"""
Access Control Auditor Agent

Audits access controls, permissions, roles, and privileges across systems
to ensure principle of least privilege and proper access management.
"""

from typing import Any, Dict, List
from agents.base import BaseAgent


class AccessControlAuditorAgent(BaseAgent):
    """
    Access control audit agent.

    Audits:
    - User permissions and roles
    - Privilege escalation paths
    - Excessive privileges
    - Orphaned accounts
    - Service account security
    - Role-Based Access Control (RBAC)
    """

    def __init__(self):
        super().__init__(
            name='access-control-auditor',
            description='Audit access controls',
            category='security',
            version='1.0.0',
            tags=['access-control', 'permissions', 'rbac', 'iam', 'audit', 'privileges']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Audit access controls.

        Args:
            params: {
                'scope': {
                    'systems': List[str],
                    'cloud_accounts': List[str],
                    'applications': List[str],
                    'databases': List[str]
                },
                'audit_type': 'comprehensive|user-focused|role-focused|permission-focused',
                'options': {
                    'check_excessive_privileges': bool,
                    'check_orphaned_accounts': bool,
                    'check_service_accounts': bool,
                    'check_password_age': bool,
                    'check_mfa': bool,
                    'check_last_login': bool,
                    'simulate_privilege_escalation': bool
                },
                'thresholds': {
                    'inactive_days': int,
                    'password_age_days': int,
                    'last_login_days': int
                },
                'exclude_accounts': List[str],
                'compliance_frameworks': ['cis', 'nist', 'pci-dss']
            }

        Returns:
            {
                'status': 'success|failed',
                'audit_id': str,
                'findings': List[Dict],
                'users_audited': int,
                'roles_audited': int,
                'violations': List[Dict]
            }
        """
        scope = params.get('scope', {})
        audit_type = params.get('audit_type', 'comprehensive')
        options = params.get('options', {})
        thresholds = params.get('thresholds', {})

        self.logger.info(
            f"Auditing access controls - {audit_type} audit"
        )

