@@ -888,6 +888,17 @@ class WebDriver(BaseWebDriver):
         """
         self.execute(Command.MINIMIZE_WINDOW)
 
+    def print_page(self, print_option_arg = None):
+        """
+        Takes PDF of the current page.
+        The driver makes a best effort to return a PDF based on the provided parameters.
+        """
+        options = {}
+        if print_option_arg:
+            options = print_option_arg.print_options
+
+        return self.execute(Command.PRINT_PAGE, options)['value']
+
     @property
     def switch_to(self):
         """
# Licensed to the Software Freedom Conservancy (SFC) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The SFC licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

"""The WebDriver implementation."""

from abc import ABCMeta
import base64
import copy
from contextlib import (contextmanager, asynccontextmanager)
import importlib
import pkgutil
import warnings
import sys

from .command import Command
from .errorhandler import ErrorHandler
from .file_detector import FileDetector, LocalFileDetector
from .mobile import Mobile
from .remote_connection import RemoteConnection
from .script_key import ScriptKey
from .switch_to import SwitchTo
from .webelement import WebElement

from selenium.common.exceptions import (InvalidArgumentException,
                                        JavascriptException,
                                        WebDriverException,
                                        NoSuchCookieException,
                                        UnknownMethodException)
from selenium.webdriver.common.by import By
from selenium.webdriver.common.timeouts import Timeouts
from selenium.webdriver.common.html5.application_cache import ApplicationCache
from selenium.webdriver.support.relative_locator import RelativeBy

from six import add_metaclass

try:
    str = basestring
except NameError:
    pass

cdp = None


def import_cdp():
    global cdp
    if cdp is None:
        cdp = importlib.import_module("selenium.webdriver.common.bidi.cdp")


_W3C_CAPABILITY_NAMES = frozenset([
    'acceptInsecureCerts',
    'browserName',
    'browserVersion',
    'platformName',
    'pageLoadStrategy',
    'proxy',
    'setWindowRect',
    'timeouts',
    'unhandledPromptBehavior',
    'strictFileInteractability'
])

_OSS_W3C_CONVERSION = {
    'acceptSslCerts': 'acceptInsecureCerts',
    'version': 'browserVersion',
    'platform': 'platformName'
}

devtools = None


def _make_w3c_caps(caps):
    """Makes a W3C alwaysMatch capabilities object.

    Filters out capability names that are not in the W3C spec. Spec-compliant
    drivers will reject requests containing unknown capability names.

    Moves the Firefox profile, if present, from the old location to the new Firefox
    options object.

    :Args:
     - caps - A dictionary of capabilities requested by the caller.
    """
    caps = copy.deepcopy(caps)
    profile = caps.get('firefox_profile')
    always_match = {}
    if caps.get('proxy') and caps['proxy'].get('proxyType'):
        caps['proxy']['proxyType'] = caps['proxy']['proxyType'].lower()
    for k, v in caps.items():
        if v and k in _OSS_W3C_CONVERSION:
            always_match[_OSS_W3C_CONVERSION[k]] = v.lower() if k == 'platform' else v
        if k in _W3C_CAPABILITY_NAMES or ':' in k:
            always_match[k] = v
    if profile:
        moz_opts = always_match.get('moz:firefoxOptions', {})
        # If it's already present, assume the caller did that intentionally.
        if 'profile' not in moz_opts:
            # Don't mutate the original capabilities.
            new_opts = copy.deepcopy(moz_opts)
            new_opts['profile'] = profile
            always_match['moz:firefoxOptions'] = new_opts
    return {"firstMatch": [{}], "alwaysMatch": always_match}


def get_remote_connection(capabilities, command_executor, keep_alive, ignore_local_proxy=False):
    from selenium.webdriver.chromium.remote_connection import ChromiumRemoteConnection
    from selenium.webdriver.safari.remote_connection import SafariRemoteConnection
    from selenium.webdriver.firefox.remote_connection import FirefoxRemoteConnection

    candidates = [RemoteConnection] + [ChromiumRemoteConnection, SafariRemoteConnection, FirefoxRemoteConnection]
    handler = next(
        (c for c in candidates if c.browser_name == capabilities.get('browserName')),
        RemoteConnection
    )

    return handler(command_executor, keep_alive=keep_alive, ignore_proxy=ignore_local_proxy)


@add_metaclass(ABCMeta)
class BaseWebDriver(object):
    """
    Abstract Base Class for all Webdriver subtypes.
    ABC's allow custom implementations of Webdriver to be registered so that isinstance type checks
    will succeed.
    """
    # TODO: After dropping Python 2, use ABC instead of ABCMeta and remove metaclass decorator.


class WebDriver(BaseWebDriver):
    """
    Controls a browser by sending commands to a remote server.
    This server is expected to be running the WebDriver wire protocol
    as defined at
    https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol

    :Attributes:
     - session_id - String ID of the browser session started and controlled by this WebDriver.
     - capabilities - Dictionary of effective capabilities of this browser session as returned
         by the remote server. See https://github.com/SeleniumHQ/selenium/wiki/DesiredCapabilities
     - command_executor - remote_connection.RemoteConnection object used to execute commands.
     - error_handler - errorhandler.ErrorHandler object used to handle errors.
    """

    _web_element_cls = WebElement

    def __init__(self, command_executor='http://127.0.0.1:4444',
                 desired_capabilities=None, browser_profile=None, proxy=None,
                 keep_alive=True, file_detector=None, options=None):
        """
        Create a new driver that will issue commands using the wire protocol.

