# 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.

import base64
import logging
import platform
import socket
import string

import certifi
import urllib3
import os

try:
    from urllib import parse
except ImportError:  # above is available in py3+, below is py2.7
    import urlparse as parse
from selenium import __version__
from .command import Command
from .errorhandler import ErrorCode
from . import utils

LOGGER = logging.getLogger(__name__)


class RemoteConnection(object):
    """A connection with the Remote WebDriver server.

    Communicates with the server using the WebDriver wire protocol:
    https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol"""

    browser_name = None
    _timeout = socket._GLOBAL_DEFAULT_TIMEOUT
    _ca_certs = certifi.where()

    @classmethod
    def get_timeout(cls):
        """
        :Returns:
            Timeout value in seconds for all http requests made to the Remote Connection
        """
        return None if cls._timeout == socket._GLOBAL_DEFAULT_TIMEOUT else cls._timeout

    @classmethod
    def set_timeout(cls, timeout):
        """
        Override the default timeout

        :Args:
            - timeout - timeout value for http requests in seconds
        """
        cls._timeout = timeout

    @classmethod
    def reset_timeout(cls):
        """
        Reset the http request timeout to socket._GLOBAL_DEFAULT_TIMEOUT
        """
        cls._timeout = socket._GLOBAL_DEFAULT_TIMEOUT

    @classmethod
    def get_certificate_bundle_path(cls):
        """
        :Returns:
            Paths of the .pem encoded certificate to verify connection to comand executor
        """
        return cls._ca_certs

    @classmethod
    def set_certificate_bundle_path(cls, path):
        """
        Set the path to the certificate bundle to verify connection to command executor.
        Can also be set to None to disable certificate validation.

        :Args:
            - path - path of a .pem encoded certificate chain.
        """
        cls._ca_certs = path

    @classmethod
    def get_remote_connection_headers(cls, parsed_url, keep_alive=False):
        """
        Get headers for remote request.

        :Args:
         - parsed_url - The parsed url
         - keep_alive (Boolean) - Is this a keep-alive connection (default: False)
        """

        system = platform.system().lower()
        if system == "darwin":
            system = "mac"

        headers = {
            'Accept': 'application/json',
            'Content-Type': 'application/json;charset=UTF-8',
            'User-Agent': 'selenium/{} (python {})'.format(__version__, system)
        }

        if parsed_url.username:
            base64string = base64.b64encode('{0.username}:{0.password}'.format(parsed_url).encode())
            headers.update({
                'Authorization': 'Basic {}'.format(base64string.decode())
            })

        if keep_alive:
            headers.update({
                'Connection': 'keep-alive'
            })

        return headers

    def _get_proxy_url(self):
        if self._url.startswith('https://'):
            return os.environ.get('https_proxy', os.environ.get('HTTPS_PROXY'))
        elif self._url.startswith('http://'):
            return os.environ.get('http_proxy', os.environ.get('HTTP_PROXY'))

    def _get_connection_manager(self):
        pool_manager_init_args = {
            'timeout': self._timeout
        }
        if self._ca_certs:
            pool_manager_init_args['cert_reqs'] = 'CERT_REQUIRED'
            pool_manager_init_args['ca_certs'] = self._ca_certs

        return urllib3.PoolManager(**pool_manager_init_args) if self._proxy_url is None else \
            urllib3.ProxyManager(self._proxy_url, **pool_manager_init_args)

    def __init__(self, remote_server_addr, keep_alive=False, resolve_ip=None, ignore_proxy=False):
        if resolve_ip is not None:
            import warnings
            warnings.warn(
                "'resolve_ip' option removed; ip addresses are now always resolved by urllib3.",
                DeprecationWarning)
        self.keep_alive = keep_alive
        self._url = remote_server_addr
        self._proxy_url = self._get_proxy_url() if not ignore_proxy else None
        if keep_alive:
            self._conn = self._get_connection_manager()

