from django.db import models
from django.core.validators import MinValueValidator, ValidationError

# Create your models here.

GENRE_CHOICES = (
        ('Pop Music', 'Pop Music'),
        ("Jazz Music", "Jazz Music"),
        ("R&B Music", "R&B Music"),
        ("Rock Music", "Rock Music"),
        ("Country Music", "Country Music"),
        ("Dance Music", "Dance Music"),
        ("Hip Hop Music", "Hip Hop Music"),
        ("Other", "Other")
    )


def username_validator(value):
    for char in value:
        if not char.isdigit() and not char.isalpha() and not char == '_':
            raise ValidationError("Ensure this value contains only letters, numbers, and underscore.")


class ProfileModel(models.Model):
    USERNAME_MAX_LEN = 15
    USERNAME_MIN_LEN = 2

    username = models.CharField(
        verbose_name=' User Name',
        max_length=USERNAME_MAX_LEN,
        unique=True,
        null=False,
        blank=False,
        validators=[MinValueValidator(USERNAME_MIN_LEN), username_validator]
    )

    user_email = models.EmailField(
        verbose_name="Email",
        null=False,
        blank=False,
        unique=True,
    )

    age = models.PositiveIntegerField(
        verbose_name="Age",
        null=True,
        blank=True
    )


class AlbumModel(models.Model):
    ALBUM_MAX_LEN = 30
    ARTIST_MAX_LEN = 30
    GENRE_MAX_LEN = 30

    album = models.CharField(
        verbose_name='Album',
        max_length=ALBUM_MAX_LEN,
        unique=True,
        null=False,
        blank=False
    )

    artist = models.CharField(
        verbose_name='Artist',
        max_length=ARTIST_MAX_LEN,
        null=False,
        blank=False
    )

    genre = models.CharField(
        null=False,
        blank=False,
        verbose_name='Genre',
        max_length=GENRE_MAX_LEN,
        choices=GENRE_CHOICES
    )

    description = models.TextField(
        verbose_name='Description',
        null=True,
        blank=True
    )

    image_url = models.URLField(
        verbose_name='Image URL:',
        null=False,
        blank=False
    )

    price = models.FloatField(
        verbose_name='Price',
        null=False,
        blank=False,
        validators=[MinValueValidator(0.0)]
    )