// MRLI Sync Service
// State merge: MERGE(classical_state, dlt_state, quantum_state, simulated_state)

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { mrliConflictService } from './mrli-conflict.service';


export interface SyncRequest {
  ledgerId: string;
  classicalState?: Record<string, unknown>;
  dltState?: Record<string, unknown>;
  quantumState?: Record<string, unknown>;
  simulatedState?: Record<string, unknown>;
}

export interface SyncResult {
  syncId: string;
  mergedState: Record<string, unknown>;
  conflictDetected: boolean;
  status: string;
}

export class MrliSyncService {
  /**
   * Synchronize multi-reality ledger states
   * Formula: MERGE(classical_state, dlt_state, quantum_state, simulated_state)
   */
  async synchronize(request: SyncRequest): Promise<SyncResult> {
    const syncId = `MRLI-SYNC-${uuidv4()}`;

    // Merge states
    const mergedState = this.mergeStates(
      request.classicalState,
      request.dltState,
      request.quantumState,
      request.simulatedState
    );

    // Check for conflicts
    const conflictDetected = await this.detectConflicts(
      request.classicalState,
      request.dltState,
      request.quantumState,
      request.simulatedState
    );

    const sync = await prisma.mrli_synchronizations.create({
      data: {
        syncId,
        ledgerId: request.ledgerId,
        classicalState: request.classicalState || null,
        dltState: request.dltState || null,
        quantumState: request.quantumState || null,
        simulatedState: request.simulatedState || null,
        mergedState,
        conflictDetected,
        status: conflictDetected ? 'conflict' : 'pending',
      },
    });

    // If conflict detected, resolve it
    if (conflictDetected) {
      const resolution = await mrliConflictService.resolveConflict(syncId);
      await prisma.mrli_synchronizations.update({
        where: { syncId },
        data: {
          conflictResolution: resolution,
          resolutionMethod: 'sovereign_trust_graph',
          status: 'resolved',
          resolvedAt: new Date(),
        },
      });
    } else {
      // Update ledger with merged state
      await prisma.multi_reality_ledgers.update({
        where: { ledgerId: request.ledgerId },
        data: {
          mergedState,
          lastSyncAt: new Date(),
          status: 'active',
        },
      });

      await prisma.mrli_synchronizations.update({
        where: { syncId },
        data: {
          status: 'merged',
          syncedAt: new Date(),
        },
      });
    }

    return {
      syncId: sync.syncId,
      mergedState,
      conflictDetected,
      status: conflictDetected ? 'resolved' : 'merged',
    };
  }

  /**
   * Merge states from different interfaces
   */
  private mergeStates(
    classicalState?: Record<string, unknown>,
    dltState?: Record<string, unknown>,
    quantumState?: Record<string, unknown>,
    simulatedState?: Record<string, unknown>
  ): Record<string, unknown> {
    const merged: Record<string, unknown> = {};

    // Priority order: quantum > dlt > classical > simulated
    if (quantumState) {
      Object.assign(merged, quantumState);
    }
    if (dltState) {
      Object.assign(merged, dltState);
    }
    if (classicalState) {
      Object.assign(merged, classicalState);
    }
    if (simulatedState) {
      Object.assign(merged, simulatedState);
    }

    return merged;
  }

  /**
   * Detect conflicts between states
   */
  private async detectConflicts(
    classicalState?: Record<string, unknown>,
    dltState?: Record<string, unknown>,
    quantumState?: Record<string, unknown>,
    simulatedState?: Record<string, unknown>
  ): Promise<boolean> {
    // Simple conflict detection: check for key-value mismatches
    const states = [classicalState, dltState, quantumState, simulatedState].filter(
      (s) => s !== undefined
    );

    if (states.length < 2) {
      return false;
    }

    // Check for conflicting values
    const keys = new Set<string>();
    states.forEach((state) => {
      if (state) {
        Object.keys(state).forEach((key) => keys.add(key));
      }
    });

    for (const key of keys) {
      const values = states
        .map((state) => (state ? state[key] : undefined))
        .filter((v) => v !== undefined);

      if (values.length > 1) {
        // Check if all values are the same
        const firstValue = JSON.stringify(values[0]);
        const allSame = values.every((v) => JSON.stringify(v) === firstValue);

        if (!allSame) {
          return true; // Conflict detected
        }
      }
    }

    return false;
  }

  /**
   * Get synchronization
   */
  async getSync(syncId: string) {
    return await prisma.mrli_synchronizations.findUnique({
      where: { syncId },
      include: {
        ledger: true,
      },
    });
  }

  /**
   * List synchronizations
   */
  async listSyncs(ledgerId?: string) {
    return await prisma.mrli_synchronizations.findMany({
      where: ledgerId ? { ledgerId } : undefined,
      orderBy: { createdAt: 'desc' },
    });
  }
}

export const mrliSyncService = new MrliSyncService();

