// SCI Security Service
// TPM-backed nodes, PQ-encrypted channels (Kyber), cross-zone firewalls, integrity attestations

import prisma from '@/shared/database/prisma';
import { createHash } from 'crypto';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '@/infrastructure/monitoring/logger';
import { quantumCryptoService } from '@/infrastructure/quantum/quantum-crypto.service';


export interface TpmAttestationRequest {
  zoneId: string;
  nodeId: string;
  tpmData: Record<string, unknown>;
}

export interface IntegrityAttestationRequest {
  zoneId: string;
  attestationType: 'tpm_integrity' | 'pq_encryption' | 'cross_zone_firewall' | 'continuous_integrity';
  attestationData: Record<string, unknown>;
}

export class SciSecurityService {
  /**
   * Create TPM-backed node attestation
   */
  async createTpmAttestation(request: TpmAttestationRequest): Promise<{ attestationId: string }> {
    const attestationId = `ATTEST-${uuidv4()}`;

    // Calculate integrity hash from TPM data
    const integrityHash = this.calculateIntegrityHash(request.tpmData);

    // Create attestation
    await prisma.sovereignAttestation.create({
      data: {
        attestationId,
        zoneId: request.zoneId,
        attestationType: 'tpm_integrity',
        attestationData: request.tpmData as unknown as Record<string, unknown>,
        integrityHash,
        status: 'verified',
        verifiedAt: new Date(),
      },
    });

    logger.info('SCI Security: TPM attestation created', {
      attestationId,
      zoneId: request.zoneId,
      nodeId: request.nodeId,
    });

    return { attestationId };
  }

  /**
   * Create PQ-encrypted channel (Kyber)
   */
  async createPqEncryptedChannel(
    sourceZoneId: string,
    targetZoneId: string
  ): Promise<{ channelId: string; encryptionKey: string }> {
    const channelId = `PQ-CHANNEL-${uuidv4()}`;

    // Generate PQ key pair (Kyber)
    // In production, use actual Kyber implementation
    const keyPair = await quantumCryptoService.generatePQCKeyPair('kyber');

    // Store encryption key (in production, would be securely stored)
    const encryptionKey = keyPair.publicKey;

    // Create attestation for PQ encryption
    await prisma.sovereignAttestation.create({
      data: {
        attestationId: `ATTEST-${uuidv4()}`,
        zoneId: sourceZoneId,
        attestationType: 'pq_encryption',
        attestationData: {
          channelId,
          targetZoneId,
          encryptionKey,
          algorithm: 'kyber',
        } as unknown as Record<string, unknown>,
        integrityHash: createHash('sha256').update(encryptionKey).digest('hex'),
        status: 'verified',
        verifiedAt: new Date(),
      },
    });

    logger.info('SCI Security: PQ-encrypted channel created', {
      channelId,
      sourceZoneId,
      targetZoneId,
    });

    return { channelId, encryptionKey };
  }

  /**
   * Verify cross-zone firewall
   */
  async verifyCrossZoneFirewall(zoneId: string): Promise<boolean> {
    const zone = await prisma.sovereignComputeZone.findUnique({
      where: { zoneId },
    });

    if (!zone) {
      return false;
    }

    const config = zone.zeroTrustConfig as unknown as { networkSegmentation?: boolean };

    // Check if network segmentation is enabled
    if (!config.networkSegmentation) {
      logger.warn('SCI Security: Cross-zone firewall not properly configured', { zoneId });
      return false;
    }

    // Create firewall attestation
    await prisma.sovereignAttestation.create({
      data: {
        attestationId: `ATTEST-${uuidv4()}`,
        zoneId,
        attestationType: 'cross_zone_firewall',
        attestationData: {
          networkSegmentation: true,
          firewallEnabled: true,
        } as unknown as Record<string, unknown>,
        integrityHash: createHash('sha256').update(zoneId).digest('hex'),
        status: 'verified',
        verifiedAt: new Date(),
      },
    });

    logger.info('SCI Security: Cross-zone firewall verified', { zoneId });
    return true;
  }

  /**
   * Create continuous integrity attestation
   */
  async createContinuousIntegrityAttestation(
    request: IntegrityAttestationRequest
  ): Promise<{ attestationId: string }> {
    const attestationId = `ATTEST-${uuidv4()}`;

    // Calculate integrity hash
    const integrityHash = this.calculateIntegrityHash(request.attestationData);

    // Create attestation
    await prisma.sovereignAttestation.create({
      data: {
        attestationId,
        zoneId: request.zoneId,
        attestationType: request.attestationType,
        attestationData: request.attestationData as unknown as Record<string, unknown>,
        integrityHash,
        status: 'verified',
        verifiedAt: new Date(),
      },
    });

    logger.info('SCI Security: Continuous integrity attestation created', {
      attestationId,
      zoneId: request.zoneId,
      attestationType: request.attestationType,
    });

    return { attestationId };
  }

  /**
   * Calculate integrity hash
   */
  private calculateIntegrityHash(data: Record<string, unknown>): string {
    const dataString = JSON.stringify(data);
    return createHash('sha256').update(dataString).digest('hex');
  }

  /**
   * Verify attestation
   */
  async verifyAttestation(attestationId: string): Promise<boolean> {
    const attestation = await prisma.sovereignAttestation.findUnique({
      where: { attestationId },
    });

    if (!attestation) {
      return false;
    }

    // Recalculate hash
    const expectedHash = this.calculateIntegrityHash(
      attestation.attestationData as unknown as Record<string, unknown>
    );

    // Verify hash matches
    return attestation.integrityHash === expectedHash && attestation.status === 'verified';
  }
}

export const sciSecurityService = new SciSecurityService();