from django.db import models
from django.utils.translation import gettext_lazy as _
from django.utils.text import slugify


class BookReference(models.Model):
    """
    Model for hadis book references with detailed information
    This is different from library books - these are reference books for hadis
    """
    title = models.CharField(max_length=500, verbose_name=_('title'))
    description = models.TextField(verbose_name=_('description'), blank=True, null=True)
    language = models.CharField(max_length=100, verbose_name=_('language'), blank=True, null=True)
    isbn = models.CharField(max_length=100, verbose_name=_('ISBN'), blank=True, null=True)
    volume = models.CharField(max_length=100, verbose_name=_('volume'), blank=True, null=True)
    year_of_publication = models.CharField(max_length=50, verbose_name=_('year of publication'), blank=True, null=True)
    number_page = models.PositiveIntegerField(verbose_name=_('number of pages'), blank=True, null=True)
    slug = models.SlugField(max_length=255, verbose_name=_('slug'), blank=True,unique=True)
    publisher = models.TextField(verbose_name=_('publisher'),blank=True,null=True)
    rate = models.DecimalField(
        max_digits=3,
        decimal_places=2,
        verbose_name=_('rate'),
        blank=True,
        null=True,
        help_text=_('Rating from 0 to 5')
    )

    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))

    class Meta:
        verbose_name = _('Book Reference')
        verbose_name_plural = _('Book References')
        ordering = ('-created_at',)

    def __str__(self):
        return self.title

    def save(self, *args, **kwargs):
        if not self.slug:
            base_slug = slugify(self.title, allow_unicode=True)
            slug = base_slug
            counter = 1
            while BookReference.objects.filter(slug=slug).exclude(pk=self.pk).exists():
                slug = f"{base_slug}-{counter}"
                counter += 1
            self.slug = slug
        super().save(*args, **kwargs)

class BookReferenceImage(models.Model):
    """
    Model for book reference images - multiple images per book reference
    """
    book_reference = models.ForeignKey(
        BookReference,
        on_delete=models.CASCADE,
        related_name='images',
        verbose_name=_('book reference')
    )
    image = models.ImageField(upload_to='hadis/book_reference_images/', verbose_name=_('image'))
    order = models.PositiveIntegerField(default=0, verbose_name=_('order'))
    description = models.CharField(max_length=255, verbose_name=_('description'), blank=True, null=True)

    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))

    class Meta:
        verbose_name = _('Book Reference Image')
        verbose_name_plural = _('Book Reference Images')
        ordering = ['order', '-created_at']

    def __str__(self):
        return f"{self.book_reference.title} - Image {self.order}"


class BookAuthor(models.Model):
    """
    Model for book reference authors
    """
    name = models.CharField(max_length=255, verbose_name=_('name'))
    book_references = models.ManyToManyField(
        BookReference,
        related_name='authors',
        verbose_name=_('book references'),
        blank=True
    )

    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))

    class Meta:
        verbose_name = _('Book Author')
        verbose_name_plural = _('Book Authors')
        ordering = ['name']

    def __str__(self):
        return self.name


class BookAttribute(models.Model):
    """
    Model for book reference attributes - custom key-value pairs
    """
    title = models.CharField(max_length=255, verbose_name=_('title'))
    value = models.CharField(max_length=500, verbose_name=_('value'))
    book_reference = models.ForeignKey(
        BookReference,
        on_delete=models.CASCADE,
        related_name='attributes',
        verbose_name=_('book attribute'),
        default = None,
        null = True
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))

    class Meta:
        verbose_name = _('Book Attribute')
        verbose_name_plural = _('Book Attributes')
        ordering = ['title']

    def __str__(self):
        return f"{self.title}: {self.value}"