// Federated AI Service
// Federated AI for risk/compliance tasks

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { dscmNodeManagerService } from './dscm-node-manager.service';


export interface FederatedAiRequest {
  aiType: string; // risk_analysis, compliance_check, threat_detection
  taskPayload: Record<string, unknown>;
  participatingNodeIds?: string[];
}

export class FederatedAiService {
  /**
   * Execute federated AI task
   */
  async executeFederatedAiTask(request: FederatedAiRequest) {
    // Get participating nodes
    let nodeIds: string[];
    if (request.participatingNodeIds && request.participatingNodeIds.length > 0) {
      nodeIds = request.participatingNodeIds;
    } else {
      // Get all active nodes for federated computation
      const nodes = await prisma.dscmNode.findMany({
        where: {
          status: 'active',
          nodeType: {
            in: ['SEN', 'CEN'], // Use Sovereign Execution Nodes and Compliance Execution Nodes
          },
        },
        take: 5, // Limit to 5 nodes for federated task
      });
      nodeIds = nodes.map((n) => n.nodeId);
    }

    if (nodeIds.length === 0) {
      throw new Error('No nodes available for federated AI task');
    }

    // Create federated AI task on primary node
    const primaryNodeId = nodeIds[0];
    const taskId = `FED-AI-${uuidv4()}`;

    const task = await prisma.federatedAiTask.create({
      data: {
        taskId,
        nodeId: primaryNodeId,
        aiType: request.aiType,
        taskPayload: request.taskPayload,
        federatedNodes: nodeIds,
        status: 'running',
        startedAt: new Date(),
      },
    });

    // In production, would distribute task across nodes and wait for consensus
    // For now, simulate consensus result
    const consensusResult = await this.reachConsensus(taskId, nodeIds);

    await prisma.federatedAiTask.update({
      where: { taskId },
      data: {
        status: 'consensus_reached',
        consensusResult,
        consensusReachedAt: new Date(),
      },
    });

    return task;
  }

  /**
   * Reach consensus across federated nodes
   */
  private async reachConsensus(
    taskId: string,
    nodeIds: string[]
  ): Promise<Record<string, unknown>> {
    // Simulate consensus algorithm
    // In production, would collect results from all nodes and apply consensus logic
    return {
      consensusType: 'majority',
      participatingNodes: nodeIds,
      consensusReached: true,
      result: {},
    };
  }

  /**
   * Get federated AI task
   */
  async getTask(taskId: string) {
    return await prisma.federatedAiTask.findUnique({
      where: { taskId },
      include: {
        node: true,
      },
    });
  }

  /**
   * Get tasks by AI type
   */
  async getTasksByAiType(aiType: string) {
    return await prisma.federatedAiTask.findMany({
      where: {
        aiType,
      },
      orderBy: {
        startedAt: 'desc',
      },
    });
  }
}

export const federatedAiService = new FederatedAiService();

