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import calendar # timegm

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import logging

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from django.http import HttpResponse, HttpResponseRedirect, Http404

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from django.shortcuts import render

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from django.utils import timezone, http

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from qrurls.models import URL, URLItem

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log = logging.getLogger('qrurls.views')

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"""

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    Public frontend UI.

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"""

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def http_datetime (dt) :

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    return http.http_date(calendar.timegm(dt.utctimetuple()))

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def index (request) :

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    urls = URL.objects.all()

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    return render(request, 'qrurls/index.html', dict(

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        urls    = urls,

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    ))

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def shorturl (request, shorturl=None) :

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    """

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        Primary frontend for redirecting based on current time.

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    """

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    # redirect, either directly, or to image()

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    response = HttpResponseRedirect(url)

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    response['Vary'] = ''

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    response['Last-Modified'] = http_datetime(modified)

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    return response

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def item (request, shorturl, item_id) :

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    """

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        Frontend for a specific item.

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    """

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    if url_item.url :

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        response = HttpResponseRedirect(url_item.url)

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    elif url_item.image :

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        response = render(request, 'qrurls/image.html', dict(

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            title   = url_item.title(),

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            image   = url_item.image,

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        ))

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    else :

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        raise Http404()

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    # set cache

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    response['Vary'] = ''

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    response['Last-Modified'] = http_datetime(url_item.last_modified())

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    return response

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