#
#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
#
#  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
#

"""
View class for Node objects.

$Id$
"""

from zope.cachedescriptors.property import Lazy
from zope.app import zapi
from zope.app.container.browser.contents import JustContents
from zope.app.dublincore.interfaces import ICMFDublinCore
from zope.proxy import removeAllProxies
from zope.security.proxy import removeSecurityProxy

from loops.interfaces import IConcept

class NodeView(object):

    def __init__(self, context, request):
        self.context = context
        self.request = request

    def render(self, text):
        if not text:
            return u''
        if text.startswith('<'):  # seems to be HTML
            return text
        source = zapi.createObject(self.context.contentType, text)
        view = zapi.getMultiAdapter((removeAllProxies(source), self.request))
        return view.render()

    @Lazy
    def modified(self):
        """ get date/time of last modification
        """
        dc = ICMFDublinCore(self.context)
        d = dc.modified or dc.created
        return d and d.strftime('%Y-%m-%d %H:%M') or ''

    def content(self, item=None):
        if item is None:
            item = self.context.getPage()
        if item is None:
            item = self.context
        result = {'title': item.title,
                  'url': zapi.absoluteURL(item, self.request),
                  'body': self.render(item.body),
                  'items': [self.content(child)
                                for child in item.getTextItems()]}
        return result

    def menu(self, item=None):
        if item is None:
            item = self.context.getMenu()
        if item is None:
            return None
        result = {'title': item.title,
                  'url': zapi.absoluteURL(item, self.request),
                  'selected': item == self.context,
                  'items': [self.menu(child)
                                for child in item.getMenuItems()]}
        return result


class OrderedContainerView(JustContents):
    """ A view providing the necessary methods for moving sub-objects
        within an ordered container.
    """

    @Lazy
    def url(self):
        return zapi.absoluteURL(self.context, self.request)

    @Lazy
    def orderable(self):
        return len(self.context) > 1

    def checkMoveAction(self):
        request = self.request
        for var in request:
            if var.startswith('move_'):
                params = []
                if 'delta' in request:
                    params.append('delta=' + request['delta'])
                if 'ids' in request:
                    for id in request['ids']:
                        params.append('ids:list=' + id)
                request.response.redirect('%s/%s?%s'
                                          % (self.url, var, '&'.join(params)))
                return True
        return False

    def moveDown(self, ids, delta=1):
        self.context.moveSubNodesByDelta(ids, int(delta))
        self.request.response.redirect(self.url + '/contents.html')

    def moveUp(self, ids, delta=1):
        self.context.moveSubNodesByDelta(ids, -int(delta))
        self.request.response.redirect(self.url + '/contents.html')

    def moveToBottom(self, ids):
        self.context.moveSubNodesByDelta(ids, len(self.context))
        self.request.response.redirect(self.url + '/contents.html')

    def moveToTop(self, ids):
        self.context.moveSubNodesByDelta(ids, -len(self.context))
        self.request.response.redirect(self.url + '/contents.html')