"""
Malware Scanner Agent

Scans for malware, viruses, trojans, rootkits, and other malicious software
using signature-based detection, heuristics, and behavioral analysis.
"""

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


class MalwareScannerAgent(BaseAgent):
    """
    Malware detection and scanning agent.

    Detects:
    - Viruses and trojans
    - Ransomware
    - Rootkits
    - Spyware and adware
    - Potentially Unwanted Programs (PUPs)
    - Fileless malware
    """

    def __init__(self):
        super().__init__(
            name='malware-scanner',
            description='Scan for malware',
            category='security',
            version='1.0.0',
            tags=['malware', 'virus', 'trojan', 'ransomware', 'antivirus', 'scanning']
        )

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

        Args:
            params: {
                'scan_type': 'quick|full|custom|boot-sector|memory',
                'scan_targets': {
                    'paths': List[str],
                    'drives': List[str],
                    'memory': bool,
                    'processes': bool,
                    'registry': bool,  # Windows
                    'startup_items': bool
                },
                'detection_methods': ['signature', 'heuristic', 'behavioral', 'cloud-lookup'],
                'scan_depth': 'surface|standard|deep',
                'options': {
                    'scan_archives': bool,
                    'scan_email': bool,
                    'scan_network_shares': bool,
                    'follow_symlinks': bool,
                    'exclude_paths': List[str],
                    'file_size_limit_mb': int
                },
                'actions': {
                    'quarantine_infected': bool,
                    'delete_infected': bool,
                    'auto_heal': bool,
                    'prompt_user': bool
                },
                'update_signatures': bool
            }

        Returns:
            {
                'status': 'success|failed',
                'scan_id': str,
                'threats_found': List[Dict],
                'total_threats': int,
                'files_scanned': int,
                'infected_files': int
            }
        """
        scan_type = params.get('scan_type', 'full')
        scan_targets = params.get('scan_targets', {})
        detection_methods = params.get('detection_methods', ['signature', 'heuristic'])
        scan_depth = params.get('scan_depth', 'standard')
        options = params.get('options', {})
        actions = params.get('actions', {})

        self.logger.info(
            f"Malware scan - type: {scan_type}, depth: {scan_depth}"
        )

