import uuid

from concurrency.fields import AutoIncVersionField

from django.conf import settings

from django.core.exceptions import ValidationError

from django.db import models

from django.utils.translation import ugettext_lazy as _

from .managers import MetacategoryManager, ProtocolManager

# Create your models here.

class Protocol(models.Model):

    ext_id = models.UUIDField(

        unique=True, default=uuid.uuid4, verbose_name=_('Model|ext_id'))

    owner = models.CharField(max_length=512, verbose_name=_('Protocol|owner'))

    app = models.ForeignKey(

        settings.AUTH_USER_MODEL,

        on_delete=models.CASCADE,

        null=True,

        blank=True

    )

    def last_revision(self):

        return self.revisions.first()

    objects = ProtocolManager()

class ProtocolRevision(models.Model):

    ext_id = models.UUIDField(

        unique=True, default=uuid.uuid4, verbose_name=_('Model|ext_id'))

    protocol = models.ForeignKey(Protocol, on_delete=models.CASCADE,

                                 related_name="revisions", verbose_name=_('ProtocolRevision|protocol'))

    version = AutoIncVersionField(verbose_name=_('Model|version'), db_index=True)

    title = models.CharField(max_length=512, null=True,

                             blank=True, verbose_name=_('ProtocolRevision|title'))

    description = models.TextField(

        null=True,

        blank=True,

        verbose_name=_('ProtocolRevision|description')

    )

    metacategories = models.ManyToManyField('protocols.MetacategoryRevision', related_name="protocols")

    class Meta:

        ordering = ['-version',]

class Metacategory(models.Model):

    objects = MetacategoryManager()

    ext_id = models.UUIDField(

        unique=True, default=uuid.uuid4, verbose_name=_('Model|ext_id'))

    app = models.ForeignKey(

        settings.AUTH_USER_MODEL,

        on_delete=models.SET_NULL,

        null=True,

        blank=True

    )

    label = models.CharField(max_length=512, verbose_name=_('Metacategory|label'))

    title = models.CharField(max_length=512, verbose_name=_('Metacategory|title'))

    description = models.TextField(

        null=True,

        blank=True,

        verbose_name=_('Metacategory|description')

    )

    color = models.CharField(max_length=18, verbose_name=_('Metacategory|color'))

    has_comment = models.BooleanField()

    is_default = models.BooleanField()

    def last_revision(self):

        return self.revisions.first()

class MetacategoryRevision(models.Model):

    ext_id = models.UUIDField(

        unique=True, default=uuid.uuid4, verbose_name=_('Model|ext_id'))

    version = AutoIncVersionField(verbose_name=_('Model|version'), db_index=True)

    # protocol = models.ForeignKey(ProtocolRevision, on_delete=models.CASCADE)

    base = models.ForeignKey(Metacategory, on_delete=models.CASCADE,

                             related_name="revisions", verbose_name=_('MetacategoryRevision|base'))

    label = models.CharField(max_length=512, verbose_name=_('Metacategory|label'))

    title = models.CharField(max_length=512, verbose_name=_('Metacategory|title'))

    description = models.TextField(

        null=True,

        blank=True,

        verbose_name=_('Metacategory|description')

    )

    color = models.CharField(max_length=18, verbose_name=_('Metacategory|color'))

    has_comment = models.BooleanField()

    class Meta:

        ordering = ['-version',]