#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000-2006  Donald N. Allingham
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id$

"""
UrlBase class for GRAMPS.
"""

#-------------------------------------------------------------------------
#
# GRAMPS modules
#
#-------------------------------------------------------------------------
from gen.lib.url import Url
from gen.lib.const import IDENTICAL, EQUAL

#-------------------------------------------------------------------------
#
# UrlBase classes
#
#-------------------------------------------------------------------------
class UrlBase(object):
    """
    Base class for url-aware objects.
    """

    def __init__(self, source=None):
        """
        Initialize an UrlBase. 
        
        If the source is not None, then object is initialized from values of 
        the source object.

        :param source: Object used to initialize the new object
        :type source: UrlBase
        """
        self.urls = map(Url, source.urls) if source else []

    def serialize(self):
        """
        Convert the object to a serialized tuple of data
        """
        return [url.serialize() for url in self.urls]

    def unserialize(self, data):
        """
        Convert a serialized tuple of data to an object.
        """
        self.urls = [Url().unserialize(item) for item in data]

    def get_url_list(self):
        """
        Return the list of :class:`~gen.lib.url.Url` instances associated with the object.

        :returns: List of :class:`~gen.lib.url.Url` instances
        :rtype: list
        """
        return self.urls

    def set_url_list(self, url_list):
        """
        Set the list of :class:`~gen.lib.url.Url` instances to passed the list.

        :param url_list: List of :class:`~gen.lib.url.Url` instances
        :type url_list: list
        """
        self.urls = url_list

    def _merge_url_list(self, acquisition):
        """
        Merge the list of urls from acquisition with our own.

        :param acquisition: The url list of this object will be merged with
            the current url list.
        :rtype acquisition: UrlBase
        """
        url_list = self.urls[:]
        for addendum in acquisition.get_url_list():
            for url in url_list:
                equi = url.is_equivalent(addendum)
                if equi == IDENTICAL:
                    break
                elif equi == EQUAL:
                    url.merge(addendum)
                    break
            else:
                self.urls.append(addendum)

    def add_url(self, url):
        """
        Add a :class:`~gen.lib.url.Url` instance to the object's list of :class:`~gen.lib.url.Url` instances.

        :param url: :class:`~gen.lib.url.Url` instance to be added to the Person's list of
            related web sites.
        :type url: :class:`~gen.lib.url.Url`
        """
        self.urls.append(url)
    
    def remove_url(self, url):
        """
        Remove the specified :class:`~gen.lib.url.Url` instance from the url list.
        
        If the instance does not exist in the list, the operation has no effect.

        :param url: :class:`~gen.lib.url.Url` instance to remove from the list
        :type url: :class:`~gen.lib.url.Url`

        :returns: True if the url was removed, False if it was not in the list.
        :rtype: bool
        """
        if url in self.urls:
            self.urls.remove(url)
            return True
        else:
            return False