"""
Vulnerability Scanner Agent

Scans systems, applications, and infrastructure for security vulnerabilities
using CVE databases, vulnerability signatures, and configuration checks.
"""

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


class VulnerabilityScannerAgent(BaseAgent):
    """
    Comprehensive vulnerability scanning agent.

    Scans for:
    - Known CVEs and security vulnerabilities
    - Misconfigurations
    - Outdated software versions
    - Missing security patches
    - Weak configurations
    """

    def __init__(self):
        super().__init__(
            name='vulnerability-scanner',
            description='Scan for security vulnerabilities',
            category='security',
            version='1.0.0',
            tags=['security', 'vulnerability', 'cve', 'scanning', 'patches']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Scan for vulnerabilities.

        Args:
            params: {
                'target': str,  # IP, hostname, or network range
                'target_type': 'host|network|application|container|cloud',
                'scan_type': 'full|quick|authenticated|unauthenticated',
                'scan_depth': 'surface|standard|deep',
                'options': {
                    'check_cves': bool,
                    'check_misconfigurations': bool,
                    'check_missing_patches': bool,
                    'check_services': bool,
                    'check_web_apps': bool,
                    'check_databases': bool,
                    'check_network': bool,
                    'severity_threshold': 'low|medium|high|critical'
                },
                'credentials': {
                    'username': str,
                    'password': str,
                    'ssh_key': str
                },
                'exclude_targets': List[str],
                'compliance_checks': ['pci-dss', 'hipaa', 'cis']
            }

        Returns:
            {
                'status': 'success|failed',
                'scan_id': str,
                'vulnerabilities': List[Dict],
                'total_vulnerabilities': int,
                'severity_counts': Dict,
                'risk_score': float,
                'patch_recommendations': List[Dict]
            }
        """
        target = params.get('target')
        target_type = params.get('target_type', 'host')
        scan_type = params.get('scan_type', 'standard')
        scan_depth = params.get('scan_depth', 'standard')
        options = params.get('options', {})

        self.logger.info(
            f"Scanning {target} ({target_type}) for vulnerabilities - {scan_type} scan"
        )

        # Mock vulnerability scan results
        vulnerabilities = [
            {
                'id': 'CVE-2024-12345',
                'severity': 'critical',
                'cvss_score': 9.8,
                'cvss_vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H',
                'title': 'Remote Code Execution in OpenSSH',
                'description': 'A critical vulnerability allowing remote code execution',
                'affected_component': 'openssh-server',
                'affected_version': '8.2p1',
                'fixed_version': '8.9p1',
                'cwe': 'CWE-78',
                'exploit_available': True,
                'exploit_maturity': 'functional',
                'patch_available': True,
                'vendor_url': 'https://www.openssh.com/security.html',
                'published_date': '2024-10-15',
                'discovered_date': '2024-10-01'
            },
            {
                'id': 'CVE-2024-54321',
                'severity': 'high',
                'cvss_score': 8.1,
                'cvss_vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N',
                'title': 'SQL Injection in Apache Tomcat',
                'description': 'SQL injection vulnerability in user authentication',
                'affected_component': 'apache-tomcat',
                'affected_version': '9.0.45',
                'fixed_version': '9.0.62',
                'cwe': 'CWE-89',
                'exploit_available': True,
                'exploit_maturity': 'proof-of-concept',
                'patch_available': True,
                'vendor_url': 'https://tomcat.apache.org/security-9.html'
            },
            {
                'id': 'CVE-2024-11111',
                'severity': 'high',
                'cvss_score': 7.5,
                'cvss_vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N',
                'title': 'Information Disclosure in Nginx',
                'description': 'Sensitive information disclosure vulnerability',
                'affected_component': 'nginx',
                'affected_version': '1.18.0',
                'fixed_version': '1.22.1',
                'cwe': 'CWE-200',
                'exploit_available': False,
                'patch_available': True
            },
            {
                'id': 'MISC-CONFIG-001',
                'severity': 'medium',
                'cvss_score': 5.3,
                'title': 'Weak SSL/TLS Configuration',
                'description': 'Server supports weak SSL/TLS protocols (TLS 1.0, 1.1)',
                'affected_component': 'web-server',
                'category': 'misconfiguration',
                'remediation': 'Disable TLS 1.0 and 1.1, enable only TLS 1.2 and 1.3'
            },
            {
                'id': 'MISC-CONFIG-002',
                'severity': 'medium',
                'cvss_score': 6.1,
                'title': 'Missing Security Headers',
                'description': 'HTTP security headers not configured',
                'affected_component': 'web-server',
                'category': 'misconfiguration',
                'missing_headers': [
                    'Strict-Transport-Security',
                    'X-Frame-Options',
                    'X-Content-Type-Options',
                    'Content-Security-Policy'
                ],
                'remediation': 'Configure recommended security headers'
            }
        ]

