// compliance-automation-framework.ts
import { CloudFormationClient, DescribeStacksCommand } from '@aws-sdk/client-cloudformation';
import { ConfigServiceClient, GetComplianceDetailsByConfigRuleCommand, PutConfigRuleCommand } from '@aws-sdk/client-config-service';
import { S3Client, GetBucketPolicyCommand, GetBucketEncryptionCommand } from '@aws-sdk/client-s3';
import { IAMClient, ListPoliciesCommand, GetPolicyVersionCommand } from '@aws-sdk/client-iam';
import { EC2Client, DescribeSecurityGroupsCommand } from '@aws-sdk/client-ec2';

interface ComplianceFramework {
  name: string;
  version: string;
  controls: ComplianceControl[];
  applicability: ApplicabilityRule[];
  reportingRequirements: ReportingRequirement[];
}

interface ComplianceControl {
  controlId: string;
  title: string;
  description: string;
  category: ControlCategory;
  severity: ComplianceSeverity;
  automationLevel: AutomationLevel;
  testProcedures: TestProcedure[];
  remediationActions: RemediationAction[];
}

interface TestProcedure {
  procedureId: string;
  type: TestType;
  frequency: TestFrequency;
  implementation: TestImplementation;
  expectedResult: ExpectedResult;
}

interface ComplianceAssessment {
  frameworkName: string;
  assessmentId: string;
  timestamp: Date;
  scope: AssessmentScope;
  findings: ComplianceFinding[];
  overallStatus: ComplianceStatus;
  riskScore: number;
  nextAssessment: Date;
}

enum ControlCategory {
  ACCESS_CONTROL = 'ACCESS_CONTROL',
  DATA_PROTECTION = 'DATA_PROTECTION',
  NETWORK_SECURITY = 'NETWORK_SECURITY',
  AUDIT_LOGGING = 'AUDIT_LOGGING',
  INCIDENT_RESPONSE = 'INCIDENT_RESPONSE',
  BUSINESS_CONTINUITY = 'BUSINESS_CONTINUITY',
  RISK_MANAGEMENT = 'RISK_MANAGEMENT'
}

enum ComplianceSeverity {
  CRITICAL = 'CRITICAL',
  HIGH = 'HIGH',
  MEDIUM = 'MEDIUM',
  LOW = 'LOW'
}

enum AutomationLevel {
  FULLY_AUTOMATED = 'FULLY_AUTOMATED',
  PARTIALLY_AUTOMATED = 'PARTIALLY_AUTOMATED',
  MANUAL = 'MANUAL'
}

enum TestType {
  CONFIGURATION_CHECK = 'CONFIGURATION_CHECK',
  BEHAVIORAL_TEST = 'BEHAVIORAL_TEST',
  DOCUMENTATION_REVIEW = 'DOCUMENTATION_REVIEW',
  INTERVIEW = 'INTERVIEW'
}

enum TestFrequency {
  CONTINUOUS = 'CONTINUOUS',
  DAILY = 'DAILY',
  WEEKLY = 'WEEKLY',
  MONTHLY = 'MONTHLY',
  QUARTERLY = 'QUARTERLY',
  ANNUALLY = 'ANNUALLY'
}

enum ComplianceStatus {
  COMPLIANT = 'COMPLIANT',
  NON_COMPLIANT = 'NON_COMPLIANT',
  PARTIALLY_COMPLIANT = 'PARTIALLY_COMPLIANT',
  NOT_APPLICABLE = 'NOT_APPLICABLE',
  UNKNOWN = 'UNKNOWN'
}

export class ComplianceAutomationFramework {
  private readonly cloudFormationClient: CloudFormationClient;
  private readonly configServiceClient: ConfigServiceClient;
  private readonly s3Client: S3Client;
  private readonly iamClient: IAMClient;
  private readonly ec2Client: EC2Client;
  private readonly frameworks: Map<string, ComplianceFramework>;

  constructor() {
    this.cloudFormationClient = new CloudFormationClient({});
    this.configServiceClient = new ConfigServiceClient({});
    this.s3Client = new S3Client({});
    this.iamClient = new IAMClient({});
    this.ec2Client = new EC2Client({});
    this.frameworks = new Map();
    
    this.initializeFrameworks();
  }

  private initializeFrameworks(): void {
    // Initialize SOC 2 Type II framework
    this.frameworks.set('SOC2', this.createSOC2Framework());
    
    // Initialize GDPR framework
    this.frameworks.set('GDPR', this.createGDPRFramework());
    
    // Initialize HIPAA framework
    this.frameworks.set('HIPAA', this.createHIPAAFramework());
    
    // Initialize PCI DSS framework
    this.frameworks.set('PCI-DSS', this.createPCIDSSFramework());
  }

  async runComplianceAssessment(
    frameworkName: string,
    scope: AssessmentScope
  ): Promise<ComplianceAssessment> {
    const framework = this.frameworks.get(frameworkName);
    if (!framework) {
      throw new Error(`Unknown compliance framework: ${frameworkName}`);
    }

    const assessmentId = this.generateAssessmentId();
    const findings: ComplianceFinding[] = [];

