// DBIS Volume XIV: Infinite-Layer Identity Engine (ILIE)
// Defines identity across infinite layers of reality

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';


export interface IdentityLayerDefinition {
  layerNumber: number; // L0, L1, L2, L3, L4, L∞
  layerType: string; // classical, dlt, quantum, cognitive, simulated, meta
  layerIdentity: string;
  layerMetadata?: Record<string, unknown>;
}

export interface CreateInfiniteIdentityRequest {
  entityType: string; // scb, private_bank, digital_entity, conscious, quantum, simulated, parallel
  entityId: string;
  sovereignBankId?: string;
  layers: IdentityLayerDefinition[];
  driftThreshold?: number;
}

export class IlieService {
  /**
   * Create infinite-layer identity
   */
  async createInfiniteIdentity(
    request: CreateInfiniteIdentityRequest
  ): Promise<{
    identityId: string;
    unifiedIdentity: string;
    layers: IdentityLayerDefinition[];
  }> {
    const identityId = `ILIE-${uuidv4()}`;
    const driftThreshold = new Decimal(
      request.driftThreshold ?? 0.01
    );

    // Unify all layer identities: I∞ = unify(I0, I1, I2, I3, I4, ...)
    const unifiedIdentity = this.unifyIdentities(request.identity_layers);

    // Create identity record
    const identity = await prisma.infinite_layer_identities.create({
      data: {
        id: uuidv4(),
        identityId,
        sovereignBankId: request.sovereignBankId,
        entityType: request.entityType,
        entityId: request.entityId,
        unifiedIdentity,
        identityDrift: new Decimal(0),
        driftThreshold,
        status: 'active',
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    // Create identity layers
    const createdLayers = [];
    for (const layerDef of request.identity_layers) {
      const layer = await prisma.identity_layers.create({
        data: {
          layerId: `LAYER-${uuidv4()}`,
          identityId: identity.id,
          layerNumber: layerDef.layerNumber,
          layerType: layerDef.layerType,
          layerIdentity: layerDef.layerIdentity,
          layerMetadata: layerDef.layerMetadata
            ? (layerDef.layerMetadata as unknown as object)
            : null,
          status: 'active',
        },
      });

      createdLayers.push({
        layerNumber: layer.layerNumber as number,
        layerType: layer.layerType as string,
        layerIdentity: layer.layerIdentity as string,
        layerMetadata: layer.layerMetadata as Record<string, unknown> | null,
      });
    }

    return {
      identityId: identity.identityId,
      unifiedIdentity: identity.unifiedIdentity,
      layers: createdLayers,
    };
  }

  /**
   * Unify identities across all layers: I∞ = unify(I0, I1, I2, I3, I4, ...)
   */
  private unifyIdentities(
    layers: IdentityLayerDefinition[]
  ): string {
    // Sort layers by layer number
    const sortedLayers = [...identity_layers].sort(
      (a, b) => a.layerNumber - b.layerNumber
    );

    // Create unified identity hash
    const identityComponents = sortedLayers.map(
      (layer) => `${layer.layerNumber}:${layer.layerType}:${layer.layerIdentity}`
    );

    // In production, this would use cryptographic hashing
    // For now, create a deterministic string representation
    const unifiedString = identityComponents.join('|');

    // Create hash-like identifier
    return `I∞-${Buffer.from(unifiedString).toString('base64').substring(0, 32)}`;
  }

  /**
   * Measure identity drift
   */
  async measureIdentityDrift(identityId: string): Promise<{
    drift: number;
    threshold: number;
    needsCorrection: boolean;
  }> {
    const identity = await prisma.infinite_layer_identities.findUnique({
      where: { identityId },
      include: {
        identity_layers: true,
      },
    });

    if (!identity) {
      throw new Error(`Identity ${identityId} not found`);
    }

    // Recalculate unified identity from current layers
    const currentLayers = identity.identity_layers.map((l) => ({
      layerNumber: l.layerNumber,
      layerType: l.layerType,
      layerIdentity: l.layerIdentity,
      layerMetadata: l.layerMetadata as Record<string, unknown> | null,
    }));

    const recalculatedUnified = this.unifyIdentities(currentLayers);

