# -*- coding: utf-8 -*-
#
# This file is part of Linux Show Player
#
# Copyright 2012-2016 Francesco Ceruti <ceppofrancy@gmail.com>
#
# Linux Show Player 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.
#
# Linux Show Player 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 Linux Show Player.  If not, see <http://www.gnu.org/licenses/>.

import logging
import socket
from http.client import HTTPConnection
from xmlrpc.client import ServerProxy, Fault, Transport
from xmlrpc.server import SimpleXMLRPCServer

from lisp.core.decorators import async_function
from lisp.core.singleton import Singleton
from lisp.modules.remote.discovery import Announcer
from lisp.modules.remote.dispatcher import RemoteDispatcher


class TimeoutTransport(Transport):
    timeout = 2.0

    def set_timeout(self, timeout):
        self.timeout = timeout

    def make_connection(self, host):
        return HTTPConnection(host, timeout=self.timeout)


class RemoteController(metaclass=Singleton):
    """
        Provide control over a SimpleXMLRPCServer.
    """

    def __init__(self, ip='localhost', port=8070):
        try:
            self.server = SimpleXMLRPCServer((ip, port), allow_none=True,
                                             logRequests=False)
            self._announcer = Announcer()
        except OSError as error:
            # If address already in use
            if error.errno == 98:
                raise Exception(
                    "Only one application instance can use this module")
            else:
                raise error

        self.server.register_introspection_functions()
        self.server.register_instance(RemoteDispatcher())

    @async_function
    def start(self):
        logging.info('REMOTE: Session started at ' +
                     str(self.server.server_address))

        self._announcer.start()
        self.server.serve_forever()  # Blocking
        self._announcer.stop()

        logging.info('REMOTE: Session ended')

    def stop(self):
        self.server.shutdown()

    @staticmethod
    def connect_to(uri):
        proxy = ServerProxy(uri, transport=TimeoutTransport())

        try:
            # Call a fictive method.
            proxy._()
        except Fault:
            # Connected, the method doesn't exist, which is expected.
            pass
        except socket.error:
            # Not connected, socket error mean that the service is unreachable.
            raise OSError('Session at ' + uri + ' is unreachable')

        # Just in case the method is registered in the XmlRPC server
        return proxy