        :Args:
         - command_executor - Either a string representing URL of the remote server or a custom
             remote_connection.RemoteConnection object. Defaults to 'http://127.0.0.1:4444/wd/hub'.
         - desired_capabilities - A dictionary of capabilities to request when
             starting the browser session. Required parameter.
         - browser_profile - A selenium.webdriver.firefox.firefox_profile.FirefoxProfile object.
             Only used if Firefox is requested. Optional.
         - proxy - A selenium.webdriver.common.proxy.Proxy object. The browser session will
             be started with given proxy settings, if possible. Optional.
         - keep_alive - Whether to configure remote_connection.RemoteConnection to use
             HTTP keep-alive. Defaults to True.
         - file_detector - Pass custom file detector object during instantiation. If None,
             then default LocalFileDetector() will be used.
         - options - instance of a driver options.Options class
        """
        capabilities = {}
        _ignore_local_proxy = False
        if options is not None:
            capabilities = options.to_capabilities()
            _ignore_local_proxy = options._ignore_local_proxy
        if desired_capabilities is not None:
            if not isinstance(desired_capabilities, dict):
                raise WebDriverException("Desired Capabilities must be a dictionary")
            else:
                capabilities.update(desired_capabilities)
        self.command_executor = command_executor
        if isinstance(self.command_executor, (str, bytes)):
            self.command_executor = get_remote_connection(capabilities, command_executor=command_executor,
                                                          keep_alive=keep_alive,
                                                          ignore_local_proxy=_ignore_local_proxy)
        self._is_remote = True
        self.session_id = None
        self.caps = {}
        self.pinned_scripts = {}
        self.error_handler = ErrorHandler()
        self.start_client()
        self.start_session(capabilities, browser_profile)
        self._switch_to = SwitchTo(self)
        self._mobile = Mobile(self)
        self.file_detector = file_detector or LocalFileDetector()

    def __repr__(self):
        return '<{0.__module__}.{0.__name__} (session="{1}")>'.format(
            type(self), self.session_id)

    def __enter__(self):
        return self

    def __exit__(self, *args):
        self.quit()

    @contextmanager
    def file_detector_context(self, file_detector_class, *args, **kwargs):
        """
        Overrides the current file detector (if necessary) in limited context.
        Ensures the original file detector is set afterwards.

        Example:

        with webdriver.file_detector_context(UselessFileDetector):
            someinput.send_keys('/etc/hosts')

        :Args:
         - file_detector_class - Class of the desired file detector. If the class is different
             from the current file_detector, then the class is instantiated with args and kwargs
             and used as a file detector during the duration of the context manager.
         - args - Optional arguments that get passed to the file detector class during
             instantiation.
         - kwargs - Keyword arguments, passed the same way as args.
        """
        last_detector = None
        if not isinstance(self.file_detector, file_detector_class):
            last_detector = self.file_detector
            self.file_detector = file_detector_class(*args, **kwargs)
        try:
            yield
        finally:
            if last_detector is not None:
                self.file_detector = last_detector

    @property
    def mobile(self):
        return self._mobile

    @property
    def name(self):
        """Returns the name of the underlying browser for this instance.

        :Usage:
            ::

                name = driver.name
        """
        if 'browserName' in self.caps:
            return self.caps['browserName']
        else:
            raise KeyError('browserName not specified in session capabilities')

    def start_client(self):
        """
        Called before starting a new session. This method may be overridden
        to define custom startup behavior.
        """
        pass

    def stop_client(self):
        """
        Called after executing a quit command. This method may be overridden
        to define custom shutdown behavior.
        """
        pass

    def start_session(self, capabilities, browser_profile=None):
        """
        Creates a new session with the desired capabilities.

        :Args:
         - browser_name - The name of the browser to request.
         - version - Which browser version to request.
         - platform - Which platform to request the browser on.
         - javascript_enabled - Whether the new session should support JavaScript.
         - browser_profile - A selenium.webdriver.firefox.firefox_profile.FirefoxProfile object. Only used if Firefox is requested.
        """
        if not isinstance(capabilities, dict):
            raise InvalidArgumentException("Capabilities must be a dictionary")
        if browser_profile:
            if "moz:firefoxOptions" in capabilities:
                capabilities["moz:firefoxOptions"]["profile"] = browser_profile.encoded
            else:
                capabilities.update({'firefox_profile': browser_profile.encoded})
        w3c_caps = _make_w3c_caps(capabilities)
        parameters = {"capabilities": w3c_caps,
                      "desiredCapabilities": capabilities}
        response = self.execute(Command.NEW_SESSION, parameters)
        if 'sessionId' not in response:
            response = response['value']
        self.session_id = response['sessionId']
        self.caps = response.get('value')

