# utils/audit.py
import streamlit as st
import logging
import json
import uuid
from datetime import datetime
from typing import Optional, Any

class AuditLogger:
    def __init__(self):
        self.conn = None
        self._setup_logging()

    def _setup_logging(self):
        logging.basicConfig(
            filename='audit.log',
            level=logging.INFO,
            format='%(asctime)s - %(levelname)s - %(message)s'
        )

    def initialize_with_connection(self, conn):
        self.conn = conn

    def log_activity(
        self,
        user_id: str,
        action: str,
        ip_address: Optional[str] = None,
        details: Any = None,
        severity: str = 'info'
    ):
        if not self.conn:
            logging.error("Database connection not initialized")
            return

        try:
            cursor = self.conn.cursor()
            cursor.execute("""
                INSERT INTO audit_logs (
                    id, user_id, action, ip_address, timestamp, details, severity
                ) VALUES (?, ?, ?, ?, ?, ?, ?)
            """, (
                str(uuid.uuid4()),
                user_id,
                action,
                ip_address,
                datetime.now().isoformat(),
                json.dumps(details) if details else None,
                severity
            ))
            self.conn.commit()
            logging.info(f"Audit log: {action} by user {user_id}")
        except Exception as e:
            logging.error(f"Failed to create audit log: {str(e)}")

    def get_user_activity(self, user_id: str, limit: int = 50):
        if not self.conn:
            return []
            
        try:
            cursor = self.conn.cursor()
            cursor.execute("""
                SELECT action, timestamp, details, severity
                FROM audit_logs 
                WHERE user_id = ?
                ORDER BY timestamp DESC
                LIMIT ?
            """, (user_id, limit))
            return cursor.fetchall()
        except Exception as e:
            logging.error(f"Failed to fetch user activity: {str(e)}")
            return []

# Create a single instance
audit_logger = AuditLogger()