Dovodi_Backend/apps/hadis/models/reference.py

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


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.JSONField(default = list  , verbose_name=_('Title'))
    description =  models.JSONField(default = list  , verbose_name=_('Description'))
    language =  models.JSONField(default = list  , verbose_name=_('Language'))
    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.JSONField(default = list  , verbose_name=_('Publisher'))
    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[0]['text']

    def _get_json_field(self, field_name: str, lang: Optional[str]=None , fallback: str = "en"):
        """
        Generic getter for JSONField in our [{text, language_code}] format.
        Usage: self._get_json_field('title', 'fa')
        """
        if lang is None:
            lang = fallback

        value = getattr(self, field_name, None)
        if not value or not isinstance(value, list):
            return None

        # 1) exact language
        for item in value:
            if isinstance(item, dict) and item.get("language_code") == lang:
                return item.get("text", "")

        # 2) fallback language
        if fallback and fallback != lang:
            for item in value:
                if isinstance(item, dict) and item.get("language_code") == fallback:
                    return item.get("text", "")

        # 3) first available
        item = value[0]
        print(item)
        return item.get("text", "") if isinstance(item, dict) else None

    def get_title(self,lang):
        return self._get_json_field("title" , lang)

    def get_description(self, lang):
        return self._get_json_field("description" , lang)

    
    def get_publisher(self, lang):
        return self._get_json_field("publisher" , lang)

    def get_language(self, lang):
        return self._get_json_field("language" , lang)


    def save(self, *args, **kwargs):
        if not self.slug:
            base_slug = slugify(self.title[0]['text'], 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.JSONField(default = list  , verbose_name=_('Description'))

    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 get_description(self,lang):
        """
            Get title for a specific language
        """

        if not self.description or not isinstance(self.description, list):
            return None

        for tr in self.description:
            if isinstance(tr, dict) and tr.get('language_code') == lang:
                return tr.get('text', '')

        for tr in self.description:
            if isinstance(tr, dict) and tr.get('language_code') == 'en':
                return tr.get('text', '')
        return None

    def __str__(self):
        return f"{self.book_reference.title[0]['text']} - Image {self.order}"


class BookAuthor(models.Model):
    """
    Model for book reference authors
    """
    name =  models.JSONField(default = list  , 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[0]['text']

    def get_name(self,lang):
        """
            Get title for a specific language
        """

        if not self.name or not isinstance(self.name, list):
            return None

        for tr in self.name:
            if isinstance(tr, dict) and tr.get('language_code') == lang:
                return tr.get('text', '')

        for tr in self.name:
            if isinstance(tr, dict) and tr.get('language_code') == 'en':
                return tr.get('text', '')
        return None


class BookAttribute(models.Model):
    """
    Model for book reference attributes - custom key-value pairs
    """
    title =  models.JSONField(default = list  , verbose_name=_('Title'))
    value =  models.JSONField(default = list  , 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[0]['text']}: {self.value[0]['text']}"

    def get_title(self,lang):
        """
            Get title for a specific language
        """

        if not self.title or not isinstance(self.title, list):
            return None

        for tr in self.title:
            if isinstance(tr, dict) and tr.get('language_code') == lang:
                return tr.get('text', '')

        for tr in self.title:
            if isinstance(tr, dict) and tr.get('language_code') == 'en':
                return tr.get('text', '')
        return None

    def get_value(self,lang):
        """
            Get title for a specific language
        """

        if not self.value or not isinstance(self.value, list):
            return None

        for tr in self.value:
            if isinstance(tr, dict) and tr.get('language_code') == lang:
                return tr.get('text', '')

        for tr in self.value:
            if isinstance(tr, dict) and tr.get('language_code') == 'en':
                return tr.get('text', '')
        return None