from selenium import webdriver
from django.contrib.staticfiles.testing import StaticLiveServerTestCase
from selenium.webdriver.common.keys import Keys
import time
import os
from selenium.common.exceptions import WebDriverException

MAX_WAIT = 10


class NewVisitorTest(StaticLiveServerTestCase):

    def setUp(self):
        self.browser = webdriver.Firefox()
        staging_server = os.environ.get('STAGING_SERVER')
        if staging_server:
            self.live_server_url='http://' + staging_server

    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_for_one_user(self):
        # user goes to our todo list site
        self.browser.get(self.live_server_url)
        # user noticed the page title
        self.assertIn('To-Do', self.browser.title)
        header_text = self.browser.find_element_by_tag_name('h1').text
        self.assertIn('To-Do', header_text)

        # user enters a todo item
        inputbox = self.browser.find_element_by_id('id_new_item')
        self.assertEqual(
            inputbox.get_attribute('placeholder'),
            'Enter a to-do item'
        )
        # user input Buy peacock feathers into textbox
        inputbox.send_keys('Buy peacock feathers')

        # user hits enter then page updates, page shows peacok feather todo list entry
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: Buy peacock feathers')

        # still a text box to add another item, usr enter
        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)

        # page update again
        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')
        # generated unique URL permalink for the list
        # user revisit the permalink and see the same todo list again

    def test_multiple_users_can_start_lists_at_different_urls(self):
        # Edith starts new todo 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')

        # Edith gets a unique URL (permalink)
        edith_list_url = self.browser.current_url
        self.assertRegex(edith_list_url, '/lists/.+')

        # Now a new user francis comes to the site

        # We use a new session with new cookies and etc
        self.browser.quit()
        self.browser = webdriver.Firefox()

        # francis visits home page and Edith's info is not shown
        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)

        # Francis starts a new list by entering a new item
        inputbox = self.browser.find_element_by_id('id_new_item')
        inputbox.send_keys('Buy milk')
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: Buy milk')

        # Francis get his unique URL permalink
        francis_list_url = self.browser.current_url
        self.assertRegex(francis_list_url, '/lists/.+')
        self.assertNotEqual(francis_list_url, edith_list_url)

        # again, no edith's info
        page_text = self.browser.find_element_by_tag_name('body').text
        self.assertNotIn('Buy peacock feathers', page_text)
        self.assertIn('Buy milk', page_text)

        # User goes back to sleep

    def test_layout_and_styling(self):
        # Edith goes to the home page
        self.browser.get(self.live_server_url)
        self.browser.set_window_size(1024, 768)

        # input box centered
        inputbox = self.browser.find_element_by_id('id_new_item')
        self.assertAlmostEqual(
            inputbox.location['x'] + inputbox.size['width']/2,
            512,
            delta=40
        )

        inputbox.send_keys('testing')
        inputbox.send_keys(Keys.ENTER)
        self.wait_for_row_in_list_table('1: testing')
        inputbox = self.browser.find_element_by_id('id_new_item')
        self.assertAlmostEqual(
            inputbox.location['x'] + inputbox.size['width']/2,
            512,
            delta=40
        )
