from django.db import models

from .files import File


class Schedule(models.Model):
    starts = models.DateTimeField()
    ends = models.DateTimeField()
    file = models.ForeignKey(File, models.DO_NOTHING, blank=True, null=True)
    stream = models.ForeignKey("Webstream", models.DO_NOTHING, blank=True, null=True)
    clip_length = models.DurationField(blank=True, null=True)
    fade_in = models.TimeField(blank=True, null=True)
    fade_out = models.TimeField(blank=True, null=True)
    cue_in = models.DurationField()
    cue_out = models.DurationField()
    media_item_played = models.BooleanField(blank=True, null=True)
    instance = models.ForeignKey("ShowInstance", models.DO_NOTHING)
    playout_status = models.SmallIntegerField()
    broadcasted = models.SmallIntegerField()
    position = models.IntegerField()

    def get_owner(self):
        return self.instance.get_owner()

    def get_cueout(self):
        """
        Returns a cueout that is based on the current show. Cueout of a specific
        item can potentially overrun the show that it is scheduled in. In that
        case, the cueout should be the end of the show. This prevents the next
        show having overlapping items playing.
        """
        if self.instance.ends < self.ends:
            return self.instance.ends - self.starts
        return self.cue_out

    def get_ends(self):
        """
        Returns an item end that is based on the current show. Ends of a
        specific item can potentially overrun the show that it is scheduled in.
        In that case, the end should be the end of the show. This prevents the
        next show having overlapping items playing.
        """
        if self.instance.ends < self.ends:
            return self.instance.ends
        return self.ends

    class Meta:
        managed = False
        db_table = "cc_schedule"
        permissions = [
            ("change_own_schedule", "Change the content on their shows"),
            ("delete_own_schedule", "Delete the content on their shows"),
        ]