// ISP Settlement Service
// Interplanetary settlement execution

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { createHash } from 'crypto';
import { ispTemporalService } from './isp-temporal.service';


export interface SettlementRequest {
  sourceNodeId: string;
  targetNodeId: string;
  amount: string;
  currencyCode: string;
  assetType: string; // cbdc, ssu, fiat, commodity
  settlementType?: string; // direct, relayed, temporal
  futureStateEstimate?: Record<string, unknown>;
  communicationDelay?: number;
}

export interface SettlementResult {
  settlementId: string;
  status: string;
  tseId?: string;
}

export class IspSettlementService {
  /**
   * Execute interplanetary settlement
   */
  async executeSettlement(request: SettlementRequest): Promise<SettlementResult> {
    const settlementId = `ISP-SETTLE-${uuidv4()}`;

    // Create hash lock for finality
    const hashLock = createHash('sha3-256')
      .update(`${settlementId}-${request.amount}-${Date.now()}`)
      .digest('hex');

    const settlement = await prisma.interplanetarySettlement.create({
      data: {
        settlementId,
        sourceNodeId: request.sourceNodeId,
        targetNodeId: request.targetNodeId,
        amount: new Decimal(request.amount),
        currencyCode: request.currencyCode,
        assetType: request.assetType,
        settlementType: request.settlementType || 'direct',
        hashLock,
        status: 'pending',
      },
    });

    // If temporal settlement, create TSE
    let tseId: string | undefined;
    if (request.settlementType === 'temporal' && request.futureStateEstimate) {
      const tse = await ispTemporalService.createTSE({
        settlementId,
        futureStateEstimate: request.futureStateEstimate,
        communicationDelay: request.communicationDelay || 300,
      });
      tseId = tse.tseId;
    }

    // Mark as committed (in production, this would wait for actual settlement)
    await prisma.interplanetarySettlement.update({
      where: { settlementId },
      data: {
        status: 'committed',
        committedAt: new Date(),
      },
    });

    return {
      settlementId: settlement.settlementId,
      status: 'committed',
      tseId,
    };
  }

  /**
   * Finalize settlement
   */
  async finalizeSettlement(settlementId: string): Promise<void> {
    await prisma.interplanetarySettlement.update({
      where: { settlementId },
      data: {
        status: 'final',
        settledAt: new Date(),
        finalizedAt: new Date(),
      },
    });
  }

  /**
   * Get settlement
   */
  async getSettlement(settlementId: string) {
    return await prisma.interplanetarySettlement.findUnique({
      where: { settlementId },
      include: {
        sourceNode: true,
        targetNode: true,
        temporalEngine: true,
      },
    });
  }

  /**
   * List settlements
   */
  async listSettlements(sourceNodeId?: string, targetNodeId?: string) {
    return await prisma.interplanetarySettlement.findMany({
      where: {
        ...(sourceNodeId ? { sourceNodeId } : {}),
        ...(targetNodeId ? { targetNodeId } : {}),
      },
      orderBy: { createdAt: 'desc' },
    });
  }
}

export const ispSettlementService = new IspSettlementService();

