#! -*- encoding: utf-8 -*-
from datetime import datetime
from django.db import models
from djangofr.tagging.fields import TagField
from djangofr.tagging.models import Tag

LANGUAGES = (
    ('Fr', 'Francais'),
    ('En', 'Anglais'),
)

class LinkManager(models.Manager):
    def get_query_set(self):
        """ Retrieve only published links. """
        qs = super(LinkManager, self).get_query_set()
        return qs.filter(is_online=True)


class Link(models.Model):
    title = models.CharField('Titre', max_length=200)
    slug = models.SlugField(
        'Ancre', prepopulate_from=('title',),
        help_text='Pour un accès direct sur la page des liens.'
    )
    url = models.URLField(
        'Adresse',
        help_text='Lien vers la ressource.'
    )
    lang = models.CharField('Langue du lien', max_length=2, choices=LANGUAGES, default='En')
    comment = models.TextField('Commentaire', help_text='Petit paragraphe explicatif')

    submission_date = models.DateTimeField('Date de mise en ligne par l\'auteur')

    is_online = models.BooleanField('En ligne', default=False)
    related_tags = TagField(help_text='Tags séparés par des virgules ou des espaces')

    class Admin:
        list_display = ('title', 'url', 'is_online')
        list_filter = ('submission_date', 'is_online')
        search_fields = ('title', 'comment')
        date_hierarchy = 'submission_date'

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        return "/liens/%s/#%s" % (self.submission_date.strftime("%Y/%m"), self.slug)

    def _get_tags(self):
        return Tag.objects.get_for_object(self)

    def _set_tags(self, tag_list):
        return Tag.objects.update_tags(self, tag_list)

    tags = property(_get_tags, _set_tags)

    objects = models.Manager()
    published = LinkManager()