# coding=utf-8

# Author: Nico Berlee http://nico.berlee.nl/
# URL: https://sickrage.github.io
#
# This file is part of SickRage.
#
# SickRage is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# SickRage is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with SickRage. If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function, unicode_literals

import re
import telnetlib

from six.moves import urllib

import sickbeard
from sickbeard import logger
from sickrage.helper.exceptions import ex

try:
    import xml.etree.cElementTree as etree
except ImportError:
    import xml.etree.ElementTree as etree


class Notifier(object):
    def notify_settings(self, host):
        """
        Retrieves the settings from a NMJ/Popcorn hour

        host: The hostname/IP of the Popcorn Hour server

        Returns: True if the settings were retrieved successfully, False otherwise
        """

        # establish a terminal session to the PC
        try:
            terminal = telnetlib.Telnet(host)
        except Exception:
            logger.log("Warning: unable to get a telnet session to {0}".format(host), logger.WARNING)
            return False

        # tell the terminal to output the necessary info to the screen so we can search it later
        logger.log("Connected to {0} via telnet".format(host), logger.DEBUG)
        terminal.read_until("sh-3.00# ")
        terminal.write("cat /tmp/source\n")
        terminal.write("cat /tmp/netshare\n")
        terminal.write("exit\n")
        tnoutput = terminal.read_all()

        match = re.search(r"(.+\.db)\r\n?(.+)(?=sh-3.00# cat /tmp/netshare)", tnoutput)

        # if we found the database in the terminal output then save that database to the config
        if match:
            database = match.group(1)
            device = match.group(2)
            logger.log("Found NMJ database {0} on device {1}".format(database, device), logger.DEBUG)
            sickbeard.NMJ_DATABASE = database
        else:
            logger.log("Could not get current NMJ database on {0}, NMJ is probably not running!".format(host), logger.WARNING)
            return False

        # if the device is a remote host then try to parse the mounting URL and save it to the config
        if device.startswith("NETWORK_SHARE/"):
            match = re.search(".*(?=\r\n?{0})".format((re.escape(device[14:]))), tnoutput)

            if match:
                mount = match.group().replace("127.0.0.1", host)
                logger.log("Found mounting url on the Popcorn Hour in configuration: {0}".format(mount), logger.DEBUG)
                sickbeard.NMJ_MOUNT = mount
            else:
                logger.log("Detected a network share on the Popcorn Hour, but could not get the mounting url",
                           logger.WARNING)
                return False

        return True

    def notify_snatch(self, ep_name):
        return False
        # Not implemented: Start the scanner when snatched does not make any sense

    def notify_download(self, ep_name):
        if sickbeard.USE_NMJ:
            self._notifyNMJ()

    def notify_subtitle_download(self, ep_name, lang):
        if sickbeard.USE_NMJ:
            self._notifyNMJ()

    def notify_git_update(self, new_version):
        return False
        # Not implemented, no reason to start scanner.

    def notify_login(self, ipaddress=""):
        return False

    def test_notify(self, host, database, mount):
        return self._sendNMJ(host, database, mount)

    def _sendNMJ(self, host, database, mount=None):
        """
        Sends a NMJ update command to the specified machine

        host: The hostname/IP to send the request to (no port)
        database: The database to send the request to
        mount: The mount URL to use (optional)

        Returns: True if the request succeeded, False otherwise
        """

        # if a mount URL is provided then attempt to open a handle to that URL
        if mount:
            try:
                req = urllib.request.Request(mount)
                logger.log("Try to mount network drive via url: {0}".format(mount), logger.DEBUG)
                handle = urllib.request.urlopen(req)
            except IOError as e:
                if hasattr(e, 'reason'):
                    logger.log("NMJ: Could not contact Popcorn Hour on host {0}: {1}".format(host, e.reason), logger.WARNING)
                elif hasattr(e, 'code'):
                    logger.log("NMJ: Problem with Popcorn Hour on host {0}: {1}".format(host, e.code), logger.WARNING)
                return False
            except Exception as e:
                logger.log("NMJ: Unknown exception: " + ex(e), logger.ERROR)
                return False

        # build up the request URL and parameters
        UPDATE_URL = "http://%(host)s:8008/metadata_database?%(params)s"
        params = {
            "arg0": "scanner_start",
            "arg1": database,
            "arg2": "background",
            "arg3": ""
        }
        params = urllib.parse.urlencode(params)
        updateUrl = UPDATE_URL % {"host": host, "params": params}

        # send the request to the server
        try:
            req = urllib.request.Request(updateUrl)
            logger.log("Sending NMJ scan update command via url: {0}".format(updateUrl), logger.DEBUG)
            handle = urllib.request.urlopen(req)
            response = handle.read()
        except IOError as e:
            if hasattr(e, 'reason'):
                logger.log("NMJ: Could not contact Popcorn Hour on host {0}: {1}".format(host, e.reason), logger.WARNING)
            elif hasattr(e, 'code'):
                logger.log("NMJ: Problem with Popcorn Hour on host {0}: {1}".format(host, e.code), logger.WARNING)
            return False
        except Exception as e:
            logger.log("NMJ: Unknown exception: " + ex(e), logger.ERROR)
            return False

        # try to parse the resulting XML
        try:
            et = etree.fromstring(response)
            result = et.findtext("returnValue")
        except SyntaxError as e:
            logger.log("Unable to parse XML returned from the Popcorn Hour: {0}".format(e), logger.ERROR)
            return False

        # if the result was a number then consider that an error
        if int(result) > 0:
            logger.log("Popcorn Hour returned an error code: {0}".format(result), logger.ERROR)
            return False
        else:
            logger.log("NMJ started background scan", logger.INFO)
            return True

    def _notifyNMJ(self, host=None, database=None, mount=None, force=False):
        """
        Sends a NMJ update command based on the SB config settings

        host: The host to send the command to (optional, defaults to the host in the config)
        database: The database to use (optional, defaults to the database in the config)
        mount: The mount URL (optional, defaults to the mount URL in the config)
        force: If True then the notification will be sent even if NMJ is disabled in the config
        """
        if not sickbeard.USE_NMJ and not force:
            logger.log("Notification for NMJ scan update not enabled, skipping this notification", logger.DEBUG)
            return False

        # fill in omitted parameters
        if not host:
            host = sickbeard.NMJ_HOST
        if not database:
            database = sickbeard.NMJ_DATABASE
        if not mount:
            mount = sickbeard.NMJ_MOUNT

        logger.log("Sending scan command for NMJ ", logger.DEBUG)

        return self._sendNMJ(host, database, mount)
