# -*- coding: utf-8 -*-
# !/usr/bin/env python

"""
监测到 dist/static 文件夹变动后，自动清理chrome缓存
"""
import os
import time

from base import init_env

init_env(interactive=True)

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait

from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler

driver = webdriver.Chrome(executable_path=os.environ['CHROME_PATH'])

OBSERVING_PATH = '.'

def get_clear_browsing_button(driver):
    """Find the "CLEAR BROWSING BUTTON" on the Chrome settings page."""
    return driver.find_element_by_css_selector('* /deep/ #clearBrowsingDataConfirm')


def clear_cache(driver, timeout=60):
    """Clear the cookies and cache for the ChromeDriver instance."""
    # navigate to the settings page
    driver.get('chrome://settings/clearBrowserData')

    # wait for the button to appear
    wait = WebDriverWait(driver, timeout)
    wait.until(get_clear_browsing_button)

    # click the button to clear the cache
    get_clear_browsing_button(driver).click()

    # wait for the button to be gone before returning
    wait.until_not(get_clear_browsing_button)


if __name__ == '__main__':
    print 'starting cache clearer'
    # TODO add handler to clear cache
    event_handler = LoggingEventHandler()
    observer = Observer()
    observer.schedule(event_handler, OBSERVING_PATH, recursive=True)
    #observer.add_handler_for_watch()
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

    clear_cache(driver)