# -*- coding:utf-8 -*-
from __future__ import absolute_import, unicode_literals

from django.db import models
from django.utils.encoding import python_2_unicode_compatible


@python_2_unicode_compatible
class Genre(models.Model):
    title = models.CharField(max_length=50)

    def __str__(self):
        return self.title


@python_2_unicode_compatible
class Artist(models.Model):
    title = models.CharField(max_length=50)
    genres = models.ManyToManyField(Genre)

    def __str__(self):
        return self.title


@python_2_unicode_compatible
class Album(models.Model):
    title = models.CharField(max_length=255)
    artist = models.ForeignKey(Artist)

    def __str__(self):
        return self.title


@python_2_unicode_compatible
class Song(models.Model):
    title = models.CharField(max_length=255)
    album = models.ForeignKey(Album, blank=True, null=True)
    artist = models.ForeignKey(Artist)
    genres = models.ManyToManyField(Genre, blank=True, null=True)

    def __str__(self):
        return self.title