# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Class to control the BuffaloAP router."""

import logging
import time
import urlparse

import dynamic_ap_configurator
import ap_spec
from selenium.common.exceptions import TimeoutException as \
    SeleniumTimeoutException


class BuffaloAPConfigurator(
        dynamic_ap_configurator.DynamicAPConfigurator):
    """Configurator for Buffalo AP."""


    def __init__(self, ap_config):
        super(BuffaloAPConfigurator, self).__init__(ap_config)
        self._dhcp_delay = 30


    def get_number_of_pages(self):
        return 2


    def is_update_interval_supported(self):
        """
        Returns True if setting the PSK refresh interval is supported.

        @return True is supported; False otherwise
        """
        return True


    def get_supported_modes(self):
        return [{'band':ap_spec.BAND_2GHZ,
                 'modes':[ap_spec.MODE_B, ap_spec.MODE_G, ap_spec.MODE_N,
                          ap_spec.MODE_B | ap_spec.MODE_G,
                          ap_spec.MODE_N | ap_spec.MODE_G]}]


    def get_supported_bands(self):
        return [{'band':ap_spec.BAND_2GHZ,
                 'channels':[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]}]


    def is_security_mode_supported(self, security_mode):
        """
        Returns if a given security_type is supported.

        @param security_mode: one security modes defined in the APSpec

        @return True if the security mode is supported; False otherwise.

        """
        return security_mode in (ap_spec.SECURITY_TYPE_DISABLED,
                                 ap_spec.SECURITY_TYPE_WPAPSK,
                                 ap_spec.SECURITY_TYPE_WPA2PSK,
                                 ap_spec.SECURITY_TYPE_WEP)


    def navigate_to_page(self, page_number):
        """
        Navigates to the page corresponding to the given page number.

        This method performs the translation between a page number and a url to
        load. This is used internally by apply_settings.

        @param page_number: page number of the page to load

        """
        if page_number == 1:
           page_url = urlparse.urljoin(self.admin_interface_url,
                                       'Wireless_Basic.asp')
           self.get_url(page_url, page_title='DD-WRT')
        elif page_number == 2:
           page_url = urlparse.urljoin(self.admin_interface_url,
                                       'WL_WPATable.asp')
           self.get_url(page_url, page_title='DD-WRT')
        else:
           raise RuntimeError('Invalid page number passed. Number of pages '
                              '%d, page value sent was %d' %
                              (self.get_number_of_pages(), page_number))


    def save_page(self, page_number):
        """
        Saves the given page.

        @param page_number: Page number of the page to save.

        """
        apply_set = '//input[@name="apply_button"]'
        try:
            self.wait_for_object_by_xpath(apply_set, wait_time=30)
        except SeleniumTimeoutException as e:
            self.driver.refresh()
            self.wait_for_object_by_xpath(apply_set, wait_time=30)
        self.click_button_by_xpath(apply_set)
        timeout = 0
        while self.object_by_xpath_exist("ddwrt_message") and timeout < 60:
            time.sleep(1)
            timeout = timeout + 1
        self._retry_page(page_number)


    def _retry_page(self, page_number):
        """Sometimes the interface goes down, retry."""
        for i in range(3):
            if self.driver.title.find('DD-WRT') == -1:
                self.navigate_to_page(page_number)
            else:
                return

    def _wait_for_item_in_popup(self, item, popup):
        """Wait for the popup to be enumerated."""
        for i in range(3):
            self.wait_for_object_by_xpath(popup)
            if self.item_in_popup_by_xpath_exist(item, popup):
                break
            else:
                time.sleep(1)


    def set_mode(self, mode, band=None):
        self.add_item_to_command_list(self._set_mode, (mode,), 1, 900)


    def _set_mode(self, mode):
        # Bands are not supported, so ignore.
        # Create the mode to popup item mapping.
        mode_mapping = {ap_spec.MODE_B:'B-Only', ap_spec.MODE_G: 'G-Only',
                        ap_spec.MODE_N:'N-Only (2.4 GHz)',
                        ap_spec.MODE_M:'Mixed',
                        ap_spec.MODE_B | ap_spec.MODE_G:'BG-Mixed',
                        ap_spec.MODE_N | ap_spec.MODE_G:'NG-Mixed'}
        mode_name = ''
        if mode in mode_mapping:
            mode_name = mode_mapping[mode]
        else:
            raise RuntimeError('The mode %d not supported by router %s. ',
                               hex(mode), self.name)
        xpath = '//select[@name="ath0_net_mode"]'
        try:
            self.select_item_from_popup_by_xpath(mode_name, xpath)
        except SeleniumTimeoutException, e:
            self.driver.refresh()
            self.select_item_from_popup_by_xpath(mode_name, xpath)


    def set_radio(self, enabled):
        #  We cannot turn off radio on Buffalo.
        logging.debug('This router (%s) does not support radio.', self.name)
        return None


    def set_ssid(self, ssid):
        self.add_item_to_command_list(self._set_ssid, (ssid,), 1, 900)


    def _set_ssid(self, ssid):
        xpath = '//input[@maxlength="32" and @name="ath0_ssid"]'
        self.set_content_of_text_field_by_xpath(ssid, xpath)
        self._ssid = ssid


