from django.db import models
from django.contrib.auth import get_user_model

User = get_user_model()

class Bookmark(models.Model):
    """
    Bookmark model for different services like library, podcast, hadith, and video.
    """
    
    class ServiceChoices(models.TextChoices):
        LIBRARY = 'library', 'Library'
        PODCAST = 'podcast', 'Podcast'
        HADITH = 'hadith', 'Hadith'
        VIDEO = 'video', 'Video'
        VIDEO_PLAYLIST = 'video_playlist', 'Video Playlist'
        ARTICLE = 'article', 'Article'
    
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='bookmarks', verbose_name='User')
    service = models.CharField(max_length=20, choices=ServiceChoices.choices, verbose_name='Service')
    content_id = models.PositiveIntegerField(verbose_name='Content ID')
    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')
    
    class Meta:
        verbose_name = 'Bookmark'
        verbose_name_plural = 'Bookmarks'
        unique_together = ('user', 'service', 'content_id')
        
    def __str__(self):
        return f"{self.user.username} - {self.get_service_display()} - {self.content_id}"
    
    @classmethod
    def is_bookmarked(cls, user, service, content_id):
        """
        Check if a specific content is bookmarked by the user.
        
        Args:
            user: User instance
            service: Service name (library, podcast, hadith, video)
            content_id: ID of the content
            
        Returns:
            Boolean indicating if the content is bookmarked
        """
        return cls.objects.filter(
            user=user,
            service=service,
            content_id=content_id,
            status=True
        ).exists()
        
    @classmethod
    def validate_content_exists(cls, service, content_id):
        """
        Validate if content with the given ID exists in the specified service.
        
        Args:
            service: Service name (library, podcast, hadith, video)
            content_id: ID of the content to validate
            
        Returns:
            Boolean indicating if the content exists
        """
        if service == cls.ServiceChoices.LIBRARY:
            from apps.library.models import Book
            return Book.objects.filter(id=content_id).exists()
        elif service == cls.ServiceChoices.PODCAST:
            from apps.podcast.models import Podcast
            return Podcast.objects.filter(id=content_id).exists()
        elif service == cls.ServiceChoices.HADITH:
            from apps.hadith.models import Hadith
            return Hadith.objects.filter(id=content_id).exists()
        elif service == cls.ServiceChoices.VIDEO:
            from apps.video.models import Video
            return Video.objects.filter(id=content_id).exists()
        elif service == cls.ServiceChoices.VIDEO_PLAYLIST:
            from apps.video.models import VideoPlaylist
            return VideoPlaylist.objects.filter(id=content_id).exists()
        elif service == cls.ServiceChoices.ARTICLE:
            from apps.article.models import Article
            return Article.objects.filter(id=content_id).exists()
        return False