from django.db import models
from django.utils import timezone
from .verbose_names import verbose_names
from django.core.validators import MinValueValidator, MaxValueValidator, ValidationError

class Song(models.Model):
    song_title = models.CharField(max_length=200, verbose_name=verbose_names['song_title'])
    release_year = models.CharField(max_length=4, verbose_name=verbose_names['release_year'])
    duration = models.DurationField(null=True, verbose_name=verbose_names['duration'])
    created_at = models.DateTimeField(default=timezone.now, verbose_name=verbose_names['created_at'], editable=False)
    modified_at = models.DateTimeField(auto_now=True, verbose_name='Data ostatniej modyfikacji')

    class Meta:
        verbose_name = 'Song'
        verbose_name_plural = 'Songs'
        unique_together = ('song_title', 'release_year')

    def __str__(self):
        return f"{self.song_title}, ({self.release_year})"

class Artist(models.Model):
    artist_name = models.CharField(max_length=255, verbose_name=verbose_names['artist_name'])
    songs = models.ManyToManyField(Song)

    class Meta:
        verbose_name = 'Artist'
        verbose_name_plural = 'Artists'

    def __str__(self):
        return self.artist_name

class MusicAlbum(models.Model):
    MEDIUM_TYPE = (
        ('audiocd', 'Audio CD'),
        ('audiocd_r', 'Audio CD-R'),
        ('sacd', 'Super Audio CD')
    )
    album_title = models.CharField(max_length=255, verbose_name=verbose_names['album_title'])
    medium_type = models.CharField(max_length=50, choices=MEDIUM_TYPE, verbose_name=verbose_names['medium_type'])
    disc_number = models.PositiveIntegerField(
        validators=[MinValueValidator(1),
                    MaxValueValidator(50)],verbose_name=verbose_names['disk_number']
    )
    total_disc = models.PositiveIntegerField(
        validators=[MinValueValidator(1),
                    MaxValueValidator(50)],verbose_name=verbose_names['total_disk']
    )
    songs = models.ManyToManyField(Song)

    def __str__(self):
        return f"{self.album_title} - Album {self.disc_number}"

    def clean(self):
        if self.disc_number and self.total_disc and self.disc_number > self.total_disc:
            raise ValidationError("Numer kolejny disku nie może być większy od całkowitej ilości dysków w albumie.")