    // Execute automated tests for each control
    for (const control of framework.controls) {
      if (this.isControlApplicable(control, scope)) {
        const controlFindings = await this.assessControl(control, scope);
        findings.push(...controlFindings);
      }
    }

    // Calculate overall compliance status and risk score
    const overallStatus = this.calculateOverallStatus(findings);
    const riskScore = this.calculateRiskScore(findings, framework);

    const assessment: ComplianceAssessment = {
      frameworkName,
      assessmentId,
      timestamp: new Date(),
      scope,
      findings,
      overallStatus,
      riskScore,
      nextAssessment: this.calculateNextAssessmentDate(framework, overallStatus)
    };

    // Store assessment results
    await this.storeAssessmentResults(assessment);

    // Trigger remediation for non-compliant findings
    await this.triggerRemediation(assessment);

    return assessment;
  }

  private async assessControl(
    control: ComplianceControl,
    scope: AssessmentScope
  ): Promise<ComplianceFinding[]> {
    const findings: ComplianceFinding[] = [];

    for (const testProcedure of control.testProcedures) {
      if (testProcedure.type === TestType.CONFIGURATION_CHECK) {
        const procedureFindings = await this.executeConfigurationCheck(testProcedure, control, scope);
        findings.push(...procedureFindings);
      } else if (testProcedure.type === TestType.BEHAVIORAL_TEST) {
        const procedureFindings = await this.executeBehavioralTest(testProcedure, control, scope);
        findings.push(...procedureFindings);
      }
    }

    return findings;
  }

  private async executeConfigurationCheck(
    testProcedure: TestProcedure,
    control: ComplianceControl,
    scope: AssessmentScope
  ): Promise<ComplianceFinding[]> {
    const findings: ComplianceFinding[] = [];

    switch (control.controlId) {
      case 'SOC2-CC6.1':
        // Logical and physical access controls
        findings.push(...await this.checkAccessControls(scope));
        break;
        
      case 'SOC2-CC6.7':
        // Data transmission and disposal
        findings.push(...await this.checkDataTransmission(scope));
        break;
        
      case 'GDPR-ART32':
        // Security of processing
        findings.push(...await this.checkSecurityOfProcessing(scope));
        break;
        
      case 'HIPAA-164.312':
        // Technical safeguards
        findings.push(...await this.checkTechnicalSafeguards(scope));
        break;
        
      case 'PCI-DSS-4':
        // Encrypt transmission of cardholder data
        findings.push(...await this.checkCardholderDataEncryption(scope));
        break;
        
      default:
        console.warn(`No implementation for control ${control.controlId}`);
    }

    return findings;
  }

  private async checkAccessControls(scope: AssessmentScope): Promise<ComplianceFinding[]> {
    const findings: ComplianceFinding[] = [];

    // Check IAM policies for overly permissive access
    const policies = await this.iamClient.send(new ListPoliciesCommand({ Scope: 'Local' }));
    
    for (const policy of policies.Policies || []) {
      if (policy.Arn && policy.DefaultVersionId) {
        const policyVersion = await this.iamClient.send(new GetPolicyVersionCommand({
          PolicyArn: policy.Arn,
          VersionId: policy.DefaultVersionId
        }));

        if (policyVersion.PolicyVersion?.Document) {
          const policyDoc = JSON.parse(decodeURIComponent(policyVersion.PolicyVersion.Document));
          
          if (this.hasOverlyPermissiveActions(policyDoc)) {
            findings.push({
              controlId: 'SOC2-CC6.1',
              findingId: this.generateFindingId(),
              status: ComplianceStatus.NON_COMPLIANT,
              severity: ComplianceSeverity.HIGH,
              title: 'Overly Permissive IAM Policy',
              description: `IAM policy ${policy.PolicyName} contains overly permissive actions`,
              evidence: {
                policyArn: policy.Arn,
                policyDocument: policyDoc
              },
              remediation: {
                description: 'Review and restrict IAM policy permissions to follow principle of least privilege',
                automatedAction: 'REVIEW_REQUIRED'
              }
            });
          }
        }
      }
    }

    // Check security groups for overly open access
    const securityGroups = await this.ec2Client.send(new DescribeSecurityGroupsCommand({}));
    
    for (const sg of securityGroups.SecurityGroups || []) {
      for (const rule of sg.IpPermissions || []) {
        if (this.isOverlyPermissiveRule(rule)) {
          findings.push({
            controlId: 'SOC2-CC6.1',
            findingId: this.generateFindingId(),
            status: ComplianceStatus.NON_COMPLIANT,
            severity: ComplianceSeverity.MEDIUM,
            title: 'Overly Permissive Security Group Rule',
            description: `Security group ${sg.GroupName} has overly permissive inbound rules`,
            evidence: {
              securityGroupId: sg.GroupId,
              rule: rule
            },
            remediation: {
              description: 'Restrict security group rules to specific IP ranges and ports',
              automatedAction: 'AUTO_REMEDIATE'
            }
          });
        }
      }
    }

    return findings;
  }

  private async checkDataTransmission(scope: AssessmentScope): Promise<ComplianceFinding[]> {
    const findings: ComplianceFinding[] = [];

