from Acquisition import aq_inner
from Products.Five.browser import BrowserView

import logging

logger = logging.getLogger(__name__)


class GetMacros(BrowserView):
    """Get macros.

    This is the former 'get_macros' python skin script.  It was moved
    to a browser view to avoid an Unauthorized exception when using
    five.pt.  Browser views are recommended anyway.
    """

    def get_macros(self, vdata):
        context = aq_inner(self.context)
        # We need to get the view appropriate for the object in the
        # history, not the current object, which may differ due to
        # some migration.
        type_info = context.portal_types.getTypeInfo(vdata.object)

        # build the name of special versions views
        if getattr(type_info, 'getViewMethod', None) is not None:
            # Should use IBrowserDefault.getLayout ?
            def_method_name = type_info.getViewMethod(context)
        else:
            def_method_name = type_info.getActionInfo(
                'object/view')['url'].split('/')[-1] or \
                getattr(type_info, 'default_view', 'view')
        versionPreviewMethodName = 'version_%s' % def_method_name
        versionPreviewTemplate = getattr(
            context, versionPreviewMethodName, None)

        # check if a special version view exists
        if getattr(versionPreviewTemplate, 'macros', None) is None:
            # Use the Plone's default view template
            versionPreviewTemplate = context.restrictedTraverse(
                def_method_name)

        if getattr(versionPreviewTemplate, 'macros', None) is None:
            return None

        macro_names = ['content-core', 'main']

        try:
            return versionPreviewTemplate.macros['content-core']
        except KeyError:
            pass  # No content-core macro could mean that we are in plone3 land
        try:
            return versionPreviewTemplate.macros['main']
        except KeyError:
            logger.warn(
                'Missing TAL macros {0} in template "{1}".' .format(
                    ', '.join(macro_names),
                    versionPreviewMethodName
                )
            )