# database_sql.py
import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from models_sql import Base

# 核心：优先读取环境变量中的 PostgreSQL 数据库连接
SQLALCHEMY_DATABASE_URL = os.environ.get("DATABASE_URL", "sqlite:////tmp/comfy_financial.db")

# 兼容性处理：只有在使用降级的 SQLite 时，才需要 check_same_thread=False
connect_args = {"check_same_thread": False} if "sqlite" in SQLALCHEMY_DATABASE_URL else {}

engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args=connect_args)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

def init_sql_db():
    # 启动时自动检查并在云端（或本地）建立缺失的表
    Base.metadata.create_all(bind=engine)

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