"""
Aegis Security System
"""

import hashlib
import secrets
from datetime import datetime, timedelta
from typing import Optional, Dict

class AegisSecurity:
    """Advanced security and authentication system"""
    
    def __init__(self):
        self.sessions = {}
        self.audit_log = []
        
    def authenticate(self, username: str, password: str) -> Optional[Dict]:
        """Authenticate user"""
        # In production, this would check against a database
        hashed_password = hashlib.sha256(password.encode()).hexdigest()
        
        # Simulate authentication
        if username == "admin" and hashed_password == self._get_admin_hash():
            token = secrets.token_hex(32)
            session = {
                "username": username,
                "token": token,
                "created": datetime.now().isoformat(),
                "expires": (datetime.now() + timedelta(hours=24)).isoformat()
            }
            self.sessions[token] = session
            self.log_audit("AUTH_SUCCESS", username, "Authentication successful")
            return session
        
        self.log_audit("AUTH_FAILED", username, "Authentication failed")
        return None
    
    def validate_token(self, token: str) -> bool:
        """Validate session token"""
        if token in self.sessions:
            session = self.sessions[token]
            expires = datetime.fromisoformat(session["expires"])
            if datetime.now() < expires:
                return True
        return False
    
    def log_audit(self, action: str, user: str, details: str):
        """Log security audit event"""
        log_entry = {
            "timestamp": datetime.now().isoformat(),
            "action": action,
            "user": user,
            "details": details,
            "ip": "127.0.0.1"  # In production, get real IP
        }
        self.audit_log.append(log_entry)
    
    def _get_admin_hash(self) -> str:
        """Get admin password hash"""
        # In production, this would be from database
        return hashlib.sha256("admin123".encode()).hexdigest()
