views.py

#
# Copyright (c) 2015 NIBIO <http://www.nibio.no/>. 
# 
# This file is part of VIPSWeb.
# VIPSWeb is free software: you can redistribute it and/or modify
# it under the terms of the NIBIO Open Source License as published by 
# NIBIO, either version 1 of the License, or (at your option) any
# later version.
# 
# VIPSWeb 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
# NIBIO Open Source License for more details.
#
# You should have received a copy of the NIBIO Open Source License
# along with VIPSWeb.  If not, see <http://www.nibio.no/licenses/>.
# 

from django.shortcuts import render
from django.core.exceptions import ObjectDoesNotExist
from django.http import Http404
from information.models import InformationLocale, Information
from django.urls import reverse


def index(request):
    # Check that root element exists
    try:
        root_information = Information.objects.filter(parent_information__isnull=True)
        return detail(request,root_information[0].id)
    except:
        # Fallback: Return an empty page
        context = {}
        return render(request, 'information/index.html', context)

def detail(request, information_id):
    try:
        information_locale = InformationLocale.get_information_locale_with_fallback(information_id, request.LANGUAGE_CODE)
        # Is there a parent?
        #parent_information = information_locale.information.parent_information
        # We get all the children too
        #children_locales = []
        #for child in information_locale.information.children.all():
        #    children_locales.append(InformationLocale.get_information_locale_with_fallback(child.pk))
        
        context = {
                   'information_locale' : information_locale, 
                   #'parent_information' : parent_information,
                   #'children_locales':children_locales,
                   'breadcrumb': get_breadcrumb(information_locale.information, request.LANGUAGE_CODE),
                   'menu_html': get_menu_html(None, information_id, request.LANGUAGE_CODE)
                   }
        return render(request, 'information/detail.html', context)
    except ObjectDoesNotExist:
        raise Http404("No information page found with id=%s" % information_id)
        

def get_breadcrumb(information, language):
    active_id= information.pk
    breadcrumb = []#[]
    while information != None:
        information_locale = InformationLocale.get_information_locale_with_fallback(information.pk, language)
        children_locales = []
        for child in information_locale.information.children.all():
            children_locales.append(InformationLocale.get_information_locale_with_fallback(child.pk))
        breadcrumb.append({
                           "id":information_locale.information.pk,
                           "title":information_locale.headline,
                           "active" : information.pk == active_id,
                           "children_locales" : children_locales
                           })
        information = information.parent_information
    return breadcrumb

menu_template = """
    <nav>
        <ul class="nav">
        %s
        </ul>
    </nav>
    """

link_title = """<a href="%s">%s</a>"""

toggleable_item_template="""
<li class="%s">
  %s
  <ul class="nav">
    %s
  </ul>
</li>
"""
simple_item_template = """<li class="%s">%s</li>"""

## Recursive method
def get_menu_html(parent_information, active_information_pk, language):
    
    # We start with backtracking from the active information object
    if(parent_information == None):
        items = Information.objects.filter(parent_information__isnull=True)
    else:
        items = Information.objects.filter(parent_information=parent_information)
    
    items_html = []
    for info in items:
        info_locale = InformationLocale.get_information_locale_with_fallback(info.pk, language)
        if info.pk == int(active_information_pk):
            active_class = "active"
            title = """<span class="active">%s</span>""" % info_locale.headline
        else:
            active_class = ""
            title = link_title % (reverse('information:detail', kwargs={"information_id":info.pk}), info_locale.headline)

        child_menu_html = get_menu_html(info, active_information_pk, language)
        # If item has no child items, create simple item
        if child_menu_html == "":
            items_html.append(simple_item_template % (active_class, title))
        # Else create complex item
        else:
            items_html.append(toggleable_item_template % (active_class, title, child_menu_html))
        
    return "".join(items_html)