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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# under the License.

import time
from typing import Callable
from typing import Generic
from typing import Literal
from typing import Optional
from typing import Tuple
from typing import Type
from typing import TypeVar
from typing import Union

from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import TimeoutException
from selenium.types import WaitExcTypes
from selenium.webdriver.remote.webdriver import WebDriver
from selenium.webdriver.remote.webelement import WebElement

POLL_FREQUENCY: float = 0.5  # How long to sleep in between calls to the method
IGNORED_EXCEPTIONS: Tuple[Type[Exception]] = (NoSuchElementException,)  # default to be ignored.

D = TypeVar("D", bound=Union[WebDriver, WebElement])
T = TypeVar("T")


class WebDriverWait(Generic[D]):
    def __init__(
        self,
        driver: D,
        timeout: float,
        poll_frequency: float = POLL_FREQUENCY,
        ignored_exceptions: Optional[WaitExcTypes] = None,
    ):
        """Constructor, takes a WebDriver instance and timeout in seconds.

        Attributes:
        -----------
        driver
            - Instance of WebDriver (Ie, Firefox, Chrome or Remote) or
            a WebElement

        timeout
            - Number of seconds before timing out

        poll_frequency
            - Sleep interval between calls
            - By default, it is 0.5 second.

        ignored_exceptions
            - Iterable structure of exception classes ignored during calls.
            - By default, it contains NoSuchElementException only.

        Example:
        --------
        >>> from selenium.webdriver.common.by import By
        >>> from selenium.webdriver.support.wait import WebDriverWait
        >>> from selenium.common.exceptions import ElementNotVisibleException
        >>>
        >>> # Wait until the element is no longer visible
        >>> is_disappeared = WebDriverWait(driver, 30, 1, (ElementNotVisibleException))
        ...     .until_not(lambda x: x.find_element(By.ID, "someId").is_displayed())
        """
        self._driver = driver
        self._timeout = float(timeout)
        self._poll = poll_frequency
        # avoid the divide by zero
        if self._poll == 0:
            self._poll = POLL_FREQUENCY
        exceptions = list(IGNORED_EXCEPTIONS)
        if ignored_exceptions:
            try:
                exceptions.extend(iter(ignored_exceptions))
            except TypeError:  # ignored_exceptions is not iterable
                exceptions.append(ignored_exceptions)
        self._ignored_exceptions = tuple(exceptions)

    def __repr__(self):
        return f'<{type(self).__module__}.{type(self).__name__} (session="{self._driver.session_id}")>'

    def until(self, method: Callable[[D], Union[Literal[False], T]], message: str = "") -> T:
        """Wait until the method returns a value that is not False.

        Calls the method provided with the driver as an argument until the
        return value does not evaluate to ``False``.

        Parameters:
        -----------
        method: callable(WebDriver)
            - A callable object that takes a WebDriver instance as an argument.

        message: str
            - Optional message for :exc:`TimeoutException`

        Return:
        -------
        object: T
            - The result of the last call to `method`

        Raises:
        -------
        TimeoutException
            - If 'method' does not return a truthy value within the WebDriverWait
            object's timeout

        Example:
        --------
        >>> from selenium.webdriver.common.by import By
        >>> from selenium.webdriver.support.ui import WebDriverWait
        >>> from selenium.webdriver.support import expected_conditions as EC

        # Wait until an element is visible on the page
        >>> wait = WebDriverWait(driver, 10)
        >>> element = wait.until(EC.visibility_of_element_located((By.ID, "exampleId")))
        >>> print(element.text)
        """
        screen = None
        stacktrace = None

        end_time = time.monotonic() + self._timeout
        while True:
            try:
                value = method(self._driver)
                if value:
                    return value
            except self._ignored_exceptions as exc:
                screen = getattr(exc, "screen", None)
                stacktrace = getattr(exc, "stacktrace", None)
            if time.monotonic() > end_time:
                break
            time.sleep(self._poll)
        raise TimeoutException(message, screen, stacktrace)

    def until_not(self, method: Callable[[D], T], message: str = "") -> Union[T, Literal[True]]:
        """Wait until the method returns a value that is not False.

        Calls the method provided with the driver as an argument until the
        return value does not evaluate to ``False``.

        Parameters:
        -----------
        method: callable(WebDriver)
            - A callable object that takes a WebDriver instance as an argument.

        message: str
            - Optional message for :exc:`TimeoutException`

        Return:
        -------
        object: T
            - The result of the last call to `method`

        Raises:
        -------
        TimeoutException
            - If 'method' does not return False within the WebDriverWait
            object's timeout

        Example:
        --------
        >>> from selenium.webdriver.common.by import By
        >>> from selenium.webdriver.support.ui import WebDriverWait
        >>> from selenium.webdriver.support import expected_conditions as EC

        # Wait until an element is visible on the page
        >>> wait = WebDriverWait(driver, 10)
        >>> is_disappeared = wait.until_not(EC.visibility_of_element_located(
        ... (By.ID, "exampleId")))
        """
        end_time = time.monotonic() + self._timeout
        while True:
            try:
                value = method(self._driver)
                if not value:
                    return value
            except self._ignored_exceptions:
                return True
            if time.monotonic() > end_time:
                break
            time.sleep(self._poll)
        raise TimeoutException(message)
