import os
from pathlib import Path

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

# Get the project root directory (using an absolute path)
PROJECT_ROOT = Path(__file__).parent.parent.parent.absolute()

try:
    # Create the directory for the SQLite database if it doesn't exist
    DB_DIR = PROJECT_ROOT / "app" / "storage" / "db"
    DB_DIR.mkdir(parents=True, exist_ok=True)
    
    # Ensure the directory is writable
    test_file = DB_DIR / ".test_write_access"
    with open(test_file, "w") as f:
        f.write("test")
    os.remove(test_file)
    
    # Use a simplified database path for better compatibility
    DB_FILE = DB_DIR / "db.sqlite"
    SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_FILE}"
    
    print(f"Database URL: {SQLALCHEMY_DATABASE_URL}")
    print(f"Database directory: {DB_DIR}")
    
    engine = create_engine(
        SQLALCHEMY_DATABASE_URL, 
        connect_args={"check_same_thread": False},
        # Echo SQL for debugging (remove in production)
        echo=False,
    )
    SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
    
except Exception as e:
    print(f"Error setting up database connection: {e}")
    raise