        # Mock access control audit findings
        findings = [
            {
                'id': 'ACCESS-001',
                'severity': 'critical',
                'category': 'Excessive Privileges',
                'title': 'Users with Administrative Access',
                'description': '23 users have full administrative privileges',
                'users_affected': [
                    {'username': 'john.doe', 'role': 'Administrator', 'justification': 'Not documented'},
                    {'username': 'jane.smith', 'role': 'Domain Admin', 'justification': 'Not documented'},
                    {'username': 'bob.wilson', 'role': 'Root', 'justification': 'Not documented'}
                ],
                'total_users': 23,
                'impact': 'Increased risk of privilege abuse and unauthorized access',
                'recommendation': 'Review and remove unnecessary administrative privileges',
                'compliance_violations': ['CIS 5.1', 'NIST AC-6'],
                'risk_score': 9.0
            },
            {
                'id': 'ACCESS-002',
                'severity': 'high',
                'category': 'Orphaned Accounts',
                'title': 'Inactive User Accounts',
                'description': '47 user accounts inactive for over 90 days',
                'inactive_accounts': [
                    {'username': 'old.user1', 'last_login': '2024-05-15', 'days_inactive': 185},
                    {'username': 'old.user2', 'last_login': '2024-06-20', 'days_inactive': 149},
                    {'username': 'contractor1', 'last_login': '2024-07-10', 'days_inactive': 129}
                ],
                'total_inactive': 47,
                'recommendation': 'Disable or remove inactive user accounts',
                'compliance_violations': ['CIS 5.2', 'PCI-DSS 8.1.4'],
                'risk_score': 7.5
            },
            {
                'id': 'ACCESS-003',
                'severity': 'critical',
                'category': 'Shared Accounts',
                'title': 'Shared Administrative Accounts',
                'description': '8 shared accounts with administrative privileges',
                'shared_accounts': [
                    {'username': 'admin', 'users_sharing': 15, 'last_used': '2025-11-16'},
                    {'username': 'root', 'users_sharing': 8, 'last_used': '2025-11-16'},
                    {'username': 'sa', 'users_sharing': 12, 'last_used': '2025-11-15'}
                ],
                'total_shared_accounts': 8,
                'impact': 'Inability to track individual user actions, accountability gap',
                'recommendation': 'Create individual accounts for all users, disable shared accounts',
                'compliance_violations': ['HIPAA 164.312(a)(1)', 'PCI-DSS 8.1', 'SOC2 CC6.1'],
                'risk_score': 9.5
            },
            {
                'id': 'ACCESS-004',
                'severity': 'high',
                'category': 'Password Security',
                'title': 'Passwords Not Changed',
                'description': '67 users have not changed passwords in over 180 days',
                'users_with_old_passwords': 67,
                'oldest_password': '987 days',
                'average_password_age': '245 days',
                'recommendation': 'Enforce password rotation policy',
                'compliance_violations': ['CIS 1.2', 'PCI-DSS 8.2.4'],
                'risk_score': 7.0
            },
            {
                'id': 'ACCESS-005',
                'severity': 'critical',
                'category': 'MFA',
                'title': 'Multi-Factor Authentication Not Enabled',
                'description': 'MFA not enabled for 89 privileged users',
                'users_without_mfa': 89,
                'privileged_users_without_mfa': 23,
                'admin_users_without_mfa': 12,
                'impact': 'Increased risk of account compromise',
                'recommendation': 'Enforce MFA for all users, especially privileged accounts',
                'compliance_violations': ['CIS 6.4', 'NIST IA-2(1)', 'PCI-DSS 8.3'],
                'risk_score': 9.0
            },
            {
                'id': 'ACCESS-006',
                'severity': 'high',
                'category': 'Service Accounts',
                'title': 'Insecure Service Accounts',
                'description': '15 service accounts with excessive privileges',
                'service_accounts': [
                    {
                        'name': 'app_service',
                        'privileges': 'DB Owner',
                        'required_privileges': 'Read/Write',
                        'excess': True
                    },
                    {
                        'name': 'backup_service',
                        'privileges': 'Domain Admin',
                        'required_privileges': 'Backup Operator',
                        'excess': True
                    }
                ],
                'total_service_accounts': 15,
                'password_never_expires': 12,
                'weak_passwords': 5,
                'recommendation': 'Apply least privilege, use managed service accounts',
                'risk_score': 8.0
            },
            {
                'id': 'ACCESS-007',
                'severity': 'medium',
                'category': 'Role Assignment',
                'title': 'Overly Broad Role Assignments',
                'description': 'Users assigned to multiple conflicting roles',
                'conflicting_assignments': [
                    {
                        'user': 'finance.user',
                        'roles': ['Finance-ReadOnly', 'Finance-Admin'],
                        'conflict': 'Segregation of duties violation'
                    },
                    {
                        'user': 'audit.user',
                        'roles': ['Auditor', 'System-Admin'],
                        'conflict': 'Auditor should not have admin rights'
                    }
                ],
                'total_conflicts': 34,
                'recommendation': 'Review role assignments for segregation of duties',
                'compliance_violations': ['SOC2 CC6.1'],
                'risk_score': 6.5
            },
            {
                'id': 'ACCESS-008',
                'severity': 'high',
                'category': 'Privilege Escalation',
                'title': 'Privilege Escalation Paths Detected',
                'description': 'Multiple paths for privilege escalation identified',
                'escalation_paths': [
                    {
                        'from_user': 'regular.user',
                        'to_privilege': 'Administrator',
                        'method': 'Misconfigured sudo rules',
                        'steps': 3
                    },
                    {
                        'from_user': 'web_app',
                        'to_privilege': 'System',
                        'method': 'Vulnerable service running as SYSTEM',
                        'steps': 2
                    }
                ],
                'total_paths': 12,
                'recommendation': 'Fix privilege escalation vulnerabilities',
                'risk_score': 8.5
            }
        ]

