import sys
import pytest
from pathlib import Path

# Add backend to path
sys.path.insert(0, str(Path(__file__).parent.parent))

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

# NOTE: This import will fail until models are created in Task 2.1
# This is expected behavior - the models module doesn't exist yet
from app.models import Base


@pytest.fixture(scope="function")
def db_path(tmp_path):
    """临时数据库路径."""
    return tmp_path / "test.db"


@pytest.fixture(scope="function")
def db_engine(db_path):
    """临时数据库引擎."""
    engine = create_engine(f"sqlite:///{db_path}", connect_args={"check_same_thread": False})
    Base.metadata.create_all(engine)
    yield engine
    engine.dispose()


@pytest.fixture(scope="function")
def db_session(db_engine):
    """临时数据库会话."""
    SessionLocal = sessionmaker(bind=db_engine, autocommit=False, autoflush=False)
    session = SessionLocal()
    yield session
    session.close()


@pytest.fixture(scope="function")
def test_encrypt_key():
    """测试加密密钥."""
    import base64
    return base64.b64encode(b'test-key-32-bytes-long-123456789').decode()


@pytest.fixture(scope="function")
def test_env_vars(db_path, test_encrypt_key, monkeypatch):
    """设置测试环境变量."""
    # Clear global settings to ensure fresh config
    import app.config
    app.config._settings = None

    monkeypatch.setenv("GM_ENCRYPT_KEY", test_encrypt_key)
    monkeypatch.setenv("GM_API_TOKEN", "test-token")
    monkeypatch.setenv("GM_DATA_DIR", str(db_path.parent))
    return {
        "GM_ENCRYPT_KEY": test_encrypt_key,
        "GM_API_TOKEN": "test-token",
    }