"""
PROMETHEUS COMMUNITY EDITION - EXPLOIT DETECTOR

Detects exploit patterns and techniques.

Copyright (c) 2026 Damian Donahue
"""

from typing import List
from .models import ExploitMatch


class ExploitDetector:
    """Exploit pattern detection."""
    
    def __init__(self, intelligence_db: dict):
        """Initialize with intelligence database."""
        self.patterns = intelligence_db.get('exploit_patterns', [])
        print(f"Loaded {len(self.patterns)} exploit patterns")
    
    def detect(self, data: bytes) -> List[ExploitMatch]:
        """Detect exploit patterns in binary data."""
        matches = []
        
        # NOP sled detection (0x90 bytes)
        nop_runs = self._find_runs(data, b'\x90', min_length=10)
        if nop_runs:
            for offset in nop_runs[:5]:  # Report first 5
                matches.append(ExploitMatch(
                    technique="NOP Sled",
                    pattern_type="buffer_overflow",
                    offset=offset,
                    severity="high"
                ))
        
        # Check for patterns in database
        for pattern in self.patterns:
            technique = pattern.get('technique', 'Unknown')
            pattern_type = pattern.get('pattern_type', 'unknown')
            
            # Simple pattern matching (could be enhanced)
            # This is a simplified version
            
        return matches
    
    def _find_runs(self, data: bytes, byte_pattern: bytes, min_length: int = 10) -> List[int]:
        """Find runs of repeated bytes."""
        offsets = []
        current_run = 0
        start_offset = 0
        
        for i, byte in enumerate(data):
            if bytes([byte]) == byte_pattern:
                if current_run == 0:
                    start_offset = i
                current_run += 1
            else:
                if current_run >= min_length:
                    offsets.append(start_offset)
                current_run = 0
        
        if current_run >= min_length:
            offsets.append(start_offset)
        
        return offsets
