// DBIS Quantum-Temporal Arbitration Engine - Resolution Service
// Rollback and consistency restoration

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { qtaeDetectionService } from './qtae-detection.service';


export interface CreateRollbackRequest {
  arbitrationId: string;
  targetState: Record<string, unknown>;
  rollbackReason: string;
  rollbackScope: Record<string, unknown>;
}

export class QtaeResolutionService {
  /**
   * Create consistency rollback
   */
  async createRollback(request: CreateRollbackRequest) {
    const arbitration = await qtaeDetectionService.getArbitration(request.arbitrationId);
    if (!arbitration) {
      throw new Error(`Arbitration not found: ${request.arbitrationId}`);
    }

    const rollbackId = `RB-${uuidv4()}`;

    const rollback = await prisma.consistency_rollbacks.create({
      data: {
        rollbackId,
        arbitrationId: request.arbitrationId,
        targetState: request.targetState,
        rollbackReason: request.rollbackReason,
        rollbackScope: request.rollbackScope,
        status: 'pending',
      },
    });

    return rollback;
  }

  /**
   * Execute rollback
   */
  async executeRollback(rollbackId: string) {
    const rollback = await prisma.consistency_rollbacks.findUnique({
      where: { rollbackId },
      include: {
        quantum_temporal_arbitrations: true,
      },
    });

    if (!rollback) {
      throw new Error(`Rollback not found: ${rollbackId}`);
    }

    if (rollback.status !== 'pending') {
      throw new Error(`Rollback already ${rollback.status}`);
    }

    // Update status to executing
    await prisma.consistency_rollbacks.update({
      where: { rollbackId },
      data: { status: 'executing' },
    });

    try {
      // In production, this would:
      // - Rollback to target state
      // - Restore consistency
      // - Update all affected systems

      // Simulate rollback
      await new Promise((resolve) => setTimeout(resolve, 100));

      // Mark as completed
      await prisma.consistency_rollbacks.update({
        where: { rollbackId },
        data: {
          status: 'completed',
          executedAt: new Date(),
        },
      });

      // Mark contradictions as resolved
      await prisma.contradiction_events.updateMany({
        where: {
          arbitrationId: rollback.arbitrationId,
          resolved: false,
        },
        data: {
          resolved: true,
          resolvedAt: new Date(),
          resolutionMethod: 'rollback',
        },
      });

      return rollback;
    } catch (error) {
      await prisma.consistency_rollbacks.update({
        where: { rollbackId },
        data: { status: 'failed' },
      });
      throw error;
    }
  }

  /**
   * Get rollback by ID
   */
  async getRollback(rollbackId: string) {
    return await prisma.consistency_rollbacks.findUnique({
      where: { rollbackId },
      include: {
        quantum_temporal_arbitrations: true,
      },
    });
  }

  /**
   * Get rollbacks for arbitration
   */
  async getRollbacksForArbitration(arbitrationId: string) {
    return await prisma.consistency_rollbacks.findMany({
      where: { arbitrationId },
      orderBy: { createdAt: 'desc' },
    });
  }

  /**
   * Get pending rollbacks
   */
  async getPendingRollbacks() {
    return await prisma.consistency_rollbacks.findMany({
      where: { status: 'pending' },
      orderBy: { createdAt: 'asc' },
    });
  }

  /**
   * Rollback to consistent state
   * Logic: if contradiction_detected: rollback_to_consistent_state()
   */
  async rollbackToConsistentState(arbitrationId: string) {
    const arbitration = await qtaeDetectionService.getArbitration(arbitrationId);
    if (!arbitration) {
      throw new Error(`Arbitration not found: ${arbitrationId}`);
    }

    const contradictions = await qtaeDetectionService.getContradictions(arbitrationId);
    const unresolved = contradictions.filter((c) => !c.resolved);

    if (unresolved.length === 0) {
      return {
        message: 'No contradictions to resolve',
        rollbackId: null,
      };
    }

    // Determine target state (in production, this would be calculated)
    const targetState = {
      consistent: true,
      timestamp: new Date().toISOString(),
    };

    const rollback = await this.createRollback({
      arbitrationId,
      targetState,
      rollbackReason: `Resolving ${unresolved.length} contradictions`,
      rollbackScope: {
        contradictions: unresolved.map((c) => c.eventId),
      },
    });

    await this.executeRollback(rollback.rollbackId);

    return {
      rollbackId: rollback.rollbackId,
      contradictionsResolved: unresolved.length,
    };
  }
}

export const qtaeResolutionService = new QtaeResolutionService();

