from django.conf import settings

from django.contrib.auth.decorators import login_required

from django.core.urlresolvers import reverse

from django.db import IntegrityError

from django.db.models import Q

from django.forms.util import ErrorList

from django.http import HttpResponse, Http404, HttpResponseRedirect, \

    HttpResponseForbidden, HttpResponseServerError, HttpResponseBadRequest

from django.shortcuts import render_to_response, get_object_or_404, \

    get_list_or_404

from django.template import RequestContext

from django.template.loader import render_to_string

from django.utils.html import escape

from django.utils.translation import ugettext as _, ungettext

from httplib import CONFLICT

from ldt.core.models import Owner

from ldt.text.utils import boolean_convert

from lxml import etree

from lxml.html import fromstring, fragment_fromstring

from ldt.text.models import *

from string import Template

from urllib2 import urlparse

from utils import *

import StringIO

import base64

import cgi

import django.core.urlresolvers

import ldt.auth as ldt_auth

import ldt.utils.path as ldt_utils_path

import logging

import lucene

import tempfile

import uuid

## Filters the annotation depending on the request parameters

## Returns an xml containing the resulting annotations

def filter_annotation(request, uri=None, filter=None, limit=None, creator=None):

    annotlist = None

    query = Q()    

    if request.GET.get('uri'):

        query &= Q(uri=request.GET.get('uri'))

    if request.GET.get('creator'):

        query &= Q(creator=request.GET.get('creator'))

    if request.GET.get('filter') and len(request.GET.get('filter')) > 0:

        query &= Q(text__icontains=request.GET.get('filter'))

    annotlist = Annotation.objects.filter(query)

    if request.GET.get('limit'):

        nb = request.GET.get('limit')

        #offset = request.GET.get('limit')[1]

        annotlist = annotlist[:nb]

    #create xml

    iri = lxml.etree.Element('iri')

    doc = lxml.etree.ElementTree(iri)

    for annot in annotlist:

        textannotation = lxml.etree.SubElement(iri, 'text-annotation')

        id = lxml.etree.SubElement(textannotation,'id')

        id.text = annot.external_id

        uri = lxml.etree.SubElement(textannotation,'uri')

        uri.text = annot.uri

        if annot.tags:

            if type(annot.tags) is unicode:

                annot.tags = eval(annot.tags)

            tags = lxml.etree.SubElement(textannotation,'tags')

            ltags = normalize_tags(annot.tags)

            for t in ltags:

                tag = lxml.etree.SubElement(tags, 'tag')

                tag.text = t

        content = lxml.etree.SubElement(textannotation,'content')

        color = lxml.etree.SubElement(content,'color')

        color.text = annot.color

        description = lxml.etree.SubElement(content,'description')

        description.text = annot.description

        title = lxml.etree.SubElement(content,'title')

        title.text = annot.title

        text = lxml.etree.SubElement(content,'text')

        text.text = annot.text

        meta = lxml.etree.SubElement(textannotation,'meta')

        contributor = lxml.etree.SubElement(meta, "contributor")

        contributor.text = annot.contributor

        creator = lxml.etree.SubElement(meta, "contributor")

        creator.text = annot.creator

        creationdate = lxml.etree.SubElement(meta, "created")

        creationdate.text = str(annot.creation_date)

        updatedate = lxml.etree.SubElement(meta, "modified")

        updatedate.text = str(annot.update_date)

    return HttpResponse(lxml.etree.tostring(doc, pretty_print=True), mimetype="text/xml;charset=utf-8")

## Creates an annotation from a urlencoded xml content

## Returns an xml-structured annotation

#@login_required

def create_annotation(request, content):

    cont = base64.urlsafe_b64decode(request.POST["content"])

    doc = lxml.etree.fromstring(cont)

    id = unicode(doc.xpath("/iri/text-annotation/id/text()")[0])

    if id is None:

        id = generate_uuid()

    uri = unicode(doc.xpath("/iri/text-annotation/uri/text()")[0])

    ltags = []

    for tag in doc.xpath("/iri/text-annotation/tags/tag/text()"):

        ltags.append(unicode(tag))

    tags=normalize_tags(ltags)

    title = unicode(doc.xpath("/iri/text-annotation/content/title/text()")[0])

    desc = unicode(doc.xpath("/iri/text-annotation/content/description/text()")[0])

    text = unicode(doc.xpath("/iri/text-annotation/content/text/text()")[0])

    color = unicode(doc.xpath("/iri/text-annotation/content/color/text()")[0])

    creator = unicode(doc.xpath("/iri/text-annotation/meta/creator/text()")[0])

    contributor = unicode(doc.xpath("/iri/text-annotation/meta/contributor/text()")[0])

    creation_date = unicode(doc.xpath("/iri/text-annotation/meta/created/text()")[0])

    update_date = unicode(doc.xpath("/iri/text-annotation/meta/modified/text()")[0])

    try:

        annotation = Annotation.create_annotation(external_id=id, uri=uri, tags=tags, title=title, description=desc, text=text, color=color, creator=creator, contributor=contributor, creation_date=creation_date, update_date=update_date)

        annotation.save()

        return HttpResponse(lxml.etree.tostring(doc, pretty_print=True), mimetype="text/xml;charset=utf-8")

