import uuid

import django.core.urlresolvers

from django.conf import settings

from ldt.text.models import *

import urllib

import datetime

import lxml.etree

import base64

__BOOLEAN_DICT = {

    'false':False,

    'true':True,

    '0':False,

    '1':True,

    't': True,

    'f':False

}

def boolean_convert(bool):

    if bool is None:

        return False

    if bool is True or bool is False:

        return bool

    key = str(bool).lower()

    return __BOOLEAN_DICT.get(key, False)

def generate_uuid():

    return unicode(uuid.uuid1())

def normalize_tags(list):

    nlist=[]

    for tag in list:

        tag = tag.lower()

        nlist.append(tag)

    taglist = dict().fromkeys(nlist).keys()    

    return taglist

def create_empty_annotation():

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

    doc = lxml.etree.ElementTree(iri)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    return doc