# -*- coding: utf-8 -*-

import re

from django.shortcuts import render_to_response

from django.template import RequestContext

from django.views.generic.base import TemplateView

from django.conf import settings

import user_agents

from hdabo.models import Datasheet, TaggedSheet

from django.http.response import Http404

def datasheet(request, hda_id=None):

    """

    Methode Vue affichant le détail d'une fiche HDA.

    Cette vue affiche en fait un résumé de la notice mise en relation avec les notices liées, via les mots clefs.

    """

    MAX_TAG = 15

    MAX_RELATED = 50

    datasheet = None

    try:

        datasheet = Datasheet.objects.select_related("organisation").get(hda_id=hda_id)

    except Datasheet.DoesNotExist:

        raise Http404("The datasheet %s is not found."%hda_id)

    domain = re.findall(r"^https?://(www\.)?([^/]+)",datasheet.url)

    ordered_tags = TaggedSheet.objects.filter(datasheet=datasheet,order__lte=MAX_TAG).select_related("tag").order_by('order')

    tags = [t.tag.id for t in ordered_tags]

    tagorders = dict([(t.tag.id,t.order) for t in ordered_tags])

    tsqs = TaggedSheet.objects.exclude(datasheet=datasheet).filter(order__lte=MAX_TAG,tag_id__in=tags)

    dsscores = {}

    addtoscore = 2*MAX_TAG

    for ts in tsqs:

        a_order = tagorders[ts.tag_id]

        b_order = ts.order

        score = addtoscore - a_order - b_order

        dsscore = dsscores.get(ts.datasheet_id,0)

        dsscores[ts.datasheet_id] = dsscore + score

    relatedqs = Datasheet.objects.filter(id__in=dsscores.keys()).select_related("organisation")

    relatedds = [{

        'id': ds.id,

        'hda_id': ds.hda_id,

        'title': ds.title,

        'description': ds.description,

        'organisation_name': ds.organisation.name if ds.organisation else '',

        'organisation_url': ds.organisation.website if ds.organisation else '',

        'score': dsscores.get(ds.id,0),

    } for ds in relatedqs]

    relatedds = sorted(relatedds, key=lambda ds: -ds['score'])[:MAX_RELATED]

    for ds in relatedds:

        otqs = TaggedSheet.objects.filter(datasheet_id=ds['id'],order__lte=MAX_TAG).select_related("tag").order_by('order')

        ds['ordered_tags'] = [{

            'id': t.tag.id,

            'label': t.tag.label,

            'order': t.order,

            'common' : (t.tag.id in tags)

        } for t in otqs]

    return render_to_response(

        "notice.html",

        {

            'datasheet':datasheet,

            'domain': domain[0][1] if domain else "",

            'ordered_tags': ordered_tags,

            'related': relatedds,

        },

        context_instance=RequestContext(request)

    )

class HdalabAboutPage(TemplateView):

    """

    Classe de vue en charge de l'affichage de la page à propos.

    C'est une simple django.views.generic.TemplateView qui ajoute quelques informations dans le contexte de rendu du template.

    """

    template_name = "a_propos.html"

    def get_context_data(self, **kwargs):

        context = super(HdalabAboutPage, self).get_context_data(**kwargs)

        ua_str = self.request.META.get('HTTP_USER_AGENT', '')

        ua = user_agents.parse(ua_str)

        context['add_kanji_font'] = (ua.os.family in settings.OLDER_WINDOWS)

        context['tutorial_video_urls'] = getattr(settings, 'RENKAN_TUTORIAL_VIDEO_URLS', [])

        return context