"""测试配置：每个测试用例使用隔离的内存数据库。"""

import pytest
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from app.core import db as db_module
from app.models import Base


@pytest.fixture(autouse=True)
def _isolate_db(tmp_path, monkeypatch):
    """每个测试用例：创建独立内存 SQLite → 建表 → 替换全局引擎 → 测试结束自动清理。

    这确保测试之间完全隔离，不共享任何数据。
    """
    test_db_url = f"sqlite:///{tmp_path}/test.db"
    engine = create_engine(test_db_url, connect_args={"check_same_thread": False})

    # 启用 WAL + 外键
    from sqlalchemy import event, text

    @event.listens_for(engine, "connect")
    def _set_pragma(dbapi_conn, _):
        cursor = dbapi_conn.cursor()
        cursor.execute("PRAGMA journal_mode=WAL")
        cursor.execute("PRAGMA foreign_keys=ON")
        cursor.close()

    Base.metadata.create_all(engine)
    test_factory = sessionmaker(bind=engine, expire_on_commit=False)

    # 替换全局引擎和 session 工厂
    monkeypatch.setattr(db_module, "_engine", engine)
    monkeypatch.setattr(db_module, "_session_factory", test_factory)

    # 清空内存 session 存储
    from app.core import session as session_module

    session_module._store.clear()

    yield

    engine.dispose()