        self._commands = {
            Command.STATUS: ('GET', '/status'),
            Command.NEW_SESSION: ('POST', '/session'),
            Command.GET_ALL_SESSIONS: ('GET', '/sessions'),
            Command.QUIT: ('DELETE', '/session/$sessionId'),
            Command.GET_CURRENT_WINDOW_HANDLE:
                ('GET', '/session/$sessionId/window_handle'),
            Command.W3C_GET_CURRENT_WINDOW_HANDLE:
                ('GET', '/session/$sessionId/window'),
            Command.GET_WINDOW_HANDLES:
                ('GET', '/session/$sessionId/window_handles'),
            Command.W3C_GET_WINDOW_HANDLES:
                ('GET', '/session/$sessionId/window/handles'),
            Command.GET: ('POST', '/session/$sessionId/url'),
            Command.GO_FORWARD: ('POST', '/session/$sessionId/forward'),
            Command.GO_BACK: ('POST', '/session/$sessionId/back'),
            Command.REFRESH: ('POST', '/session/$sessionId/refresh'),
            Command.EXECUTE_SCRIPT: ('POST', '/session/$sessionId/execute'),
            Command.W3C_EXECUTE_SCRIPT:
                ('POST', '/session/$sessionId/execute/sync'),
            Command.W3C_EXECUTE_SCRIPT_ASYNC:
                ('POST', '/session/$sessionId/execute/async'),
            Command.GET_CURRENT_URL: ('GET', '/session/$sessionId/url'),
            Command.GET_TITLE: ('GET', '/session/$sessionId/title'),
            Command.GET_PAGE_SOURCE: ('GET', '/session/$sessionId/source'),
            Command.SCREENSHOT: ('GET', '/session/$sessionId/screenshot'),
            Command.ELEMENT_SCREENSHOT: ('GET', '/session/$sessionId/element/$id/screenshot'),
            Command.FIND_ELEMENT: ('POST', '/session/$sessionId/element'),
            Command.FIND_ELEMENTS: ('POST', '/session/$sessionId/elements'),
            Command.W3C_GET_ACTIVE_ELEMENT: ('GET', '/session/$sessionId/element/active'),
            Command.GET_ACTIVE_ELEMENT:
                ('POST', '/session/$sessionId/element/active'),
            Command.FIND_CHILD_ELEMENT:
                ('POST', '/session/$sessionId/element/$id/element'),
            Command.FIND_CHILD_ELEMENTS:
                ('POST', '/session/$sessionId/element/$id/elements'),
            Command.CLICK_ELEMENT: ('POST', '/session/$sessionId/element/$id/click'),
            Command.CLEAR_ELEMENT: ('POST', '/session/$sessionId/element/$id/clear'),
            Command.SUBMIT_ELEMENT: ('POST', '/session/$sessionId/element/$id/submit'),
            Command.GET_ELEMENT_TEXT: ('GET', '/session/$sessionId/element/$id/text'),
            Command.SEND_KEYS_TO_ELEMENT:
                ('POST', '/session/$sessionId/element/$id/value'),
            Command.SEND_KEYS_TO_ACTIVE_ELEMENT:
                ('POST', '/session/$sessionId/keys'),
            Command.UPLOAD_FILE: ('POST', "/session/$sessionId/se/file"),
            Command.GET_ELEMENT_VALUE:
                ('GET', '/session/$sessionId/element/$id/value'),
            Command.GET_ELEMENT_TAG_NAME:
                ('GET', '/session/$sessionId/element/$id/name'),
            Command.IS_ELEMENT_SELECTED:
                ('GET', '/session/$sessionId/element/$id/selected'),
            Command.SET_ELEMENT_SELECTED:
                ('POST', '/session/$sessionId/element/$id/selected'),
            Command.IS_ELEMENT_ENABLED:
                ('GET', '/session/$sessionId/element/$id/enabled'),
            Command.IS_ELEMENT_DISPLAYED:
                ('GET', '/session/$sessionId/element/$id/displayed'),
            Command.GET_ELEMENT_LOCATION:
                ('GET', '/session/$sessionId/element/$id/location'),
            Command.GET_ELEMENT_LOCATION_ONCE_SCROLLED_INTO_VIEW:
                ('GET', '/session/$sessionId/element/$id/location_in_view'),
            Command.GET_ELEMENT_SIZE:
                ('GET', '/session/$sessionId/element/$id/size'),
            Command.GET_ELEMENT_RECT:
                ('GET', '/session/$sessionId/element/$id/rect'),
