from django.db import models
from django.utils import timezone

from dynamic_preferences.registries import global_preferences_registry


radio_settings = global_preferences_registry.manager()


class RequestManager(models.Manager):
    def get_queryset(self):
        return super().get_queryset()

    def unplayed(self):
        return self.get_queryset().filter(played_at__isnull=True)

    def played(self):
        return self.get_queryset().filter(models.Q(queued_at__isnull=False) |
                                          models.Q(played_at__isnull=False))

    def not_queued(self):
        return self.get_queryset().filter(queued_at__isnull=True)

    def queued(self):
        return self.get_queryset().filter(queued_at__isnull=False)

    def new_requests(self):
        return self.get_queryset().filter(models.Q(queued_at__isnull=True) &
                                          models.Q(played_at__isnull=True))

    def get_played_requests(self, limit=None):
        if limit:
            return self.played()[0:limit]
        return self.played()

    def get_queued_requests(self, limit=None):
        if limit:
            return self.queued()[0:limit]
        return self.queued()

    def next_request(self):
        return self.new_requests().earliest('created_date')

    def should_play_jingle(self):
        if radio_settings['jingles__jingles_enabled']:
            function = radio_settings['jingles__jingles_function']
            if function == 'after_songs':
                limit = radio_settings['jingles__songs_per_jingle']
                queued_songs = self.get_queued_requests(limit)
                if not [j for j in queued_songs if j.song.is_jingle]:
                    return True
            elif function == 'after_time':
                now = timezone.now()
                delta = radio_settings['jingles__time_before_jingle']
                earlier = now - delta
                queued_songs = self.get_queued_requests().filter(
                    queued_at__range=(earlier, now)
                )
                if not [j for j in queued_songs if j.song.is_jingle]:
                    return True
        return False