    // Check S3 buckets for encryption in transit
    // This would typically involve checking CloudFront distributions, load balancers, etc.
    const buckets = scope.resources?.s3Buckets || [];
    
    for (const bucketName of buckets) {
      try {
        const bucketPolicy = await this.s3Client.send(new GetBucketPolicyCommand({
          Bucket: bucketName
        }));

        if (bucketPolicy.Policy) {
          const policy = JSON.parse(bucketPolicy.Policy);
          
          if (!this.enforcesTLSOnly(policy)) {
            findings.push({
              controlId: 'SOC2-CC6.7',
              findingId: this.generateFindingId(),
              status: ComplianceStatus.NON_COMPLIANT,
              severity: ComplianceSeverity.HIGH,
              title: 'S3 Bucket Does Not Enforce TLS',
              description: `S3 bucket ${bucketName} does not enforce TLS-only access`,
              evidence: {
                bucketName: bucketName,
                policy: policy
              },
              remediation: {
                description: 'Add bucket policy to deny non-TLS requests',
                automatedAction: 'AUTO_REMEDIATE'
              }
            });
          }
        }
      } catch (error) {
        // No bucket policy - this itself might be a finding
        findings.push({
          controlId: 'SOC2-CC6.7',
          findingId: this.generateFindingId(),
          status: ComplianceStatus.NON_COMPLIANT,
          severity: ComplianceSeverity.MEDIUM,
          title: 'Missing S3 Bucket Policy',
          description: `S3 bucket ${bucketName} has no bucket policy to enforce security requirements`,
          evidence: {
            bucketName: bucketName,
            error: error.message
          },
          remediation: {
            description: 'Create bucket policy to enforce TLS and access controls',
            automatedAction: 'AUTO_REMEDIATE'
          }
        });
      }
    }

    return findings;
  }

  private async checkSecurityOfProcessing(scope: AssessmentScope): Promise<ComplianceFinding[]> {
    const findings: ComplianceFinding[] = [];

    // GDPR Article 32 - Security of processing
    // Check for encryption at rest
    const buckets = scope.resources?.s3Buckets || [];
    
    for (const bucketName of buckets) {
      try {
        const encryption = await this.s3Client.send(new GetBucketEncryptionCommand({
          Bucket: bucketName
        }));

        if (!encryption.ServerSideEncryptionConfiguration?.Rules?.length) {
          findings.push({
            controlId: 'GDPR-ART32',
            findingId: this.generateFindingId(),
            status: ComplianceStatus.NON_COMPLIANT,
            severity: ComplianceSeverity.HIGH,
            title: 'S3 Bucket Not Encrypted',
            description: `S3 bucket ${bucketName} does not have encryption at rest enabled`,
            evidence: {
              bucketName: bucketName
            },
            remediation: {
              description: 'Enable default encryption for S3 bucket',
              automatedAction: 'AUTO_REMEDIATE'
            }
          });
        }
      } catch (error) {
        findings.push({
          controlId: 'GDPR-ART32',
          findingId: this.generateFindingId(),
          status: ComplianceStatus.NON_COMPLIANT,
          severity: ComplianceSeverity.HIGH,
          title: 'S3 Bucket Encryption Status Unknown',
          description: `Unable to determine encryption status for S3 bucket ${bucketName}`,
          evidence: {
            bucketName: bucketName,
            error: error.message
          },
          remediation: {
            description: 'Verify and enable encryption for S3 bucket',
            automatedAction: 'REVIEW_REQUIRED'
          }
        });
      }
    }

