from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker, DeclarativeBase
import os

# 使用绝对路径
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
DATABASE_URL = f"sqlite:///{os.path.join(BASE_DIR, 'data', 'app.db')}"

engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class Base(DeclarativeBase):
    pass


def ensure_schema_compatibility() -> None:
    """Best-effort lightweight migrations for SQLite deployments."""
    if engine.dialect.name != "sqlite":
        return

    with engine.begin() as conn:
        columns = {
            row[1]
            for row in conn.execute(text("PRAGMA table_info(assistants)"))
        }
        if "voice_output_enabled" not in columns:
            conn.execute(
                text(
                    "ALTER TABLE assistants "
                    "ADD COLUMN voice_output_enabled BOOLEAN DEFAULT 1"
                )
            )
            conn.execute(
                text(
                    "UPDATE assistants "
                    "SET voice_output_enabled = 1 "
                    "WHERE voice_output_enabled IS NULL"
                )
            )


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