from django.db import models
from django.urls import reverse

from quotes.localmodels import HTMLField

# Create your models here.
class Tag(models.Model):
    tag = models.CharField(max_length=100, unique=True)

    def __unicode__(self):
        return self.tag

    def get_absolute_url(self):
        return reverse('quotes_beta:tags', args=[str(self.id)])

class Context(models.Model):
    creation_date = models.DateTimeField(auto_now_add=True)
    last_modification = models.DateTimeField(auto_now=True)

    name = models.CharField(max_length=100,
                            unique=True)

    date = models.DateField(blank=True, null=True,
                            help_text="Date of the quote")

    notes = HTMLField(blank=True, help_text= \
                      "Notes about the entry; may be left blank. Displayed \
                      on the public pages")
    pvt_notes = HTMLField(blank=True, help_text= \
                          "Notes about the entry; not displayed on \
                          the public interface")

    tags = models.ManyToManyField(Tag, blank=True,
                                  help_text='Not implemented yet')

    nb_display = models.BigIntegerField(default=0)
    def incr_display(self):
        self.nb_display = models.F('nb_display') + 1
        self.save()

    def add_parent(self, parent):
        descendants = self.childs + self
        ascendants = parent + parent.parents
        for descendant in descendants:
            for ascendant in ascendants:
                Link.objects.create(child=descendant, parent=ascendant)

    def __unicode__(self):
        return self.name

    class Meta:
        ordering = ['name']

class Person(Context):
    birth_date = models.DateField(blank=True, null=True,
                                  help_text="Date of birth")
    death_date = models.DateField(blank=True, null=True,
                                  help_text="Date of death (leave blank \
                                  if still alive!)")

    def get_absolute_url(self):
        return reverse('quotes_beta:person', args=[str(self.id)])

class Book(Context):
    def get_absolute_url(self):
        return reverse('quotes_beta:work', args=[str(self.id)])

class Film(Context):
    def get_absolute_url(self):
        return reverse('quotes_beta:work', args=[str(self.id)])

class Quote(Context):
    text = HTMLField()

    def __unicode__(self):
        return self.work.author.name + ": " + self.text

    def get_absolute_url(self):
        return reverse('quotes_beta:onequote', args=[str(self.id)])

    # class Meta(Context.Meta):
    #     ordering = ['-pk']

class Link(models.Model):
    child = models.ForeignKey(Context, related_name='parents')
    parent = models.ForeignKey(Context, related_name='childs')
    relation_type = models.CharField(max_length=100)