from django.shortcuts import render_to_response
from django.http import HttpResponseRedirect
from django.template import RequestContext

from django.contrib.auth.decorators import login_required

from notification.models import NoticeSetting, NoticeType, NOTICE_MEDIA


@login_required
def notice_settings(request):
    """
    The notice settings view.
    
    Template: :template:`notification/notice_settings.html`
    
    Context:
        
        notice_types
            A list of all :model:`notification.NoticeType` objects.
        
        notice_settings
            A dictionary containing ``column_headers`` for each ``NOTICE_MEDIA``
            and ``rows`` containing a list of dictionaries: ``notice_type``, a
            :model:`notification.NoticeType` object and ``cells``, a list of
            tuples whose first value is suitable for use in forms and the second
            value is ``True`` or ``False`` depending on a ``request.POST``
            variable called ``form_label``, whose valid value is ``on``.
    """
    notice_types = NoticeType.objects.all()
    settings_table = []
    for notice_type in notice_types:
        settings_row = []
        for medium_id, medium_display in NOTICE_MEDIA:
            form_label = "%s_%s" % (notice_type.label, medium_id)
            setting = NoticeSetting.for_user(request.user, notice_type, medium_id)
            if request.method == "POST":
                if request.POST.get(form_label) == "on":
                    if not setting.send:
                        setting.send = True
                        setting.save()
                else:
                    if setting.send:
                        setting.send = False
                        setting.save()
            settings_row.append((form_label, setting.send))
        settings_table.append({"notice_type": notice_type, "cells": settings_row})
    
    if request.method == "POST":
        next_page = request.POST.get("next_page", ".")
        return HttpResponseRedirect(next_page)
    
    settings = {
        "column_headers": [medium_display for medium_id, medium_display in NOTICE_MEDIA],
        "rows": settings_table,
    }
    
    return render_to_response("notification/notice_settings.html", {
        "notice_types": notice_types,
        "notice_settings": settings,
    }, context_instance=RequestContext(request))
