##############################################################################
#
# Copyright (c) 2004, 2005 Zope Corporation and Contributors.
# 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.
#
##############################################################################
"""Browser directives

Directives to emulate the 'http://namespaces.zope.org/browser'
namespace in ZCML known from zope.app.

$Id: metaconfigure.py 18911 2005-10-25 09:36:24Z regebro $
"""
import os

from zope.interface import Interface
from zope.component import getGlobalService, ComponentLookupError
from zope.configuration.exceptions import ConfigurationError
from zope.component.servicenames import Presentation
from zope.publisher.interfaces.browser import IBrowserRequest
from zope.app.publisher.browser.viewmeta import pages as zope_app_pages
from zope.app.publisher.browser.viewmeta import view as zope_app_view
from zope.app.publisher.browser.viewmeta import providesCallable
from zope.app.publisher.browser.globalbrowsermenuservice import\
     menuItemDirective
from zope.app.component.metaconfigure import handler
from zope.app.component.interface import provideInterface
from zope.app.container.interfaces import IAdding

from Products.Five.browser import BrowserView
from Products.Five.browser.resource import FileResourceFactory, ImageResourceFactory
from Products.Five.browser.resource import PageTemplateResourceFactory
from Products.Five.browser.resource import DirectoryResourceFactory
from Products.Five.browser.pagetemplatefile import ZopeTwoPageTemplateFile
from Products.Five.metaclass import makeClass
from Products.Five.security import getSecurityInfo, protectClass, \
    protectName, initializeClass

import ExtensionClass

def page(_context, name, permission, for_,
         layer='default', template=None, class_=None,
         allowed_interface=None, allowed_attributes=None,
         attribute='__call__', menu=None, title=None,
         ):

    _handle_menu(_context, menu, title, [for_], name, permission)

    if not (class_ or template):
        raise ConfigurationError("Must specify a class or template")
    if allowed_attributes is None:
        allowed_attributes = []
    if allowed_interface is not None:
        for interface in allowed_interface:
            attrs = [n for n, d in interface.namesAndDescriptions(1)]
            allowed_attributes.extend(attrs)

    if attribute != '__call__':
        if template:
            raise ConfigurationError(
                "Attribute and template cannot be used together.")

        if not class_:
            raise ConfigurationError(
                "A class must be provided if attribute is used")

    if template:
        template = os.path.abspath(str(_context.path(template)))
        if not os.path.isfile(template):
            raise ConfigurationError("No such file", template)

    if class_:
        # new-style classes do not work with Five. As we want to import
        # packages from z3 directly, we ignore new-style classes for now.
        if type(class_) == type:
            return
        if attribute != '__call__':
            if not hasattr(class_, attribute):
                raise ConfigurationError(
                    "The provided class doesn't have the specified attribute "
                    )
        cdict = getSecurityInfo(class_)
        if template:
            new_class = makeClassForTemplate(template, bases=(class_, ),
                                             cdict=cdict)
        elif attribute != "__call__":
            # we're supposed to make a page for an attribute (read:
            # method) and it's not __call__.  We thus need to create a
            # new class using our mixin for attributes.
            cdict.update({'__page_attribute__': attribute})
            new_class = makeClass(class_.__name__,
                                  (class_, ViewMixinForAttributes),
                                  cdict)

            # in case the attribute does not provide a docstring,
            # ZPublisher refuses to publish it.  So, as a workaround,
            # we provide a stub docstring
            func = getattr(new_class, attribute)
            if not func.__doc__:
                # cannot test for MethodType/UnboundMethod here
                # because of ExtensionClass
                if hasattr(func, 'im_func'):
                    # you can only set a docstring on functions, not
                    # on method objects
                    func = func.im_func
                func.__doc__ = "Stub docstring to make ZPublisher work"
        else:
            # we could use the class verbatim here, but we'll execute
            # some security declarations on it so we really shouldn't
            # modify the original.  So, instead we make a new class
            # with just one base class -- the original
            new_class = makeClass(class_.__name__, (class_,), cdict)

    else:
        # template
        new_class = makeClassForTemplate(template)

    _handle_for(_context, for_)

