// ISP Relay Service
// IRG relay grid messaging with PQC-light

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


export interface RelayMessageRequest {
  sourceNodeId: string;
  targetNodeId: string;
  messageType: string; // settlement, cbdc_issuance, state_sync
  messagePayload: Record<string, unknown>;
  latency?: number; // Estimated latency in seconds
}

export interface RelayResult {
  relayId: string;
  status: string;
}

export class IspRelayService {
  /**
   * Send relay message
   */
  async sendMessage(request: RelayMessageRequest): Promise<RelayResult> {
    const relayId = `ISP-RELAY-${uuidv4()}`;

    // Generate PQC-light signature (simplified - in production would use actual PQC)
    const pqcSignature = this.generatePQCSignature(request.messagePayload);

    // Calculate latency based on planetary locations
    const latency = request.latency || await this.calculateLatency(
      request.sourceNodeId,
      request.targetNodeId
    );

    const relay = await prisma.interplanetary_relay_grid.create({
      data: {
        relayId,
        sourceNodeId: request.sourceNodeId,
        targetNodeId: request.targetNodeId,
        relayType: 'deep_space_relay',
        messageType: request.messageType,
        messagePayload: request.messagePayload,
        pqcSignature,
        latency,
        highLatencyBuffer: latency > 300, // Buffer for high latency (>5 minutes)
        status: 'pending',
      },
    });

    // Simulate relay delivery (in production, this would be async)
    setTimeout(async () => {
      await prisma.interplanetary_relay_grid.update({
        where: { relayId },
        data: {
          status: 'relayed',
          relayedAt: new Date(),
        },
      });
    }, 100);

    return {
      relayId: relay.relayId,
      status: relay.status,
    };
  }

  /**
   * Calculate latency between nodes
   */
  private async calculateLatency(sourceNodeId: string, targetNodeId: string): Promise<number> {
    const sourceNode = await prisma.interplanetary_nodes.findUnique({
      where: { nodeId: sourceNodeId },
    });
    const targetNode = await prisma.interplanetary_nodes.findUnique({
      where: { nodeId: targetNodeId },
    });

    if (!sourceNode || !targetNode) {
      return 300; // Default 5 minutes
    }

    // Latency estimates (in seconds)
    const latencyMap: Record<string, Record<string, number>> = {
      earth: {
        earth: 0.1,
        lunar: 1.3,
        martian: 1200, // ~20 minutes
      },
      lunar: {
        earth: 1.3,
        lunar: 0.1,
        martian: 1200,
      },
      martian: {
        earth: 1200,
        lunar: 1200,
        martian: 0.1,
      },
    };

    return latencyMap[sourceNode.planetaryLocation]?.[targetNode.planetaryLocation] || 300;
  }

  /**
   * Generate PQC-light signature (simplified)
   */
  private generatePQCSignature(payload: Record<string, unknown>): string {
    // In production, this would use actual post-quantum cryptography
    // For now, use SHA-3 as placeholder
    const payloadStr = JSON.stringify(payload);
    return createHash('sha3-256').update(payloadStr).digest('hex');
  }

  /**
   * Get relay message
   */
  async getRelay(relayId: string) {
    return await prisma.interplanetary_relay_grid.findUnique({
      where: { relayId },
      include: {
        sourceNode: true,
        targetNode: true,
      },
    });
  }

  /**
   * List relay messages
   */
  async listRelays(sourceNodeId?: string, targetNodeId?: string) {
    return await prisma.interplanetary_relay_grid.findMany({
      where: {
        ...(sourceNodeId ? { sourceNodeId } : {}),
        ...(targetNodeId ? { targetNodeId } : {}),
      },
      orderBy: { createdAt: 'desc' },
    });
  }
}

export const ispRelayService = new IspRelayService();