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

        # Calculate risk score based on CVSS scores
        cvss_scores = [v.get('cvss_score', 0) for v in vulnerabilities]
        risk_score = max(cvss_scores) if cvss_scores else 0

        patch_recommendations = [
            {
                'package': 'openssh-server',
                'current_version': '8.2p1',
                'recommended_version': '8.9p1',
                'priority': 'critical',
                'fixes_cve': ['CVE-2024-12345'],
                'installation_command': 'apt-get update && apt-get install openssh-server'
            },
            {
                'package': 'apache-tomcat',
                'current_version': '9.0.45',
                'recommended_version': '9.0.62',
                'priority': 'high',
                'fixes_cve': ['CVE-2024-54321']
            },
            {
                'package': 'nginx',
                'current_version': '1.18.0',
                'recommended_version': '1.22.1',
                'priority': 'high',
                'fixes_cve': ['CVE-2024-11111']
            }
        ]

        return {
            'status': 'success',
            'scan_id': f'vuln-scan-{target_type}-20251116-001',
            'target': target,
            'target_type': target_type,
            'scan_type': scan_type,
            'scan_depth': scan_depth,
            'timestamp': '2025-11-16T00:00:00Z',
            'vulnerabilities': vulnerabilities,
            'total_vulnerabilities': len(vulnerabilities),
            'severity_counts': severity_counts,
            'risk_score': risk_score,
            'risk_level': 'critical' if risk_score >= 9.0 else 'high' if risk_score >= 7.0 else 'medium',
            'exploitable_vulnerabilities': sum(1 for v in vulnerabilities if v.get('exploit_available')),
            'patchable_vulnerabilities': sum(1 for v in vulnerabilities if v.get('patch_available')),
            'patch_recommendations': patch_recommendations,
            'hosts_scanned': 15,
            'services_detected': 47,
            'open_ports': [22, 80, 443, 3306, 5432, 8080],
            'scan_duration_seconds': 342.5,
            'compliance_status': {
                'pci-dss': 'non-compliant',
                'hipaa': 'non-compliant',
                'cis': 'partial'
            },
            'next_steps': [
                'Patch critical CVE-2024-12345 immediately',
                'Update Apache Tomcat to fix SQL injection',
                'Configure SSL/TLS to disable weak protocols',
                'Add missing security headers',
                'Schedule follow-up scan after patching'
            ],
            'reports_generated': [
                f'vulnerability_report_{target_type}_20251116.pdf',
                f'vulnerability_report_{target_type}_20251116.json',
                f'vulnerability_report_{target_type}_20251116.html'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate vulnerability scanning parameters."""
        if 'target' not in params:
            self.logger.error("Missing required field: target")
            return False

        valid_target_types = ['host', 'network', 'application', 'container', 'cloud']
        target_type = params.get('target_type', 'host')
        if target_type not in valid_target_types:
            self.logger.error(f"Invalid target_type: {target_type}")
            return False

        valid_scan_types = ['full', 'quick', 'authenticated', 'unauthenticated', 'standard']
        scan_type = params.get('scan_type', 'standard')
        if scan_type not in valid_scan_types:
            self.logger.error(f"Invalid scan_type: {scan_type}")
            return False

        return True
