# database.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import os
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# Retrieve database connection details from environment variables
MYSQL_HOST = os.getenv("MYSQL_HOST", "db")  # Default to 'db' if not set
MYSQL_PORT = os.getenv("MYSQL_PORT", "3306")
MYSQL_DATABASE = os.getenv("MYSQL_DATABASE", "bbapi")
MYSQL_USER = os.getenv("MYSQL_USER", "bbapi")
MYSQL_PASSWORD = os.getenv("MYSQL_PASSWORD", "QQQR5dKS8NYGnYcC")

# Construct the database URL
DATABASE_URL = f"mysql+pymysql://{MYSQL_USER}:{MYSQL_PASSWORD}@{MYSQL_HOST}:{MYSQL_PORT}/{MYSQL_DATABASE}"

# Create SQLAlchemy engine
engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,
    pool_recycle=3600
)

# Create a configured "Session" class
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Base class for your ORM models
Base = declarative_base()

# Dependency to get a database session
from fastapi import Depends
from sqlalchemy.orm import Session

def get_db():
    """
    Dependency that provides a SQLAlchemy session.
    Ensures the session is closed after the request is completed.
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()