from django.http import Http404
from django.shortcuts import render_to_response
from django.template import RequestContext

from djangopypi.models import Project, Release, Channel


def list_channels(request, template_name="djangopypi/simple.html"):
    channels = Channel.objects.all().order_by("name")
    context = RequestContext(request, { "dists": channels })
    return render_to_response(template_name, context_instance=context)


def show_links(request, channel, dist_name,
        template_name="djangopypi/show_links.html"):
    try:
        project = Project.objects.get(name=dist_name)
        releases = (Release.objects
                    .filter(project__name=dist_name, channel__name=channel)
                    .order_by('-version'))
    except Project.DoesNotExist:
        raise Http404

    context = RequestContext(request, {
        "dist_name": dist_name,
        "releases": releases,
    })

    return render_to_response(template_name, context_instance=context)


def show_channel(request, channel,
        template_name="djangopypi/show_channel.html"):
    try:
        projects = (Project.objects
                    .filter(releases__channel__name=channel)
                    .distinct().all().order_by('name'))

        channel = Channel.objects.get(name=channel)
    except Project.DoesNotExist:
        raise Http404

    context = RequestContext(request, {
        "projects": projects,
        "channel": channel,
    })

    return render_to_response(template_name, context_instance=context)