration = Date.now() - startTime;
  const successCount = results.filter(r => r.success).length;
  
  expect(successCount).toEqual(emailCount);
  
  const rate = (emailCount / (duration / 1000)).toFixed(2);
  console.log(`✅ Sent ${emailCount} emails in ${duration}ms (${rate} emails/sec)`);
  
  // Performance expectations
  expect(duration).toBeLessThan(30000); // Should complete within 30 seconds
  expect(parseFloat(rate)).toBeGreaterThan(3); // At least 3 emails/sec
});

tap.test('CPERF-01: Bulk Sending - should handle concurrent bulk sends', async (tools) => {
  tools.timeout(30000);
  
  const concurrentBatches = 5;
  const emailsPerBatch = 20;
  const startTime = Date.now();
  
  // Create multiple batches
  const batches = [];
  for (let batch = 0; batch < concurrentBatches; batch++) {
    const batchEmails = [];
    for (let i = 0; i < emailsPerBatch; i++) {
      batchEmails.push(new Email({
        from: 'batch-sender@example.com',
        to: `batch${batch}-recipient${i}@example.com`,
        subject: `Batch ${batch} Email ${i}`,
        text: `Concurrent batch ${batch}, email ${i}`
      }));
    }
    batches.push(batchEmails);
  }
  
  // Send all batches concurrently
  const batchResults = await Promise.all(
    batches.map(batchEmails => 
      Promise.all(batchEmails.map(email => bulkClient.sendMail(email)))
    )
  );
  
  const duration = Date.now() - startTime;
  const totalEmails = concurrentBatches * emailsPerBatch;
  const successCount = batchResults.flat().filter(r => r.success).length;
  
  expect(successCount).toEqual(totalEmails);
  
  const rate = (totalEmails / (duration / 1000)).toFixed(2);
  console.log(`✅ Sent ${totalEmails} emails in ${concurrentBatches} concurrent batches`);
  console.log(`   Duration: ${duration}ms (${rate} emails/sec)`);
  
  // Check pool utilization
  const poolStatus = bulkClient.getPoolStatus();
  console.log('📊 Pool status during bulk send:', poolStatus);
});

tap.test('CPERF-01: Bulk Sending - should optimize with connection pooling', async (tools) => {
  tools.timeout(30000);
  
  // Compare pooled vs non-pooled performance
  const testEmails = 50;
  
  // Test 1: With pooling
  const pooledClient = createPooledSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    maxConnections: 5,
    debug: false
  });
  
  const pooledStart = Date.now();
  const pooledPromises = [];
  
  for (let i = 0; i < testEmails; i++) {
    const email = new Email({
      from: 'pooled@example.com',
      to: `recipient${i}@example.com`,
      subject: `Pooled Email ${i}`,
      text: 'Testing pooled performance'
    });
    pooledPromises.push(pooledClient.sendMail(email));
  }
  
  await Promise.all(pooledPromises);
  const pooledDuration = Date.now() - pooledStart;
  const pooledRate = (testEmails / (pooledDuration / 1000)).toFixed(2);
  
  await pooledClient.close();
  
  console.log(`✅ Pooled client: ${testEmails} emails in ${pooledDuration}ms (${pooledRate} emails/sec)`);
  
  // Pooled should be significantly faster
  expect(parseFloat(pooledRate)).toBeGreaterThan(2);
});

tap.test('CPERF-01: Bulk Sending - should handle large bulk emails', async (tools) => {
  tools.timeout(60000);
  
  // Create emails with attachments
  const largeEmailCount = 20;
  const attachmentSize = 100 * 1024; // 100KB attachment
  const attachmentData = Buffer.alloc(attachmentSize);
  
  // Fill with random data
  for (let i = 0; i < attachmentSize; i++) {
    attachmentData[i] = Math.floor(Math.random() * 256);
  }
  
  const startTime = Date.now();
  const promises = [];
  
  for (let i = 0; i < largeEmailCount; i++) {
    const email = new Email({
      from: 'bulk-sender@example.com',
      to: `recipient${i}@example.com`,
      subject: `Large Bulk Email ${i}`,
      text: 'This email contains an attachment',
      attachments: [{
        filename: `attachment-${i}.dat`,
        content: attachmentData,
        contentType: 'application/octet-stream'
      }]
    });
    promises.push(bulkClient.sendMail(email));
  }
  
  const results = await Promise.all(promises);
  const duration = Date.now() - startTime;
  const successCount = results.filter(r => r.success).length;
  