            Command.GET_ELEMENT_ATTRIBUTE:
                ('GET', '/session/$sessionId/element/$id/attribute/$name'),
            Command.GET_ELEMENT_PROPERTY:
                ('GET', '/session/$sessionId/element/$id/property/$name'),
            Command.GET_ALL_COOKIES: ('GET', '/session/$sessionId/cookie'),
            Command.ADD_COOKIE: ('POST', '/session/$sessionId/cookie'),
            Command.GET_COOKIE: ('GET', '/session/$sessionId/cookie/$name'),
            Command.DELETE_ALL_COOKIES:
                ('DELETE', '/session/$sessionId/cookie'),
            Command.DELETE_COOKIE:
                ('DELETE', '/session/$sessionId/cookie/$name'),
            Command.SWITCH_TO_FRAME: ('POST', '/session/$sessionId/frame'),
            Command.SWITCH_TO_PARENT_FRAME: ('POST', '/session/$sessionId/frame/parent'),
            Command.SWITCH_TO_WINDOW: ('POST', '/session/$sessionId/window'),
            Command.NEW_WINDOW: ('POST', '/session/$sessionId/window/new'),
            Command.CLOSE: ('DELETE', '/session/$sessionId/window'),
            Command.GET_ELEMENT_VALUE_OF_CSS_PROPERTY:
                ('GET', '/session/$sessionId/element/$id/css/$propertyName'),
            Command.IMPLICIT_WAIT:
                ('POST', '/session/$sessionId/timeouts/implicit_wait'),
            Command.EXECUTE_ASYNC_SCRIPT: ('POST', '/session/$sessionId/execute_async'),
            Command.SET_SCRIPT_TIMEOUT:
                ('POST', '/session/$sessionId/timeouts/async_script'),
            Command.SET_TIMEOUTS:
                ('POST', '/session/$sessionId/timeouts'),
            Command.GET_TIMEOUTS:
                ('GET', '/session/$sessionId/timeouts'),
            Command.DISMISS_ALERT:
                ('POST', '/session/$sessionId/dismiss_alert'),
            Command.W3C_DISMISS_ALERT:
                ('POST', '/session/$sessionId/alert/dismiss'),
            Command.ACCEPT_ALERT:
                ('POST', '/session/$sessionId/accept_alert'),
            Command.W3C_ACCEPT_ALERT:
                ('POST', '/session/$sessionId/alert/accept'),
            Command.SET_ALERT_VALUE:
                ('POST', '/session/$sessionId/alert_text'),
            Command.W3C_SET_ALERT_VALUE:
                ('POST', '/session/$sessionId/alert/text'),
            Command.GET_ALERT_TEXT:
                ('GET', '/session/$sessionId/alert_text'),
            Command.W3C_GET_ALERT_TEXT:
                ('GET', '/session/$sessionId/alert/text'),
            Command.SET_ALERT_CREDENTIALS:
                ('POST', '/session/$sessionId/alert/credentials'),
            Command.CLICK:
                ('POST', '/session/$sessionId/click'),
            Command.W3C_ACTIONS:
                ('POST', '/session/$sessionId/actions'),
            Command.W3C_CLEAR_ACTIONS:
                ('DELETE', '/session/$sessionId/actions'),
            Command.DOUBLE_CLICK:
                ('POST', '/session/$sessionId/doubleclick'),
            Command.MOUSE_DOWN:
                ('POST', '/session/$sessionId/buttondown'),
            Command.MOUSE_UP:
                ('POST', '/session/$sessionId/buttonup'),
            Command.MOVE_TO:
                ('POST', '/session/$sessionId/moveto'),
            Command.GET_WINDOW_SIZE:
                ('GET', '/session/$sessionId/window/$windowHandle/size'),
            Command.SET_WINDOW_SIZE:
                ('POST', '/session/$sessionId/window/$windowHandle/size'),
            Command.GET_WINDOW_POSITION:
                ('GET', '/session/$sessionId/window/$windowHandle/position'),
            Command.SET_WINDOW_POSITION:
                ('POST', '/session/$sessionId/window/$windowHandle/position'),
            Command.SET_WINDOW_RECT:
                ('POST', '/session/$sessionId/window/rect'),
            Command.GET_WINDOW_RECT:
                ('GET', '/session/$sessionId/window/rect'),
            Command.MAXIMIZE_WINDOW:
                ('POST', '/session/$sessionId/window/$windowHandle/maximize'),
