# Copyright 2008-2013 Software freedom conservancy
#
# Licensed 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.


"""WebElement implementation."""
import os
import zipfile
from StringIO import StringIO
import base64


from command import Command
from selenium.common.exceptions import WebDriverException 
from selenium.common.exceptions import InvalidSelectorException
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys


class WebElement(object):
    """Represents an HTML element.

    Generally, all interesting operations to do with interacting with a page
    will be performed through this interface."""
    def __init__(self, parent, id_):
        self._parent = parent
        self._id = id_

    @property
    def tag_name(self):
        """Gets this element's tagName property."""
        return self._execute(Command.GET_ELEMENT_TAG_NAME)['value']

    @property
    def text(self):
        """Gets the text of the element."""
        return self._execute(Command.GET_ELEMENT_TEXT)['value']

    def click(self):
        """Clicks the element."""
        self._execute(Command.CLICK_ELEMENT)

    def submit(self):
        """Submits a form."""
        self._execute(Command.SUBMIT_ELEMENT)

    def clear(self):
        """Clears the text if it's a text entry element."""
        self._execute(Command.CLEAR_ELEMENT)

    def get_attribute(self, name):
        """Gets the attribute value."""
        resp = self._execute(Command.GET_ELEMENT_ATTRIBUTE, {'name': name})
        attributeValue = ''
        if resp['value'] is None:
            attributeValue = None
        else:
            attributeValue = unicode(resp['value'])
            if type(resp['value']) is bool:
                attributeValue = attributeValue.lower()

        return attributeValue

    def is_selected(self):
        """Whether the element is selected."""
        return self._execute(Command.IS_ELEMENT_SELECTED)['value']

    def is_enabled(self):
        """Whether the element is enabled."""
        return self._execute(Command.IS_ELEMENT_ENABLED)['value']

    def find_element_by_id(self, id_):
        """Finds element by id."""
        return self.find_element(by=By.ID, value=id_)

    def find_elements_by_id(self, id_):
        return self.find_elements(by=By.ID, value=id_)

    def find_element_by_name(self, name):
        """Find element by name."""
        return self.find_element(by=By.NAME, value=name)

    def find_elements_by_name(self, name):
        return self.find_elements(by=By.NAME, value=name)

    def find_element_by_link_text(self, link_text):
        """Finds element by link text."""
        return self.find_element(by=By.LINK_TEXT, value=link_text)

    def find_elements_by_link_text(self, link_text):
        return self.find_elements(by=By.LINK_TEXT, value=link_text)

    def find_element_by_partial_link_text(self, link_text):
        return self.find_element(by=By.PARTIAL_LINK_TEXT, value=link_text)

    def find_elements_by_partial_link_text(self, link_text):
        return self.find_elements(by=By.PARTIAL_LINK_TEXT, value=link_text)

    def find_element_by_tag_name(self, name):
        return self.find_element(by=By.TAG_NAME, value=name)

    def find_elements_by_tag_name(self, name):
        return self.find_elements(by=By.TAG_NAME, value=name)

    def find_element_by_xpath(self, xpath):
        """Finds element by xpath."""
        return self.find_element(by=By.XPATH, value=xpath)

    def find_elements_by_xpath(self, xpath):
        """Finds elements within the elements by xpath."""
        return self.find_elements(by=By.XPATH, value=xpath)

    def find_element_by_class_name(self, name):
        """Finds an element by their class name."""
        return self.find_element(by=By.CLASS_NAME, value=name)

    def find_elements_by_class_name(self, name):
        """Finds elements by their class name."""
        return self.find_elements(by=By.CLASS_NAME, value=name)

    def find_element_by_css_selector(self, css_selector):
        """Find and return an element by CSS selector."""
        return self.find_element(by=By.CSS_SELECTOR, value=css_selector)

    def find_elements_by_css_selector(self, css_selector):
        """Find and return list of multiple elements by CSS selector."""
        return self.find_elements(by=By.CSS_SELECTOR, value=css_selector)

    def send_keys(self, *value):
        """Simulates typing into the element."""
        # transfer file to another machine only if remote driver is used
        # the same behaviour as for java binding
        if self.parent._is_remote:
            local_file = LocalFileDetector.is_local_file(*value)
            if local_file is not None:
                value = self._upload(local_file)

        typing = []
        for val in value:
            if isinstance(val, Keys):
                typing.append(val)
            elif isinstance(val, int):
                val = str(val)
                for i in range(len(val)):
                    typing.append(val[i])
            else:
                for i in range(len(val)):
                    typing.append(val[i])
        self._execute(Command.SEND_KEYS_TO_ELEMENT, {'value': typing})

