// Omega Layer Service
// Ω0-Ω4 layer management and MERGE operations

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


export interface CreateLayerRequest {
  layerNumber: number;
  layerName: string;
  description: string;
}

export interface MergeStateRequest {
  primeState?: Record<string, unknown>;
  quantumState?: Record<string, unknown>;
  holographicState?: Record<string, unknown>;
  parallelState?: Record<string, unknown>;
  temporalState?: Record<string, unknown>;
}

export interface MergeResult {
  mergedState: Record<string, unknown>;
  consistencyStatus: string;
}

export class OmegaLayerService {
  /**
   * Create an Omega layer
   */
  async createLayer(request: CreateLayerRequest): Promise<OmegaLayerState> {
    const layerId = `OMEGA-${uuidv4()}`;

    const layer = await prisma.omega_layers.create({
      data: {
        layerId,
        layerNumber: request.layerNumber,
        layerName: request.layerName,
        description: request.description,
        status: 'active',
      },
    });

    return {
      stateId: '', // Not a state, this is a layer
      layerId: layer.layerId,
      layerNumber: layer.layerNumber,
      layerName: layer.layerName,
      stateHash: '',
      stateData: {},
      consistencyStatus: 'pending',
      timestamp: layer.createdAt,
    } as any; // Type cast for compatibility
  }

  /**
   * Get all layers
   */
  async getAllLayers(): Promise<Array<{
    layerId: string;
    layerNumber: number;
    layerName: string;
    description: string;
    status: string;
  }>> {
    const layers = await prisma.omega_layers.findMany({
      where: { status: 'active' },
      orderBy: { layerNumber: 'asc' },
    });

    return layers.map((layer) => ({
      layerId: layer.layerId,
      layerNumber: layer.layerNumber,
      layerName: layer.layerName,
      description: layer.description,
      status: layer.status,
    }));
  }

  /**
   * Get layer by number
   */
  async getLayerByNumber(layerNumber: number): Promise<{
    layerId: string;
    layerNumber: number;
    layerName: string;
    description: string;
  } | null> {
    const layer = await prisma.omega_layers.findFirst({
      where: {
        layerNumber,
        status: 'active',
      },
    });

    if (!layer) {
      return null;
    }

    return {
      layerId: layer.layerId,
      layerNumber: layer.layerNumber,
      layerName: layer.layerName,
      description: layer.description,
    };
  }

  /**
   * MERGE all layer states
   * Ω_state = MERGE(prime_state, quantum_state, holographic_state, parallel_state, temporal_state)
   */
  async mergeStates(request: MergeStateRequest): Promise<MergeResult> {
    // Perform MERGE operation
    // In production, this would use sophisticated reconciliation algorithms
    const mergedState: Record<string, unknown> = {
      timestamp: new Date().toISOString(),
      layers: {},
    };

    // Merge each state layer
    if (request.primeState) {
      mergedState.identity_layers = { ...mergedState.identity_layers, prime: request.primeState };
    }
    if (request.quantumState) {
      mergedState.identity_layers = { ...mergedState.identity_layers, quantum: request.quantumState };
    }
    if (request.holographicState) {
      mergedState.identity_layers = { ...mergedState.identity_layers, holographic: request.holographicState };
    }
    if (request.parallelState) {
      mergedState.identity_layers = { ...mergedState.identity_layers, parallel: request.parallelState };
    }
    if (request.temporalState) {
      mergedState.identity_layers = { ...mergedState.identity_layers, temporal: request.temporalState };
    }

    // Check consistency
    const consistencyStatus = this.checkConsistency(
      request.primeState,
      request.quantumState,
      request.holographicState,
      request.parallelState,
      request.temporalState
    );

    // Create Omega state record
    const stateId = `OMEGA-STATE-${uuidv4()}`;
    const stateHash = this.calculateStateHash(mergedState);

    await prisma.omegaState.create({
      data: {
        stateId,
        layerId: '', // Global state, not layer-specific
        stateHash,
        stateData: mergedState,
        primeState: request.primeState || {},
        quantumState: request.quantumState || {},
        holographicState: request.holographicState || {},
        parallelState: request.parallelState || {},
        temporalState: request.temporalState || {},
        mergedState,
        consistencyStatus,
        timestamp: new Date(),
      },
    });

    return {
      mergedState,
      consistencyStatus,
    };
  }

  /**
   * Check consistency across layers
   */
  private checkConsistency(
    primeState?: Record<string, unknown>,
    quantumState?: Record<string, unknown>,
    holographicState?: Record<string, unknown>,
    parallelState?: Record<string, unknown>,
    temporalState?: Record<string, unknown>
  ): string {
    // Simplified consistency check
    // In production, would perform deep consistency validation
    const states = [
      primeState,
      quantumState,
      holographicState,
      parallelState,
      temporalState,
    ].filter(s => s !== undefined);

    if (states.length === 0) {
      return 'pending';
    }

    // Check for basic consistency (simplified)
    // In reality, would check for conflicts, contradictions, etc.
    return 'consistent';
  }

  /**
   * Calculate state hash
   */
  private calculateStateHash(state: Record<string, unknown>): string {
    // Simplified hash calculation
    // In production, would use cryptographic hash
    const stateString = JSON.stringify(state);
    return `HASH-${Buffer.from(stateString).toString('base64').substring(0, 32)}`;
  }

  /**
   * Initialize default Omega layers
   */
  async initializeDefaultLayers(): Promise<void> {
    const defaultLayers: CreateLayerRequest[] = [
      {
        layerNumber: 0,
        layerName: 'Ω0: Prime Ledger Layer',
        description: 'Canonical ground-truth settlement',
      },
      {
        layerNumber: 1,
        layerName: 'Ω1: Quantum Ledger Layer',
        description: 'GQL entangled settlement',
      },
      {
        layerNumber: 2,
        layerName: 'Ω2: Holographic Simulation Layer',
        description: 'Simulated monetary projections',
      },
      {
        layerNumber: 3,
        layerName: 'Ω3: Parallel-State Ledger Layer',
        description: 'Alternate sovereign outcomes',
      },
      {
        layerNumber: 4,
        layerName: 'Ω4: Temporal Ledger Layer',
        description: 'Past/future reconciliations',
      },
    ];

    for (const layerData of defaultLayers) {
      const existing = await prisma.omega_layers.findFirst({
        where: { layerNumber: layerData.layerNumber },
      });

      if (!existing) {
        await this.createLayer(layerData);
      }
    }
  }
}