    _context.action(
        discriminator = ('view', for_, name, IBrowserRequest, layer),
        callable = handler,
        args = (Presentation, 'provideAdapter',
                IBrowserRequest, new_class, name, [for_], Interface, layer,
                _context.info),
        )
    _context.action(
        discriminator = ('five:protectClass', new_class),
        callable = protectClass,
        args = (new_class, permission)
        )
    if allowed_attributes:
        for attr in allowed_attributes:
            _context.action(
                discriminator = ('five:protectName', new_class, attr),
                callable = protectName,
                args = (new_class, attr, permission)
                )
    _context.action(
        discriminator = ('five:initialize:class', new_class),
        callable = initializeClass,
        args = (new_class,)
        )

class pages(zope_app_pages):

    def page(self, _context, name, attribute='__call__', template=None,
             menu=None, title=None):
        return page(_context,
                    name=name,
                    attribute=attribute,
                    template=template,
                    menu=menu, title=title,
                    **(self.opts))

def defaultView(_context, name, for_=None):

    type = IBrowserRequest

    _context.action(
        discriminator = ('defaultViewName', for_, type, name),
        callable = handler,
        args = (Presentation,
                'setDefaultViewName', for_, type, name),
        )

    _handle_for(_context, for_)

# view (named view with pages)

class view(zope_app_view):

    def __call__(self):
        (_context, name, for_, permission, layer, class_,
         allowed_interface, allowed_attributes) = self.args

        required = {}

        cdict = {}
        pages = {}

        for pname, attribute, template in self.pages:
            try:
                s = getGlobalService(Presentation)
            except ComponentLookupError, err:
                pass

            if template:
                cdict[pname] = ZopeTwoPageTemplateFile(template)
                if attribute and attribute != name:
                    cdict[attribute] = cdict[pname]
            else:
                if not hasattr(class_, attribute):
                    raise ConfigurationError("Undefined attribute",
                                             attribute)

            attribute = attribute or pname
            required[pname] = permission

            pages[pname] = attribute

        # This should go away, but noone seems to remember what to do. :-(
        if hasattr(class_, 'publishTraverse'):

            def publishTraverse(self, request, name,
                                pages=pages, getattr=getattr):

                if name in pages:
                    return getattr(self, pages[name])
                view = zapi.queryView(self, name, request)
                if view is not None:
                    return view

                m = class_.publishTraverse.__get__(self)
                return m(request, name)

        else:
            def publishTraverse(self, request, name,
                                pages=pages, getattr=getattr):

                if name in pages:
                    return getattr(self, pages[name])
                view = zapi.queryView(self, name, request)
                if view is not None:
                    return view

                raise NotFoundError(self, name, request)

        cdict['publishTraverse'] = publishTraverse

        if not hasattr(class_, 'browserDefault'):
            if self.default or self.pages:
                default = self.default or self.pages[0][0]
                cdict['browserDefault'] = (
                    lambda self, request, default=default:
                    (self, (default, ))
                    )
            elif providesCallable(class_):
                cdict['browserDefault'] = (
                    lambda self, request: (self, ())
                    )

        if class_ is not None:
            bases = (class_, ViewMixinForTemplates)
        else:
            bases = (ViewMixinForTemplates)

        try:
            cname = str(name)
        except:
            cname = "GeneratedClass"
            
        newclass = makeClass(cname, bases, cdict)
        
        _handle_for(_context, for_)

        if self.provides is not None:
            _context.action(
                discriminator = None,
                callable = provideInterface,
                args = ('', self.provides)
                )

        _context.action(
            discriminator = ('view', for_, name, IBrowserRequest, layer,
                             self.provides),
            callable = handler,
            args = (Presentation, 'provideAdapter',
                    IBrowserRequest, newclass, name, [for_],  self.provides,
                    layer, _context.info),
            )

def _handle_for(_context, for_):
    if for_ is not None:
        _context.action(
            discriminator = None,
            callable = provideInterface,
            args = ('', for_)
            )

def _handle_menu(_context, menu, title, for_, name, permission):
    if menu or title:
        if not (menu and title):
            raise ConfigurationError(
                "If either menu or title are specified, they must "
                "both be specified.")

        if len(for_) != 1:
            raise ConfigurationError(
                "Menus can be specified only for single-view, not for "
                "multi-views.")

        return menuItemDirective(
            _context, menu, for_[0], '@@' + str(name), title,
            permission=permission)

    return []

_factory_map = {'image':{'prefix':'ImageResource',
                         'count':0,
                         'factory':ImageResourceFactory},
                'file':{'prefix':'FileResource',
                        'count':0,
                        'factory':FileResourceFactory},
                'template':{'prefix':'PageTemplateResource',
                            'count':0,
                            'factory':PageTemplateResourceFactory}
                }

def resource(_context, name, layer='default', permission='zope.Public',
             file=None, image=None, template=None):

    if ((file and image) or (file and template) or
        (image and template) or not (file or image or template)):
        raise ConfigurationError(
            "Must use exactly one of file or image or template"
            "attributes for resource directives"
            )

    res = file or image or template
    res_type = ((file and 'file') or
                 (image and 'image') or
                 (template and 'template'))
    factory_info = _factory_map.get(res_type)
    factory_info['count'] += 1
    res_factory = factory_info['factory']
    class_name = '%s%s' % (factory_info['prefix'], factory_info['count'])
    new_class = makeClass(class_name, (res_factory.resource,), {})
    factory = res_factory(name, res, resource_factory=new_class)