        # if capabilities is none we are probably speaking to
        # a W3C endpoint
        if self.caps is None:
            self.caps = response.get('capabilities')

        # Double check to see if we have a W3C Compliant browser
        self.w3c = response.get('status') is None
        self.command_executor.w3c = self.w3c

    def _wrap_value(self, value):
        if isinstance(value, dict):
            converted = {}
            for key, val in value.items():
                converted[key] = self._wrap_value(val)
            return converted
        elif isinstance(value, self._web_element_cls):
            return {'ELEMENT': value.id, 'element-6066-11e4-a52e-4f735466cecf': value.id}
        elif isinstance(value, list):
            return list(self._wrap_value(item) for item in value)
        else:
            return value

    def create_web_element(self, element_id):
        """Creates a web element with the specified `element_id`."""
        return self._web_element_cls(self, element_id, w3c=self.w3c)

    def _unwrap_value(self, value):
        if isinstance(value, dict):
            if 'ELEMENT' in value or 'element-6066-11e4-a52e-4f735466cecf' in value:
                wrapped_id = value.get('ELEMENT', None)
                if wrapped_id:
                    return self.create_web_element(value['ELEMENT'])
                else:
                    return self.create_web_element(value['element-6066-11e4-a52e-4f735466cecf'])
            else:
                for key, val in value.items():
                    value[key] = self._unwrap_value(val)
                return value
        elif isinstance(value, list):
            return list(self._unwrap_value(item) for item in value)
        else:
            return value

    def execute(self, driver_command, params=None):
        """
        Sends a command to be executed by a command.CommandExecutor.

        :Args:
         - driver_command: The name of the command to execute as a string.
         - params: A dictionary of named parameters to send with the command.

        :Returns:
          The command's JSON response loaded into a dictionary object.
        """
        if self.session_id is not None:
            if not params:
                params = {'sessionId': self.session_id}
            elif 'sessionId' not in params:
                params['sessionId'] = self.session_id

        params = self._wrap_value(params)
        response = self.command_executor.execute(driver_command, params)
        if response:
            self.error_handler.check_response(response)
            response['value'] = self._unwrap_value(
                response.get('value', None))
            return response
        # If the server doesn't send a response, assume the command was
        # a success
        return {'success': 0, 'value': None, 'sessionId': self.session_id}

    def get(self, url):
        """
        Loads a web page in the current browser session.
        """
        self.execute(Command.GET, {'url': url})

    @property
    def title(self):
        """Returns the title of the current page.

        :Usage:
            ::

                title = driver.title
        """
        resp = self.execute(Command.GET_TITLE)
        return resp['value'] if resp['value'] is not None else ""

    def find_element_by_id(self, id_):
        """Finds an element by id.

        :Args:
         - id\\_ - The id of the element to be found.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_id('foo')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.ID, value=id_)

    def find_elements_by_id(self, id_):
        """
        Finds multiple elements by id.

        :Args:
         - id\\_ - The id of the elements to be found.

        :Returns:
         - list of WebElement - a list with elements if any was found.  An
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_id('foo')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.ID, value=id_)

    def find_element_by_xpath(self, xpath):
        """
        Finds an element by xpath.

        :Args:
         - xpath - The xpath locator of the element to find.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_xpath('//div/td[1]')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.XPATH, value=xpath)

    def find_elements_by_xpath(self, xpath):
        """
        Finds multiple elements by xpath.

        :Args:
         - xpath - The xpath locator of the elements to be found.

        :Returns:
         - list of WebElement - a list with elements if any was found.  An
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_xpath("//div[contains(@class, 'foo')]")
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.XPATH, value=xpath)

    def find_element_by_link_text(self, link_text):
        """
        Finds an element by link text.

        :Args:
         - link_text: The text of the element to be found.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_link_text('Sign In')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.LINK_TEXT, value=link_text)

    def find_elements_by_link_text(self, text):
        """
        Finds elements by link text.

        :Args:
         - link_text: The text of the elements to be found.

        :Returns:
         - list of webelement - a list with elements if any was found.  an
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_link_text('Sign In')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.LINK_TEXT, value=text)

    def find_element_by_partial_link_text(self, link_text):
        """
        Finds an element by a partial match of its link text.

        :Args:
         - link_text: The text of the element to partially match on.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_partial_link_text('Sign')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.PARTIAL_LINK_TEXT, value=link_text)

    def find_elements_by_partial_link_text(self, link_text):
        """
        Finds elements by a partial match of their link text.

        :Args:
         - link_text: The text of the element to partial match on.

        :Returns:
         - list of webelement - a list with elements if any was found.  an
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_partial_link_text('Sign')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.PARTIAL_LINK_TEXT, value=link_text)

    def find_element_by_name(self, name):
        """
        Finds an element by name.

