from django.db import models
from django.db.models.signals import pre_delete
from django.dispatch import receiver
from .tasks import create_hls_tasks

# Create your models here.
VIDEO_GENDER = (
    (1, "male"),
    (2, "female"),
    (3, "anything goes"),
)

class Video(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    video_file = models.FileField(upload_to='videos/', null=True, verbose_name="")
    gender = models.PositiveSmallIntegerField(
      choices=VIDEO_GENDER
    )

    def __str__(self):
        return  str(self.video_file)

    def save(self, *args, **kwargs):
        is_new = self.pk is None
        if self.pk:
            try:
                old = type(self).objects.get(pk=self.pk)
                video_changed = old.video_file != self.video_file
            except type(self).DoesNotExist:
                video_changed = True
        else:
            video_changed = bool(self.video_file)

        super(Video, self).save(*args, **kwargs)

        if self.video_file and (is_new or video_changed):
            filename = self.video_file.name
            create_hls_tasks.delay(filename)

    
    
class ExerciseVideo(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    video_file = models.FileField(upload_to='videos/', null=True, verbose_name="")

    def save(self, *args, **kwargs):
        is_new = self.pk is None
        if self.pk:
            try:
                old = type(self).objects.get(pk=self.pk)
                video_changed = old.video_file != self.video_file
            except type(self).DoesNotExist:
                video_changed = True
        else:
            video_changed = bool(self.video_file)

        super(ExerciseVideo, self).save(*args, **kwargs)

        if self.video_file and (is_new or video_changed):
            filename = self.video_file.name
            create_hls_tasks.delay(filename)

@receiver(pre_delete, sender=ExerciseVideo)
def delete_exercise_video(sender, instance, using, **kwargs):
    video_file = instance.video_file
    video_file.delete(save=False)