// Chrono-Sovereign Settlement Engine (CSSE) Service
// Main CSSE engine for temporal settlement

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { cssePrecommitService } from './csse-precommit.service';
import { csseCommitService } from './csse-commit.service';
import { csseReconciliationService } from './csse-reconciliation.service';


export interface CreateChronoSettlementRequest {
  sourceBankId: string;
  destinationBankId: string;
  amount: number;
  currencyCode: string;
  assetType: string;
  timeDomain: 'earth' | 'lunar' | 'martian' | 'relativistic';
  timeOffset: number; // Time offset in seconds
}

export class CsseEngineService {
  /**
   * Create chrono-sovereign settlement
   */
  async createSettlement(request: CreateChronoSettlementRequest) {
    const settlementId = `CSSE-${uuidv4()}`;

    const settlement = await prisma.chronoSettlement.create({
      data: {
        settlementId,
        sourceBankId: request.sourceBankId,
        destinationBankId: request.destinationBankId,
        amount: new Decimal(request.amount),
        currencyCode: request.currencyCode,
        assetType: request.assetType,
        timeDomain: request.timeDomain,
        timeOffset: new Decimal(request.timeOffset),
        status: 'pre_commit',
      },
    });

    // Create pre-commit
    await cssePrecommitService.createPreCommit(settlementId, {
      predictedState: {
        amount: request.amount,
        currencyCode: request.currencyCode,
        timeDomain: request.timeDomain,
        estimatedArrival: new Date(Date.now() + request.timeOffset * 1000).toISOString(),
      },
    });

    return settlement;
  }

  /**
   * Get settlement by ID
   */
  async getSettlement(settlementId: string) {
    const settlement = await prisma.chronoSettlement.findUnique({
      where: { settlementId },
      include: {
        sourceBank: true,
        destinationBank: true,
        preCommits: true,
        reconciliations: true,
      },
    });

    if (!settlement) {
      throw new Error(`Settlement not found: ${settlementId}`);
    }

    return settlement;
  }

  /**
   * Execute settlement (pre-commit -> commit -> reconciliation -> settled)
   */
  async executeSettlement(settlementId: string) {
    const settlement = await prisma.chronoSettlement.findUnique({
      where: { settlementId },
      include: {
        preCommits: true,
      },
    });

    if (!settlement) {
      throw new Error(`Settlement not found: ${settlementId}`);
    }

    // Step 1: Verify pre-commit
    const preCommit = settlement.preCommits[0];
    if (!preCommit || preCommit.status !== 'verified') {
      throw new Error('Pre-commit not verified');
    }

    // Step 2: Commit
    await csseCommitService.commitSettlement(settlementId);

    // Step 3: Wait for actual state (simulated by time offset)
    // In production, would wait for actual message arrival

    // Step 4: Reconcile
    const reconciliation = await csseReconciliationService.createReconciliation(settlementId, {
      delayCost: 0, // Would calculate based on time offset
      fxDrift: 0, // Would calculate based on FX changes
      commodityShockDelta: 0, // Would calculate based on commodity changes
    });

    // Step 5: Apply reconciliation and mark as settled
    await csseReconciliationService.applyReconciliation(reconciliation.reconciliationId);

    // Update settlement status
    return prisma.chronoSettlement.update({
      where: { settlementId },
      data: {
        status: 'settled',
        settledAt: new Date(),
      },
    });
  }

  /**
   * Get settlements
   */
  async getSettlements(filters?: {
    sourceBankId?: string;
    destinationBankId?: string;
    status?: string;
    timeDomain?: string;
  }) {
    const where: Record<string, unknown> = {};

    if (filters?.sourceBankId) {
      where.sourceBankId = filters.sourceBankId;
    }
    if (filters?.destinationBankId) {
      where.destinationBankId = filters.destinationBankId;
    }
    if (filters?.status) {
      where.status = filters.status;
    }
    if (filters?.timeDomain) {
      where.timeDomain = filters.timeDomain;
    }

    return prisma.chronoSettlement.findMany({
      where,
      include: {
        sourceBank: true,
        destinationBank: true,
        _count: {
          select: {
            preCommits: true,
            reconciliations: true,
          },
        },
      },
      orderBy: {
        createdAt: 'desc',
      },
    });
  }
}

export const csseEngineService = new CsseEngineService();