        :Args:
         - name: The name of the element to find.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_name('foo')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.NAME, value=name)

    def find_elements_by_name(self, name):
        """
        Finds elements by name.

        :Args:
         - name: The name of the elements to find.

        :Returns:
         - list of webelement - a list with elements if any was found.  an
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_name('foo')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.NAME, value=name)

    def find_element_by_tag_name(self, name):
        """
        Finds an element by tag name.

        :Args:
         - name - name of html tag (eg: h1, a, span)

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_tag_name('h1')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.TAG_NAME, value=name)

    def find_elements_by_tag_name(self, name):
        """
        Finds elements by tag name.

        :Args:
         - name - name of html tag (eg: h1, a, span)

        :Returns:
         - list of WebElement - a list with elements if any was found.  An
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_tag_name('h1')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.TAG_NAME, value=name)

    def find_element_by_class_name(self, name):
        """
        Finds an element by class name.

        :Args:
         - name: The class name of the element to find.

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_class_name('foo')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.CLASS_NAME, value=name)

    def find_elements_by_class_name(self, name):
        """
        Finds elements by class name.

        :Args:
         - name: The class name of the elements to find.

        :Returns:
         - list of WebElement - a list with elements if any was found.  An
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_class_name('foo')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.CLASS_NAME, value=name)

    def find_element_by_css_selector(self, css_selector):
        """
        Finds an element by css selector.

        :Args:
         - css_selector - CSS selector string, ex: 'a.nav#home'

        :Returns:
         - WebElement - the element if it was found

        :Raises:
         - NoSuchElementException - if the element wasn't found

        :Usage:
            ::

                element = driver.find_element_by_css_selector('#foo')
        """
        warnings.warn("find_element_by_* commands are deprecated. Please use find_element() instead")
        return self.find_element(by=By.CSS_SELECTOR, value=css_selector)

    def find_elements_by_css_selector(self, css_selector):
        """
        Finds elements by css selector.

        :Args:
         - css_selector - CSS selector string, ex: 'a.nav#home'

        :Returns:
         - list of WebElement - a list with elements if any was found.  An
           empty list if not

        :Usage:
            ::

                elements = driver.find_elements_by_css_selector('.foo')
        """
        warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
        return self.find_elements(by=By.CSS_SELECTOR, value=css_selector)

    def pin_script(self, script):
        """

        """
        script_key = ScriptKey()
        self.pinned_scripts[script_key.id] = script
        return script_key

    def unpin(self, script_key):
        """

        """
        self.pinned_scripts.pop(script_key.id)

    def get_pinned_scripts(self):
        """

        """
        return list(self.pinned_scripts.keys())

    def execute_script(self, script, *args):
        """
        Synchronously Executes JavaScript in the current window/frame.

        :Args:
         - script: The JavaScript to execute.
         - \\*args: Any applicable arguments for your JavaScript.

        :Usage:
            ::

                driver.execute_script('return document.title;')
        """
        if isinstance(script, ScriptKey):
            try:
                script = self.pinned_scripts[script.id]
            except KeyError:
                raise JavascriptException("Pinned script could not be found")

        converted_args = list(args)
        command = None
        if self.w3c:
            command = Command.W3C_EXECUTE_SCRIPT
        else:
            command = Command.EXECUTE_SCRIPT

        return self.execute(command, {
            'script': script,
            'args': converted_args})['value']

    def execute_async_script(self, script, *args):
        """
        Asynchronously Executes JavaScript in the current window/frame.

        :Args:
         - script: The JavaScript to execute.
         - \\*args: Any applicable arguments for your JavaScript.

        :Usage:
            ::

                script = "var callback = arguments[arguments.length - 1]; " \\
                         "window.setTimeout(function(){ callback('timeout') }, 3000);"
                driver.execute_async_script(script)
        """
        converted_args = list(args)
        if self.w3c:
            command = Command.W3C_EXECUTE_SCRIPT_ASYNC
        else:
            command = Command.EXECUTE_ASYNC_SCRIPT

        return self.execute(command, {
            'script': script,
            'args': converted_args})['value']

    @property
    def current_url(self):
        """
        Gets the URL of the current page.

        :Usage:
            ::

                driver.current_url
        """
        return self.execute(Command.GET_CURRENT_URL)['value']

    @property
    def page_source(self):
        """
        Gets the source of the current page.

        :Usage:
            ::

                driver.page_source
        """
        return self.execute(Command.GET_PAGE_SOURCE)['value']

    def close(self):
        """
        Closes the current window.

        :Usage:
            ::

                driver.close()
        """
        self.execute(Command.CLOSE)

    def quit(self):
        """
        Quits the driver and closes every associated window.

        :Usage:
            ::

                driver.quit()
        """
        try:
            self.execute(Command.QUIT)
        finally:
            self.stop_client()
            self.command_executor.close()

    @property
    def current_window_handle(self):
        """
        Returns the handle of the current window.

