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

'''

Created on Jan 31, 2012

@author: ymh

'''

from django.conf import settings

from django.core.cache import cache

from django.db.models import Q, Count

from django.http import HttpResponse

from hdabo.models import Tag, Datasheet, TaggedSheet

from hdalab.models import HdaSession, Country, TagYears, DatasheetExtras

from hdalab.models.dataviz import DbpediaFieldsTranslation, DbpediaFields

from hdalab.models.categories import WpCategory, WpCategoryInclusion, TagWpCategory

from hdalab.utils import fix_cache_key

import copy

import django.utils.simplejson as json

import hmac

import itertools

import uuid

def taginfo(request):

    label = request.GET.get('label', None)

    resobj = {'requested_label' : label}

    resobj["content_count"] = Datasheet.objects.filter(taggedsheet__tag__label__iexact = label).distinct().count()

    res = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = label).order_by('-dbpedia_uri')[0:1]

    if len(res) == 1:

        restag = res.get()

        resobj["dbpedia_uri"] = restag.dbpedia_uri

        if resobj["dbpedia_uri"] is not None and restag.dbpedia_fields is not None:

            dbfield = restag.dbpedia_fields

            resobj["abstract"] = dbfield.abstract

            resobj["dbpedia_label"] = dbfield.label

            resobj["thumbnail"] = dbfield.thumbnail

            transqs = DbpediaFieldsTranslation.objects.filter(master=dbfield, language_code=request.LANGUAGE_CODE)[0:1]

            if transqs:

                trans = transqs.get()

                resobj['translated_abstract'] = trans.abstract

                resobj['translated_label'] = trans.label

            else:

                resobj['translated_abstract'] = dbfield.abstract

                resobj['translated_label'] = dbfield.label

    #res = Tag.objects.filter(label__iexact = label).order_by('-wikipedia_url')[0:1]

    #if len(res) == 1:

    #    resobj["wikipedia_url"] = res.get().wikipedia_url

    if 'translated_label' in resobj:

        wikipedia_label = resobj['translated_label']

    else:

        wikipedia_label = label

    wikipedia_label = wikipedia_label[0].capitalize() + wikipedia_label[1:]

    resobj["wikipedia_url"] = "http://%s.wikipedia.org/wiki/%s" % (request.LANGUAGE_CODE,wikipedia_label.replace(' ', '_'))

# We don't use links at the moment, so I'll comment this line to speed up requests

#    resobj["links"] = [{'subject':tl.subject.label, 'object':tl.object.label} for tl in TagLinks.objects.select_related().filter(Q(subject__label__iexact = label) | Q(object__label__iexact = label))]

    return HttpResponse(content=json.dumps(resobj), mimetype='application/json')

def tagtranslation(request):

    labels = request.GET.get('labels',None)

    if not labels:

        return HttpResponse(content=json.dumps({}), mimetype='application/json')

    labelslist = [lbl.strip() for lbl in labels.split(",")]

    masters = []

    for lbl in labelslist:

        labelqs = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = lbl)[0:1]

        if len(labelqs) > 0:

            tag = labelqs.get()

            if tag.dbpedia_fields:

                masters.append(tag.dbpedia_fields)

    translationqs = DbpediaFieldsTranslation.objects.select_related("master", "master__tag").filter(master__in = masters, language_code=request.LANGUAGE_CODE)

    translations = dict([(t.master.label, t.label) for t in translationqs])

    return HttpResponse(content=json.dumps(translations), mimetype='application/json')

def subcat(category, globtags, level, max_level ):

    # recursive function used by cattree

    taglabels = [k for k in dict([(t.label,t.label) for t in tags])]

    resobj = {

          'category': category.label,

          'tags': [],

          'contents': []

