const jwt = require('jsonwebtoken');

// Token generation
function generateToken(agent) {
  return jwt.sign(
    {
      id: agent.id,
      role: agent.role,
      capabilities: agent.capabilities,
      iat: Math.floor(Date.now() / 1000),
      exp: Math.floor(Date.now() / 1000) + (60 * 60) // 1 hour
    },
    process.env.JWT_SECRET,
    { algorithm: 'ES256' }
  );
}

// Token verification
function verifyToken(token) {
  try {
    return jwt.verify(token, process.env.JWT_SECRET);
  } catch (err) {
    throw new Error('Invalid token');
  }
}

const https = require('https');
const fs = require('fs');

const options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('certificate.pem'),
  ciphers: [
    'TLS_AES_128_GCM_SHA256',
    'TLS_AES_256_GCM_SHA384',
    'TLS_CHACHA20_POLY1305_SHA256'
  ].join(':'),
  minVersion: 'TLSv1.3'
};

https.createServer(options, app);

const rateLimit = require('express-rate-limit');

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // limit each IP to 100 requests per windowMs
  message: 'Too many requests, please try again later',
  standardHeaders: true,
  legacyHeaders: false
});

app.use('/api/', limiter);

const crypto = require('crypto');

class DataEncryption {
  constructor(key) {
    this.key = key;
  }

  encrypt(data) {
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv('aes-256-gcm', this.key, iv);
    const encrypted = Buffer.concat([
      cipher.update(data, 'utf8'),
      cipher.final()
    ]);
    const tag = cipher.getAuthTag();
    return {
      iv: iv.toString('hex'),
      data: encrypted.toString('hex'),
      tag: tag.toString('hex')
    };
  }

  decrypt(encrypted) {
    const decipher = crypto.createDecipheriv(
      'aes-256-gcm',
      this.key,
      Buffer.from(encrypted.iv, 'hex')
    );
    decipher.setAuthTag(Buffer.from(encrypted.tag, 'hex'));
    const decrypted = Buffer.concat([
      decipher.update(Buffer.from(encrypted.data, 'hex')),
      decipher.final()
    ]);
    return decrypted.toString('utf8');
  }
}

const { z } = require('zod');

const RequestSchema = z.object({
  model: z.string(),
  input: z.string().max(1000),
  parameters: z.object({
    temperature: z.number().min(0).max(1),
    maxTokens: z.number().positive()
  }).optional()
});

function validateRequest(data) {
  return RequestSchema.parse(data);
}

class TrustVerifier {
  async verifyPeer(peerId, certificate) {
    // 1. Verify certificate chain
    const validCert = await this.verifyCertificate(certificate);
    if (!validCert) return false;

    // 2. Check DNS-SEC records
    const validDns = await this.verifyDnsSec(peerId);
    if (!validDns) return false;

    // 3. Check web of trust
    const validTrust = await this.verifyWebOfTrust(peerId);
    if (!validTrust) return false;

    return true;
  }
}

class SecureResourceManager {
  async shareResource(peer, resource) {
    // 1. Verify peer trust level
    const trustLevel = await this.getTrustLevel(peer);
    if (trustLevel < resource.minTrustLevel) {
      throw new Error('Insufficient trust level');
    }

    // 2. Encrypt resource
    const encrypted = await this.encryptResource(resource);

    // 3. Create access token
    const token = await this.createResourceToken(peer, resource);

    return { encrypted, token };
  }
}

function sanitizeInput(input) {
  // Remove potential XSS
  input = input.replace(/<[^>]*>/g, '');
  
  // Remove potential SQL injection
  input = input.replace(/['";]/g, '');
  
  // Remove potential command injection
  input = input.replace(/[&|;$]/g, '');
  
  return input;
}

class MemoryGuard {
  constructor() {
    this.heapLimit = 1024 * 1024 * 1024; // 1GB
    this.monitor = new MemoryMonitor();
  }

  async allocate(bytes) {
    if (this.monitor.getCurrentUsage() + bytes > this.heapLimit) {
      throw new Error('Memory limit exceeded');
    }
    // Allocate memory
  }
}

class SecurityLogger {
  log(event) {
    const entry = {
      timestamp: new Date().toISOString(),
      level: event.level,
      type: event.type,
      details: event.details,
      source: event.source
    };
    
    // Store log securely
    this.store.append(entry);
  }
}

class SecurityMonitor {
  async checkThresholds() {
    // Check failed auth attempts
    if (this.failedAuth > this.thresholds.auth) {
      await this.raiseAlert('auth_breach');
    }
    
    // Check rate limit violations
    if (this.rateViolations > this.thresholds.rate) {
      await this.raiseAlert('rate_abuse');
    }
  }
}