        :Usage:
            ::

                driver.current_window_handle
        """
        if self.w3c:
            return self.execute(Command.W3C_GET_CURRENT_WINDOW_HANDLE)['value']
        else:
            return self.execute(Command.GET_CURRENT_WINDOW_HANDLE)['value']

    @property
    def window_handles(self):
        """
        Returns the handles of all windows within the current session.

        :Usage:
            ::

                driver.window_handles
        """
        if self.w3c:
            return self.execute(Command.W3C_GET_WINDOW_HANDLES)['value']
        else:
            return self.execute(Command.GET_WINDOW_HANDLES)['value']

    def maximize_window(self):
        """
        Maximizes the current window that webdriver is using
        """
        params = None
        command = Command.W3C_MAXIMIZE_WINDOW
        if not self.w3c:
            command = Command.MAXIMIZE_WINDOW
            params = {'windowHandle': 'current'}
        self.execute(command, params)

    def fullscreen_window(self):
        """
        Invokes the window manager-specific 'full screen' operation
        """
        self.execute(Command.FULLSCREEN_WINDOW)

    def minimize_window(self):
        """
        Invokes the window manager-specific 'minimize' operation
        """
        self.execute(Command.MINIMIZE_WINDOW)

    @property
    def switch_to(self):
        """
        :Returns:
            - SwitchTo: an object containing all options to switch focus into

        :Usage:
            ::

                element = driver.switch_to.active_element
                alert = driver.switch_to.alert
                driver.switch_to.default_content()
                driver.switch_to.frame('frame_name')
                driver.switch_to.frame(1)
                driver.switch_to.frame(driver.find_elements_by_tag_name("iframe")[0])
                driver.switch_to.parent_frame()
                driver.switch_to.window('main')
        """
        return self._switch_to

    # Navigation
    def back(self):
        """
        Goes one step backward in the browser history.

        :Usage:
            ::

                driver.back()
        """
        self.execute(Command.GO_BACK)

    def forward(self):
        """
        Goes one step forward in the browser history.

        :Usage:
            ::

                driver.forward()
        """
        self.execute(Command.GO_FORWARD)

    def refresh(self):
        """
        Refreshes the current page.

        :Usage:
            ::

                driver.refresh()
        """
        self.execute(Command.REFRESH)

    # Options
    def get_cookies(self):
        """
        Returns a set of dictionaries, corresponding to cookies visible in the current session.

        :Usage:
            ::

                driver.get_cookies()
        """
        return self.execute(Command.GET_ALL_COOKIES)['value']

    def get_cookie(self, name):
        """
        Get a single cookie by name. Returns the cookie if found, None if not.

        :Usage:
            ::

                driver.get_cookie('my_cookie')
        """
        if self.w3c:
            try:
                return self.execute(Command.GET_COOKIE, {'name': name})['value']
            except NoSuchCookieException:
                return None
        else:
            cookies = self.get_cookies()
            for cookie in cookies:
                if cookie['name'] == name:
                    return cookie
            return None

    def delete_cookie(self, name):
        """
        Deletes a single cookie with the given name.

        :Usage:
            ::

                driver.delete_cookie('my_cookie')
        """
        self.execute(Command.DELETE_COOKIE, {'name': name})

    def delete_all_cookies(self):
        """
        Delete all cookies in the scope of the session.

        :Usage:
            ::

                driver.delete_all_cookies()
        """
        self.execute(Command.DELETE_ALL_COOKIES)

    def add_cookie(self, cookie_dict):
        """
        Adds a cookie to your current session.

        :Args:
         - cookie_dict: A dictionary object, with required keys - "name" and "value";
            optional keys - "path", "domain", "secure", "expiry", "sameSite"

        Usage:
            driver.add_cookie({'name' : 'foo', 'value' : 'bar'})
            driver.add_cookie({'name' : 'foo', 'value' : 'bar', 'path' : '/'})
            driver.add_cookie({'name' : 'foo', 'value' : 'bar', 'path' : '/', 'secure':True})
            driver.add_cookie({'name': 'foo', 'value': 'bar', 'sameSite': 'Strict'})

        """
        if 'sameSite' in cookie_dict:
            assert cookie_dict['sameSite'] in ['Strict', 'Lax']
            self.execute(Command.ADD_COOKIE, {'cookie': cookie_dict})
        else:
            self.execute(Command.ADD_COOKIE, {'cookie': cookie_dict})

    # Timeouts
    def implicitly_wait(self, time_to_wait):
        """
        Sets a sticky timeout to implicitly wait for an element to be found,
           or a command to complete. This method only needs to be called one
           time per session. To set the timeout for calls to
           execute_async_script, see set_script_timeout.

        :Args:
         - time_to_wait: Amount of time to wait (in seconds)

        :Usage:
            ::

                driver.implicitly_wait(30)
        """
        if self.w3c:
            self.execute(Command.SET_TIMEOUTS, {
                'implicit': int(float(time_to_wait) * 1000)})
        else:
            self.execute(Command.IMPLICIT_WAIT, {
                'ms': float(time_to_wait) * 1000})

    def set_script_timeout(self, time_to_wait):
        """
        Set the amount of time that the script should wait during an
           execute_async_script call before throwing an error.

