#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000-2007 Donald N. Allingham
# Copyright (C) 2011       Tim G L Lyons
#
# 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
#

# $Id$

"""
Basic Primary Object class for GRAMPS.
"""

#-------------------------------------------------------------------------
#
# GRAMPS modules
#
#-------------------------------------------------------------------------
from gen.lib.tableobj import TableObject
from gen.lib.privacybase import PrivacyBase
from gen.lib.citationbase import CitationBase
from gen.lib.mediabase import MediaBase

#-------------------------------------------------------------------------
#
# Basic Primary Object class
#
#-------------------------------------------------------------------------
class BasicPrimaryObject(TableObject, PrivacyBase):
    """
    The BasicPrimaryObject is the base class for Note objects.
    
    It is also the base class for the PrimaryObject class.    
    
    The PrimaryObject is the base class for all other primary objects in the
    database. Primary objects are the core objects in the database.
    Each object has a database handle and a GRAMPS ID value. The database
    handle is used as the record number for the database, and the GRAMPS
    ID is the user visible version.
    """
    
    def __init__(self, source=None):
        """
        Initialize a PrimaryObject. 
        
        If source is None, both the ID and handle are assigned as empty 
        strings. If 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: PrimaryObject
        """
        TableObject.__init__(self, source)
        PrivacyBase.__init__(self, source)
        if source:
            self.gramps_id = source.gramps_id
        else:
            self.gramps_id = None

    def set_gramps_id(self, gramps_id):
        """
        Set the GRAMPS ID for the primary object.
        
        :param gramps_id: GRAMPS ID
        :type gramps_id: str
        """
        self.gramps_id = gramps_id

    def get_gramps_id(self):
        """
        Return the GRAMPS ID for the primary object.

        :returns: GRAMPS ID associated with the object
        :rtype: str
        """
        return self.gramps_id

    def has_handle_reference(self, classname, handle):
        """
        Return True if the object has reference to a given handle of given 
        primary object type.
        
        :param classname: The name of the primary object class.
        :type classname: str
        :param handle: The handle to be checked.
        :type handle: str

        :returns: 
          Returns whether the object has reference to this handle of 
          this object type.

        :rtype: bool
        """
        return False

    def remove_handle_references(self, classname, handle_list):
        """
        Remove all references in this object to object handles in the list.

        :param classname: The name of the primary object class.
        :type classname: str
        :param handle_list: The list of handles to be removed.
        :type handle_list: str
        """
        pass

    def replace_handle_reference(self, classname, old_handle, new_handle):
        """
        Replace all references to old handle with those to the new handle.

        :param classname: The name of the primary object class.
        :type classname: str
        :param old_handle: The handle to be replaced.
        :type old_handle: str
        :param new_handle: The handle to replace the old one with.
        :type new_handle: str
        """
        pass

    def has_media_reference(self, handle):
        """
        Indicate if the object has a media references. 
        
        In the base class, no such references exist. Derived classes should 
        override this if they provide media references.
        """
        return False

    def remove_citation_references(self, handle_list):
        """
        Remove the specified source references from the object. 
        
        In the base class no such references exist. Derived classes should 
        override this if they provide source references.
        """
        pass

    def remove_media_references(self, handle_list):
        """
        Remove the specified media references from the object. 
        
        In the base class no such references exist. Derived classes should 
        override this if they provide media references.
        """
        pass

    def replace_citation_references(self, old_handle, new_handle):
        pass

    def replace_media_references(self, old_handle, new_handle):
        pass

#-------------------------------------------------------------------------
#
# Primary Object class
#
#-------------------------------------------------------------------------
class PrimaryObject(BasicPrimaryObject):
    """
    The PrimaryObject is the base class for all primary objects in the
    database. 
    
    Primary objects are the core objects in the database.
    Each object has a database handle and a GRAMPS ID value. The database
    handle is used as the record number for the database, and the GRAMPS
    ID is the user visible version.
    """
    
    def __init__(self, source=None):
        """
        Initialize a PrimaryObject. 
        
        If source is None, both the ID and handle are assigned as empty 
        strings. If 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: PrimaryObject
        """
        BasicPrimaryObject.__init__(self, source)

    def has_handle_reference(self, classname, handle):
        """
        Return True if the object has reference to a given handle of given 
        primary object type.
        
        :param classname: The name of the primary object class.
        :type classname: str
        :param handle: The handle to be checked.
        :type handle: str
        :returns: Returns whether the object has reference to this handle 
          of this object type.
        :rtype: bool
        """
        if classname == 'Citation' and isinstance(self, CitationBase):
            return self.has_citation_reference(handle)
        elif classname == 'MediaObject' and isinstance(self, MediaBase):
            return self.has_media_reference(handle)
        else:
            return self._has_handle_reference(classname, handle)

    def remove_handle_references(self, classname, handle_list):
        """
        Remove all references in this object to object handles in the list.

        :param classname: The name of the primary object class.
        :type classname: str
        :param handle_list: The list of handles to be removed.
        :type handle_list: str
        """
        if classname == 'Citation' and isinstance(self, CitationBase):
            self.remove_citation_references(handle_list)
        elif classname == 'MediaObject' and isinstance(self, MediaBase):
            self.remove_media_references(handle_list)
        else:
            self._remove_handle_references(classname, handle_list)

    def replace_handle_reference(self, classname, old_handle, new_handle):
        """
        Replace all references to old handle with those to the new handle.

        :param classname: The name of the primary object class.
        :type classname: str
        :param old_handle: The handle to be replaced.
        :type old_handle: str
        :param new_handle: The handle to replace the old one with.
        :type new_handle: str
        """
        if classname == 'Citation' and isinstance(self, CitationBase):
            self.replace_citation_references(old_handle, new_handle)
        elif classname == 'MediaObject' and isinstance(self, MediaBase):
            self.replace_media_references(old_handle, new_handle)
        else:
            self._replace_handle_reference(classname, old_handle, new_handle)

    def _has_handle_reference(self, classname, handle):
        """
        Return True if the handle is referenced by the object.
        """
        return False

    def _remove_handle_references(self, classname, handle_list):
        """
        Remove the handle references from the object.
        """
        pass

    def _replace_handle_reference(self, classname, old_handle, new_handle):
        """
        Replace the handle reference with the new reference.
        """
        pass
