"""
SSL/TLS Validator Agent

Validates SSL/TLS configurations, certificates, and security settings
to ensure proper encryption and compliance with security best practices.
"""

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


class SSLTLSValidatorAgent(BaseAgent):
    """
    SSL/TLS validation agent.

    Validates:
    - Certificate validity and chain
    - TLS protocol versions
    - Cipher suites
    - Perfect Forward Secrecy
    - Certificate transparency
    - OCSP/CRL status
    """

    def __init__(self):
        super().__init__(
            name='ssl-tls-validator',
            description='Validate SSL/TLS configurations',
            category='security',
            version='1.0.0',
            tags=['ssl', 'tls', 'certificates', 'encryption', 'validation', 'https']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Validate SSL/TLS configurations.

        Args:
            params: {
                'targets': List[str],  # Domains or IPs
                'port': int,
                'validation_scope': 'basic|standard|comprehensive',
                'checks': {
                    'validate_certificate': bool,
                    'check_expiration': bool,
                    'verify_chain': bool,
                    'check_revocation': bool,
                    'test_protocols': bool,
                    'test_ciphers': bool,
                    'check_vulnerabilities': bool,
                    'test_pfs': bool,
                    'check_hsts': bool,
                    'verify_ct_logs': bool
                },
                'compliance_standards': ['pci-dss', 'hipaa', 'nist'],
                'minimum_tls_version': '1.2|1.3',
                'cipher_requirements': {
                    'require_strong_ciphers': bool,
                    'block_weak_ciphers': bool,
                    'require_pfs': bool
                }
            }

        Returns:
            {
                'status': 'success|failed',
                'validation_id': str,
                'results': List[Dict],
                'overall_grade': str,
                'issues_found': List[Dict]
            }
        """
        targets = params.get('targets', [])
        port = params.get('port', 443)
        validation_scope = params.get('validation_scope', 'standard')
        checks = params.get('checks', {})
        compliance_standards = params.get('compliance_standards', [])
        minimum_tls_version = params.get('minimum_tls_version', '1.2')

        self.logger.info(
            f"Validating SSL/TLS for {len(targets)} targets - scope: {validation_scope}"
        )