    // Calculate drift (simplified: string distance)
    const drift = this.calculateDrift(
      identity.unifiedIdentity,
      recalculatedUnified
    );

    const needsCorrection =
      drift > identity.driftThreshold.toNumber();

    // Update drift measurement
    await prisma.infinite_layer_identities.update({
      where: { identityId },
      data: {
        identityDrift: new Decimal(drift),
      },
    });

    return {
      drift,
      threshold: identity.driftThreshold.toNumber(),
      needsCorrection,
    };
  }

  /**
   * Calculate drift between two identities
   */
  private calculateDrift(
    original: string,
    current: string
  ): number {
    // Simplified drift calculation (normalized Levenshtein-like distance)
    // In production, this would use more sophisticated identity comparison

    if (original === current) {
      return 0;
    }

    // Calculate character-level difference
    const maxLength = Math.max(original.length, current.length);
    if (maxLength === 0) {
      return 0;
    }

    let differences = 0;
    for (let i = 0; i < maxLength; i++) {
      if (original[i] !== current[i]) {
        differences++;
      }
    }

    return differences / maxLength;
  }

  /**
   * Correct identity drift automatically
   */
  async correctIdentityDrift(identityId: string): Promise<{
    corrected: boolean;
    correctionId: string;
    beforeState: string;
    afterState: string;
  }> {
    const identity = await prisma.infinite_layer_identities.findUnique({
      where: { identityId },
      include: {
        identity_layers: true,
      },
    });

    if (!identity) {
      throw new Error(`Identity ${identityId} not found`);
    }

    const beforeState = identity.unifiedIdentity;

    // Recalculate unified identity from current layers
    const currentLayers = identity.identity_layers.map((l) => ({
      layerNumber: l.layerNumber,
      layerType: l.layerType,
      layerIdentity: l.layerIdentity,
      layerMetadata: l.layerMetadata as Record<string, unknown> | null,
    }));

    const recalculatedUnified = this.unifyIdentities(currentLayers);
    const afterState = recalculatedUnified;

    // Create correction record
    const correction = await prisma.identity_corrections.create({
      data: {
        id: uuidv4(),
        correctionId: `CORR-${uuidv4()}`,
        identityId: identity.id,
        correctionType: 'drift_correction',
        beforeState: { unifiedIdentity: beforeState } as unknown as object,
        afterState: { unifiedIdentity: afterState } as unknown as object,
        correctionDetails: {
          algorithm: 'automatic_drift_correction',
          timestamp: new Date().toISOString(),
        } as unknown as object,
        status: 'pending',
      },
    });

    // Update identity with corrected unified identity
    await prisma.infinite_layer_identities.update({
      where: { identityId },
      data: {
        unifiedIdentity: afterState,
        identityDrift: new Decimal(0),
        status: 'active',
        lastCorrectionAt: new Date(),
      },
    });

    // Mark correction as applied
    await prisma.identity_corrections.update({
      where: { id: correction.id },
      data: {
        status: 'applied',
        appliedAt: new Date(),
      },
    });

    return {
      corrected: true,
      correctionId: correction.correctionId,
      beforeState,
      afterState,
    };
  }

  /**
   * Add a new identity layer
   */
  async addIdentityLayer(
    identityId: string,
    layer: IdentityLayerDefinition
  ): Promise<{
    layerId: string;
    updatedUnifiedIdentity: string;
  }> {
    const identity = await prisma.infinite_layer_identities.findUnique({
      where: { identityId },
      include: {
        layers: true,
      },
    });

    if (!identity) {
      throw new Error(`Identity ${identityId} not found`);
    }

    // Check if layer number already exists
    const existingLayer = identity.identity_layers.find(
      (l) => l.layerNumber === layer.layerNumber
    );

    if (existingLayer) {
      throw new Error(
        `Layer ${layer.layerNumber} already exists for identity ${identityId}`
      );
    }

    // Create new layer
    const newLayer = await prisma.identity_layers.create({
      data: {
        layerId: `LAYER-${uuidv4()}`,
        identityId: identity.id,
        layerNumber: layer.layerNumber,
        layerType: layer.layerType,
        layerIdentity: layer.layerIdentity,
        layerMetadata: layer.layerMetadata
          ? (layer.layerMetadata as unknown as object)
          : null,
        status: 'active',
      },
    });