    return findings;
  }

  private createSOC2Framework(): ComplianceFramework {
    return {
      name: 'SOC 2 Type II',
      version: '2017',
      controls: [
        {
          controlId: 'SOC2-CC6.1',
          title: 'Logical and Physical Access Controls',
          description: 'The entity implements logical and physical access controls to restrict access to system resources',
          category: ControlCategory.ACCESS_CONTROL,
          severity: ComplianceSeverity.HIGH,
          automationLevel: AutomationLevel.FULLY_AUTOMATED,
          testProcedures: [
            {
              procedureId: 'SOC2-CC6.1-001',
              type: TestType.CONFIGURATION_CHECK,
              frequency: TestFrequency.CONTINUOUS,
              implementation: TestImplementation.AUTOMATED_SCAN,
              expectedResult: {
                description: 'All access controls follow principle of least privilege',
                criteria: 'No overly permissive IAM policies or security groups'
              }
            }
          ],
          remediationActions: [
            {
              actionId: 'SOC2-CC6.1-REM-001',
              description: 'Automatically restrict overly permissive access',
              automationLevel: AutomationLevel.FULLY_AUTOMATED,
              estimatedEffort: 'LOW'
            }
          ]
        },
        {
          controlId: 'SOC2-CC6.7',
          title: 'Data Transmission and Disposal',
          description: 'The entity restricts the transmission and disposal of confidential information',
          category: ControlCategory.DATA_PROTECTION,
          severity: ComplianceSeverity.HIGH,
          automationLevel: AutomationLevel.FULLY_AUTOMATED,
          testProcedures: [
            {
              procedureId: 'SOC2-CC6.7-001',
              type: TestType.CONFIGURATION_CHECK,
              frequency: TestFrequency.CONTINUOUS,
              implementation: TestImplementation.AUTOMATED_SCAN,
              expectedResult: {
                description: 'All data transmission uses encryption in transit',
                criteria: 'TLS enforced for all data transmission endpoints'
              }
            }
          ],
          remediationActions: [
            {
              actionId: 'SOC2-CC6.7-REM-001',
              description: 'Automatically enforce TLS for data transmission',
              automationLevel: AutomationLevel.FULLY_AUTOMATED,
              estimatedEffort: 'MEDIUM'
            }
          ]
        }
      ],
      applicability: [
        {
          condition: 'organization processes customer data',
          required: true
        }
      ],
      reportingRequirements: [
        {
          reportType: 'SOC 2 Type II Report',
          frequency: TestFrequency.ANNUALLY,
          recipients: ['customers', 'auditors', 'management']
        }
      ]
    };
  }

  private createGDPRFramework(): ComplianceFramework {
    return {
      name: 'General Data Protection Regulation',
      version: '2018',
      controls: [
        {
          controlId: 'GDPR-ART32',
          title: 'Security of Processing',
          description: 'Implement appropriate technical and organizational measures to ensure security of processing',
          category: ControlCategory.DATA_PROTECTION,
          severity: ComplianceSeverity.CRITICAL,
          automationLevel: AutomationLevel.PARTIALLY_AUTOMATED,
          testProcedures: [
            {
              procedureId: 'GDPR-ART32-001',
              type: TestType.CONFIGURATION_CHECK,
              frequency: TestFrequency.CONTINUOUS,
              implementation: TestImplementation.AUTOMATED_SCAN,
              expectedResult: {
                description: 'Personal data is encrypted at rest and in transit',
                criteria: 'All storage and transmission of personal data uses appropriate encryption'
              }
            }
          ],
          remediationActions: [
            {
              actionId: 'GDPR-ART32-REM-001',
              description: 'Enable encryption for all personal data storage and transmission',
              automationLevel: AutomationLevel.PARTIALLY_AUTOMATED,
              estimatedEffort: 'HIGH'
            }
          ]
        }
      ],
      applicability: [
        {
          condition: 'processes personal data of EU residents',
          required: true
        }
      ],
      reportingRequirements: [
        {
          reportType: 'Data Protection Impact Assessment',
          frequency: TestFrequency.ANNUALLY,
          recipients: ['data_protection_officer', 'management']
        }
      ]
    };
  }

  // Helper methods
  private hasOverlyPermissiveActions(policyDoc: any): boolean {
    if (!policyDoc.Statement) return false;
    
    const statements = Array.isArray(policyDoc.Statement) ? policyDoc.Statement : [policyDoc.Statement];
    
    return statements.some(statement => {
      if (statement.Effect === 'Allow') {
        const actions = Array.isArray(statement.Action) ? statement.Action : [statement.Action];
        return actions.some(action => action === '*' || action.endsWith(':*'));
      }
      return false;
    });
  }

  private isOverlyPermissiveRule(rule: any): boolean {
    // Check if rule allows access from anywhere (0.0.0.0/0) on sensitive ports
    const sensitivePorts = [22, 3389, 1433, 3306, 5432, 6379, 27017];
    
    if (rule.IpRanges?.some((range: any) => range.CidrIp === '0.0.0.0/0')) {
      return rule.FromPort && sensitivePorts.includes(rule.FromPort);
    }
    
    return false;
  }

  private enforcesTLSOnly(policy: any): boolean {
    if (!policy.Statement) return false;
    
    const statements = Array.isArray(policy.Statement) ? policy.Statement : [policy.Statement];
    
    return statements.some(statement => {
      return statement.Effect === 'Deny' &&
             statement.Condition?.Bool?.['aws:SecureTransport'] === 'false';
    });
  }

  private calculateOverallStatus(findings: ComplianceFinding[]): ComplianceStatus {
    const criticalFindings = findings.filter(f => f.severity === ComplianceSeverity.CRITICAL);
    const nonCompliantFindings = findings.filter(f => f.status === ComplianceStatus.NON_COMPLIANT);
    
    if (criticalFindings.length > 0 || nonCompliantFindings.length > findings.length * 0.2) {
      return ComplianceStatus.NON_COMPLIANT;
    } else if (nonCompliantFindings.length > 0) {
      return ComplianceStatus.PARTIALLY_COMPLIANT;
    } else {
      return ComplianceStatus.COMPLIANT;
    }
  }