          }

    for label in taglabels:

        if label == catlabel:

            globtags[label] = {'level': level, 'access': resobj }

        else:

            tag_in_list = {'label' : label, 'contents': []}

            resobj['tags'].append(tag_in_list)

            globtags[label] = {'level': (level + 1), 'access': tag_in_list }

    if level < max_level:

        resobj['sub_categories'] = [subcat(subcats[i], globtags, level + 1, max_level ) for i in range(len(subcats))]

    return resobj

def cleantags(category):

    if category.has_key('contents') and len(category['contents']) == 0:

        del category['contents']

    if category.has_key('tags'):

        if len(category['tags']) == 0:

            del category['tags']

    if category.has_key('sub_categories'):

        sub_cats = []

        for sub_cat in category['sub_categories']:

            cat = cleantags(sub_cat)

            if cat.has_key('tags') or cat.has_key('sub_categories') or cat.has_key('contents'):

                sub_cats.append(cat)

        if len(category['sub_categories']) == 0:

            del category['sub_categories']

    return category

def cattree(request):

    # Gets the category tree from a label

    MAX_TAG_ORDER = 5

    MAX_LEVEL = 3

    label = request.GET.get('label', None)

    globtags = {}

    resobj = None

    master_category = WpCategory.objects.filter(label__iexact=label)[0:1]

    if len(master_category):

        resobj = subcat(master_category[0], globtags, 1, MAX_LEVEL )

#        resobj['contents'] = [{'id': d.id, 'title': d.title, 'tags': [t.label for t in d.tags.filter(taggedsheet__order__lte=5)]} for d in datasheets]

    return HttpResponse(content=json.dumps(resobj), mimetype='application/json')

def sessioninfo(request):

    data = json.loads(request.GET.get('data', "{}"))

    write = False

    if 'sessionid' in request.GET:

        request.session['sessionid'] = request.GET['sessionid']

    if 'sessionkey' in request.GET:

        request.session['sessionkey'] = request.GET['sessionkey']

    if 'sessionid' in request.session:

        sessionid = request.session['sessionid']

        if HdaSession.objects.filter(sessionid=sessionid).count() == 1:

            sessionkey = request.session.get('sessionkey',None)

            hm = hmac.new(settings.SECRET_KEY, sessionid)

            if hm.hexdigest() == sessionkey:

                write = True            

        else:

            del request.session['sessionid']

    if 'sessionid' not in request.session:

        sessionid = unicode(uuid.uuid1())

        HdaSession.objects.create(sessionid=sessionid, data=json.dumps({}))

        write = True

        request.session['sessionid'] = sessionid

        request.session['sessionkey'] = hmac.new(settings.SECRET_KEY, sessionid).hexdigest()

    if write and data:

        HdaSession.objects.filter(sessionid=sessionid).update(data=json.dumps(data))

    else:

        data = HdaSession.objects.get(sessionid=sessionid).data

        data = json.loads(data) if data else {}           

    resobj = {'data': data, "write_allowed" : write, "sessionid": sessionid }

    if write:

        resobj['sessionkey'] = request.session['sessionkey']

    return HttpResponse(content=json.dumps(resobj), mimetype='application/json')

def tagsearch(request):

    q = request.GET.get('term',None)

    if q:

        lq = q.lower()

    qs = Tag.objects.filter(datasheet__validated=True).filter( Q(label__icontains = q ) | Q(dbpedia_fields__translations__label__icontains = q, dbpedia_fields__translations__language_code=request.LANGUAGE_CODE), ~Q(dbpedia_uri = None)) if q else Tag.objects.filter(~Q(dbpedia_uri = None))       

    qs = qs.annotate(nb=Count('datasheet')).order_by('-nb')[:20]

    qslist = list(qs)

    transqs = DbpediaFieldsTranslation.objects.filter(master__tag__in = qslist, language_code=request.LANGUAGE_CODE).select_related("master")

    translations = dict([(tr.master.tag_id, tr.label) for tr in transqs])

    res = []

    for t in qslist:

        resobj = {'value':t.label,'nb':t.nb}

        if t.id in translations:

            resobj['label'] = translations[t.id]

        else:

            resobj['label'] = t.label

        if q is None or resobj['label'].lower().find(lq) != -1:

            res.append(resobj)

