##############################################################################
#
# CMFDynamicViewFTI
# Copyright (c) 2005 Plone Foundation. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
# Authors:  Martin Aspeli
#           Christian Heimes
#
##############################################################################

from zope.interface import Interface

from Products.CMFCore.interfaces import ITypeInformation

class IDynamicViewTypeInformation(ITypeInformation):
    """Interface for FTI with dynamic views

    A value of (dynamic view) as alias is replaced by the output of getLayout()
    """

    def getAvailableViewMethods(context):
        """Get a list of registered view methods
        """

    def getViewMethod(context, enforce_available = True):
        """Get view method name from context

        Return -- view method from context or default view name
        """

    def getDefaultViewMethod(context):
        """Get the default view method from the FTI
        """

    def getDefaultPage(context, check_exists=False):
        """Get the default page from a folderish object

        Non folderish objects don't have a default view.

        If check_exists is enabled the method makes sure the object with the default
        page id exists.

        Return -- None for no default page or a string
        """

    def defaultView(context):
        """Get the layout for an object

        At first it tries to get the default page from the context. A default page
        must be listed on the folder or else it is ignored.

        At last it get the view method.

        Return -- a string containing the name of the layout
        """

class IBrowserDefault(Interface):
    """Content supporting different views on a per-instance basis.
    
    This can be either as a page template (a layout), or as the id of a 
    contained object (aka a default page, set inside a folderish item only).
    """

    def defaultView(request=None):
        """Get the actual view to use. 
        
        If a default page is set, its id will
        be returned. Else, the current layout's page template id is returned.
        """

    def __call__():
        """Resolve and return the selected view template applied to the object.
        
        This should not consider any default page set.
        """

    def getDefaultPage():
        """Return the id of the default page, or None if none is set. 
        
        The default page must be contained within this (folderish) item.
        """

    def getLayout(**kw):
        """Get the selected layout template. 
        
        Note that a selected default page will override the layout template.
        """

    def getDefaultLayout():
        """Get the default layout template.
        """


class ISelectableBrowserDefault(IBrowserDefault):
    """Content supporting operations to explicitly set the default layout 
    template or default page object.
    """

    def canSetDefaultPage():
        """Can a default page be set?
        
        Return True if the user has permission to select a default page on this
        (folderish) item, and the item is folderish.
        """

    def setDefaultPage(objectId):
        """Set the default page to display in this (folderish) object. 
        
        The objectId must be a value found in self.objectIds() (i.e. a contained 
        object). This object will be displayed as the default_page/index_html 
        object of this (folderish) object. This will override the current layout
        template returned by getLayout(). Pass None for objectId to turn off
        the default page and return to using the selected layout template.
        """

    def canSetLayout():
        """Return True if the current authenticated user is permitted to select
        a layout.
        """

    def setLayout(layout):
        """Set the layout as the current view. 
        
        'layout' should be one of the list returned by getAvailableLayouts(). 
        If a default page has been set with setDefaultPage(), it is turned off 
        by calling setDefaultPage(None).
        """

    def getAvailableLayouts():
        """Get the layouts registered for this object.

        This should return a list of tuples: (id, title), where id is the id
        of the page template providing the layout and title is the title of
        that page template as it will be displayed to the user.
        """