        # Mock malware scan results
        threats_found = [
            {
                'id': 'MAL-001',
                'severity': 'critical',
                'type': 'Ransomware',
                'name': 'Ransom.Win32.Sodinokibi',
                'variant': 'REvil v2.7',
                'file_path': '/home/user/Downloads/invoice.exe',
                'file_hash': {
                    'md5': 'a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6',
                    'sha1': 'b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0',
                    'sha256': 'c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2'
                },
                'detection_method': 'signature',
                'confidence': 0.99,
                'file_size_bytes': 1245678,
                'first_seen': '2024-10-15',
                'last_modified': '2025-11-16T08:30:00Z',
                'capabilities': [
                    'File encryption',
                    'Network communication',
                    'Process injection',
                    'Anti-debugging',
                    'UAC bypass'
                ],
                'behavior': {
                    'encrypts_files': True,
                    'deletes_shadow_copies': True,
                    'disables_recovery': True,
                    'contacts_c2': True,
                    'spreads_network': True
                },
                'c2_servers': ['185.220.101.45:8080'],
                'action_taken': 'quarantined' if actions.get('quarantine_infected') else 'none',
                'remediation': 'Quarantine file, restore from backup, scan network'
            },
            {
                'id': 'MAL-002',
                'severity': 'critical',
                'type': 'Trojan',
                'name': 'Trojan.Agent.Generic',
                'file_path': '/usr/local/bin/.hidden_process',
                'file_hash': {
                    'md5': 'b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7',
                    'sha256': 'd2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3'
                },
                'detection_method': 'heuristic',
                'confidence': 0.92,
                'file_size_bytes': 256789,
                'capabilities': [
                    'Backdoor access',
                    'Keylogging',
                    'Screen capture',
                    'Data exfiltration',
                    'Remote control'
                ],
                'network_activity': {
                    'c2_server': '92.118.36.199:443',
                    'data_sent_bytes': 15234567,
                    'connections': 47
                },
                'action_taken': 'quarantined' if actions.get('quarantine_infected') else 'none',
                'remediation': 'Remove trojan, change all passwords, scan for data breach'
            },
            {
                'id': 'MAL-003',
                'severity': 'high',
                'type': 'Rootkit',
                'name': 'Rootkit.Linux.Tsunami',
                'file_path': '/lib/modules/kernel-backdoor.ko',
                'detection_method': 'behavioral',
                'confidence': 0.88,
                'rootkit_type': 'Kernel-mode',
                'capabilities': [
                    'Hide processes',
                    'Hide files',
                    'Hide network connections',
                    'Intercept system calls',
                    'Disable security tools'
                ],
                'hidden_processes': ['backdoor_daemon', 'cryptominer'],
                'hidden_files': ['/tmp/.hidden', '/var/.data'],
                'action_taken': 'detected',
                'remediation': 'Boot from clean media, reinstall OS, restore from backup'
            },
            {
                'id': 'MAL-004',
                'severity': 'high',
                'type': 'Spyware',
                'name': 'Spyware.Generic.Keylogger',
                'file_path': '/home/user/.config/systemd/user.conf',
                'detection_method': 'signature',
                'confidence': 0.95,
                'capabilities': [
                    'Keystroke logging',
                    'Clipboard monitoring',
                    'Screenshot capture',
                    'Browser history tracking'
                ],
                'data_collected': {
                    'keystrokes': 125678,
                    'screenshots': 234,
                    'passwords_captured': 47
                },
                'action_taken': 'quarantined' if actions.get('quarantine_infected') else 'none',
                'remediation': 'Remove spyware, change all passwords, enable MFA'
            },
            {
                'id': 'MAL-005',
                'severity': 'medium',
                'type': 'Adware',
                'name': 'Adware.BrowserPlugin',
                'file_path': '/home/user/.mozilla/extensions/plugin.xpi',
                'detection_method': 'signature',
                'confidence': 0.91,
                'capabilities': [
                    'Display advertisements',
                    'Browser hijacking',
                    'Search redirection',
                    'Track browsing history'
                ],
                'action_taken': 'removed' if actions.get('delete_infected') else 'none',
                'remediation': 'Remove adware, reset browser settings'
            },
            {
                'id': 'MAL-006',
                'severity': 'high',
                'type': 'Cryptominer',
                'name': 'Coinminer.XMRig',
                'file_path': '/tmp/kworker',
                'detection_method': 'behavioral',
                'confidence': 0.94,
                'mining_pool': 'pool.minexmr.com:4444',
                'wallet_address': '4AdUndXH...crypto-wallet',
                'cpu_usage': 98.5,
                'estimated_cost_per_month': 2500,
                'action_taken': 'terminated_and_quarantined',
                'remediation': 'Remove miner, identify infection vector, patch vulnerabilities'
            },
            {
                'id': 'MAL-007',
                'severity': 'medium',
                'type': 'PUP',
                'name': 'PUP.Optional.BundledSoftware',
                'file_path': '/opt/bundled-software/toolbar',
                'detection_method': 'signature',
                'confidence': 0.85,
                'action_taken': 'flagged',
                'user_action_required': True,
                'remediation': 'Review and uninstall if unwanted'
            }
        ]

        severity_counts = {
            'critical': sum(1 for t in threats_found if t['severity'] == 'critical'),
            'high': sum(1 for t in threats_found if t['severity'] == 'high'),
            'medium': sum(1 for t in threats_found if t['severity'] == 'medium'),
            'low': sum(1 for t in threats_found if t['severity'] == 'low')
        }