    return HttpResponse(content=json.dumps(res), mimetype='application/json')

def catsearch(request):

    q = request.GET.get('term',None)

    res = [{'value':t.label} for t in qs]

    return HttpResponse(content=json.dumps(res), mimetype='application/json')

def filter(request):

    periode = request.GET.get('period',None)

    label = request.GET.get('label', None)

    country = request.GET.get('country', None)

    contentlist = request.GET.get('contentlist', None)

    max_tag_order = request.GET.get('mto', 12)

    content_count = request.GET.get('contentcount', 12)

    tag_count = request.GET.get('tagcount', 30)

    key_parts = ("filter",request.LANGUAGE_CODE,periode,label,country,contentlist,max_tag_order,content_count,tag_count)

    key_parts = [unicode(p).encode("utf-8") for p in key_parts]

    cache_key = fix_cache_key("-".join(key_parts))

    outputstr = cache.get(cache_key)

    if outputstr is None:

        matchtagids = []

        tagqs = Tag.objects.exclude(category__label__in = ['Datation', 'Localisation', 'Discipline artistique']).filter(~Q(dbpedia_uri = None))

        countryqs = Country.objects

        discqs = Tag.objects.filter(~Q(dbpedia_uri = None), category__label = u'Discipline artistique').select_related('dbpedia_fields')

        yearqs = TagYears.objects

        contentqs = Datasheet.objects.filter(validated=True)

        labeltranslations = []

        if label or periode or country or contentlist :

            matchtagqslist = []

            if periode:

                years = periode.split(",")

                start_year = int(years[0])

                end_year = int(years[0:2][-1])

                delta = max(1, (end_year-start_year)/2)

                minstart = start_year - delta

                maxend = end_year + delta

                matchtagqs = Tag.objects.filter(~Q(dbpedia_uri = None),

                                                years__end_year__gte = start_year, 

                                                years__start_year__lte = end_year,

                                                years__end_year__lte = maxend,

                                                years__start_year__gte = minstart,

                                                )

                matchtagqslist.append(matchtagqs)

            if label:

                for txtlbl in label.split(","):

                    matchtagqs = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = txtlbl.strip())

                    matchtagqslist.append(matchtagqs)

            if country:

                for country_uri in country.split(","):

                    matchtagqs = Tag.objects.filter(~Q(dbpedia_uri = None),locatedin__country__dbpedia_uri = country_uri)

                    matchtagids += [t.id for t in matchtagqs if t.id not in matchtagids]

                    matchtagqslist.append(matchtagqs)

            if contentlist:

                contentqs = contentqs.filter(id__in = contentlist.split(","))

            tagcond = None

            tagcondid = None

            for matchtagqs in matchtagqslist:

                newcond = Q(id__in = TaggedSheet.objects.filter(tag__in = copy.deepcopy(matchtagqs), order__lte = max_tag_order).values('datasheet_id'))

                newcondid = Q(id__in = matchtagqs)

                tagcond = newcond if tagcond is None else (tagcond & newcond)

                tagcondid = newcondid if tagcondid is None else (tagcondid | newcondid)

            contentqs = contentqs.filter(tagcond).distinct()

            matchtagidsqs = list(Tag.objects.select_related("dbpedia_fields").only("id").filter(tagcondid))

            matchtagids = [t.id for t in matchtagidsqs]            

            masters = [t.dbpedia_fields for t in matchtagidsqs if t.dbpedia_fields is not None]

            translationqs = DbpediaFieldsTranslation.objects.select_related("master", "master__tag").filter(master__in = masters, language_code=request.LANGUAGE_CODE)    

            labeltranslations = [{'label':t.master.label, 'translated_label':t.label} for t in translationqs]

            tagqs = tagqs.filter(datasheet__in = contentqs)

            countryqs = countryqs.filter(includes__tag__taggedsheet__datasheet__in = contentqs)

            discqs = discqs.filter(datasheet__in = contentqs)

            yearqs = yearqs.filter(tag__taggedsheet__datasheet__in = contentqs)