        severity_counts = {
            'critical': sum(1 for f in findings if f['severity'] == 'critical'),
            'high': sum(1 for f in findings if f['severity'] == 'high'),
            'medium': sum(1 for f in findings if f['severity'] == 'medium'),
            'low': sum(1 for f in findings if f['severity'] == 'low')
        }

        user_statistics = {
            'total_users': 456,
            'active_users': 409,
            'inactive_users': 47,
            'privileged_users': 89,
            'admin_users': 23,
            'service_accounts': 78,
            'shared_accounts': 8,
            'users_with_mfa': 367,
            'users_without_mfa': 89,
            'orphaned_accounts': 47,
            'locked_accounts': 12,
            'disabled_accounts': 34
        }

        role_statistics = {
            'total_roles': 145,
            'custom_roles': 89,
            'built_in_roles': 56,
            'overly_permissive_roles': 23,
            'unused_roles': 12,
            'roles_with_admin_privileges': 15
        }

        permission_analysis = {
            'total_permissions_analyzed': 12456,
            'excessive_permissions': 2345,
            'unused_permissions': 890,
            'high_risk_permissions': 156,
            'least_privilege_violations': 234
        }

        recommendations = [
            'IMMEDIATE: Disable 8 shared administrative accounts',
            'IMMEDIATE: Enforce MFA for all 89 privileged users',
            'HIGH: Remove administrative privileges from 23 users',
            'HIGH: Disable 47 inactive user accounts',
            'HIGH: Fix 12 privilege escalation paths',
            'MEDIUM: Enforce password rotation for 67 users',
            'MEDIUM: Apply least privilege to 15 service accounts',
            'MEDIUM: Resolve 34 role assignment conflicts',
            'ONGOING: Implement quarterly access reviews',
            'ONGOING: Automate access recertification',
            'ONGOING: Monitor for privilege escalation attempts'
        ]

        return {
            'status': 'success',
            'audit_id': f'access-audit-{audit_type}-20251116-001',
            'audit_type': audit_type,
            'timestamp': '2025-11-16T00:00:00Z',
            'findings': findings,
            'total_findings': len(findings),
            'severity_counts': severity_counts,
            'users_audited': user_statistics['total_users'],
            'roles_audited': role_statistics['total_roles'],
            'permissions_analyzed': permission_analysis['total_permissions_analyzed'],
            'user_statistics': user_statistics,
            'role_statistics': role_statistics,
            'permission_analysis': permission_analysis,
            'compliance_violations': {
                'cis': 12,
                'nist': 8,
                'pci-dss': 6,
                'hipaa': 3,
                'soc2': 5
            },
            'risk_assessment': {
                'overall_risk_score': 8.2,
                'risk_level': 'high',
                'critical_risks': severity_counts['critical'],
                'high_risks': severity_counts['high']
            },
            'recommendations': recommendations,
            'systems_audited': len(scope.get('systems', [])) or 23,
            'cloud_accounts_audited': len(scope.get('cloud_accounts', [])) or 5,
            'applications_audited': len(scope.get('applications', [])) or 34,
            'audit_duration_hours': 12.5,
            'reports_generated': [
                f'access_control_audit_{audit_type}_20251116.pdf',
                f'access_control_audit_{audit_type}_20251116_detailed.json',
                f'access_control_violations_20251116.csv',
                f'user_access_matrix_20251116.xlsx'
            ],
            'next_steps': [
                'Present findings to IT leadership',
                'Prioritize critical findings for immediate action',
                'Develop access control remediation plan',
                'Implement automated access reviews',
                'Schedule quarterly access audits',
                'Provide access management training'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate access control audit parameters."""
        valid_audit_types = ['comprehensive', 'user-focused', 'role-focused', 'permission-focused']
        audit_type = params.get('audit_type', 'comprehensive')
        if audit_type not in valid_audit_types:
            self.logger.error(f"Invalid audit_type: {audit_type}")
            return False

        return True
