from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from models import Base, User, UserRole
import os
from dotenv import load_dotenv

load_dotenv()

DATABASE_URL = f"postgresql://{os.getenv('DATABASE_USERNAME')}:{os.getenv('DATABASE_PASSWORD')}@{os.getenv('DATABASE_HOSTNAME')}:{os.getenv('DATABASE_PORT')}/{os.getenv('DATABASE_NAME')}"

engine = create_engine(
    DATABASE_URL,
    pool_size=10,
    max_overflow=20,
    pool_timeout=30,
    pool_recycle=3600,
    pool_pre_ping=True
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    Base.metadata.create_all(bind=engine)
    
    from utils import get_password_hash
    db = SessionLocal()
    try:
        existing_admin = db.query(User).filter(User.role == UserRole.ADMIN).first()
        if not existing_admin:
            default_admin = User(
                username="admin",
                email="admin@example.com",
                password_hash=get_password_hash("admin123"),
                full_name="系统管理员",
                role=UserRole.ADMIN
            )
            db.add(default_admin)
            db.commit()
            print("默认管理员账户已创建 - 用户名: admin, 密码: admin123")
    finally:
        db.close()

        
if __name__ == "__main__":
    print("正在创建数据库表...")
    init_db()
    print("数据库表创建完成！")