// ILC Consistency Service
// Consistency law prototype: if ledger_state[D0] == reconcile(ledger_state[D1], D2, D3): maintain_integrity() else: invoke_meta_resolution()

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


export interface ConsistencyCheckResult {
  consistent: boolean;
  reconciledState: Record<string, unknown> | null;
  inconsistencies: string[];
  metaResolution?: Record<string, unknown>;
}

export class IlcConsistencyService {
  /**
   * Check consistency across dimensions
   * Formula: if ledger_state[D0] == reconcile(ledger_state[D1], D2, D3): maintain_integrity() else: invoke_meta_resolution()
   */
  async checkConsistency(ledgerId: string): Promise<ConsistencyCheckResult> {
    const ledger = await prisma.interdimensionalLedger.findUnique({
      where: { ledgerId },
      include: {
        dimensions: true,
      },
    });

    if (!ledger) {
      throw new Error(`Ledger not found: ${ledgerId}`);
    }

    // Get states from all dimensions
    const d0State = this.getDimensionState(ledger, 'D0');
    const d1State = this.getDimensionState(ledger, 'D1');
    const d2State = this.getDimensionState(ledger, 'D2');
    const d3State = this.getDimensionState(ledger, 'D3');

    // Reconcile states from D1, D2, D3
    const reconciledState = this.reconcileStates(d1State, d2State, d3State);

    // Check if D0 matches reconciled state
    const consistent = this.compareStates(d0State, reconciledState);

    const inconsistencies: string[] = [];
    if (!consistent) {
      inconsistencies.push('D0 state does not match reconciled state from D1, D2, D3');
    }

    let metaResolution: Record<string, unknown> | undefined;
    if (!consistent) {
      metaResolution = this.invokeMetaResolution(d0State, reconciledState);
    }

    // Create reconciliation record
    const reconciliationId = `ILC-REC-${uuidv4()}`;
    await prisma.dimensionReconciliation.create({
      data: {
        reconciliationId,
        ledgerId,
        dimensionStates: {
          D0: d0State,
          D1: d1State,
          D2: d2State,
          D3: d3State,
        },
        reconciledState: consistent ? reconciledState : null,
        consistencyCheck: consistent,
        metaResolution: metaResolution || null,
        status: consistent ? 'consistent' : 'inconsistent',
        checkedAt: new Date(),
      },
    });

    return {
      consistent,
      reconciledState: consistent ? reconciledState : null,
      inconsistencies,
      metaResolution,
    };
  }

  /**
   * Get state for a dimension
   */
  private getDimensionState(ledger: any, dimensionCode: string): Record<string, unknown> {
    const dimension = ledger.dimensions.find((d: any) => d.dimensionCode === dimensionCode);
    if (!dimension) {
      return {};
    }

    // In production, would retrieve actual ledger state
    // For now, use ledger state if available
    return (ledger.ledgerState as Record<string, unknown>) || {};
  }

  /**
   * Reconcile states from multiple dimensions
   */
  private reconcileStates(
    d1State: Record<string, unknown>,
    d2State: Record<string, unknown>,
    d3State: Record<string, unknown>
  ): Record<string, unknown> {
    // In production, would use sophisticated reconciliation algorithm
    // For now, merge states with priority: D1 > D2 > D3
    return {
      ...d3State,
      ...d2State,
      ...d1State,
      reconciled: true,
      timestamp: new Date().toISOString(),
    };
  }

  /**
   * Compare two states
   */
  private compareStates(
    state1: Record<string, unknown>,
    state2: Record<string, unknown>
  ): boolean {
    // Simple comparison (in production, would be more sophisticated)
    const keys1 = Object.keys(state1).sort();
    const keys2 = Object.keys(state2).sort();

    if (keys1.length !== keys2.length) {
      return false;
    }

    for (const key of keys1) {
      if (state1[key] !== state2[key]) {
        return false;
      }
    }

    return true;
  }

  /**
   * Invoke meta-resolution for inconsistent states
   */
  private invokeMetaResolution(
    d0State: Record<string, unknown>,
    reconciledState: Record<string, unknown>
  ): Record<string, unknown> {
    // In production, would use sophisticated resolution algorithm
    // For now, return resolution strategy
    return {
      resolutionType: 'meta_resolution',
      strategy: 'merge_with_priority',
      priority: 'D0',
      resolution: {
        useD0AsPrimary: true,
        mergeReconciled: true,
      },
      timestamp: new Date().toISOString(),
    };
  }

  /**
   * Maintain integrity (when consistent)
   */
  async maintainIntegrity(ledgerId: string) {
    const ledger = await prisma.interdimensionalLedger.findUnique({
      where: { ledgerId },
    });

    if (!ledger) {
      throw new Error(`Ledger not found: ${ledgerId}`);
    }

    // Update ledger status
    return prisma.interdimensionalLedger.update({
      where: { ledgerId },
      data: {
        status: 'synchronized',
        lastSyncAt: new Date(),
      },
    });
  }

  /**
   * Get reconciliation records
   */
  async getReconciliations(ledgerId: string) {
    return prisma.dimensionReconciliation.findMany({
      where: { ledgerId },
      orderBy: {
        checkedAt: 'desc',
      },
    });
  }
}

export const ilcConsistencyService = new IlcConsistencyService();

