import pytest
import pandas as pd
from page_objects.login_page import LoginPage

@pytest.fixture(scope="function")
def logged_in_driver(driver, base_url):
    """
    A fixture that provides a logged-in WebDriver instance.

    It performs the following steps:
    1. Reads valid login credentials from 'data/login_data.csv'.
    2. Navigates to the login page.
    3. Performs the login action.
    4. Yields the driver to the test function.
    
    The test function then runs on a page that requires authentication.
    """
    # 1. 读取有效的登录凭据 (假设第一行为有效数据)
    df = pd.read_csv('data/login_data.csv')
    valid_user = df[df['test_case'] == 'valid_credentials'].iloc[0]
    email = valid_user['email']
    password = valid_user['password']

    # 2. 初始化登录页面并打开
    login_page = LoginPage(driver)
    login_page.open(base_url)

    # 3. 执行登录
    login_page.login(email, password)

    # 4. 将已登录的 driver 提供给测试用例
    yield driver

    # 测试结束后，driver fixture 会自动关闭浏览器