        #return doc

    except:

    #except Annotation.IntegrityError:

        #print 'This id is already used! Please choose another one!'

        raise CONFLICT

## Gets an annotation (from its id)

## Returns the xml-structured annotation

def get_annotation(request, id):

    try:

        annot = Annotation.objects.get(external_id=request.GET.get('id',''))

    except:

    #except Annotation.DoesNotExist:

        raise Http404

    iri = lxml.etree.Element('iri')

    doc = lxml.etree.ElementTree(iri)

    textannotation = lxml.etree.SubElement(iri, 'text-annotation')

    id = lxml.etree.SubElement(textannotation,'id')

    id.text = annot.external_id

    uri = lxml.etree.SubElement(textannotation,'uri')

    uri.text = annot.uri

    if annot.tags:

        if type(annot.tags) is unicode:

            annot.tags = eval(annot.tags)

        tags = lxml.etree.SubElement(textannotation,'tags')

        ltags = normalize_tags(annot.tags)

        for t in ltags:

            tag = lxml.etree.SubElement(tags, 'tag')

            tag.text = t

    content = lxml.etree.SubElement(textannotation,'content')

    color = lxml.etree.SubElement(content,'color')

    color.text = annot.color

    description = lxml.etree.SubElement(content,'description')

    description.text = annot.description

    title = lxml.etree.SubElement(content,'title')

    title.text = annot.title

    text = lxml.etree.SubElement(content,'text')

    text.text = annot.text

    meta = lxml.etree.SubElement(textannotation,'meta')

    contributor = lxml.etree.SubElement(meta, "contributor")

    contributor.text = annot.contributor

    creator = lxml.etree.SubElement(meta, "creator")

    creator.text = annot.creator

    creationdate = lxml.etree.SubElement(meta, "created")

    creationdate.text = str(annot.creation_date)

    updatedate = lxml.etree.SubElement(meta, "modified")

    updatedate.text = str(annot.update_date)

    #return doc

    return HttpResponse(lxml.etree.tostring(doc, pretty_print=True), mimetype="text/xml;charset=utf-8")

## Deletes an annotation (from its id)

## Returns an empty xml-structured annotation

#@login_required

def delete_annotation(request, id):

    try:

        annot = Annotation.objects.get(external_id=request.POST["id"])

        annot.delete()

    #except Annotation.DoesNotExist:

    except:

        raise Http404

    doc=create_empty_annotation()

    #return doc

    return HttpResponse(lxml.etree.tostring(doc, pretty_print=True), mimetype="text/xml;charset=utf-8")

## Updates the content of an annotation

## Returns the xml-structured updated annotation

#@login_required

def update_annotation(request, content, id):

    try:

        annot = Annotation.objects.get(external_id=request.POST["id"])

    #except Annotation.DoesNotExist:

    except:

        raise Http404

    cont = base64.urlsafe_b64decode(request.POST["content"])

    doc = lxml.etree.fromstring(cont)

    uri = doc.xpath("/iri/text-annotation/uri/text()")

    if uri != [] and annot.uri != uri[0]:

        annot.uri = unicode(uri[0])

    tags = []

    for tag in doc.xpath("/iri/text-annotation/tags/tag"):

        tags.append(unicode(tag.text))

    if annot.tags is not None:

        if type(annot.tags) is unicode:

            annot.tags = eval(annot.tags)

        tags += annot.tags

    tags = normalize_tags(tags)

    annot.tags=tags

    title = doc.xpath("/iri/text-annotation/content/title/text()")

    if title != [] and annot.title != title[0]:

        annot.title = unicode(title[0])

    desc = doc.xpath("/iri/text-annotation/content/description/text()")

    if desc != [] and annot.description != desc[0]:

        annot.description = unicode(desc[0])

    text = doc.xpath("/iri/text-annotation/content/text/text()")

    if text != [] and annot.text != text[0]:

        annot.text = unicode(text[0])

    color = doc.xpath("/iri/text-annotation/content/color/text()")

    if color != [] and annot.color != color[0]:

        annot.color = unicode(color[0])

    contributor = doc.xpath("/iri/text-annotation/meta/contributor/text()")

    if contributor != [] and annot.contributor != contributor[0]:

        annot.contributor = unicode(contributor[0])

    update_date = doc.xpath("/iri/text-annotation/meta/modified/text()")

    if update_date != [] and annot.update_date != update_date[0]:

        annot.update_date = unicode(update_date[0])

    annot.save()

    return get_annotation(id)