        threat_categories = {
            'Ransomware': 1,
            'Trojan': 1,
            'Rootkit': 1,
            'Spyware': 1,
            'Adware': 1,
            'Cryptominer': 1,
            'PUP': 1
        }

        files_scanned = 125678
        infected_files = len(threats_found)

        return {
            'status': 'success',
            'scan_id': f'malware-scan-{scan_type}-20251116-001',
            'scan_type': scan_type,
            'scan_depth': scan_depth,
            'timestamp_start': '2025-11-16T00:00:00Z',
            'timestamp_end': '2025-11-16T02:15:34Z',
            'scan_duration': '2 hours 15 minutes 34 seconds',
            'threats_found': threats_found,
            'total_threats': len(threats_found),
            'severity_counts': severity_counts,
            'threat_categories': threat_categories,
            'files_scanned': files_scanned,
            'infected_files': infected_files,
            'infection_rate': (infected_files / files_scanned) * 100,
            'files_quarantined': sum(1 for t in threats_found if t.get('action_taken') == 'quarantined'),
            'files_deleted': sum(1 for t in threats_found if t.get('action_taken') == 'removed'),
            'files_healed': 0,
            'files_flagged': sum(1 for t in threats_found if t.get('action_taken') == 'flagged'),
            'scan_statistics': {
                'files_per_second': 17.3,
                'avg_file_size_kb': 245.6,
                'total_data_scanned_gb': 31.2,
                'archives_scanned': 234 if options.get('scan_archives') else 0,
                'emails_scanned': 1567 if options.get('scan_email') else 0,
                'memory_scanned': scan_targets.get('memory', False),
                'processes_scanned': 89 if scan_targets.get('processes') else 0
            },
            'signature_database': {
                'version': '20251116.001',
                'last_update': '2025-11-16T00:00:00Z',
                'signatures_count': 8945678,
                'update_available': False
            },
            'detection_summary': {
                'signature_detections': 4,
                'heuristic_detections': 2,
                'behavioral_detections': 2,
                'cloud_lookup_detections': 0
            },
            'system_impact': {
                'cpu_usage_percent': 45.2,
                'memory_usage_mb': 512,
                'disk_io_mbps': 125.7,
                'performance_impact': 'medium'
            },
            'recommendations': [
                'IMMEDIATE: Address critical ransomware and trojan threats',
                'IMMEDIATE: Investigate rootkit - may require system reinstall',
                'HIGH: Remove spyware and change all passwords',
                'HIGH: Terminate and remove cryptominer',
                'MEDIUM: Remove adware and PUPs',
                'Enable real-time protection',
                'Schedule daily quick scans',
                'Keep signature database updated',
                'Implement application whitelisting',
                'Educate users about malware risks'
            ],
            'quarantine_location': '/var/quarantine/malware-20251116',
            'quarantined_items': [
                t['file_path'] for t in threats_found
                if t.get('action_taken') in ['quarantined', 'terminated_and_quarantined']
            ],
            'reports_generated': [
                f'malware_scan_{scan_type}_20251116.pdf',
                f'malware_scan_{scan_type}_20251116_detailed.json',
                f'infected_files_20251116.csv',
                f'threat_hashes_20251116.txt'
            ],
            'next_steps': [
                'Review and remediate all critical threats',
                'Restore infected files from clean backups',
                'Scan entire network for spread',
                'Update all security software',
                'Implement endpoint protection',
                'Schedule follow-up scan after remediation'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate malware scanning parameters."""
        valid_scan_types = ['quick', 'full', 'custom', 'boot-sector', 'memory']
        scan_type = params.get('scan_type', 'full')
        if scan_type not in valid_scan_types:
            self.logger.error(f"Invalid scan_type: {scan_type}")
            return False

        valid_scan_depths = ['surface', 'standard', 'deep']
        scan_depth = params.get('scan_depth', 'standard')
        if scan_depth not in valid_scan_depths:
            self.logger.error(f"Invalid scan_depth: {scan_depth}")
            return False

        return True