    # RenderedWebElement Items
    def is_displayed(self):
        """Whether the element would be visible to a user"""
        return self._execute(Command.IS_ELEMENT_DISPLAYED)['value']

    @property
    def location_once_scrolled_into_view(self):
        """CONSIDERED LIABLE TO CHANGE WITHOUT WARNING. Use this to discover where on the screen an
        element is so that we can click it. This method should cause the element to be scrolled
        into view.

        Returns the top lefthand corner location on the screen, or None if the element is not visible"""
        return self._execute(Command.GET_ELEMENT_LOCATION_ONCE_SCROLLED_INTO_VIEW)['value']

    @property
    def size(self):
        """ Returns the size of the element """
        size = self._execute(Command.GET_ELEMENT_SIZE)['value']
        new_size = {}
        new_size["height"] = size["height"]
        new_size["width"] = size["width"]
        return new_size

    def value_of_css_property(self, property_name):
        """ Returns the value of a CSS property """
        return self._execute(Command.GET_ELEMENT_VALUE_OF_CSS_PROPERTY,
                        {'propertyName': property_name})['value']

    @property
    def location(self):
        """ Returns the location of the element in the renderable canvas"""
        old_loc = self._execute(Command.GET_ELEMENT_LOCATION)['value']
        new_loc = {"x": old_loc['x'],
                   "y": old_loc['y']}
        return new_loc

    @property
    def parent(self):
        return self._parent

    @property
    def id(self):
        return self._id

    def __eq__(self, element):
        return self._id == element.id

    # Private Methods
    def _execute(self, command, params=None):
        """Executes a command against the underlying HTML element.

        Args:
          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 not params:
            params = {}
        params['id'] = self._id
        return self._parent.execute(command, params)

    def find_element(self, by=By.ID, value=None):
        if isinstance(by, tuple) or isinstance(value, int) or value==None:
            raise InvalidSelectorException("Invalid locator values passed in")
        
        return self._execute(Command.FIND_CHILD_ELEMENT,
                             {"using": by, "value": value})['value']

    def find_elements(self, by=By.ID, value=None):
        if isinstance(by, tuple) or isinstance(value, int) or value==None:
            raise InvalidSelectorException("Invalid locator values passed in")
        
        return self._execute(Command.FIND_CHILD_ELEMENTS,
                             {"using": by, "value": value})['value']

    def _upload(self, filename):
        fp = StringIO()
        zipped = zipfile.ZipFile(fp, 'w', zipfile.ZIP_DEFLATED)
        zipped.write(filename, os.path.split(filename)[1])
        zipped.close()
        try:
            return self._execute(Command.UPLOAD_FILE, 
                            {'file': base64.encodestring(fp.getvalue())})['value']
        except WebDriverException as e:
            if "Unrecognized command: POST" in e.__str__():
                return filename
            elif "Command not found: POST " in e.__str__():
                return filename
            elif '{"status":405,"value":["GET","HEAD","DELETE"]}' in e.__str__():
                return filename
            else:
                raise e

class LocalFileDetector(object):

    @classmethod
    def is_local_file(cls, *keys):
        file_path = ''
        typing = []
        for val in keys:
            if isinstance(val, Keys):
                typing.append(val)
            elif isinstance(val, int):
                val = str(val)
                for i in range(len(val)):
                    typing.append(val[i])
            else:
                for i in range(len(val)):
                    typing.append(val[i])
        file_path = ''.join(typing)

        if file_path is '':
            return None

        try:
          if os.path.exists(file_path):
              return file_path
        except:
          pass
        return None

