"""Handles authentication for TikTokUploader"""
from http import cookiejar
from time import time, sleep

from selenium.webdriver.common.by import By

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

from tiktok_uploader import config, logger
from tiktok_uploader.browsers import get_browser
from tiktok_uploader.utils import green

class AuthBackend:
    """
    Handles authentication for TikTokUploader
    """
    username: str
    password: str
    cookies: list

    def __init__(self, username: str = '', password: str = '',
                 cookies_list: list = None, cookies=None, cookies_str=None, sessionid: str = None):
        """
        Creates the authenticaiton backend

        Keyword arguments:
        - username -> the accounts's username or email
        - password -> the account's password

        - cookies -> a list of cookie dictionaries of cookies which is Selenium-compatable
        """
        if (username and not password) or (password and not username):
            raise InsufficientAuth()

        self.cookies = self.get_cookies(path=cookies) if cookies else []
        self.cookies += self.get_cookies(cookies_str=cookies_str) if cookies_str else []
        self.cookies += cookies_list if cookies_list else []
        self.cookies += [{'name': 'sessionid', 'value': sessionid}] if sessionid else []

        if not (self.cookies or (username and password)):
            raise InsufficientAuth()

        self.username = username
        self.password = password

        if cookies:
            logger.debug(green("Authenticating browser with cookies"))
        elif username and password:
            logger.debug(green("Authenticating browser with username and password"))
        elif sessionid:
            logger.debug(green("Authenticating browser with sessionid"))
        elif cookies_list:
            logger.debug(green("Authenticating browser with cookies_list"))


    def authenticate_agent(self, driver):
        """
        Authenticates the agent using the browser backend
        """
        # tries to use cookies
        if not self.cookies and self.username and self.password:
            self.cookies = login(driver, username=self.username, password=self.password)

        logger.debug(green("Authenticating browser with cookies"))

        driver.get(config['paths']['main'])

        WebDriverWait(driver, config['explicit_wait']).until(EC.title_contains("TikTok"))

        for cookie in self.cookies:
            try:
                driver.add_cookie(cookie)
            except Exception as _:
                logger.error('Failed to add cookie %s', cookie)

        return driver


    def get_cookies(self, path: str = None, cookies_str: str = None) -> dict:
        """
        Gets cookies from the passed file using the netscape standard
        """
        if path:
            with open(path, "r", encoding="utf-8") as file:
                lines = file.read().split("\n")
        else:
            lines = cookies_str.split("\n")

        return_cookies = []
        for line in lines:
            split = line.split('\t')
            if len(split) < 6:
                continue

            split = [x.strip() for x in split]

            try:
                split[4] = int(split[4])
            except ValueError:
                split[4] = None

            return_cookies.append({
                'name': split[5],
                'value': split[6],
                'domain': split[0],
                'path': split[2],
            })

            if split[4]:
                return_cookies[-1]['expiry'] = split[4]
        return return_cookies


def login_accounts(driver=None, accounts=[(None, None)], *args, **kwargs) -> list:
    """
    Authenticates the accounts using the browser backend and saves the required credentials

    Keyword arguments:
    - driver -> the webdriver to use
    - accounts -> a list of tuples of the form (username, password)
    """
    driver = driver or get_browser(headless=True, *args, **kwargs)

    cookies = {}
    for account in accounts:
        username, password = get_username_and_password(account)

        cookies[username] = login(driver, username, password)

    return cookies


def login(driver, username: str, password: str):
    """
    Logs in the user using the email and password
    """
    assert username and password, "Username and password are required"

    # checks if the browser is on TikTok
    if not config['paths']['main'] in driver.current_url:
        driver.get(config['paths']['main'])

    # checks if the user is already logged in
    if driver.get_cookie(config['selectors']['login']['cookie_of_interest']):
        # clears the existing cookies
        driver.delete_all_cookies()

    # goes to the login site
    driver.get(config['paths']['login'])

    # selects and fills the login and the password
    username_field = WebDriverWait(driver, config['explicit_wait']).until(
        EC.presence_of_element_located((By.XPATH, config['selectors']['login']['username_field']))
        )
    username_field.clear()
    username_field.send_keys(username)

    password_field = driver.find_element(By.XPATH, config['selectors']['login']['password_field'])
    password_field.clear()
    password_field.send_keys(password)

    # submits the form
    submit = driver.find_element(By.XPATH, config['selectors']['login']['login_button'])
    submit.click()

    print(f'Complete the captcha for {username}')

    # Wait until the session id cookie is set
    start_time = time()
    while not driver.get_cookie(config['selectors']['login']['cookie_of_interest']):
        sleep(0.5)
        if time() - start_time > config['explicit_wait']:
            raise InsufficientAuth() # TODO: Make this something more real

    # wait until the url changes
    WebDriverWait(driver, config['explicit_wait']).until(EC.url_changes(config['paths']['login']))

    return driver.get_cookies()


def get_username_and_password(login_info: tuple or dict):
    """
    Parses the input into a username and password
    """
    if not isinstance(login_info, dict):
        return login_info[0], login_info[1]

    # checks if they used email or username
    if 'email' in login_info:
        return login_info['email'], login_info['password']
    elif 'username' in login_info:
        return login_info['username'], login_info['password']

    raise InsufficientAuth()


def save_cookies(path, cookies: list):
    """
    Saves the cookies to a netscape file
    """
    # saves the cookies to a file
    cookie_jar = cookiejar.MozillaCookieJar(path)
    cookie_jar.load()

    for cookie in cookies:
        cookie_jar.set_cookie(cookie)

    cookie_jar.save()


class InsufficientAuth(Exception):
    """
    Insufficient authentication:

    > TikTok uses cookies to keep track of the user's authentication or session.

    Either:
        - Use a cookies file passed as the `cookies` argument
            - easily obtained using https://github.com/kairi003/Get-cookies.txt-LOCALLY
        - Use a cookies list passed as the `cookies_list` argument
            - can be obtained from your browser's developer tools under storage -> cookies
            - only the `sessionid` cookie is required
    """

    def __init__(self, message=None):
        super().__init__(message or self.__doc__)