    _context.action(
        discriminator = ('resource', name, IBrowserRequest, layer),
        callable = handler,
        args = (Presentation, 'provideResource',
                name, IBrowserRequest, factory, layer),
        )
    _context.action(
        discriminator = ('five:protectClass', new_class),
        callable = protectClass,
        args = (new_class, permission)
        )
    _context.action(
        discriminator = ('five:initialize:class', new_class),
        callable = initializeClass,
        args = (new_class,)
        )

_rd_map = {ImageResourceFactory:{'prefix':'DirContainedImageResource',
                                 'count':0},
           FileResourceFactory:{'prefix':'DirContainedFileResource',
                                'count':0},
           PageTemplateResourceFactory:{'prefix':'DirContainedPTResource',
                                        'count':0},
           DirectoryResourceFactory:{'prefix':'DirectoryResource',
                                     'count':0}
           }

def resourceDirectory(_context, name, directory, layer='default',
                      permission='zope.Public'):

    if not os.path.isdir(directory):
        raise ConfigurationError(
            "Directory %s does not exist" % directory
            )

    resource = DirectoryResourceFactory.resource
    f_cache = {}
    resource_factories = dict(resource.resource_factories)
    resource_factories['default'] = resource.default_factory
    for ext, factory in resource_factories.items():
        if f_cache.get(factory) is not None:
            continue
        factory_info = _rd_map.get(factory)
        factory_info['count'] += 1
        class_name = '%s%s' % (factory_info['prefix'], factory_info['count'])
        factory_name = '%s%s' % (factory.__name__, factory_info['count'])
        f_resource = makeClass(class_name, (factory.resource,), {})
        f_cache[factory] = makeClass(factory_name, (factory,),
                                     {'resource':f_resource})
    for ext, factory in resource_factories.items():
        resource_factories[ext] = f_cache[factory]
    default_factory = resource_factories['default']
    del resource_factories['default']

    cdict = {'resource_factories':resource_factories,
             'default_factory':default_factory}

    factory_info = _rd_map.get(DirectoryResourceFactory)
    factory_info['count'] += 1
    class_name = '%s%s' % (factory_info['prefix'], factory_info['count'])
    dir_factory = makeClass(class_name, (resource,), cdict)
    factory = DirectoryResourceFactory(name, directory,
                                       resource_factory=dir_factory)

    new_classes = [dir_factory,
                   ] + [f.resource for f in f_cache.values()]

    _context.action(
        discriminator = ('resource', name, IBrowserRequest, layer),
        callable = handler,
        args = (Presentation, 'provideResource',
                name, IBrowserRequest, factory, layer),
        )
    for new_class in new_classes:
        _context.action(
            discriminator = ('five:protectClass', new_class),
            callable = protectClass,
            args = (new_class, permission)
            )
        _context.action(
            discriminator = ('five:initialize:class', new_class),
            callable = initializeClass,
            args = (new_class,)
            )

#
# mixin classes / class factories
#

class ViewMixinForAttributes(BrowserView):

    # we have an attribute that we can simply tell ZPublisher to go to
    def __browser_default__(self, request):
        return self, (self.__page_attribute__,)

    # this is technically not needed because ZPublisher finds our
    # attribute through __browser_default__; but we also want to be
    # able to call pages from python modules, PythonScripts or ZPT
    def __call__(self, *args, **kw):
        attr = self.__page_attribute__
        meth = getattr(self, attr)
        return meth(*args, **kw)

class ViewMixinForTemplates(BrowserView):

    # short cut to get to macros more easily
    def __getitem__(self, name):
        if name == 'macros':
            return self.index.macros
        return self.index.macros[name]

    # make the template publishable
    def __call__(self, *args, **kw):
        return self.index(self, *args, **kw)

def makeClassForTemplate(filename, globals=None, used_for=None,
                         bases=(), cdict=None):
    # XXX needs to deal with security from the bases?
    if cdict is None:
        cdict = {}
    cdict.update({'index': ZopeTwoPageTemplateFile(filename, globals)})
    bases += (ViewMixinForTemplates,)
    class_ = makeClass("SimpleViewClass from %s" % filename, bases, cdict)

    if used_for is not None:
        class_.__used_for__ = used_for

    return class_

