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

import re

from django.shortcuts import render_to_response

from django.template import RequestContext

from django.views.generic.base import TemplateView

import user_agents

from hdabo.models import Datasheet, TaggedSheet

from django.http.response import Http404

def datasheet(request, hda_id=None):

    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)

    )

OLDER_WINDOWS = [

    u'Windows', u'Windows Mobile', u'Windows XP',

    u'Windows ME', u'Windows 2000', u'Windows NT 4.0',

    u'Windows CE', u'Windows 95', u'Windows 98',

    u'Windows 3.1', u'Windows NT'

]

class HdalabAboutPage(TemplateView):

    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)

        if ua.os.family in OLDER_WINDOWS:

            context['add_kanji_font'] = True

        else:

            context['add_kanji_font'] = False

        return context