import uuid

from django.contrib.auth.models import User
from django.db import models

from api.models import Project
from .managers import ExampleManager, ExampleStateManager


class Example(models.Model):
    objects = ExampleManager()

    uuid = models.UUIDField(default=uuid.uuid4, editable=False, db_index=True, unique=True)
    meta = models.JSONField(default=dict)
    filename = models.FileField(default='.', max_length=1024)
    project = models.ForeignKey(
        to=Project,
        on_delete=models.CASCADE,
        related_name='examples'
    )
    annotations_approved_by = models.ForeignKey(
        to=User,
        on_delete=models.SET_NULL,
        null=True,
        blank=True
    )
    text = models.TextField(null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
    updated_at = models.DateTimeField(auto_now=True)

    @property
    def comment_count(self):
        return Comment.objects.filter(example=self.id).count()

    @property
    def data(self):
        if self.project.is_text_project:
            return self.text
        else:
            return str(self.filename)

    class Meta:
        ordering = ['created_at']


class ExampleState(models.Model):
    objects = ExampleStateManager()
    example = models.ForeignKey(
        to=Example,
        on_delete=models.CASCADE,
        related_name='states'
    )
    confirmed_by = models.ForeignKey(
        to=User,
        on_delete=models.CASCADE
    )
    confirmed_at = models.DateTimeField(auto_now=True)

    class Meta:
        unique_together = (('example', 'confirmed_by'),)


class Comment(models.Model):
    text = models.TextField()
    example = models.ForeignKey(
        to=Example,
        on_delete=models.CASCADE,
        related_name='comments'
    )
    user = models.ForeignKey(
        to=User,
        on_delete=models.CASCADE,
        null=True
    )
    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
    updated_at = models.DateTimeField(auto_now=True)

    @property
    def username(self):
        return self.user.username

    class Meta:
        ordering = ['created_at']