  private calculateRiskScore(findings: ComplianceFinding[], framework: ComplianceFramework): number {
    const severityWeights = {
      [ComplianceSeverity.CRITICAL]: 25,
      [ComplianceSeverity.HIGH]: 15,
      [ComplianceSeverity.MEDIUM]: 8,
      [ComplianceSeverity.LOW]: 3
    };
    
    const totalRisk = findings.reduce((total, finding) => {
      return total + (severityWeights[finding.severity] || 0);
    }, 0);
    
    return Math.min(100, totalRisk);
  }

  private generateAssessmentId(): string {
    return `COMP-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
  }

  private generateFindingId(): string {
    return `FIND-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
  }

  // Additional helper methods and type definitions would continue...
}

// Supporting types and interfaces
interface ApplicabilityRule {
  condition: string;
  required: boolean;
}

interface ReportingRequirement {
  reportType: string;
  frequency: TestFrequency;
  recipients: string[];
}

interface TestImplementation {
  AUTOMATED_SCAN: 'AUTOMATED_SCAN';
  MANUAL_REVIEW: 'MANUAL_REVIEW';
  HYBRID: 'HYBRID';
}

interface ExpectedResult {
  description: string;
  criteria: string;
}

interface RemediationAction {
  actionId: string;
  description: string;
  automationLevel: AutomationLevel;
  estimatedEffort: 'LOW' | 'MEDIUM' | 'HIGH';
}

interface AssessmentScope {
  environment: string;
  regions: string[];
  resources?: {
    s3Buckets?: string[];
    lambdaFunctions?: string[];
    databases?: string[];
    networks?: string[];
  };
  dataClassifications: string[];
}

interface ComplianceFinding {
  controlId: string;
  findingId: string;
  status: ComplianceStatus;
  severity: ComplianceSeverity;
  title: string;
  description: string;
  evidence: Record<string, any>;
  remediation: {
    description: string;
    automatedAction: 'AUTO_REMEDIATE' | 'REVIEW_REQUIRED' | 'MANUAL_ACTION';
  };
}

const TestImplementation = {
  AUTOMATED_SCAN: 'AUTOMATED_SCAN' as const,
  MANUAL_REVIEW: 'MANUAL_REVIEW' as const,
  HYBRID: 'HYBRID' as const
};

// evidence-collection-service.ts
import { S3Client, PutObjectCommand } from '@aws-sdk/client-s3';
import { CloudTrailClient, LookupEventsCommand } from '@aws-sdk/client-cloudtrail';
import { EC2Client, DescribeInstancesCommand } from '@aws-sdk/client-ec2';
import { RDSClient, DescribeDBInstancesCommand } from '@aws-sdk/client-rds';
import { CloudWatchLogsClient, DescribeLogGroupsCommand, FilterLogEventsCommand } from '@aws-sdk/client-cloudwatch-logs';
import crypto from 'crypto';

interface EvidencePackage {
  packageId: string;
  complianceFramework: string;
  controlId: string;
  collectionTimestamp: Date;
  validityPeriod: {
    startDate: Date;
    endDate: Date;
  };
  evidenceItems: EvidenceItem[];
  integrity: EvidenceIntegrity;
  metadata: EvidenceMetadata;
}

interface EvidenceItem {
  itemId: string;
  itemType: EvidenceType;
  title: string;
  description: string;
  source: EvidenceSource;
  collectionMethod: CollectionMethod;
  content: EvidenceContent;
  digitalSignature: string;
  timestamp: Date;
}

interface EvidenceContent {
  data: any;
  format: ContentFormat;
  encoding: string;
  checksum: string;
  size: number;
}

interface EvidenceIntegrity {
  packageHash: string;
  digitalSignature: string;
  witnessedBy: string;
  tamperEvident: boolean;
  verificationResults: VerificationResult[];
}

enum EvidenceType {
  CONFIGURATION_SNAPSHOT = 'CONFIGURATION_SNAPSHOT',
  LOG_EXTRACT = 'LOG_EXTRACT',
  AUDIT_TRAIL = 'AUDIT_TRAIL',
  POLICY_DOCUMENT = 'POLICY_DOCUMENT',
  SCREENSHOT = 'SCREENSHOT',
  TEST_RESULT = 'TEST_RESULT',
  PROCEDURAL_DOCUMENTATION = 'PROCEDURAL_DOCUMENTATION',
  MANAGEMENT_ATTESTATION = 'MANAGEMENT_ATTESTATION'
}

enum CollectionMethod {
  AUTOMATED_API = 'AUTOMATED_API',
  AUTOMATED_SCAN = 'AUTOMATED_SCAN',
  MANUAL_COLLECTION = 'MANUAL_COLLECTION',
  CONTINUOUS_MONITORING = 'CONTINUOUS_MONITORING'
}