        :Args:
         - time_to_wait: The amount of time to wait (in seconds)

        :Usage:
            ::

                driver.set_script_timeout(30)
        """
        if self.w3c:
            self.execute(Command.SET_TIMEOUTS, {
                'script': int(float(time_to_wait) * 1000)})
        else:
            self.execute(Command.SET_SCRIPT_TIMEOUT, {
                'ms': float(time_to_wait) * 1000})

    def set_page_load_timeout(self, time_to_wait):
        """
        Set the amount of time to wait for a page load to complete
           before throwing an error.

        :Args:
         - time_to_wait: The amount of time to wait

        :Usage:
            ::

                driver.set_page_load_timeout(30)
        """
        try:
            self.execute(Command.SET_TIMEOUTS, {
                'pageLoad': int(float(time_to_wait) * 1000)})
        except WebDriverException:
            self.execute(Command.SET_TIMEOUTS, {
                'ms': float(time_to_wait) * 1000,
                'type': 'page load'})

    @property
    def timeouts(self):
        """
        Get all the timeouts that have been set on the current session

        :Usage:
            ::
                driver.timeouts
        :rtype: Timeout
        """
        timeouts = self.execute(Command.GET_TIMEOUTS)['value']
        timeouts["implicit_wait"] = timeouts.pop("implicit") / 1000
        timeouts["page_load"] = timeouts.pop("pageLoad") / 1000
        timeouts["script"] = timeouts.pop("script") / 1000
        return Timeouts(**timeouts)

    @timeouts.setter
    def timeouts(self, timeouts):
        """
        Set all timeouts for the session. This will override any previously
        set timeouts.

        :Usage:
            ::
                my_timeouts = Timeouts()
                my_timeouts.implicit_wait = 10
                driver.timeouts = my_timeouts
        """
        self.execute(Command.SET_TIMEOUTS, timeouts._to_json())['value']

    def find_element(self, by=By.ID, value=None):
        """
        Find an element given a By strategy and locator.

        :Usage:
            ::

                element = driver.find_element(By.ID, 'foo')

        :rtype: WebElement
        """
        if self.w3c:
            if by == By.ID:
                by = By.CSS_SELECTOR
                value = '[id="%s"]' % value
            elif by == By.TAG_NAME:
                by = By.CSS_SELECTOR
            elif by == By.CLASS_NAME:
                by = By.CSS_SELECTOR
                value = ".%s" % value
            elif by == By.NAME:
                by = By.CSS_SELECTOR
                value = '[name="%s"]' % value
        return self.execute(Command.FIND_ELEMENT, {
            'using': by,
            'value': value})['value']

    def find_elements(self, by=By.ID, value=None):
        """
        Find elements given a By strategy and locator.

        :Usage:
            ::

                elements = driver.find_elements(By.CLASS_NAME, 'foo')

        :rtype: list of WebElement
        """
        if isinstance(by, RelativeBy):
            _pkg = '.'.join(__name__.split('.')[:-1])
            raw_function = pkgutil.get_data(_pkg, 'findElements.js').decode('utf8')
            find_element_js = "return ({}).apply(null, arguments);".format(raw_function)
            return self.execute_script(find_element_js, by.to_dict())

        if self.w3c:
            if by == By.ID:
                by = By.CSS_SELECTOR
                value = '[id="%s"]' % value
            elif by == By.TAG_NAME:
                by = By.CSS_SELECTOR
            elif by == By.CLASS_NAME:
                by = By.CSS_SELECTOR
                value = ".%s" % value
            elif by == By.NAME:
                by = By.CSS_SELECTOR
                value = '[name="%s"]' % value

        # Return empty list if driver returns null
        # See https://github.com/SeleniumHQ/selenium/issues/4555
        return self.execute(Command.FIND_ELEMENTS, {
            'using': by,
            'value': value})['value'] or []

    @property
    def desired_capabilities(self):
        """
        returns the drivers current desired capabilities being used
        """
        warnings.warn("desired_capabilities is deprecated. Please call capabilities.",
                      DeprecationWarning, stacklevel=2)
        return self.caps

    @property
    def capabilities(self):
        """
        returns the drivers current capabilities being used.
        """
        return self.caps

    def get_screenshot_as_file(self, filename):
        """
        Saves a screenshot of the current window to a PNG image file. Returns
           False if there is any IOError, else returns True. Use full paths in
           your filename.

        :Args:
         - filename: The full path you wish to save your screenshot to. This
           should end with a `.png` extension.

        :Usage:
            ::

                driver.get_screenshot_as_file('/Screenshots/foo.png')
        """
        if not filename.lower().endswith('.png'):
            warnings.warn("name used for saved screenshot does not match file "
                          "type. It should end with a `.png` extension", UserWarning)
        png = self.get_screenshot_as_png()
        try:
            with open(filename, 'wb') as f:
                f.write(png)
        except IOError:
            return False
        finally:
            del png
        return True

    def save_screenshot(self, filename):
        """
        Saves a screenshot of the current window to a PNG image file. Returns
           False if there is any IOError, else returns True. Use full paths in
           your filename.

