// CSSE Commit Service
// Commit phase execution

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


export class CsseCommitService {
  /**
   * Commit settlement
   */
  async commitSettlement(settlementId: string) {
    const settlement = await prisma.chrono_settlements.findUnique({
      where: { settlementId },
      include: {
        preCommits: true,
      },
    });

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

    // Verify pre-commit is committed
    const preCommit = settlement.preCommits.find((pc) => pc.status === 'committed');
    if (!preCommit) {
      throw new Error('Pre-commit must be committed before settlement commit');
    }

    // In production, this would:
    // 1. Verify actual state matches predicted state thresholds
    // 2. Execute settlement on both ledgers
    // 3. Create commitment records

    // Update settlement status
    return prisma.chrono_settlements.update({
      where: { settlementId },
      data: {
        status: 'committed',
        committedAt: new Date(),
      },
    });
  }

  /**
   * Verify commit
   */
  async verifyCommit(settlementId: string, actualState: Record<string, unknown>) {
    const settlement = await prisma.chrono_settlements.findUnique({
      where: { settlementId },
      include: {
        preCommits: true,
      },
    });

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

    const preCommit = settlement.preCommits[0];
    if (!preCommit) {
      throw new Error('Pre-commit not found');
    }

    // Verify actual state matches predicted state (within thresholds)
    const predictedState = preCommit.predictedState as Record<string, unknown>;
    const predictedAmount = predictedState.amount as number;
    const actualAmount = actualState.amount as number;

    // Allow small variance (0.1%)
    const variance = Math.abs(actualAmount - predictedAmount) / predictedAmount;
    if (variance > 0.001) {
      throw new Error(`Actual state does not match predicted state: variance ${variance}`);
    }

    return {
      verified: true,
      variance,
    };
  }
}

export const csseCommitService = new CsseCommitService();

