from django.db import models
from django.dispatch import dispatcher
from django.db.models import signals
from django.contrib.auth.models import User, AnonymousUser
from bn_django.photos.models import Photo

class SubJournal(models.Model):
    name = models.CharField("full title", blank=False,max_length=196)
    date = models.DateField("date started", auto_now_add=True)
    slug = models.SlugField()
    description = models.TextField("description of content",blank=True)

    class Meta:
        get_latest_by = 'date'
        ordering = ['-date']

class JournalCommon(models.Model):
    author = User("User who created this") 
    date = models.DateTimeField("associated day", auto_now=True)
    last_edited = models.DateField("day last edited", auto_now_add=True)
    subjournal = models.ForeignKey(SubJournal,blank=True,null=True)
    defunct = models.BooleanField("is this entry all around done with?",default=False,blank=False)
    private = models.BooleanField("is this entry for validated users only?",default=False,blank=False)

    class Meta:
        abstract = True
        get_latest_by = 'date'
        ordering = ['-date']

class Entry(JournalCommon):
    html_content = models.TextField("html format content", blank=False)
    title = models.CharField("entry title", max_length=384)
    slug = models.SlugField()

    def get_absolute_url(self):
        return "/journal/%s/"%self.slug

class MicroEntry(JournalCommon):
    html_content = models.TextField("html format content", blank=False)
    text_content = models.TextField("text version of content", blank=True,null=True)

class Artifact(JournalCommon):
    html_caption = models.TextField("html format caption", blank=False)
    text_caption = models.TextField("text format caption", blank=True,null=True)
    entry = models.ForeignKey(Entry, blank=True)
    title = models.CharField("title of the artifact", max_length=256, blank=True)

    class Meta:
        abstract = True

class VideoArtifact(Artifact):
    codec = models.CharField("what codec/format the video is", max_length=384)
    filepath = models.FileField(upload_to="artifacts/%Y/%m/")
    external_url = models.URLField("external representation to reduce bandwidth (youtube, etc)", blank=True)

class CodeArtifact(Artifact):
    code = models.TextField("raw source code", blank=False)
    language = models.CharField("what programming language", max_length=160, \
        blank=True)

class LinkArtifact(Artifact):
    url = models.URLField("external link to something wonderful!", blank=True)

class ImageArtifact(Artifact,Photo):
    """Multiply inherets from the photo app
    """
    pass

def build_display_images(sender, instance, signal, *args, **kwargs):
    """Simple hook for save-after trigger
    """
    instance.build_display_images()
def delete_thumbnails(sender, instance, signal, *args, **kwargs):
    """Simple hook for pre-delete trigger.
    """
    instance.delete_thumbnails()

signals.post_save.connect(build_display_images, sender=ImageArtifact)
signals.pre_delete.connect(delete_thumbnails, sender=ImageArtifact)

from django.contrib import admin

admin.site.register(Entry)
admin.site.register(MicroEntry)
admin.site.register(SubJournal)
admin.site.register(Artifact)
admin.site.register(LinkArtifact)
admin.site.register(CodeArtifact)
admin.site.register(VideoArtifact)
admin.site.register(ImageArtifact)