import { tap, expect } from '@git.zone/tstest/tapbundle';
import * as plugins from '../../../ts/plugins.js';
import * as net from 'net';
import { startTestServer, stopTestServer } from '../../helpers/server.loader.js'
import type { ITestServer } from '../../helpers/server.loader.js';

const TEST_PORT = 2525;
let testServer: ITestServer;

tap.test('setup - start test server', async (toolsArg) => {
  testServer = await startTestServer({ port: TEST_PORT });
  await toolsArg.delayFor(1000);
});

tap.test('RFC 7489 DMARC - Server handles DMARC policies', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  const dmarcResults: any[] = [];
  
  // Test domains simulating different DMARC policies
  const dmarcTestScenarios = [
    {
      domain: 'dmarc-reject.example.com',
      policy: 'reject',
      alignment: 'strict'
    },
    {
      domain: 'dmarc-quarantine.example.com', 
      policy: 'quarantine',
      alignment: 'relaxed'
    },
    {
      domain: 'dmarc-none.example.com',
      policy: 'none',
      alignment: 'relaxed'
    }
  ];
  
  let currentScenarioIndex = 0;
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      // Check if server advertises DMARC support
      const advertisesDmarc = dataBuffer.toLowerCase().includes('dmarc');
      console.log('Server advertises DMARC:', advertisesDmarc);
      
      step = 'test_scenarios';
      testNextScenario();
    } else if (step === 'test_scenarios') {
      handleScenarioResponse();
    }
  });
  
  function testNextScenario() {
    if (currentScenarioIndex >= dmarcTestScenarios.length) {
      // All tests complete
      console.log('DMARC test results:', dmarcResults);
      
      // Check that server handled all scenarios
      const allScenariosHandled = dmarcResults.every(result => 
        result.mailFromResponse !== undefined
      );
      
      expect(allScenariosHandled).toEqual(true);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
      return;
    }
    
    const scenario = dmarcTestScenarios[currentScenarioIndex];
    const testFromAddress = `dmarc-test@${scenario.domain}`;
    
    dmarcResults[currentScenarioIndex] = {
      domain: scenario.domain,
      policy: scenario.policy,
      mailFromAccepted: false,
      rcptAccepted: false
    };
    
    console.log(`Testing DMARC policy: ${scenario.policy} for domain: ${scenario.domain}`);
    socket.write(`MAIL FROM:<${testFromAddress}>\r\n`);
    dataBuffer = '';
  }
  
  function handleScenarioResponse() {
    const currentResult = dmarcResults[currentScenarioIndex];
    
    if (dataBuffer.includes('250') && dataBuffer.includes('sender accepted')) {
      currentResult.mailFromAccepted = true;
      currentResult.mailFromResponse = dataBuffer.trim();
      socket.write(`RCPT TO:<recipient@example.com>\r\n`);
      dataBuffer = '';
    } else if (dataBuffer.includes('250') && dataBuffer.includes('recipient accepted')) {
      currentResult.rcptAccepted = true;
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (dataBuffer.includes('354')) {
      // Send email with DMARC-relevant headers
      const scenario = dmarcTestScenarios[currentScenarioIndex];
      const email = [
        `From: dmarc-test@${scenario.domain}`,
        `To: recipient@example.com`,
        `Subject: DMARC RFC 7489 Compliance Test - ${scenario.policy}`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <dmarc-test-${scenario.policy}-${Date.now()}@${scenario.domain}>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=${scenario.domain}; s=default;`,
        `        h=from:to:subject:date; bh=testbodyhash; b=testsignature`,
        `Authentication-Results: example.org; spf=pass smtp.mailfrom=${scenario.domain}`,
        '',
        `This email tests DMARC ${scenario.policy} policy compliance.`,
        'The server should handle DMARC policies according to RFC 7489.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') && dataBuffer.includes('Message accepted')) {
      currentResult.emailAccepted = true;
      console.log(`DMARC ${currentResult.policy} policy email accepted`);
      