enum ContentFormat {
  JSON = 'JSON',
  XML = 'XML',
  PDF = 'PDF',
  CSV = 'CSV',
  PNG = 'PNG',
  TXT = 'TXT'
}

export class EvidenceCollectionService {
  private readonly s3Client: S3Client;
  private readonly cloudTrailClient: CloudTrailClient;
  private readonly ec2Client: EC2Client;
  private readonly rdsClient: RDSClient;
  private readonly cloudWatchClient: CloudWatchLogsClient;
  private readonly evidenceBucket: string;

  constructor(evidenceBucket: string) {
    this.s3Client = new S3Client({});
    this.cloudTrailClient = new CloudTrailClient({});
    this.ec2Client = new EC2Client({});
    this.rdsClient = new RDSClient({});
    this.cloudWatchClient = new CloudWatchLogsClient({});
    this.evidenceBucket = evidenceBucket;
  }

  async collectEvidenceForControl(
    complianceFramework: string,
    controlId: string,
    scope: EvidenceScope
  ): Promise<EvidencePackage> {
    const packageId = this.generatePackageId();
    const evidenceItems: EvidenceItem[] = [];

    try {
      // Collect configuration evidence
      const configurationEvidence = await this.collectConfigurationEvidence(controlId, scope);
      evidenceItems.push(...configurationEvidence);

      // Collect audit trail evidence
      const auditTrailEvidence = await this.collectAuditTrailEvidence(controlId, scope);
      evidenceItems.push(...auditTrailEvidence);

      // Collect operational evidence
      const operationalEvidence = await this.collectOperationalEvidence(controlId, scope);
      evidenceItems.push(...operationalEvidence);

      // Collect policy evidence
      const policyEvidence = await this.collectPolicyEvidence(controlId, scope);
      evidenceItems.push(...policyEvidence);

      // Create evidence package
      const evidencePackage: EvidencePackage = {
        packageId,
        complianceFramework,
        controlId,
        collectionTimestamp: new Date(),
        validityPeriod: {
          startDate: scope.startDate,
          endDate: scope.endDate
        },
        evidenceItems,
        integrity: await this.generateIntegrityData(evidenceItems),
        metadata: this.generateMetadata(controlId, scope)
      };

      // Store evidence package
      await this.storeEvidencePackage(evidencePackage);

      // Verify evidence integrity
      await this.verifyEvidenceIntegrity(evidencePackage);

      return evidencePackage;
    } catch (error) {
      console.error(`Failed to collect evidence for control ${controlId}:`, error);
      throw error;
    }
  }

  private async collectConfigurationEvidence(
    controlId: string,
    scope: EvidenceScope
  ): Promise<EvidenceItem[]> {
    const evidenceItems: EvidenceItem[] = [];

    switch (controlId) {
      case 'SOC2-CC6.1':
        // Collect IAM configuration evidence
        evidenceItems.push(...await this.collectIAMEvidence(scope));
        evidenceItems.push(...await this.collectNetworkEvidence(scope));
        break;

      case 'SOC2-CC6.7':
        // Collect encryption configuration evidence
        evidenceItems.push(...await this.collectEncryptionEvidence(scope));
        break;

      case 'GDPR-ART32':
        // Collect data protection evidence
        evidenceItems.push(...await this.collectDataProtectionEvidence(scope));
        break;

      case 'HIPAA-164.312':
        // Collect technical safeguards evidence
        evidenceItems.push(...await this.collectTechnicalSafeguardsEvidence(scope));
        break;
    }

    return evidenceItems;
  }

  private async collectIAMEvidence(scope: EvidenceScope): Promise<EvidenceItem[]> {
    const evidenceItems: EvidenceItem[] = [];

    // Collect IAM user configurations
    const iamUsers = await this.getIAMUsers();
    evidenceItems.push({
      itemId: this.generateItemId(),
      itemType: EvidenceType.CONFIGURATION_SNAPSHOT,
      title: 'IAM Users Configuration',
      description: 'Snapshot of all IAM users and their configurations',
      source: {
        system: 'AWS IAM',
        account: scope.awsAccountId,
        region: 'global'
      },
      collectionMethod: CollectionMethod.AUTOMATED_API,
      content: {
        data: iamUsers,
        format: ContentFormat.JSON,
        encoding: 'utf-8',
        checksum: this.calculateChecksum(JSON.stringify(iamUsers)),
        size: JSON.stringify(iamUsers).length
      },
      digitalSignature: await this.signContent(JSON.stringify(iamUsers)),
      timestamp: new Date()
    });

