#!/usr/bin/env node
// ═══════════════════════════════════════════════════════════════════════════
// Infrastructure Drift Detection Engine
// Jämför Terraform-konfiguration med verklig AWS-miljö
// ═══════════════════════════════════════════════════════════════════════════

import { readFileSync } from 'fs';

class DriftDetectionEngine {
  constructor(terraformDir, discoveryDir) {
    this.terraformDir = terraformDir;
    this.discoveryDir = discoveryDir;
    this.findings = [];
  }

  /**
   * Ladda Terraform-resurser från .tf-filer
   */
  loadTerraformResources() {
    // TODO: Parsa .tf-filer (kräver HCL-parser)
    return {
      aws_instance: ['aamos-ledger'],
      aws_iam_role: ['ledger_ec2'],
      aws_security_group: ['ledger'],
      aws_secretsmanager_secret: ['ledger_jwt', 'ledger_internal', 'ledger_db', 'ledger_redis']
    };
  }

  /**
   * Ladda AWS-resurser från discovery JSON
   */
  loadAWSResources() {
    const resources = {};
    
    try {
      const ec2 = JSON.parse(readFileSync(`${this.discoveryDir}/ec2-instances.json`, 'utf8'));
      resources.ec2 = ec2.Reservations?.flatMap(r => r.Instances?.map(i => ({
        id: i.InstanceId,
        type: i.InstanceType,
        state: i.State?.Name,
        tags: i.Tags
      }))) || [];
    } catch {
      resources.ec2 = [];
    }
    
    try {
      const rds = JSON.parse(readFileSync(`${this.discoveryDir}/rds-instances.json`, 'utf8'));
      resources.rds = rds.DBInstances?.map(db => ({
        id: db.DBInstanceIdentifier,
        engine: db.Engine,
        status: db.DBInstanceStatus
      })) || [];
    } catch {
      resources.rds = [];
    }
    
    try {
      const sg = JSON.parse(readFileSync(`${this.discoveryDir}/security-groups.json`, 'utf8'));
      resources.security_groups = sg.SecurityGroups?.map(sg => ({
        id: sg.GroupId,
        name: sg.GroupName,
        description: sg.Description
      })) || [];
    } catch {
      resources.security_groups = [];
    }
    
    try {
      const secrets = JSON.parse(readFileSync(`${this.discoveryDir}/secrets.json`, 'utf8'));
      resources.secrets = secrets.SecretList?.map(s => ({
        name: s.Name,
        rotation: s.RotationEnabled
      })) || [];
    } catch {
      resources.secrets = [];
    }
    
    return resources;
  }

  /**
   * Detektera drift
   */
  detect() {
    const terraform = this.loadTerraformResources();
    const aws = this.loadAWSResources();
    
    // 1. Resurser i AWS som inte finns i Terraform
    for (const ec2 of aws.ec2) {
      const inTerraform = terraform.aws_instance?.some(name => 
        ec2.tags?.some(t => t.Key === 'Name' && t.Value.includes(name))
      );
      
      if (!inTerraform) {
        this.findings.push({
          type: 'DRIFT',
          severity: 'HIGH',
          category: 'Orphaned Resource',
          description: `EC2 ${ec2.id} finns i AWS men inte i Terraform`,
          terraform: null,
          aws: ec2,
          action: 'Import or remove'
        });
      }
    }
    
    // 2. Resurser i Terraform som inte finns i AWS
    for (const sg of terraform.aws_security_group || []) {
      const inAWS = aws.security_groups?.some(a => 
        a.name?.includes(sg)
      );
      
      if (!inAWS) {
        this.findings.push({
          type: 'DRIFT',
          severity: 'MEDIUM',
          category: 'Missing Resource',
          description: `Security Group ${sg} finns i Terraform men inte i AWS`,
          terraform: sg,
          aws: null,
          action: 'Create or update Terraform'
        });
      }
    }
    
    // 3. Secrets utan rotation
    for (const secret of aws.secrets || []) {
      if (!secret.rotation) {
        this.findings.push({
          type: 'DRIFT',
          severity: 'CRITICAL',
          category: 'Security',
          description: `Secret ${secret.name} har ingen rotation`,
          terraform: null,
          aws: secret,
          action: 'Enable rotation (STOP-013)'
        });
      }
    }
    
    return this.findings;
  }

  /**
   * Generera rapport
   */
  report() {
    const findings = this.detect();
    
    return {
      summary: {
        total: findings.length,
        critical: findings.filter(f => f.severity === 'CRITICAL').length,
        high: findings.filter(f => f.severity === 'HIGH').length,
        medium: findings.filter(f => f.severity === 'MEDIUM').length,
        low: findings.filter(f => f.severity === 'LOW').length
      },
      findings,
      generatedAt: new Date().toISOString()
    };
  }
}

// CLI
if (process.argv[1] === new URL(import.meta.url).pathname) {
  const engine = new DriftDetectionEngine(
    '/home/bernt/.openclaw/workspace/terraform/aamos-ledger',
    '/home/bernt/.openclaw/workspace/terraform/discovery'
  );
  
  console.log(JSON.stringify(engine.report(), null, 2));
}

export { DriftDetectionEngine };