from django.forms import ValidationError
from django.utils import timezone

from dynamic_preferences.types import (
    BooleanPreference, ChoicePreference, DurationPreference,
    FloatPreference, IntegerPreference
)
from dynamic_preferences.preferences import Section
from dynamic_preferences.registries import global_preferences_registry


general = Section('general')
jingles = Section('jingles')
replay = Section('replay')


@global_preferences_registry.register
class MaxSongRequests(IntegerPreference):
    section = general
    name = 'max_song_requests'
    help_text = (
        'The maximum amount of requests a user can have queued at any given '
        'time. This restriction does not apply to users who are designated '
        'as staff.'
    )
    default = 5
    required = True

    def validate(self, value):
        if value < 0:
            raise ValidationError('Must be greater than 0.')


@global_preferences_registry.register
class JinglesEnabled(BooleanPreference):
    section = general
    name = 'jingles_enabled'
    help_text = 'Enable jingle functionality for the radio.'
    default = False
    required = False


@global_preferences_registry.register
class JinglesFunction(ChoicePreference):
    section = jingles
    name = 'jingles_function'
    help_text = 'The function to determine when jingles are played.'
    choices = [
        ('after_songs', 'After so many songs are played'),
        ('after_time', 'After so much time has passed'),
    ]
    default = 'after_songs'
    required = True


@global_preferences_registry.register
class SongsPerJingle(IntegerPreference):
    section = jingles
    name = 'songs_per_jingle'
    help_text = 'The amount of songs that will be played between jingles.'
    default = 30
    required = True

    def validate(self, value):
        if value < 0:
            raise ValidationError('Must be greater than 0.')


@global_preferences_registry.register
class TimeBeforeJingle(DurationPreference):
    section = jingles
    name = 'time_before_jingle'
    help_text = 'The amount of time before a jingle is played.'
    default = timezone.timedelta(hours=1)
    required = True


@global_preferences_registry.register
class ReplayRatio(FloatPreference):
    section = replay
    name = 'replay_ratio'
    help_text = (
        'This defines how long before a song can be played/requested again '
        'once it\'s been played. The ratio is based on the total song length '
        'of all the enabled, requestable songs in the radio playlist.\n\n'
        'Example: If the total song length of the radio playlist is 432000 '
        'seconds (5 days), then a ratio of 0.75 will mean that a song cannot '
        'be played again for 324000 seconds '
        '(0.75 * 432000 = 324000 seconds = 3 days, 18 hours).'
    )
    default = float(0.75)
    required = True

    def validate(self, value):
        if value < 0.0 or value > 1.0:
            raise ValidationError('Must be between 0.0 and 1.0, inclusive.')


@global_preferences_registry.register
class MinRatingsForVariance(IntegerPreference):
    section = replay
    name = 'min_ratings_for_variance'
    help_text = (
        'The minimum amount of ratings for the rating variance to take effect '
        'on the replay ratios.'
    )
    default = 5
    required = True

    def validate(self, value):
        if value < 0:
            raise ValidationError('Must be greater than 0.')


@global_preferences_registry.register
class RatingVarianceRatio(FloatPreference):
    section = replay
    name = 'rating_variance_ratio'
    help_text = (
        'The range in which the replay ratio can be adjusted due to profile '
        'ratings.'
    )
    default = float(0.20)
    required = True

    def validate(self, value):
        if value < 0.0 or value > 1.0:
            raise ValidationError('Must be between 0.0 and 1.0, inclusive.')