from django.db import models
from django.urls import reverse

from datetime import timedelta
from json import loads

from .s3 import build_presigned_url


class Video(models.Model):
    id = models.CharField(max_length=11, primary_key=True)
    title = models.CharField(max_length=100)
    published = models.DateTimeField()
    description = models.TextField(blank=True, null=True)
    path = models.CharField(max_length=1024)
    thumbnail_path = models.CharField(max_length=1024)
    original_json = models.JSONField(blank=True, null=True)

    def get_video_url(self):
        return build_presigned_url(self.path)

    def get_thumbnail_url(self):
        return build_presigned_url(self.thumbnail_path, timedelta(minutes=5))

    def get_absolute_url(self):
        return reverse("video", kwargs={"pk": self.id})

    @property
    def tags(self):
        return loads(self.original_json)["tags"]

    def __str__(self):
        return self.title

class Playlist(models.Model):
    id = models.CharField(max_length=34, primary_key=True)
    title = models.CharField(max_length=100)
    videos = models.ManyToManyField(Video)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse("playlist", kwargs={"pk": self.id})