  expect(successCount).toEqual(largeEmailCount);
  
  const totalSize = largeEmailCount * attachmentSize;
  const throughput = (totalSize / 1024 / 1024 / (duration / 1000)).toFixed(2);
  
  console.log(`✅ Sent ${largeEmailCount} emails with attachments in ${duration}ms`);
  console.log(`   Total data: ${(totalSize / 1024 / 1024).toFixed(2)}MB`);
  console.log(`   Throughput: ${throughput} MB/s`);
});

tap.test('CPERF-01: Bulk Sending - should maintain performance under sustained load', async (tools) => {
  tools.timeout(120000); // 2 minutes
  
  const sustainedDuration = 30000; // 30 seconds
  const startTime = Date.now();
  let emailsSent = 0;
  let errors = 0;
  
  console.log('📊 Starting sustained load test...');
  
  // Send emails continuously for duration
  while (Date.now() - startTime < sustainedDuration) {
    const email = new Email({
      from: 'sustained@example.com',
      to: 'recipient@example.com',
      subject: `Sustained Load Email ${emailsSent + 1}`,
      text: `Email sent at ${new Date().toISOString()}`
    });
    
    try {
      const result = await bulkClient.sendMail(email);
      if (result.success) {
        emailsSent++;
      } else {
        errors++;
      }
    } catch (error) {
      errors++;
    }
    
    // Log progress every 10 emails
    if (emailsSent % 10 === 0 && emailsSent > 0) {
      const elapsed = Date.now() - startTime;
      const rate = (emailsSent / (elapsed / 1000)).toFixed(2);
      console.log(`   Progress: ${emailsSent} emails, ${rate} emails/sec`);
    }
  }
  
  const totalDuration = Date.now() - startTime;
  const avgRate = (emailsSent / (totalDuration / 1000)).toFixed(2);
  
  console.log(`✅ Sustained load test completed:`);
  console.log(`   Duration: ${totalDuration}ms`);
  console.log(`   Emails sent: ${emailsSent}`);
  console.log(`   Errors: ${errors}`);
  console.log(`   Average rate: ${avgRate} emails/sec`);
  
  expect(emailsSent).toBeGreaterThan(50); // Should send many emails
  expect(errors).toBeLessThan(emailsSent * 0.05); // Less than 5% error rate
});

tap.test('CPERF-01: Bulk Sending - should track performance metrics', async () => {
  const metricsClient = createBulkSmtpClient({
    host: testServer.hostname,
    port: testServer.port,
    secure: false,
    debug: false
  });
  
  const metrics = {
    sent: 0,
    failed: 0,
    totalTime: 0,
    minTime: Infinity,
    maxTime: 0
  };
  
  // Send emails and collect metrics
  for (let i = 0; i < 20; i++) {
    const email = new Email({
      from: 'metrics@example.com',
      to: `recipient${i}@example.com`,
      subject: `Metrics Test ${i}`,
      text: 'Collecting performance metrics'
    });
    
    const sendStart = Date.now();
    try {
      const result = await metricsClient.sendMail(email);
      const sendTime = Date.now() - sendStart;
      
      if (result.success) {
        metrics.sent++;
        metrics.totalTime += sendTime;
        metrics.minTime = Math.min(metrics.minTime, sendTime);
        metrics.maxTime = Math.max(metrics.maxTime, sendTime);
      } else {
        metrics.failed++;
      }
    } catch (error) {
      metrics.failed++;
    }
  }
  
  const avgTime = metrics.totalTime / metrics.sent;
  
  console.log('📊 Performance metrics:');
  console.log(`   Sent: ${metrics.sent}`);
  console.log(`   Failed: ${metrics.failed}`);
  console.log(`   Avg time: ${avgTime.toFixed(2)}ms`);
  console.log(`   Min time: ${metrics.minTime}ms`);
  console.log(`   Max time: ${metrics.maxTime}ms`);
  
  await metricsClient.close();
  
  expect(metrics.sent).toBeGreaterThan(0);
  expect(avgTime).toBeLessThan(5000); // Average should be under 5 seconds
});

tap.test('cleanup - close bulk client', async () => {
  if (bulkClient && bulkClient.isConnected()) {
    const finalStatus = bulkClient.getPoolStatus();
    console.log('📊 Final pool status:', finalStatus);
    await bulkClient.close();
  }
});

tap.test('cleanup - stop SMTP server', async () => {
  await stopTestServer(testServer);
});

tap.start();