'''

Created on Jul 17, 2014

Reworked in December, 2015

@author: tc, nd

'''

import uuid

from django.conf import settings

from django.db import models

from django.http import Http404

auth_user_model = getattr(settings, 'AUTH_USER_MODEL', 'auth.User')

class Workspace(models.Model):

    workspace_guid = models.CharField(max_length=1024, default=uuid.uuid4, unique=True, blank=False, null=False) # typically UUID

    title = models.CharField(max_length=1024, null=True)

    creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="workspace_creator")

    creation_date = models.DateTimeField(auto_now_add=True)

    @property

    def renkan_count(self):

        return Renkan.objects.filter(workspace_guid=self.workspace_guid).count()

    class Meta:

        app_label = 'renkanmanager'

        permissions = (

            ('view_workspace', 'Can view workspace'),

        )

class Renkan(models.Model):

    renkan_guid = models.CharField(max_length=256, default=uuid.uuid4, unique=True, blank=False, null=False) # typically UUID

    workspace_guid = models.CharField(max_length=256, blank=True, null=True)

    current_revision_guid = models.CharField(max_length=256, blank=True, null=True)

    source_revision_guid = models.CharField(max_length=256, blank=True, null=True)

    creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="renkan_creator")

    creation_date = models.DateTimeField(auto_now_add=True)

    state = models.IntegerField(default=1)

    @property

    def revision_count(self):

        return Revision.objects.filter(parent_renkan_guid=self.renkan_guid).count()

    @property

    def is_copy(self):

        return bool(self.source_revision_guid)

    # Current revision title

    @property

    def title(self):

        current_revision = Revision.objects.get(revision_guid = self.current_revision_guid)

        return current_revision.title

    # Current revision content

    @property

    def content(self):

        current_revision = Revision.objects.get(revision_guid = self.current_revision_guid)

        return current_revision.content

    class Meta:

        app_label = 'renkanmanager'

        permissions = (

            ('view_renkan', 'Can view renkan'),

        )

class Revision(models.Model):

    revision_guid = models.CharField(max_length=256, default=uuid.uuid4, unique=True) # typically UUID

    parent_renkan_guid = models.CharField(max_length=256)

    title = models.CharField(max_length=1024, null=True, blank=True)

    content = models.TextField(blank=True, null=True)

    creator = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="revision_creator")

    last_updated_by = models.ForeignKey(auth_user_model, blank=True, null=True, related_name="revision_last_updated_by")

    creation_date = models.DateTimeField(auto_now_add=True)

    modification_date = models.DateTimeField(auto_now=True)

    @property

    def is_current_revision(self):

        try:

            parent_project = Renkan.objects.get(renkan_guid=self.parent_renkan_guid)

        except Renkan.DoesNotExist: # SHOULD NOT HAPPEN!

            raise Http404

        return parent_project.current_revision_guid == self.revision_guid

    class Meta:

        app_label = 'renkanmanager'

        permissions = (

            ('view_revision', 'Can view revision'),

        )