"""
setup some "static" variables
"""

from django.utils.translation import ugettext as _
from django.utils.safestring import mark_safe

from PyLucid import PYLUCID_VERSION_STRING
from PyLucid.tools.shortcuts import makeUnique

from django.conf import settings

def static(request):
    """
    A django TEMPLATE_CONTEXT_PROCESSORS
    http://www.djangoproject.com/documentation/templates_python/#writing-your-own-context-processors
    """
    return {
        "powered_by": mark_safe(
            '<a href="http://www.pylucid.org">PyLucid v%s</a>' \
                                                        % PYLUCID_VERSION_STRING
        ),
        # This value would be changed in index._render_cms_page(), if the
        # plugin manager or any plugin set request.anonymous_view = False
        "robots": "index,follow", # TODO: remove in v0.9, see: ticket:161
    }


def add_dynamic_context(request, context):
    """
    Add some dynamic stuff into the context.
    """
    URLs = context["URLs"]

    #___________________________________________________________________________

    if hasattr(request, "user") and request.user.username != "":
        # User is logged in
        url = URLs.commandLink("auth", "logout")
        txt = "%s [%s]" % (_("Log out"), request.user.username)
    else:
#        url = URLs.commandLink("auth", "login/?next=%s" % request.path)
        url = URLs.commandLink("auth", "login")
        txt = _("Log in")

    context["login_link"] = mark_safe('<a href="%s">%s</a>' % (url, txt))

    # Put the language information into the context, if it exists.
    # see: http://www.djangoproject.com/documentation/i18n/
    if hasattr(request, 'session') and 'django_language' in request.session:
        context['django_language']=request.session['django_language']
    else:
        context['django_language']=''


def add_css_tag(context, content, plugin_name, method_name):
    """
    Add a unique CSS-ID and a class name defined in the settings.py
    """
    id = plugin_name + u"_" + method_name
    id = makeUnique(id, context["CSS_ID_list"])
    context["CSS_ID_list"].append(id)
    class_name = getattr(settings, "CSS_PLUGIN_CLASS_NAME", "PyLucidPlugins")

    try:
        return (
            u'<div class="%(c)s %(p)s" id="%(id)s">\n'
            '%(content)s\n'
            '</div>\n'
        ) % {
            "c": class_name, "p": plugin_name, "m": method_name,
            "id": id, "content": content,
        }
    except UnicodeDecodeError:
        # FIXME: In some case (with mysql_old) we have trouble here.
        # I get this traceback on www.jensdiemer.de like this:
        #
        #Traceback (most recent call last):
        #File ".../django/template/__init__.py" in render_node
        #    750. result = node.render(context)
        #File ".../PyLucid/defaulttags/lucidTag.py" in render
        #    102. content = self._add_unique_div(context, content)
        #File ".../PyLucid/defaulttags/lucidTag.py" in _add_unique_div
        #    73. return u'<div class="%s" id="%s">\n%s\n</div>\n' % (
        #
        #UnicodeDecodeError at /FH-D-sseldorf/
        #'ascii' codec can't decode byte 0xc3 in position 55: ordinal not in range(128)
        #
        #content += "UnicodeDecodeError hack active!"
        return (
            '<div class="%(c)s %(p)s" id="%(id)s">\n'
            '%(content)s\n'
            '</div>\n'
        ) % {
            "c": class_name, "p": str(plugin_name), "m": str(method_name),
            "id": str(id), "content": content,
        }