        # Mock SSL/TLS validation results
        results = [
            {
                'target': 'example.com:443',
                'ip_address': '203.0.113.10',
                'overall_grade': 'B',
                'certificate': {
                    'subject': 'CN=example.com',
                    'issuer': 'CN=Let\'s Encrypt Authority X3',
                    'valid_from': '2025-10-01T00:00:00Z',
                    'valid_to': '2026-01-01T23:59:59Z',
                    'days_until_expiry': 46,
                    'serial_number': '04:FD:E5:8B:2C:3D:8A:4F',
                    'signature_algorithm': 'SHA256withRSA',
                    'key_type': 'RSA',
                    'key_size': 2048,
                    'san_entries': ['example.com', 'www.example.com', '*.example.com'],
                    'wildcard': True,
                    'extended_validation': False,
                    'self_signed': False,
                    'expired': False,
                    'valid': True
                },
                'certificate_chain': {
                    'chain_valid': True,
                    'chain_length': 3,
                    'certificates': [
                        {'level': 0, 'subject': 'CN=example.com'},
                        {'level': 1, 'subject': 'CN=Let\'s Encrypt Authority X3'},
                        {'level': 2, 'subject': 'CN=DST Root CA X3'}
                    ],
                    'trusted_root': True
                },
                'protocols_supported': {
                    'SSLv2': {'enabled': False, 'status': 'good'},
                    'SSLv3': {'enabled': False, 'status': 'good'},
                    'TLS 1.0': {'enabled': True, 'status': 'insecure'},
                    'TLS 1.1': {'enabled': True, 'status': 'deprecated'},
                    'TLS 1.2': {'enabled': True, 'status': 'good'},
                    'TLS 1.3': {'enabled': False, 'status': 'recommended'}
                },
                'cipher_suites': {
                    'total_supported': 45,
                    'strong': 25,
                    'weak': 12,
                    'insecure': 8,
                    'preferred_cipher': 'TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384',
                    'weak_ciphers_found': [
                        'TLS_RSA_WITH_3DES_EDE_CBC_SHA',
                        'TLS_RSA_WITH_RC4_128_SHA'
                    ]
                },
                'security_features': {
                    'perfect_forward_secrecy': True,
                    'secure_renegotiation': True,
                    'compression_disabled': True,
                    'session_resumption': True,
                    'ocsp_stapling': False,
                    'hsts_enabled': False,
                    'hsts_max_age': None
                },
                'vulnerabilities': [
                    {
                        'name': 'BEAST',
                        'severity': 'medium',
                        'cve': 'CVE-2011-3389',
                        'vulnerable': True,
                        'description': 'Vulnerable to BEAST attack due to TLS 1.0 support'
                    },
                    {
                        'name': 'CRIME',
                        'severity': 'high',
                        'cve': 'CVE-2012-4929',
                        'vulnerable': False,
                        'description': 'TLS compression disabled'
                    },
                    {
                        'name': 'Heartbleed',
                        'severity': 'critical',
                        'cve': 'CVE-2014-0160',
                        'vulnerable': False
                    },
                    {
                        'name': 'POODLE',
                        'severity': 'high',
                        'cve': 'CVE-2014-3566',
                        'vulnerable': False
                    }
                ],
                'revocation_status': {
                    'ocsp_response': 'good',
                    'crl_status': 'not_revoked',
                    'checked_at': '2025-11-16T00:00:00Z'
                },
                'certificate_transparency': {
                    'in_ct_logs': True,
                    'sct_count': 3,
                    'logs': ['Google Argon', 'Cloudflare Nimbus', 'DigiCert Log Server']
                },
                'compliance': {
                    'pci-dss': 'non-compliant',
                    'hipaa': 'non-compliant',
                    'nist': 'partial',
                    'reasons': [
                        'TLS 1.0 and 1.1 enabled (deprecated)',
                        'Weak ciphers enabled',
                        'HSTS not configured'
                    ]
                },
                'issues_found': [
                    {
                        'severity': 'high',
                        'category': 'Deprecated Protocol',
                        'issue': 'TLS 1.0 and 1.1 enabled',
                        'recommendation': 'Disable TLS 1.0 and 1.1, enable only TLS 1.2 and 1.3'
                    },
                    {
                        'severity': 'high',
                        'category': 'Weak Ciphers',
                        'issue': '8 weak cipher suites enabled',
                        'recommendation': 'Disable weak ciphers (3DES, RC4)'
                    },
                    {
                        'severity': 'medium',
                        'category': 'Missing Security Header',
                        'issue': 'HSTS not configured',
                        'recommendation': 'Enable HSTS with max-age of at least 31536000 seconds'
                    },
                    {
                        'severity': 'medium',
                        'category': 'Missing Feature',
                        'issue': 'OCSP stapling not enabled',
                        'recommendation': 'Enable OCSP stapling for better performance and privacy'
                    },
                    {
                        'severity': 'low',
                        'category': 'Protocol Support',
                        'issue': 'TLS 1.3 not enabled',
                        'recommendation': 'Enable TLS 1.3 for improved security and performance'
                    }
                ],
                'recommendations': [
                    'Disable TLS 1.0 and 1.1 immediately',
                    'Remove weak cipher suites',
                    'Enable TLS 1.3',
                    'Configure HSTS with preload',
                    'Enable OCSP stapling',
                    'Consider upgrading to 4096-bit RSA or ECDSA P-384'
                ]
            }
        ]

