import pytest
from selenium import webdriver

expected_title = 'Amazon.com: Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more'
base_url = 'https://www.amazon.com'
search_title = 'Amazon.com: nike air max'

@pytest.fixture()
def env_setup():
    global driver
    global baseUrl
    # we will use Google Chrome in this test. Specify the location of your chromedriver.exe
    driver = webdriver.Chrome("C:\\Users\\yivanov\\Downloads\\chromedriver_win32_76\\chromedriver.exe")
    # maximize browser window to full screen
    driver.maximize_window()
    # wait for 10 seconds till the web page will load
    driver.implicitly_wait(10)
    yield
    # when test is done, close ALL windows of the browser
    driver.quit()

def test_empty_cart(env_setup):
    # navigate to Amazon.com home page
    driver.get(base_url)
    # verify that website title is Amazon.com
    assert expected_title == driver.title
    # locate search field element
    search_field = driver.find_element_by_id("twotabsearchtextbox")
    # enter "nike air max" in the search field
    search_field.send_keys("nike air max")
    # locate search button
    search_button = driver.find_element_by_xpath("//input[@value='Go']")
    # click on 'Search' icon
    search_button.click()
    # verify the page title
    assert search_title == driver.title
    # verify the cart is empty. the number of items is 0
    assert "0" == driver.find_element_by_id("nav-cart-count").text

    # select Nike Air Max 270
    select_nike_air_max_270 = driver.find_element_by_xpath(".//span[contains(text(), 'Nike Air Max 270')]").click()
    # click on size Drop Down menu
    size_dropdown = driver.find_element_by_xpath("//span[@class='a-dropdown-prompt'][contains(text(),'Select')]").click()
    # select '11' size
    select_size = driver.find_element_by_xpath("//a[@id='native_dropdown_selected_size_name_8']").click()
    # click on 'add to cart'
    click_add_to_cart = driver.find_element_by_xpath("//input[@id='add-to-cart-button']").click()

    # verify the number of items is changed from 0 to 1 in the cart
    assert "1" == driver.find_element_by_id("nav-cart-count").text
    # verify "Added to Cart" message is displayed on the screen
    assert "Added to Cart" == driver.find_element_by_xpath("//h1[@class='a-size-medium a-text-bold']").text