            Command.W3C_MAXIMIZE_WINDOW:
                ('POST', '/session/$sessionId/window/maximize'),
            Command.SET_SCREEN_ORIENTATION:
                ('POST', '/session/$sessionId/orientation'),
            Command.GET_SCREEN_ORIENTATION:
                ('GET', '/session/$sessionId/orientation'),
            Command.SINGLE_TAP:
                ('POST', '/session/$sessionId/touch/click'),
            Command.TOUCH_DOWN:
                ('POST', '/session/$sessionId/touch/down'),
            Command.TOUCH_UP:
                ('POST', '/session/$sessionId/touch/up'),
            Command.TOUCH_MOVE:
                ('POST', '/session/$sessionId/touch/move'),
            Command.TOUCH_SCROLL:
                ('POST', '/session/$sessionId/touch/scroll'),
            Command.DOUBLE_TAP:
                ('POST', '/session/$sessionId/touch/doubleclick'),
            Command.LONG_PRESS:
                ('POST', '/session/$sessionId/touch/longclick'),
            Command.FLICK:
                ('POST', '/session/$sessionId/touch/flick'),
            Command.EXECUTE_SQL:
                ('POST', '/session/$sessionId/execute_sql'),
            Command.GET_LOCATION:
                ('GET', '/session/$sessionId/location'),
            Command.SET_LOCATION:
                ('POST', '/session/$sessionId/location'),
            Command.GET_APP_CACHE:
                ('GET', '/session/$sessionId/application_cache'),
            Command.GET_APP_CACHE_STATUS:
                ('GET', '/session/$sessionId/application_cache/status'),
            Command.CLEAR_APP_CACHE:
                ('DELETE', '/session/$sessionId/application_cache/clear'),
            Command.GET_NETWORK_CONNECTION:
                ('GET', '/session/$sessionId/network_connection'),
            Command.SET_NETWORK_CONNECTION:
                ('POST', '/session/$sessionId/network_connection'),
            Command.GET_LOCAL_STORAGE_ITEM:
                ('GET', '/session/$sessionId/local_storage/key/$key'),
            Command.REMOVE_LOCAL_STORAGE_ITEM:
                ('DELETE', '/session/$sessionId/local_storage/key/$key'),
            Command.GET_LOCAL_STORAGE_KEYS:
                ('GET', '/session/$sessionId/local_storage'),
            Command.SET_LOCAL_STORAGE_ITEM:
                ('POST', '/session/$sessionId/local_storage'),
            Command.CLEAR_LOCAL_STORAGE:
                ('DELETE', '/session/$sessionId/local_storage'),
            Command.GET_LOCAL_STORAGE_SIZE:
                ('GET', '/session/$sessionId/local_storage/size'),
            Command.GET_SESSION_STORAGE_ITEM:
                ('GET', '/session/$sessionId/session_storage/key/$key'),
            Command.REMOVE_SESSION_STORAGE_ITEM:
                ('DELETE', '/session/$sessionId/session_storage/key/$key'),
            Command.GET_SESSION_STORAGE_KEYS:
                ('GET', '/session/$sessionId/session_storage'),
            Command.SET_SESSION_STORAGE_ITEM:
                ('POST', '/session/$sessionId/session_storage'),
            Command.CLEAR_SESSION_STORAGE:
                ('DELETE', '/session/$sessionId/session_storage'),
            Command.GET_SESSION_STORAGE_SIZE:
                ('GET', '/session/$sessionId/session_storage/size'),
            Command.GET_LOG:
                ('POST', '/session/$sessionId/se/log'),
            Command.GET_AVAILABLE_LOG_TYPES:
                ('GET', '/session/$sessionId/se/log/types'),
            Command.CURRENT_CONTEXT_HANDLE:
                ('GET', '/session/$sessionId/context'),
            Command.CONTEXT_HANDLES:
                ('GET', '/session/$sessionId/contexts'),
            Command.SWITCH_TO_CONTEXT:
                ('POST', '/session/$sessionId/context'),
            Command.FULLSCREEN_WINDOW:
                ('POST', '/session/$sessionId/window/fullscreen'),
            Command.MINIMIZE_WINDOW:
                ('POST', '/session/$sessionId/window/minimize')
        }