      // Reset and test next scenario
      socket.write('RSET\r\n');
      dataBuffer = '';
    } else if (dataBuffer.includes('250') && dataBuffer.includes('Reset')) {
      currentScenarioIndex++;
      testNextScenario();
    } else if (dataBuffer.includes('550') || dataBuffer.includes('553')) {
      // DMARC policy rejection (expected for some scenarios)
      currentResult.dmarcRejected = true;
      currentResult.rejectionResponse = dataBuffer.trim();
      console.log(`DMARC ${currentResult.policy} policy rejected as expected`);
      
      // Reset and test next scenario
      socket.write('RSET\r\n');
      dataBuffer = '';
    }
  }
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('RFC 7489 DMARC - Alignment testing', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Test misaligned domain (envelope vs header)
      socket.write('MAIL FROM:<sender@envelope-domain.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      // Email with different header From domain (testing alignment)
      const email = [
        `From: sender@header-domain.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Alignment Test`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <alignment-${Date.now()}@header-domain.com>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=header-domain.com; s=default;`,
        `        h=from:to:subject:date; bh=alignmenthash; b=alignmentsig`,
        '',
        'Testing DMARC domain alignment (envelope vs header From).',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const accepted = dataBuffer.includes('250');
      console.log(`Alignment test ${accepted ? 'accepted' : 'rejected due to alignment failure'}`);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('RFC 7489 DMARC - Subdomain policy', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      // Test subdomain policy inheritance
      socket.write('MAIL FROM:<sender@subdomain.dmarc-policy.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      // Email from subdomain to test policy inheritance
      const email = [
        `From: sender@subdomain.dmarc-policy.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Subdomain Policy Test`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <subdomain-${Date.now()}@subdomain.dmarc-policy.com>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=subdomain.dmarc-policy.com; s=default;`,
        `        h=from:to:subject:date; bh=subdomainhash; b=subdomainsig`,
        '',
        'Testing DMARC subdomain policy inheritance.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') || dataBuffer.includes('550 ')) {
      const accepted = dataBuffer.includes('250');
      console.log(`Subdomain policy test ${accepted ? 'accepted' : 'rejected'}`);
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

tap.test('RFC 7489 DMARC - Report generation hint', async (tools) => {
  const done = tools.defer();
  
  const socket = net.createConnection({
    host: 'localhost',
    port: TEST_PORT,
    timeout: 30000
  });
  
  let dataBuffer = '';
  let step = 'greeting';
  
  socket.on('data', (data) => {
    dataBuffer += data.toString();
    console.log('Server response:', data.toString());
    
    if (step === 'greeting' && dataBuffer.includes('220 ')) {
      step = 'ehlo';
      socket.write('EHLO testclient\r\n');
      dataBuffer = '';
    } else if (step === 'ehlo' && dataBuffer.includes('250')) {
      step = 'mail';
      socket.write('MAIL FROM:<dmarc-report@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'mail' && dataBuffer.includes('250')) {
      step = 'rcpt';
      socket.write('RCPT TO:<recipient@example.com>\r\n');
      dataBuffer = '';
    } else if (step === 'rcpt' && dataBuffer.includes('250')) {
      step = 'data';
      socket.write('DATA\r\n');
      dataBuffer = '';
    } else if (step === 'data' && dataBuffer.includes('354')) {
      // Email with DMARC report request headers
      const email = [
        `From: dmarc-report@example.com`,
        `To: recipient@example.com`,
        `Subject: DMARC Report Generation Test`,
        `Date: ${new Date().toUTCString()}`,
        `Message-ID: <report-${Date.now()}@example.com>`,
        `DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=default;`,
        `        h=from:to:subject:date; bh=reporthash; b=reportsig`,
        `Authentication-Results: mta.example.com;`,
        `        dmarc=pass (p=none dis=none) header.from=example.com`,
        '',
        'Testing DMARC report generation capabilities.',
        'Server should log DMARC results for reporting.',
        '.',
        ''
      ].join('\r\n');
      
      socket.write(email);
      dataBuffer = '';
    } else if (dataBuffer.includes('250 ') && dataBuffer.includes('Message accepted')) {
      console.log('DMARC report test email accepted');
      
      socket.write('QUIT\r\n');
      socket.end();
      done.resolve();
    }
  });
  
  socket.on('error', (err) => {
    console.error('Socket error:', err);
    done.reject(err);
  });
  
  await done.promise;
});

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

tap.start();