import re

from django.core.management.base import BaseCommand
from django.template import base, defaulttags
from django.template.loader import get_template
from django.template.base import TextNode

# Monkey patching
render_tags = ('block ', 'endblock ', 'extends ', 'include ')
BLOCK_TAG_START = []
BLOCK_TAG_START2 = '%s (%s)' % (re.escape('{%'), '|'.join(render_tags))

for tag in render_tags:
    BLOCK_TAG_START.append('{%% %s' % tag)


base.BLOCK_TAG_START = tuple(BLOCK_TAG_START)
base.VARIABLE_TAG_START = '{{ block.super'
base.tag_re = (re.compile('(%s.*?%s|%s.*?%s|%s.*?%s)' %
                          (BLOCK_TAG_START2, re.escape(base.BLOCK_TAG_END),
                           re.escape(base.VARIABLE_TAG_START), re.escape(base.VARIABLE_TAG_END),
                           re.escape(base.COMMENT_TAG_START), re.escape(base.COMMENT_TAG_END))))
# End monkey patching


from django.template.base import VariableNode


def do_load(parser, token):
    defaulttags.register.tags['load_original'](parser, token)
    return TextNode('{%% %s %%}' % token.contents)


defaulttags.register.tags['load_original'] = defaulttags.register.tags['load']
defaulttags.register.tags['load'] = do_load


def render_patch(self, context):
    if self.filter_expression.token == 'block.super':
        return self.render_original(context)
    return "{{ %s }}" % self.filter_expression.token


VariableNode.render_original = VariableNode.render
VariableNode.render = render_patch


class Command(BaseCommand):
    args = '<None>'
    help = 'Update employees'

    def handle(self, *args, **options):
        unify_templates = ['admin/index.html']

        for unify_template in unify_templates:
            template = get_template(unify_template)
            template_unify = template.render({})
            destination_name = template.origin.name.replace('.html', '.unify.html')
            print(destination_name)
            f = open(destination_name, 'w')
            f.write(template_unify)
            f.close()