    // Collect IAM policies
    const iamPolicies = await this.getIAMPolicies();
    evidenceItems.push({
      itemId: this.generateItemId(),
      itemType: EvidenceType.CONFIGURATION_SNAPSHOT,
      title: 'IAM Policies Configuration',
      description: 'Snapshot of all custom IAM policies',
      source: {
        system: 'AWS IAM',
        account: scope.awsAccountId,
        region: 'global'
      },
      collectionMethod: CollectionMethod.AUTOMATED_API,
      content: {
        data: iamPolicies,
        format: ContentFormat.JSON,
        encoding: 'utf-8',
        checksum: this.calculateChecksum(JSON.stringify(iamPolicies)),
        size: JSON.stringify(iamPolicies).length
      },
      digitalSignature: await this.signContent(JSON.stringify(iamPolicies)),
      timestamp: new Date()
    });

    return evidenceItems;
  }

  private async collectAuditTrailEvidence(
    controlId: string,
    scope: EvidenceScope
  ): Promise<EvidenceItem[]> {
    const evidenceItems: EvidenceItem[] = [];

    // Collect CloudTrail events relevant to the control
    const cloudTrailEvents = await this.getCloudTrailEvents(controlId, scope);
    
    evidenceItems.push({
      itemId: this.generateItemId(),
      itemType: EvidenceType.AUDIT_TRAIL,
      title: 'CloudTrail Audit Events',
      description: `CloudTrail events relevant to control ${controlId} for the specified time period`,
      source: {
        system: 'AWS CloudTrail',
        account: scope.awsAccountId,
        region: scope.region
      },
      collectionMethod: CollectionMethod.AUTOMATED_API,
      content: {
        data: cloudTrailEvents,
        format: ContentFormat.JSON,
        encoding: 'utf-8',
        checksum: this.calculateChecksum(JSON.stringify(cloudTrailEvents)),
        size: JSON.stringify(cloudTrailEvents).length
      },
      digitalSignature: await this.signContent(JSON.stringify(cloudTrailEvents)),
      timestamp: new Date()
    });

    return evidenceItems;
  }

  private async collectOperationalEvidence(
    controlId: string,
    scope: EvidenceScope
  ): Promise<EvidenceItem[]> {
    const evidenceItems: EvidenceItem[] = [];

    // Collect relevant log data
    const logEvents = await this.getRelevantLogEvents(controlId, scope);
    
    if (logEvents.length > 0) {
      evidenceItems.push({
        itemId: this.generateItemId(),
        itemType: EvidenceType.LOG_EXTRACT,
        title: 'Operational Log Events',
        description: `Log events demonstrating control operation for ${controlId}`,
        source: {
          system: 'AWS CloudWatch Logs',
          account: scope.awsAccountId,
          region: scope.region
        },
        collectionMethod: CollectionMethod.AUTOMATED_SCAN,
        content: {
          data: logEvents,
          format: ContentFormat.JSON,
          encoding: 'utf-8',
          checksum: this.calculateChecksum(JSON.stringify(logEvents)),
          size: JSON.stringify(logEvents).length
        },
        digitalSignature: await this.signContent(JSON.stringify(logEvents)),
        timestamp: new Date()
      });
    }

    return evidenceItems;
  }

  private async collectPolicyEvidence(
    controlId: string,
    scope: EvidenceScope
  ): Promise<EvidenceItem[]> {
    const evidenceItems: EvidenceItem[] = [];

    // Collect organizational policies relevant to the control
    const organizationalPolicies = await this.getOrganizationalPolicies(controlId);
    
    for (const policy of organizationalPolicies) {
      evidenceItems.push({
        itemId: this.generateItemId(),
        itemType: EvidenceType.POLICY_DOCUMENT,
        title: policy.title,
        description: `Organizational policy supporting control ${controlId}`,
        source: {
          system: 'Policy Management System',
          account: scope.awsAccountId,
          region: 'global'
        },
        collectionMethod: CollectionMethod.MANUAL_COLLECTION,
        content: {
          data: policy,
          format: ContentFormat.PDF,
          encoding: 'base64',
          checksum: this.calculateChecksum(policy.content),
          size: policy.content.length
        },
        digitalSignature: await this.signContent(policy.content),
        timestamp: new Date()
      });
    }

    return evidenceItems;
  }

  private async storeEvidencePackage(evidencePackage: EvidencePackage): Promise<void> {
    const key = `evidence-packages/${evidencePackage.complianceFramework}/${evidencePackage.controlId}/${evidencePackage.packageId}.json`;
    
    const command = new PutObjectCommand({
      Bucket: this.evidenceBucket,
      Key: key,
      Body: JSON.stringify(evidencePackage, null, 2),
      ContentType: 'application/json',
      Metadata: {
        'compliance-framework': evidencePackage.complianceFramework,
        'control-id': evidencePackage.controlId,
        'package-id': evidencePackage.packageId,
        'collection-timestamp': evidencePackage.collectionTimestamp.toISOString()
      },
      ServerSideEncryption: 'aws:kms'
    });

    await this.s3Client.send(command);

