"""
This is a very simple news application, with most of the expected features
like:

    * News categories/topics
    * Searchable archives
"""
from django.shortcuts import render_to_response, get_object_or_404
from django.template import RequestContext
import django.views.generic.list_detail as gv_list_detail
from django.http import HttpResponseRedirect
from django.contrib.auth.models import User
from django import forms
from django.db.models import Q

from game.web.apps.news.models import NewsTopic, NewsEntry

# The sidebar text to be included as a variable on each page. There's got to
# be a better, cleaner way to include this on every page.
sidebar = """
    <p class='doNotDisplay doNotPrint'>This page&rsquo;s menu:</p>
    <ul id='side-bar'>
      <li><a href='/news/archive'>News Archive</a></li>
      <li><a href='/news/search'>Search News</a></li>
    </ul>
"""

class SearchForm(forms.Form):
    """
    Class to represent a news search form under Django's newforms. This is used
    to validate the input on the search_form view, as well as the search_results
    view when we're picking the query out of GET. This makes searching safe
    via the search form or by directly inputing values via GET key pairs.
    """
    search_terms = forms.CharField(max_length=100, min_length=3, required=True)

def show_news(request, entry_id):
    """
    Show an individual news entry. Display some basic information along with
    the title and content.
    """
    news_entry = get_object_or_404(NewsEntry, id=entry_id)

    pagevars = {
        "page_title": "News Entry",
        "news_entry": news_entry,
        "sidebar": sidebar
    }

    context_instance = RequestContext(request)
    return render_to_response('news/show_entry.html', pagevars, context_instance)

def news_archive(request):
    """
    Shows an archive of news entries.

    TODO: Expand this a bit to allow filtering by month/year.
    """
    news_entries = NewsEntry.objects.all().order_by('-date_posted')
    # TODO: Move this to either settings.py or the SQL configuration.
    entries_per_page = 15

    pagevars = {
        "page_title": "News Archive",
        "browse_url": "/news/archive",
        "sidebar": sidebar
    }
    
    return gv_list_detail.object_list(request, news_entries, template_name='news/archive.html', extra_context=pagevars, paginate_by=entries_per_page)

def search_form(request):
    """
    Render the news search form. Don't handle much validation at all. If the
    user enters a search term that meets the minimum, send them on their way
    to the results page.
    """
    if request.method == 'GET':
        # A GET request was sent to the search page, load the value and
        # validate it.
        search_form = SearchForm(request.GET)
        if search_form.is_valid():
            # If the input is good, send them to the results page with the
            # query attached in GET variables.
            return HttpResponseRedirect('/news/search/results/?search_terms='+ search_form.cleaned_data['search_terms'])
    else:
        # Brand new search, nothing has been sent just yet.
        search_form = SearchForm()

    pagevars = {
        "page_title": "Search News",
        "search_form": search_form,
        "debug": debug,
        "sidebar": sidebar
    }

    context_instance = RequestContext(request)
    return render_to_response('news/search_form.html', pagevars, context_instance)

def search_results(request):
    """
    Shows an archive of news entries. Use the generic news browsing template.
    """
    # TODO: Move this to either settings.py or the SQL configuration.
    entries_per_page = 15

    # Load the form values from GET to validate against.
    search_form = SearchForm(request.GET)
    # You have to call is_valid() or cleaned_data won't be populated.
    valid_search = search_form.is_valid()
    # This is the safe data that we can pass to queries without huge worry of
    # badStuff(tm).
    cleaned_get = search_form.cleaned_data

    # Perform searches that match the title and contents.
    # TODO: Allow the user to specify what to match against and in what
    # topics/categories.
    news_entries = NewsEntry.objects.filter(Q(title__contains=cleaned_get['search_terms']) | Q(body__contains=cleaned_get['search_terms']))

    pagevars = {
        "page_title": "Search Results",
        "searchtext": cleaned_get['search_terms'],
        "browse_url": "/news/search/results",
        "sidebar": sidebar
    }
    
    return gv_list_detail.object_list(request, news_entries, template_name='news/archive.html', extra_context=pagevars, paginate_by=entries_per_page)