from typing import Optional
from django.db import models
from django.db.models import F, ForeignKey
from django.utils.translation import gettext_lazy as _
from django.conf import settings
from django.utils.text import slugify
from filer.fields.image import FilerImageField
from .reference import BookReference

class HadisCollection(models.Model):
    title =  models.JSONField(default = list  , verbose_name=_('Title'))
    slug = models.SlugField(max_length=255, unique=True, verbose_name=_('slug'), blank=True)
    summary =  models.JSONField(default = list  , verbose_name=_('Summary'))
    status = models.BooleanField(default=True, verbose_name=_('status'))
    order = models.IntegerField(default=0, verbose_name=_('order'))
    thumbnail = FilerImageField(
        related_name="+",
        on_delete=models.CASCADE,
        help_text=_('thumbnail image'),
        null=True,
        blank=True,
        verbose_name=_('thumbnail')
    )
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))

    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 HadisCollection.objects.filter(slug=slug).exclude(pk=self.pk).exists():
                slug = f"{base_slug}-{counter}"
                counter += 1
            self.slug = slug
        super().save(*args, **kwargs)

    def __str__(self):
        return self.title[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_summary(self,lang):
        """
            Get translation for a specific language
        """
        
        if not self.summary or not isinstance(self.summary, list):
            return None

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

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

    class Meta:
        verbose_name = _('hadis collection')
        verbose_name_plural = _('hadis collections')
        ordering = ('order',)


class HadisInCollection(models.Model):
    hadis = models.ForeignKey('Hadis', on_delete=models.CASCADE, verbose_name=_('hadis'), related_name='collection_items')
    collection = models.ForeignKey(HadisCollection, on_delete=models.CASCADE, verbose_name=_('collection'), related_name='hadis_items')
    order = models.IntegerField(default=0, verbose_name=_('order'))
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))

    class Meta:
        verbose_name = _('hadis in collection')
        verbose_name_plural = _('hadis in collections')
        ordering = ('order',)
        unique_together = ('hadis', 'collection')

    def __str__(self):
        return f"{self.collection.title[0]['text']} - {self.hadis.number}"


class HadisTag(models.Model):
    title =  models.JSONField(default = list  , verbose_name=_('Title'))
    status = models.BooleanField(default=True, verbose_name=_('status'))
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('created at'))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_('updated at'))
    
    def __str__(self):
        return f"{self.title[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


class HadisStatus(models.Model):
    class ColorChoices(models.TextChoices):
        RED = 'red', _('Red')
        GREEN = 'green', _('Green')
        BLUE = 'blue', _('Blue')
        YELLOW = 'yellow', _('Yellow')
        ORANGE = 'orange', _('Orange')
        PURPLE = 'purple', _('Purple')
        GRAY = 'gray', _('Gray')

    title =  models.JSONField(default = list  , verbose_name=_('Title'))
    
    color = models.CharField(max_length=20, choices=ColorChoices.choices, verbose_name=_('color'))
    order = models.IntegerField(default=0, verbose_name=_('order'))

    def __str__(self):
        return self.title[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

    class Meta:
        verbose_name = _('hadis status')
        verbose_name_plural = _('hadis statuses')
        ordering = ('order',)




class Hadis(models.Model):
    category = models.ForeignKey("hadis.HadisCategory", on_delete=models.SET_NULL, null=True, blank=True, verbose_name=_('category'))
    number = models.PositiveIntegerField(verbose_name=_('number'), default=1)
    title_narrator =  models.JSONField(default = list  , verbose_name=_('Title Narrator'))
    title =  models.JSONField(default = list  , verbose_name=_('Title'))
    description =  models.JSONField(default = list  , verbose_name=_('Description'))
    
    text = models.TextField(verbose_name=_('text'))
    translation = models.JSONField(verbose_name=_('translation'), default=list)
    status = models.BooleanField(default=True, verbose_name=_('visibility'))

    hadis_status = models.ForeignKey(HadisStatus, on_delete=models.SET_NULL, null=True, blank=True, verbose_name=_('hadis status'))
    hadis_status_text = models.JSONField(default = list  , verbose_name=_('Status text'))
    address =  models.JSONField(default = list  , verbose_name=_('Address'))
    links = models.JSONField(verbose_name=_('links'), null=True, blank=True, default=dict)
    tags = models.ManyToManyField("HadisTag", related_name="hadis_overview", verbose_name=_('tags'), blank=True)

    share_link = models.CharField(max_length=255, verbose_name=_('share link'), null=True, blank=True)
    explanation =  models.JSONField(default = list  , verbose_name=_('Explanation'))