    // Store individual evidence items
    for (const item of evidencePackage.evidenceItems) {
      await this.storeEvidenceItem(evidencePackage, item);
    }
  }

  private async storeEvidenceItem(
    evidencePackage: EvidencePackage,
    item: EvidenceItem
  ): Promise<void> {
    const key = `evidence-items/${evidencePackage.packageId}/${item.itemId}`;
    
    const command = new PutObjectCommand({
      Bucket: this.evidenceBucket,
      Key: key,
      Body: JSON.stringify(item.content.data),
      ContentType: this.getContentType(item.content.format),
      Metadata: {
        'item-id': item.itemId,
        'item-type': item.itemType,
        'package-id': evidencePackage.packageId,
        'digital-signature': item.digitalSignature,
        'checksum': item.content.checksum
      },
      ServerSideEncryption: 'aws:kms'
    });

    await this.s3Client.send(command);
  }

  private async generateIntegrityData(evidenceItems: EvidenceItem[]): Promise<EvidenceIntegrity> {
    const packageContent = evidenceItems.map(item => item.content.checksum).join('|');
    const packageHash = this.calculateChecksum(packageContent);
    const digitalSignature = await this.signContent(packageContent);

    return {
      packageHash,
      digitalSignature,
      witnessedBy: 'evidence-collection-service',
      tamperEvident: true,
      verificationResults: []
    };
  }

  private generateMetadata(controlId: string, scope: EvidenceScope): EvidenceMetadata {
    return {
      collector: 'automated-evidence-service',
      collectionVersion: '1.0.0',
      controlId,
      scope,
      retentionPeriod: '7years',
      accessControls: {
        viewPermissions: ['auditor', 'compliance-officer'],
        modifyPermissions: ['system-admin'],
        deletePermissions: []
      }
    };
  }

  // Helper methods
  private async getCloudTrailEvents(controlId: string, scope: EvidenceScope): Promise<any[]> {
    const eventNames = this.getRelevantEventNames(controlId);
    const events: any[] = [];

    for (const eventName of eventNames) {
      const command = new LookupEventsCommand({
        LookupAttributes: [
          {
            AttributeKey: 'EventName',
            AttributeValue: eventName
          }
        ],
        StartTime: scope.startDate,
        EndTime: scope.endDate
      });

      const response = await this.cloudTrailClient.send(command);
      if (response.Events) {
        events.push(...response.Events);
      }
    }

    return events;
  }

  private getRelevantEventNames(controlId: string): string[] {
    const eventMappings = {
      'SOC2-CC6.1': ['CreateUser', 'DeleteUser', 'AttachUserPolicy', 'DetachUserPolicy'],
      'SOC2-CC6.7': ['PutBucketEncryption', 'PutBucketPolicy', 'CreateBucket'],
      'GDPR-ART32': ['PutBucketEncryption', 'PutBucketPolicy', 'CreateDBInstance'],
      'HIPAA-164.312': ['PutBucketEncryption', 'ModifyDBInstance', 'CreateSecurityGroup']
    };

    return eventMappings[controlId] || [];
  }

  private calculateChecksum(content: string): string {
    return crypto.createHash('sha256').update(content).digest('hex');
  }

  private async signContent(content: string): Promise<string> {
    // In a real implementation, this would use a proper digital signature
    // with a private key managed by AWS KMS or HSM
    return crypto.createHmac('sha256', 'evidence-signing-key').update(content).digest('hex');
  }

  private generatePackageId(): string {
    return `EVP-${Date.now()}-${crypto.randomUUID()}`;
  }

  private generateItemId(): string {
    return `EVI-${Date.now()}-${crypto.randomUUID()}`;
  }

  private getContentType(format: ContentFormat): string {
    const contentTypes = {
      [ContentFormat.JSON]: 'application/json',
      [ContentFormat.XML]: 'application/xml',
      [ContentFormat.PDF]: 'application/pdf',
      [ContentFormat.CSV]: 'text/csv',
      [ContentFormat.PNG]: 'image/png',
      [ContentFormat.TXT]: 'text/plain'
    };
    
    return contentTypes[format] || 'application/octet-stream';
  }

  // Placeholder methods for data collection - would be implemented based on specific requirements
  private async getIAMUsers(): Promise<any[]> { return []; }
  private async getIAMPolicies(): Promise<any[]> { return []; }
  private async getRelevantLogEvents(controlId: string, scope: EvidenceScope): Promise<any[]> { return []; }
  private async getOrganizationalPolicies(controlId: string): Promise<any[]> { return []; }
  private async verifyEvidenceIntegrity(evidencePackage: EvidencePackage): Promise<void> {}
}

// Supporting interfaces
interface EvidenceScope {
  awsAccountId: string;
  region: string;
  startDate: Date;
  endDate: Date;
  resourceTypes: string[];
  dataClassifications: string[];
}

interface EvidenceSource {
  system: string;
  account: string;
  region: string;
}

interface EvidenceMetadata {
  collector: string;
  collectionVersion: string;
  controlId: string;
  scope: EvidenceScope;
  retentionPeriod: string;
  accessControls: {
    viewPermissions: string[];
    modifyPermissions: string[];
    deletePermissions: string[];
  };
}

interface VerificationResult {
  verificationId: string;
  verificationTime: Date;
  verifier: string;
  result: 'PASSED' | 'FAILED';
  details: string;
}