        # Aggregate statistics
        overall_statistics = {
            'targets_tested': len(targets) if targets else 1,
            'targets_passed': 0,
            'targets_failed': 0,
            'targets_with_warnings': 1,
            'grade_distribution': {
                'A+': 0,
                'A': 0,
                'A-': 0,
                'B': 1,
                'C': 0,
                'D': 0,
                'F': 0
            },
            'common_issues': {
                'deprecated_protocols': 1,
                'weak_ciphers': 1,
                'missing_hsts': 1,
                'certificate_issues': 0,
                'configuration_issues': 2
            }
        }

        issues_summary = [
            {
                'category': 'Deprecated Protocols',
                'severity': 'high',
                'count': 1,
                'affected_targets': ['example.com'],
                'recommendation': 'Disable TLS 1.0 and 1.1 on all servers'
            },
            {
                'category': 'Weak Ciphers',
                'severity': 'high',
                'count': 1,
                'affected_targets': ['example.com'],
                'recommendation': 'Remove 3DES, RC4, and other weak ciphers'
            },
            {
                'category': 'Missing HSTS',
                'severity': 'medium',
                'count': 1,
                'affected_targets': ['example.com'],
                'recommendation': 'Enable HSTS with long max-age and includeSubDomains'
            }
        ]

        return {
            'status': 'success',
            'validation_id': f'ssl-tls-validation-20251116-001',
            'validation_scope': validation_scope,
            'minimum_tls_version': minimum_tls_version,
            'timestamp': '2025-11-16T00:00:00Z',
            'results': results,
            'overall_statistics': overall_statistics,
            'issues_summary': issues_summary,
            'compliance_status': {
                'pci-dss': {
                    'compliant': 0,
                    'non_compliant': 1,
                    'partial': 0
                },
                'hipaa': {
                    'compliant': 0,
                    'non_compliant': 1,
                    'partial': 0
                },
                'nist': {
                    'compliant': 0,
                    'non_compliant': 0,
                    'partial': 1
                }
            },
            'recommendations': [
                'IMMEDIATE: Disable TLS 1.0 and 1.1 across all systems',
                'HIGH: Remove weak and insecure cipher suites',
                'HIGH: Enable HSTS on all HTTPS endpoints',
                'MEDIUM: Enable OCSP stapling',
                'MEDIUM: Enable TLS 1.3',
                'Configure strong cipher preference order',
                'Implement automated certificate renewal',
                'Set up certificate expiration monitoring',
                'Consider using CAA DNS records',
                'Regular security audits and updates'
            ],
            'best_practices': [
                'Use TLS 1.2 or 1.3 only',
                'Enable Perfect Forward Secrecy',
                'Use strong cipher suites only',
                'Enable HSTS with preload',
                'Use 2048-bit or higher RSA keys',
                'Consider ECDSA certificates',
                'Enable OCSP stapling',
                'Disable TLS compression',
                'Implement proper certificate chain',
                'Regular vulnerability scanning'
            ],
            'reports_generated': [
                'ssl_tls_validation_20251116.pdf',
                'ssl_tls_validation_20251116_detailed.json',
                'ssl_tls_issues_20251116.csv',
                'ssl_tls_compliance_20251116.html'
            ],
            'next_steps': [
                'Review and prioritize findings',
                'Update TLS configurations',
                'Test changes in staging environment',
                'Deploy to production',
                'Re-validate after changes',
                'Schedule regular SSL/TLS audits'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate SSL/TLS validation parameters."""
        if not params.get('targets') or len(params.get('targets', [])) == 0:
            self.logger.error("At least one target required")
            return False

        valid_scopes = ['basic', 'standard', 'comprehensive']
        validation_scope = params.get('validation_scope', 'standard')
        if validation_scope not in valid_scopes:
            self.logger.error(f"Invalid validation_scope: {validation_scope}")
            return False

        valid_tls_versions = ['1.0', '1.1', '1.2', '1.3']
        minimum_tls = params.get('minimum_tls_version', '1.2')
        if minimum_tls not in valid_tls_versions:
            self.logger.error(f"Invalid minimum_tls_version: {minimum_tls}")
            return False

        return True