        :Args:
         - filename: The full path you wish to save your screenshot to. This
           should end with a `.png` extension.

        :Usage:
            ::

                driver.save_screenshot('/Screenshots/foo.png')
        """
        return self.get_screenshot_as_file(filename)

    def get_screenshot_as_png(self):
        """
        Gets the screenshot of the current window as a binary data.

        :Usage:
            ::

                driver.get_screenshot_as_png()
        """
        return base64.b64decode(self.get_screenshot_as_base64().encode('ascii'))

    def get_screenshot_as_base64(self):
        """
        Gets the screenshot of the current window as a base64 encoded string
           which is useful in embedded images in HTML.

        :Usage:
            ::

                driver.get_screenshot_as_base64()
        """
        return self.execute(Command.SCREENSHOT)['value']

    def set_window_size(self, width, height, windowHandle='current'):
        """
        Sets the width and height of the current window. (window.resizeTo)

        :Args:
         - width: the width in pixels to set the window to
         - height: the height in pixels to set the window to

        :Usage:
            ::

                driver.set_window_size(800,600)
        """
        if self.w3c:
            if windowHandle != 'current':
                warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
            self.set_window_rect(width=int(width), height=int(height))
        else:
            self.execute(Command.SET_WINDOW_SIZE, {
                'width': int(width),
                'height': int(height),
                'windowHandle': windowHandle})

    def get_window_size(self, windowHandle='current'):
        """
        Gets the width and height of the current window.

        :Usage:
            ::

                driver.get_window_size()
        """
        command = Command.GET_WINDOW_SIZE
        if self.w3c:
            if windowHandle != 'current':
                warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
            size = self.get_window_rect()
        else:
            size = self.execute(command, {'windowHandle': windowHandle})

        if size.get('value', None) is not None:
            size = size['value']

        return {k: size[k] for k in ('width', 'height')}

    def set_window_position(self, x, y, windowHandle='current'):
        """
        Sets the x,y position of the current window. (window.moveTo)

        :Args:
         - x: the x-coordinate in pixels to set the window position
         - y: the y-coordinate in pixels to set the window position

        :Usage:
            ::

                driver.set_window_position(0,0)
        """
        if self.w3c:
            if windowHandle != 'current':
                warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
            return self.set_window_rect(x=int(x), y=int(y))
        else:
            self.execute(Command.SET_WINDOW_POSITION,
                         {
                             'x': int(x),
                             'y': int(y),
                             'windowHandle': windowHandle
                         })

    def get_window_position(self, windowHandle='current'):
        """
        Gets the x,y position of the current window.

        :Usage:
            ::

                driver.get_window_position()
        """
        if self.w3c:
            if windowHandle != 'current':
                warnings.warn("Only 'current' window is supported for W3C compatibile browsers.")
            position = self.get_window_rect()
        else:
            position = self.execute(Command.GET_WINDOW_POSITION,
                                    {'windowHandle': windowHandle})['value']

        return {k: position[k] for k in ('x', 'y')}

    def get_window_rect(self):
        """
        Gets the x, y coordinates of the window as well as height and width of
        the current window.

        :Usage:
            ::

                driver.get_window_rect()
        """
        return self.execute(Command.GET_WINDOW_RECT)['value']

    def set_window_rect(self, x=None, y=None, width=None, height=None):
        """
        Sets the x, y coordinates of the window as well as height and width of
        the current window. This method is only supported for W3C compatible
        browsers; other browsers should use `set_window_position` and
        `set_window_size`.

        :Usage:
            ::

                driver.set_window_rect(x=10, y=10)
                driver.set_window_rect(width=100, height=200)
                driver.set_window_rect(x=10, y=10, width=100, height=200)
        """
        if not self.w3c:
            raise UnknownMethodException("set_window_rect is only supported for W3C compatible browsers")

        if (x is None and y is None) and (height is None and width is None):
            raise InvalidArgumentException("x and y or height and width need values")

        return self.execute(Command.SET_WINDOW_RECT, {"x": x, "y": y,
                                                      "width": width,
                                                      "height": height})['value']

    @property
    def file_detector(self):
        return self._file_detector

    @file_detector.setter
    def file_detector(self, detector):
        """
        Set the file detector to be used when sending keyboard input.
        By default, this is set to a file detector that does nothing.

        see FileDetector
        see LocalFileDetector
        see UselessFileDetector

        :Args:
         - detector: The detector to use. Must not be None.
        """
        if detector is None:
            raise WebDriverException("You may not set a file detector that is null")
        if not isinstance(detector, FileDetector):
            raise WebDriverException("Detector has to be instance of FileDetector")
        self._file_detector = detector

    @property
    def orientation(self):
        """
        Gets the current orientation of the device

        :Usage:
            ::

                orientation = driver.orientation
        """
        return self.execute(Command.GET_SCREEN_ORIENTATION)['value']

    @orientation.setter
    def orientation(self, value):
        """
        Sets the current orientation of the device

        :Args:
         - value: orientation to set it to.