    def set_channel(self, channel):
        self.add_item_to_command_list(self._set_channel, (channel,), 1, 900)


    def _set_channel(self, channel):
        position = self._get_channel_popup_position(channel)
        channel_choices = ['1 - 2412 MHz', '2 - 2417 MHz', '3 - 2422 MHz',
                           '4 - 2427 MHz', '5 - 2432 MHz', '6 - 2437 MHz',
                           '7 - 2442 MHz', '8 - 2447 MHz', '9 - 2452 MHz',
                           '10 - 2457 MHz', '11 - 2462 MHz']
        xpath = '//select[@name="ath0_channel"]'
        if self.number_of_items_in_popup_by_xpath(xpath) == 0:
            # If the popup is empty, refresh.
            self.driver.refresh()
        self.select_item_from_popup_by_xpath(channel_choices[position], xpath)


    def set_ch_width(self, channel_width):
        """
        Adjusts the channel channel width.

        @param channel_width: the channel width
        """
        self.add_item_to_command_list(self._set_ch_width,(channel_width,), 1,
                                      900)


    def _set_ch_width(self, channel_width):
        channel_width_choice=['Full (20 MHz)', 'Half (10 MHz)',
                              'Quarter (5 MHz)']
        xpath = '//select[@name="ath0_channelbw"]'
        self.select_item_from_popup_by_xpath(
            channel_width_choice[channel_width], xpath)


    def set_wireless_mode(self, wireless_mo):
        """
        Queues a change to the wireless mode.

        @param wireless_mo: the wireless mode.
        """
        self.add_item_to_command_list(self._set_wireless_mode,
                                      (wireless_mo,), 1, 900)


    def _set_wireless_mode(self, wireless_mo):
        """
        Sets the wireless mode.

        @param wireless_mo: the wireless mode.
        """
        wireless_mode_choices = ['AP', 'Client', 'Client Bridge',
                                 'Adhoc', 'WDS Station', 'WDS AP']
        xpath = '//select[@name="ath0_mode"]'
        self.select_item_from_popup_by_xpath(wireless_mode_choices[wireless_mo],
                                             xpath)


    def set_band(self, band):
        logging.debug('This router (%s) does not support multiple bands.',
                      self.name)
        return None


    def set_security_disabled(self):
        self.add_item_to_command_list(self._set_security_disabled, (), 2, 1000)


    def _set_security_disabled(self):
        self._retry_page(2)

        popup = '//select[@name="ath0_security_mode"]'
        disabled_item = 'Disabled'

        self._wait_for_item_in_popup(disabled_item, popup)

        self.select_item_from_popup_by_xpath(disabled_item, popup)

        for i in range(3):
            if (self.object_by_xpath_exist('//input[@name="ath0_passphrase"]')
                or self.object_by_xpath_exist('//input[@name="ath0_wpa_psk"]')):
                time.sleep(1)
            else:
                break


    def set_security_wep(self, key_value, authentication):
        self.add_item_to_command_list(self._set_security_wep,
                                      (key_value, authentication), 2, 1000)


    def _set_security_wep(self, key_value, authentication):
        # Buffalo supports WEP with wireless network mode N.
        # No exception is thrown for N-mode with WEP security.
        self._retry_page(2)

        popup = '//select[@name="ath0_security_mode"]'
        text_field = '//input[@name="ath0_passphrase"]'
        wep_item = 'WEP'

        self._wait_for_item_in_popup(wep_item, popup)

        self.select_item_from_popup_by_xpath('WEP', popup,
                                             wait_for_xpath=text_field)
        self.wait_for_object_by_xpath(text_field)
        self.set_content_of_text_field_by_xpath(key_value, text_field,
                                                abort_check=True)
        self.click_button_by_xpath('//input[@value="Generate"]')


    def set_security_wpapsk(self, security, shared_key, update_interval=3600):
        self.add_item_to_command_list(self._set_security_wpapsk,
                                      (security, shared_key, update_interval),
                                       2, 900)


    def _set_security_wpapsk(self, security, shared_key, update_interval=3600):
        self._retry_page(2)
        popup = '//select[@name="ath0_security_mode"]'
        key_field = '//input[@name="ath0_wpa_psk"]'
        interval_field = '//input[@name="ath0_wpa_gtk_rekey"]'
        if security == ap_spec.SECURITY_TYPE_WPAPSK:
             wpa_item = 'WPA Personal'
        else:
             wpa_item = 'WPA2 Personal'
        self._wait_for_item_in_popup(wpa_item, popup)
        self.select_item_from_popup_by_xpath(wpa_item, popup)
        self.wait_for_object_by_xpath(key_field, wait_time=30)
        self.set_content_of_text_field_by_xpath(shared_key, key_field)
        self.wait_for_object_by_xpath(interval_field)
        self.set_content_of_text_field_by_xpath(str(update_interval),
                                                interval_field)


    def set_visibility(self, visible=True):
        self.add_item_to_command_list(self._set_visibility, (visible,), 1, 900)


    def _set_visibility(self, visible=True):
        int_value = 0 if visible else 1
        xpath = '//input[@value="%d" and @name="ath0_closed"]' % int_value
        self.click_button_by_xpath(xpath)