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

    def __str__(self):
        return f"{self.number} - {self.title[0]['text']}" if self.title else f"Hadis {self.number}"

    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_translation(self, lang):
        return self._get_json_field("translation" , lang)
    
    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_hadis_status_text(self, lang):
        return self._get_json_field("hadis_status_text" , lang)

    def get_address(self, lang):
        return self._get_json_field("address" , lang)
        
    def get_explanation(self, lang):
        return self._get_json_field("explanation" , lang)
        
        # """
        # Get translation for a specific language
        # """
        # if not self.translation or not isinstance(self.translation, list):
        #     return None

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

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

    def save(self, *args, **kwargs):
        # ساخت share_link قبل از ذخیره
        if not self.share_link:
            self.share_link = f"{settings.SITE_DOMAIN}/hadis/{self.id}"
        super().save(*args, **kwargs)

    class Meta:
        verbose_name = _('hadis')
        verbose_name_plural = _('hadises')
        ordering = ('category', 'number')



class HadisReference(models.Model):
    hadis = models.ForeignKey(
        Hadis,
        on_delete=models.CASCADE,
        verbose_name=_('hadis'),
        related_name='references'
    )
    book_reference = models.ForeignKey(
        BookReference,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        verbose_name=_('book reference'),
        related_name='hadis_references'
    )

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

    description =  models.JSONField(default = list  , verbose_name=_('Description'))

    class Meta:
        verbose_name = _('Hadis Reference')
        verbose_name_plural = _('Hadis References')
        # unique_together = ('hadis', 'book_reference')
    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.hadis.number}-{self.book_reference.title[0]["text"] if self.book_reference else "No Book Reference"}'

class ReferenceImage(models.Model):
    reference = models.ForeignKey(HadisReference,related_name = 'images', verbose_name="Hadis Reference", on_delete=models.CASCADE)
    thumbnail = models.ImageField(upload_to='hadis/reference_images/', null=True, blank=True, verbose_name=_('thumbnail'))
    priority = models.IntegerField(
        default=0, 
        verbose_name=_("Priority"),
        help_text=_("Priority of the image, lower values mean higher priority.")
    )


    class Meta:
        verbose_name = _('Reference Image')
        verbose_name_plural = _('Reference Images')

    def __str__(self):
        return f'{self.reference.title[0]["text"]}-{self.id}'
    
    def save(self, *args, **kwargs):
        if ReferenceImage.objects.filter(reference=self.reference, priority=self.priority).exists():
            ReferenceImage.objects.filter(
                reference=self.reference,
                priority__gte=self.priority
            ).update(priority=F('priority') + 1)

        super().save(*args, **kwargs)

class HadisCorrection(models.Model):
    hadis = models.ForeignKey(Hadis, verbose_name=_("hadis correction"), on_delete=models.CASCADE)
    title = models.JSONField(default = list  , verbose_name=_('Title'))
    description =models.JSONField(default = list  , verbose_name=_('Description'))
    translation = models.JSONField(verbose_name=_("translation"), default=list)
    created_at = models.DateTimeField(auto_now_add=True, verbose_name=_("created at"))
    updated_at = models.DateTimeField(auto_now=True, verbose_name=_("updated at"))
    share_link = models.CharField(max_length=255, verbose_name=_('share link'), null=True, blank=True)

    class Meta:
        verbose_name = _("Hadis Correction")
        verbose_name_plural = _("Hadis Corrections")
        ordering = ("-created_at",)

    def __str__(self):
        return f"{self.hadis.number} - {self.title[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_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 get_translation(self,lang):
        """
            Get title for a specific language
        """

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

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

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