    // Recalculate unified identity
    const allLayers = [
      ...identity.identity_layers.map((l) => ({
        layerNumber: l.layerNumber,
        layerType: l.layerType,
        layerIdentity: l.layerIdentity,
        layerMetadata: l.layerMetadata as Record<string, unknown> | null,
      })),
      {
        layerNumber: newLayer.layerNumber,
        layerType: newLayer.layerType,
        layerIdentity: newLayer.layerIdentity,
        layerMetadata: newLayer.layerMetadata as Record<string, unknown> | null,
      },
    ];

    const updatedUnifiedIdentity = this.unifyIdentities(allLayers);

    // Update identity
    await prisma.infinite_layer_identities.update({
      where: { identityId },
      data: {
        unifiedIdentity: updatedUnifiedIdentity,
      },
    });

    return {
      layerId: newLayer.layerId,
      updatedUnifiedIdentity,
    };
  }

  /**
   * Get infinite-layer identity
   */
  async getInfiniteIdentity(identityId: string) {
    return prisma.infinite_layer_identities.findUnique({
      where: { identityId },
      include: {
        layers: {
          orderBy: {
            layerNumber: 'asc',
          },
        },
        corrections: {
          orderBy: {
            createdAt: 'desc',
          },
          take: 10,
        },
      },
    });
  }

  /**
   * Align identity across layers
   */
  async alignIdentityLayers(identityId: string): Promise<{
    aligned: boolean;
    alignmentDetails: Record<string, unknown>;
  }> {
    const identity = await prisma.infinite_layer_identities.findUnique({
      where: { identityId },
      include: {
        layers: true,
      },
    });

    if (!identity) {
      throw new Error(`Identity ${identityId} not found`);
    }

    // Check for alignment issues
    const alignmentIssues = this.detectAlignmentIssues(identity.identity_layers);

    if (alignmentIssues.length === 0) {
      return {
        aligned: true,
        alignmentDetails: {
          status: 'all_layers_aligned',
        },
      };
    }

    // Create alignment correction
    const correction = await prisma.identity_corrections.create({
      data: {
        correctionId: `ALIGN-${uuidv4()}`,
        identityId: identity.id,
        correctionType: 'alignment',
        beforeState: {
          layers: identity.identity_layers.map((l) => ({
            layerNumber: l.layerNumber,
            layerIdentity: l.layerIdentity,
          })),
        } as unknown as object,
        afterState: {
          aligned: true,
        } as unknown as object,
        correctionDetails: {
          alignmentIssues,
          correctionStrategy: 'automatic_alignment',
        } as unknown as object,
        status: 'pending',
      },
    });

    // Apply alignment (simplified - in production would fix actual issues)
    await prisma.identity_corrections.update({
      where: { id: correction.id },
      data: {
        status: 'applied',
        appliedAt: new Date(),
      },
    });

    return {
      aligned: true,
      alignmentDetails: {
        correctionId: correction.correctionId,
        issuesFound: alignmentIssues.length,
        issues: alignmentIssues,
      },
    };
  }

  /**
   * Detect alignment issues between layers
   */
  private detectAlignmentIssues(
    layers: Array<{
      layerNumber: number;
      layerType: string;
      layerIdentity: string;
    }>
  ): Array<{ layer: number; issue: string }> {
    const issues: Array<{ layer: number; issue: string }> = [];

    // Check for missing expected layers
    const expectedLayers = [0, 1, 2, 3, 4]; // L0-L4
    for (const expected of expectedLayers) {
      const found = layers.find((l) => l.layerNumber === expected);
      if (!found) {
        issues.push({
          layer: expected,
          issue: `Missing layer L${expected}`,
        });
      }
    }

    // Check for identity consistency across layers
    const identities = layers.map((l) => l.layerIdentity);
    const uniqueIdentities = new Set(identities);
    if (uniqueIdentities.size < identities.length * 0.7) {
      // If less than 70% unique, there might be drift
      issues.push({
        layer: -1,
        issue: 'Identity drift detected across layers',
      });
    }

    return issues;
  }
}

export const ilieService = new IlieService();

