#
#  Copyright (c) 2008 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
#

"""
Base implementation for accessing external content objects.

$Id$
"""

from zope.app.container.contained import Contained
from zope.cachedescriptors.property import Lazy
from zope import component
from zope.interface import implements

from cybertools.integrator.interfaces import IContainerFactory, IFileFactory
from cybertools.integrator.interfaces import IReadContainer, IFile, IImage


# proxy base (sample) classes

class ReadContainer(Contained):

    implements(IReadContainer)

    factoryName = 'sample'
    __parent__ = None

    def __init__(self, address, **kw):
        self.address = address
        for k, v in kw.items():
            setattr(self, k, v)

    @Lazy
    def fileFactory(self):
        return component.getUtility(IFileFactory, name=self.factoryName)

    @Lazy
    def containerFactory(self):
        return component.getUtility(IContainerFactory, name=self.factoryName)

    def keys(self):
        return [k for k, v in self.items()]

    def __iter__(self):
        return iter(self.keys())

    def __getitem__(self, key):
        if key in self:
            return self.get(key)
        raise KeyError(key)

    def get(self, key, default=None):
        return default

    def values(self):
        return [v for k, v in self.items()]

    def __len__(self):
        return len(self.keys())

    def items(self):
        return []

    def __contains__(self, key):
        return key in self.keys()

    has_key = __contains__


class File(object):

    implements(IFile)

    contentType = None
    data = None
    __parent__ = None

    def __init__(self, address, contentType, **kw):
        self.address = address
        self.contentType = contentType
        for k, v in kw.items():
            setattr(self, k, v)

    def getData(self, num=None):
        return ''

    data = property(getData)

    def getSize(self):
        return len(self.data)


def Image(File):

    implements(IImage)

    def getImageSize(self):
        return 0, 0


# factory base (sample) classes

class Factory(object):

    proxyClass = ReadContainer

    def __call__(self, address, **kw):
        return self.proxyClass(address, **kw)


class ContainerFactory(Factory):

    implements(IContainerFactory)

    proxyClass = ReadContainer


class FileFactory(Factory):

    implements(IFileFactory)

    proxyClass = File   # real implementations should also care about images