import time
from datetime import datetime
from app.database import db_manager, CACHE_EXPIRY_HOURS

def clear_cache():
    """Clear the entire cache database"""
    conn = db_manager.get_connection()
    cursor = conn.cursor()
    cursor.execute("DELETE FROM cache")
    conn.commit()
    conn.close()
    return {"status": "success", "message": "Cache cleared successfully"}

def get_cache_stats():
    """Get cache statistics"""
    conn = db_manager.get_connection()
    cursor = conn.cursor()

    # Get total entries
    cursor.execute("SELECT COUNT(*) FROM cache")
    total_entries = cursor.fetchone()[0]

    # Get entries by route
    cursor.execute("SELECT route, COUNT(*) FROM cache GROUP BY route")
    routes = {route: count for route, count in cursor.fetchall()}

    # Get recent entries (last 24 hours)
    recent_timestamp = int(time.time()) - (24 * 60 * 60)
    cursor.execute("SELECT COUNT(*) FROM cache WHERE timestamp > %s", (recent_timestamp,))
    recent_entries = cursor.fetchone()[0]

    # Get oldest entry timestamp
    cursor.execute("SELECT MIN(timestamp) FROM cache")
    oldest_timestamp = cursor.fetchone()[0]
    oldest_date = datetime.fromtimestamp(oldest_timestamp).isoformat() if oldest_timestamp else None

    # Get newest entry timestamp
    cursor.execute("SELECT MAX(timestamp) FROM cache")
    newest_timestamp = cursor.fetchone()[0]
    newest_date = datetime.fromtimestamp(newest_timestamp).isoformat() if newest_timestamp else None

    conn.close()

    return {
        "status": "success",
        "stats": {
            "total_entries": total_entries,
            "entries_by_route": routes,
            "recent_entries": recent_entries,
            "oldest_entry": oldest_date,
            "newest_entry": newest_date,
            "cache_expiry_hours": CACHE_EXPIRY_HOURS,
            "database_type": db_manager.db_type
        }
    }