        :Usage:
            ::

                driver.orientation = 'landscape'
        """
        allowed_values = ['LANDSCAPE', 'PORTRAIT']
        if value.upper() in allowed_values:
            self.execute(Command.SET_SCREEN_ORIENTATION, {'orientation': value})
        else:
            raise WebDriverException("You can only set the orientation to 'LANDSCAPE' and 'PORTRAIT'")

    @property
    def application_cache(self):
        """ Returns a ApplicationCache Object to interact with the browser app cache"""
        return ApplicationCache(self)

    @property
    def log_types(self):
        """
        Gets a list of the available log types. This only works with w3c compliant browsers.

        :Usage:
            ::

                driver.log_types
        """
        return self.execute(Command.GET_AVAILABLE_LOG_TYPES)['value'] if self.w3c else []

    def get_log(self, log_type):
        """
        Gets the log for a given log type

        :Args:
         - log_type: type of log that which will be returned

        :Usage:
            ::

                driver.get_log('browser')
                driver.get_log('driver')
                driver.get_log('client')
                driver.get_log('server')
        """
        return self.execute(Command.GET_LOG, {'type': log_type})['value']

    @asynccontextmanager
    async def add_js_error_listener(self):
        """
        Listens for JS errors and when the contextmanager exits check if there were JS Errors

        :Usage:
             ::

                async with driver.add_js_error_listener() as error:
                    driver.find_element(By.ID, "throwing-mouseover").click()
                assert error is not None
                assert error.exception_details.stack_trace.call_frames[0].function_name == "onmouseover"
        """
        assert sys.version_info >= (3, 7)
        global cdp
        async with self._get_bidi_connection():
            global devtools
            session = cdp.get_session_context('page.enable')
            await session.execute(devtools.page.enable())
            session = cdp.get_session_context('runtime.enable')
            await session.execute(devtools.runtime.enable())
            js_exception = devtools.runtime.ExceptionThrown(None, None)
            async with session.wait_for(devtools.runtime.ExceptionThrown) as exception:
                yield js_exception
            js_exception.timestamp = exception.value.timestamp
            js_exception.exception_details = exception.value.exception_details

    @asynccontextmanager
    async def add_listener(self, event_type):
        '''
        Listens for certain events that are passed in.

        :Args:
         - event_type: The type of event that we want to look at.

         :Usage:
             ::

                async with driver.add_listener(Console.log) as messages:
                    driver.execute_script("console.log('I like cheese')")
                assert messages["message"] == "I love cheese"

        '''
        assert sys.version_info >= (3, 7)
        global cdp
        from selenium.webdriver.common.bidi.console import Console

        async with self._get_bidi_connection():
            global devtools
            session = cdp.get_session_context('page.enable')
            await session.execute(devtools.page.enable())
            session = cdp.get_session_context('runtime.enable')
            await session.execute(devtools.runtime.enable())
            console = {
                "message": None,
                "level": None
            }
            async with session.wait_for(devtools.runtime.ConsoleAPICalled) as messages:
                yield console

            if event_type == Console.ERROR:
                console["message"] = messages.value.args[0].value
                console["level"] = messages.value.args[0].type_
            if event_type == Console.ALL:
                console["message"] = messages.value.args[0].value
                console["level"] = messages.value.args[0].type_

    @asynccontextmanager
    async def _get_bidi_connection(self):
        global cdp
        import_cdp()
        ws_url = None
        if self.caps.get("se:options"):
            ws_url = self.caps.get("se:options").get("cdp")
        else:
            version, ws_url = self._get_cdp_details()

        if ws_url is None:
            raise WebDriverException("Unable to find url to connect to from capabilities")

        cdp.import_devtools(version)

        global devtools
        devtools = importlib.import_module("selenium.webdriver.common.devtools.v{}".format(version))
        async with cdp.open_cdp(ws_url) as conn:
            targets = await conn.execute(devtools.target.get_targets())
            target_id = targets[0].target_id
            async with conn.open_session(target_id) as session:
                yield session

    def _get_cdp_details(self):
        import json
        import urllib3

        http = urllib3.PoolManager()
        if self.caps.get("browserName") == "chrome":
            debugger_address = self.caps.get(f"{self.vendor_prefix}:{self.caps.get('browserName')}Options").get("debuggerAddress")
        else:
            debugger_address = self.caps.get("moz:debuggerAddress")
        res = http.request('GET', f"http://{debugger_address}/json/version")
        data = json.loads(res.data)

        browser_version = data.get("Browser")
        websocket_url = data.get("webSocketDebuggerUrl")

        import re
        version = re.search(r".*/(\d+)\.", browser_version).group(1)

        return version, websocket_url

Let's not use a form of hungarian notation in naming our variables