    def execute(self, command, params):
        """
        Send a command to the remote server.

        Any path substitutions required for the URL mapped to the command should be
        included in the command parameters.

        :Args:
         - command - A string specifying the command to execute.
         - params - A dictionary of named parameters to send with the command as
           its JSON payload.
        """
        command_info = self._commands[command]
        assert command_info is not None, 'Unrecognised command %s' % command
        path = string.Template(command_info[1]).substitute(params)
        if hasattr(self, 'w3c') and self.w3c and isinstance(params, dict) and 'sessionId' in params:
            del params['sessionId']
        data = utils.dump_json(params)
        url = '%s%s' % (self._url, path)
        return self._request(command_info[0], url, body=data)

    def _request(self, method, url, body=None):
        """
        Send an HTTP request to the remote server.

        :Args:
         - method - A string for the HTTP method to send the request with.
         - url - A string for the URL to send the request to.
         - body - A string for request body. Ignored unless method is POST or PUT.

        :Returns:
          A dictionary with the server's parsed JSON response.
        """
        LOGGER.debug('%s %s %s' % (method, url, body))

        parsed_url = parse.urlparse(url)
        headers = self.get_remote_connection_headers(parsed_url, self.keep_alive)
        resp = None
        if body and method != 'POST' and method != 'PUT':
            body = None

        if self.keep_alive:
            resp = self._conn.request(method, url, body=body, headers=headers)

            statuscode = resp.status
        else:
            conn = self._get_connection_manager()
            with conn as http:
                resp = http.request(method, url, body=body, headers=headers)

            statuscode = resp.status
            if not hasattr(resp, 'getheader'):
                if hasattr(resp.headers, 'getheader'):
                    resp.getheader = lambda x: resp.headers.getheader(x)
                elif hasattr(resp.headers, 'get'):
                    resp.getheader = lambda x: resp.headers.get(x)

        data = resp.data.decode('UTF-8')
        try:
            if 300 <= statuscode < 304:
                return self._request('GET', resp.getheader('location'))
            if 399 < statuscode <= 500:
                return {'status': statuscode, 'value': data}
            content_type = []
            if resp.getheader('Content-Type') is not None:
                content_type = resp.getheader('Content-Type').split(';')
            if not any([x.startswith('image/png') for x in content_type]):

                try:
                    data = utils.load_json(data.strip())
                except ValueError:
                    if 199 < statuscode < 300:
                        status = ErrorCode.SUCCESS
                    else:
                        status = ErrorCode.UNKNOWN_ERROR
                    return {'status': status, 'value': data.strip()}

                # Some of the drivers incorrectly return a response
                # with no 'value' field when they should return null.
                if 'value' not in data:
                    data['value'] = None
                return data
            else:
                data = {'status': 0, 'value': data}
                return data
        finally:
            LOGGER.debug("Finished Request")
            resp.close()

    def close(self):
        """
        Clean up resources when finished with the remote_connection
        """
        if hasattr(self, '_conn'):
            self._conn.clear()
