from django.test import LiveServerTestCase
from selenium import webdriver
from selenium.common.exceptions import WebDriverException
from selenium.webdriver.common.keys import Keys
import time


MAX_WAIT = 10


class NewVisitorTest(LiveServerTestCase):
    def setUp(self):
        self.browser = webdriver.Firefox()

    def tearDown(self):
        self.browser.quit()

    def wait_for_row_in_list_table(self, row_text):
        start_time = time.time()
        while True:
            try:
                table = self.browser.find_element_by_id('id_list_table')
                rows = table.find_elements_by_tag_name('tr')
                self.assertIn(row_text, [row.text for row in rows])
                return
            except (AssertionError, WebDriverException) as e:
                if time.time() - start_time > MAX_WAIT:
                    raise e
                time.sleep(0.5)

    def test_can_start_a_list_and_retrieve_it_later(self):
        # A user heard about a cool new online to-do app. They go
        # to check out the homepage.
        self.browser.get(self.live_server_url)

        # They notice the page title and header mention to-do lists
        self.assertIn('To-Do', self.browser.title)
        header_text = self.browser.find_element_by_tag_name('h1').text
        self.assertIn('To-Do', header_text)

        # They are invited to enter a to-do item straight away
        inputbox = self.browser.find_element_by_id('id_new_item')
        self.assertEqual(inputbox.get_attribute(
            'placeholder'), 'Enter a to-do item')

        # Someone types "Buy peacock feathers" into a text box (Their hobby
        # is tying fly-fishing lures)
        inputbox.send_keys('Buy peacock feathers')

        # When they hit enter, the page updates, and now the page lists
        # "1: Buy peacock feathers" as an item in a to-do list
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: Buy peacock feathers')

        # There is still a text box inviting them to add another item. They
        # enter "Use peacock feathers to make a fly"
        inputbox = self.browser.find_element_by_id('id_new_item')
        inputbox.send_keys('Use peacock feathers to make a fly')
        inputbox.send_keys(Keys.ENTER)

        # The page updates again, and now shows both items on their list
        self.wait_for_row_in_list_table('1: Buy peacock feathers')
        self.wait_for_row_in_list_table(
            '2: Use peacock feathers to make a fly')

        # Satisfied, they go back to sleep

    def test_multiple_users_can_start_lists_at_different_urls(self):
        # A user starts a new to-do list
        self.browser.get(self.live_server_url)
        inputbox = self.browser.find_element_by_id('id_new_item')
        inputbox.send_keys('Buy peacock feathers')
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: Buy peacock feathers')

        # They notice that their list has a unique URL
        user1_list_url = self.browser.current_url
        self.assertRegex(user1_list_url, '/lists/.+')

        # Now, a new user comes along to the site.

        # Meta: We use a new browser session to make sure that no information
        # Meta: of User 1's is coming through from cookies etc
        self.browser.quit()
        self.browser = webdriver.Firefox()

        # User 2 visits the homepage. there is no sign of User 1's
        # list
        self.browser.get(self.live_server_url)
        page_text = self.browser.find_element_by_tag_name('body').text
        self.assertNotIn('Buy peacock feathers', page_text)
        self.assertNotIn('make a fly', page_text)

        # User 2 starts a new list by entering a new item. They
        # are less interesting than User 1...
        inputbox = self.browser.find_element_by_tag_name('id_new_item')
        inputbox.send_keys('Buy milk')
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: Buy milk')

        # User 2 gets their own unique URL
        user2_list_url = self.browser.current_url
        self.assertRegex(user2_list_url, '/lists/.+')
        self.assertNotEqual(user2_list_url, user1_list_url)

        # Again, there is no trace of User 1's list
        page_text = self.browser.find_element_by_tag_name('body').text
        self.assertNotIn('Buy peacock feathers', page_text)
        self.assertIn('Buy milk', page_text)

        # Satisfied, they both go back to sleep
