// SRI Enforcement Service
// Automatic liquidity requirements, FX stabilization

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';
import { treasuryService } from '@/core/treasury/treasury.service';
import { accountService } from '@/core/accounts/account.service';


export class SRIEnforcementService {
  /**
   * Create enforcement based on trigger level
   */
  async createEnforcement(sriId: string, sovereignBankId: string, triggerLevel: string) {
    const enforcementType = this.getEnforcementType(triggerLevel);
    const action = this.getEnforcementAction(triggerLevel, enforcementType);

    const enforcement = await prisma.sri_enforcements.create({
      data: {
        id: uuidv4(),
        sriId,
        sovereignBankId,
        triggerLevel,
        enforcementType,
        action,
        status: 'active',
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    // Execute enforcement actions
    await this.executeEnforcement(enforcement.id, enforcementType, sovereignBankId);

    return enforcement;
  }

  /**
   * Execute enforcement actions
   */
  private async executeEnforcement(
    enforcementId: string,
    enforcementType: string,
    sovereignBankId: string
  ) {
    switch (enforcementType) {
      case 'liquidity_requirement':
        await this.enforceLiquidityRequirement(sovereignBankId);
        break;
      case 'fx_stabilization':
        await this.enforceFXStabilization(sovereignBankId);
        break;
      case 'enhanced_monitoring':
        await this.enableEnhancedMonitoring(sovereignBankId);
        break;
      case 'crisis_protocol':
        await this.activateCrisisProtocol(sovereignBankId);
        break;
      case 'liquidity_injection':
        await this.executeLiquidityInjection(sovereignBankId);
        break;
      case 'settlement_restriction':
        await this.imposeSettlementRestrictions(sovereignBankId);
        break;
    }

    // Mark as executed
    await prisma.sri_enforcements.update({
      where: { id: enforcementId },
      data: {
        status: 'executed',
        executedAt: new Date(),
      },
    });
  }

  /**
   * Enforce increased liquidity requirements
   */
  private async enforceLiquidityRequirement(sovereignBankId: string) {
    const accounts = await accountService.getAccountsBySovereign(sovereignBankId);
    
    // Increase reserve requirements by 20%
    for (const account of accounts) {
      if (account.reserveRequirement) {
        const currentReserve = parseFloat(account.reserveRequirement);
        const newReserve = currentReserve * 1.2;
        
        await prisma.bank_accounts.update({
          where: { id: account.id },
          data: {
            reserveRequirement: new Decimal(newReserve.toString()),
          },
        });
      }
    }
  }

  /**
   * Enforce FX stabilization measures
   */
  private async enforceFXStabilization(sovereignBankId: string) {
    // In production, this would:
    // - Set FX trading limits
    // - Require pre-approval for large FX trades
    // - Impose FX position limits
    
    // For now, log the action
    await prisma.audit_logs.create({
      data: {
        id: uuidv4(),
        eventType: 'sri_enforcement',
        entityType: 'sovereign_bank',
        entityId: sovereignBankId,
        action: 'fx_stabilization_imposed',
        details: {
          enforcementType: 'fx_stabilization',
          timestamp: new Date(),
        },
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });
  }

  /**
   * Enable enhanced monitoring
   */
  private async enableEnhancedMonitoring(sovereignBankId: string) {
    // In production, this would:
    // - Increase monitoring frequency
    // - Add additional compliance checks
    // - Require more frequent reporting
    
    await prisma.audit_logs.create({
      data: {
        id: uuidv4(),
        eventType: 'sri_enforcement',
        entityType: 'sovereign_bank',
        entityId: sovereignBankId,
        action: 'enhanced_monitoring_enabled',
        details: {
          enforcementType: 'enhanced_monitoring',
          timestamp: new Date(),
        },
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });
  }

  /**
   * Activate crisis protocol
   */
  private async activateCrisisProtocol(sovereignBankId: string) {
    // Find appropriate crisis protocol
    const protocol = await prisma.crisis_protocols.findFirst({
      where: {
        crisisType: 'liquidity_freeze',
        status: 'active',
      },
    });

    if (protocol) {
      await prisma.crisis_protocols.update({
        where: { id: protocol.id },
        data: {
          activatedAt: new Date(),
        },
      });
    }
  }

  /**
   * Execute liquidity injection
   */
  private async executeLiquidityInjection(sovereignBankId: string) {
    // In production, this would:
    // - Transfer liquidity from DBIS reserves
    // - Create emergency credit line
    // - Execute emergency funding
    
    await prisma.audit_logs.create({
      data: {
        id: uuidv4(),
        eventType: 'sri_enforcement',
        entityType: 'sovereign_bank',
        entityId: sovereignBankId,
        action: 'liquidity_injection_executed',
        details: {
          enforcementType: 'liquidity_injection',
          timestamp: new Date(),
        },
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });
  }

  /**
   * Impose settlement restrictions
   */
  private async imposeSettlementRestrictions(sovereignBankId: string) {
    // In production, this would:
    // - Limit settlement amounts
    // - Require additional approvals
    // - Delay non-critical settlements
    
    await prisma.audit_logs.create({
      data: {
        id: uuidv4(),
        eventType: 'sri_enforcement',
        entityType: 'sovereign_bank',
        entityId: sovereignBankId,
        action: 'settlement_restrictions_imposed',
        details: {
          enforcementType: 'settlement_restriction',
          timestamp: new Date(),
        },
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });
  }

  /**
   * Get enforcement type from trigger level
   */
  private getEnforcementType(triggerLevel: string): string {
    if (triggerLevel === 'sri_60') {
      return 'crisis_protocol';
    } else if (triggerLevel === 'sri_40') {
      return 'liquidity_requirement';
    }
    return 'enhanced_monitoring';
  }

  /**
   * Get enforcement action description
   */
  private getEnforcementAction(triggerLevel: string, enforcementType: string): string {
    const actions: Record<string, string> = {
      sri_40: 'SRI > 40: Increased liquidity requirements, FX stabilization measures, enhanced monitoring',
      sri_60: 'SRI > 60: Crisis protocols activated, mandatory liquidity injections, possible settlement restrictions',
    };

    return actions[triggerLevel] || `Enforcement: ${enforcementType}`;
  }

  /**
   * Resolve enforcement
   */
  async resolveEnforcement(enforcementId: string) {
    return await prisma.sri_enforcements.update({
      where: { id: enforcementId },
      data: {
        status: 'resolved',
        resolvedAt: new Date(),
      },
    });
  }

  /**
   * Get active enforcements for a bank
   */
  async getActiveEnforcements(sovereignBankId: string) {
    return await prisma.sri_enforcements.findMany({
      where: {
        sovereignBankId,
        status: {
          in: ['active', 'executed'],
        },
      },
      include: {
        sri: true,
      },
      orderBy: { createdAt: 'desc' },
    });
  }
}

export const sriEnforcementService = new SRIEnforcementService();

