# Licensed to the Apache Software Foundation (ASF) under one
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# 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
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"""
Qpid related classes.
"""

from qpid.util import connect
from qpid.connection import Connection
from qpid.datatypes import uuid4
from qpid.queue import Empty


class QPIDConnectionManager(object):
    """
    QPID Connection manager.
    """

    def __init__(self, host, port, user,
                 password, uuid=uuid4(), auto_connect=False):
        """
        Constructor.

        :host is the hostname to connect to.
        :port is the port to connect to.
        :user is the username to authenticate with.
        :password is the password to authenticate with.
        :uuid is the uuid4 to use.
        :auto_connect lets you skip using the connect method yourself.
        """
        # Set up variables
        self.host = host
        self.port = int(port)
        self.user = user
        self.password = password
        self.uuid = str(uuid)

        # Defaults for internal variables
        self._socket = None
        self._connection = None
        self._session = None

        # Honor autoconnect
        if auto_connect:
            self.connect()

    def __str__(self):
        """
        String representation of the object.
        """
        return '<QPID "%s@%s:%s">' % (self.user, self.host, self.port)

    def _is_closed(self):
        """
        Internal check to see if the connection is closed.
        """
        if self._session == None:
            return True
        return False

    def __del__(self):
        """
        Clean up after your own mess, boy!
        """
        if not self.closed:
            self.disconnect()

    def connect(self):
        """
        Connects based on the information inside the object.
        """
        self._socket = connect(self.host, self.port)
        self._connection = Connection(sock=self._socket)
        self._connection.start()
        self._session = self._connection.session(self.uuid)

    def disconnect(self, timeout=10):
        """
        Cleanly disconnect from the server.

        :timeout is the amount of seconds to wait for disconnection.
        """
        self._session.close(timeout=timeout)
        self._connection.close()
        self._socket.close()
        self._session = None

    # All properties
    session = property(lambda self: self._session)
    closed = property(lambda self: self._is_closed())