// Sovereign Graph Security Engine (SGSE)
// ML-based anomaly detection, PQ-signature validation, graph-based threat analysis

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';


export interface AnomalyDetectionResult {
  anomalyId: string;
  detectionMethod: string;
  confidence: number;
  severity: string;
  affectedNodes: string[];
}

export class SovereignGraphSecurityService {
  /**
   * Get or create SGSE instance
   */
  async getOrCreateSGSE() {
    const existing = await prisma.sovereign_graph_security_engines.findFirst({
      where: { graphType: 'threat_graph' },
    });

    if (existing) {
      return existing;
    }

    return await prisma.sovereign_graph_security_engines.create({
      data: {
        sgseId: `SGSE-${uuidv4()}`,
        graphType: 'threat_graph',
        graphData: {
          nodes: [],
          edges: [],
        },
        nodeCount: 0,
        edgeCount: 0,
        status: 'active',
      },
    });
  }

  /**
   * Detect anomaly using ML-based detection
   */
  async detectAnomaly(
    threatType: string,
    severity: string
  ): Promise<AnomalyDetectionResult> {
    const sgse = await this.getOrCreateSGSE();

    // ML-based anomaly detection logic
    const anomalyId = `ANOMALY-${uuidv4()}`;

    const result: AnomalyDetectionResult = {
      anomalyId,
      detectionMethod: 'ml_anomaly',
      confidence: 0.85, // ML confidence score
      severity,
      affectedNodes: [],
    };

    // Update graph with detected anomaly
    await this.updateThreatGraph(anomalyId, threatType, severity);

    return result;
  }

  /**
   * Validate PQ signature
   */
  async validatePQSignature(
    signature: string,
    publicKey: string,
    message: string,
    algorithm: string = 'XMSS'
  ): Promise<boolean> {
    // PQ signature validation logic
    // In production, would use actual PQC library

    // For now, simulate validation
    return signature.length > 0 && publicKey.length > 0;
  }

  /**
   * Update threat graph
   */
  async updateThreatGraph(
    anomalyId: string,
    threatType: string,
    severity: string
  ) {
    const sgse = await this.getOrCreateSGSE();

    const graphData = sgse.graphData as Record<string, unknown> || {};
    const nodes = (graphData.nodes as any[]) || [];
    const edges = (graphData.edges as any[]) || [];

    // Add threat node
    const threatNode = {
      id: anomalyId,
      type: 'threat',
      label: threatType,
      severity,
      timestamp: new Date(),
    };

    nodes.push(threatNode);

    // Update edge count if connecting to existing nodes
    if (nodes.length > 1) {
      edges.push({
        source: nodes[nodes.length - 2].id,
        target: anomalyId,
        type: 'threat_connection',
      });
    }

    await prisma.sovereign_graph_security_engines.update({
      where: { id: sgse.id },
      data: {
        graphData: {
          nodes,
          edges,
        },
        nodeCount: nodes.length,
        edgeCount: edges.length,
        lastUpdated: new Date(),
      },
    });
  }

  /**
   * Analyze graph for threat patterns
   */
  async analyzeThreatPatterns() {
    const sgse = await this.getOrCreateSGSE();

    const graphData = sgse.graphData as Record<string, unknown> || {};
    const nodes = (graphData.nodes as any[]) || [];
    const edges = (graphData.edges as any[]) || [];

    // Analyze patterns
    const criticalThreats = nodes.filter((node: any) => node.severity === 'critical');
    const connectedThreats = edges.filter((edge: any) => edge.type === 'threat_connection');

    return {
      totalThreats: nodes.length,
      criticalThreats: criticalThreats.length,
      connectedThreats: connectedThreats.length,
      threatClusters: this.identifyThreatClusters(nodes, edges),
    };
  }

  /**
   * Identify threat clusters in graph
   */
  private identifyThreatClusters(nodes: any[], edges: any[]): string[] {
    // Simple clustering algorithm
    // In production, would use more sophisticated graph analysis

    const clusters: string[] = [];
    const visited = new Set<string>();

    for (const node of nodes) {
      if (!visited.has(node.id)) {
        const cluster = this.dfsCluster(node.id, nodes, edges, visited);
        if (cluster.length > 1) {
          clusters.push(`Cluster-${cluster.join('-')}`);
        }
      }
    }

    return clusters;
  }

  /**
   * Depth-first search for threat clusters
   */
  private dfsCluster(
    nodeId: string,
    nodes: any[],
    edges: any[],
    visited: Set<string>
  ): string[] {
    const cluster: string[] = [nodeId];
    visited.add(nodeId);

    const connectedEdges = edges.filter(
      (e) => e.source === nodeId || e.target === nodeId
    );

    for (const edge of connectedEdges) {
      const nextNodeId = edge.source === nodeId ? edge.target : edge.source;
      if (!visited.has(nextNodeId)) {
        cluster.push(...this.dfsCluster(nextNodeId, nodes, edges, visited));
      }
    }

    return cluster;
  }

  /**
   * Get threat graph statistics
   */
  async getGraphStatistics() {
    const sgse = await this.getOrCreateSGSE();

    return {
      nodeCount: sgse.nodeCount,
      edgeCount: sgse.edgeCount,
      lastUpdated: sgse.lastUpdated,
      graphType: sgse.graphType,
    };
  }
}

export const sovereignGraphSecurityService = new SovereignGraphSecurityService();

