import os
import random
from django.core.management.base import BaseCommand
from django.core.files import File
from django.core.files.base import ContentFile
from django.conf import settings
from django.db import transaction

# REMEMBER: Change 'your_app' to your actual app name
from apps.hadis.models.hadis import Hadis, HadisReference, ReferenceImage
from apps.hadis.models.reference import BookReference

class Command(BaseCommand):
    help = 'Seeds HadisReferences ensuring every Book has 2+ hadiths AND every Hadith has 1+ reference.'

    def handle(self, *args, **kwargs):
        self.stdout.write(self.style.WARNING('--- Starting Cleanup ---'))

        # 1. DELETE PREVIOUS DATA
        deleted_imgs_count, _ = ReferenceImage.objects.all().delete()
        deleted_refs_count, _ = HadisReference.objects.all().delete()

        self.stdout.write(self.style.SUCCESS(f'Deleted {deleted_imgs_count} old ReferenceImages.'))
        self.stdout.write(self.style.SUCCESS(f'Deleted {deleted_refs_count} old HadisReferences.'))
        self.stdout.write('------------------------')

        # 2. Setup Paths
        self.base_image_path = os.path.join(settings.BASE_DIR, 'seeds', 'images')
        self.image_files = [f'ref{i}.png' for i in range(1, 5)] 

        # Verify images
        for img_name in self.image_files:
            full_path = os.path.join(self.base_image_path, img_name)
            if not os.path.exists(full_path):
                self.stdout.write(self.style.ERROR(f'CRITICAL ERROR: Image not found at {full_path}'))
                return

        # 3. Fetch Data
        books = list(BookReference.objects.all())
        hadiths = list(Hadis.objects.all())

        if not books or not hadiths:
            self.stdout.write(self.style.ERROR('Missing Books or Hadiths in DB.'))
            return

        self.stdout.write('--- Starting Seeding ---')
        
        self.counter_refs = 0
        self.counter_imgs = 0
        
        # Track which Hadith IDs have been covered
        covered_hadith_ids = set()

        # ==========================================
        # PHASE 1: Satisfy Book Constraint
        # "Each book must relate to at least 2 hadith"
        # ==========================================
        self.stdout.write("Phase 1: Linking Books to Hadiths...")
        
        for book in books:
            # Pick 2 random hadiths for this book
            # We use distinct logic if we want to ensure we don't pick the same one twice for one book
            selected_hadiths = random.sample(hadiths, k=min(len(hadiths), 2))

            for hadis_obj in selected_hadiths:
                self._create_reference_chain(hadis_obj, book)
                covered_hadith_ids.add(hadis_obj.id)

        # ==========================================
        # PHASE 2: Satisfy Hadith Constraint
        # "Each hadith must have a hadith reference object"
        # ==========================================
        self.stdout.write("Phase 2: Checking for orphan Hadiths...")

        for hadis_obj in hadiths:
            if hadis_obj.id not in covered_hadith_ids:
                # This hadith was skipped in Phase 1. 
                # We must assign it to a Book (Reference).
                # Pick a random book to associate with
                random_book = random.choice(books)
                
                self._create_reference_chain(hadis_obj, random_book)
                covered_hadith_ids.add(hadis_obj.id)

        self.stdout.write(self.style.SUCCESS(
            f'DONE: Created {self.counter_refs} HadisReferences (covering {len(covered_hadith_ids)} Hadiths) and {self.counter_imgs} Images.'
        ))

    def _create_reference_chain(self, hadis_obj, book_obj):
        """
        Helper to create the Reference and its Images
        """
        # Create the HadisReference
        hadis_ref = HadisReference.objects.create(
            hadis=hadis_obj,
            book_reference=book_obj,
            description=[
                {'language_code': 'en', 'text': f'Reference for {book_obj.title[0].get("text", "Book")} - Hadith {hadis_obj.number}'},
                {'language_code': 'ar', 'text': 'وصف مرجعي'}
            ]
        )
        self.counter_refs += 1
        
        # Create Images for this Reference
        self._create_images_for_ref(hadis_ref)

    def _create_images_for_ref(self, hadis_ref):
        """
        Helper to create 2 images for a specific HadisReference
        """
        selected_images = random.sample(self.image_files, 2)

        for priority_index, img_name in enumerate(selected_images):
            img_path = os.path.join(self.base_image_path, img_name)
            
            # Read file safely
            with open(img_path, 'rb') as f:
                file_content = f.read()

            ref_img = ReferenceImage(
                reference=hadis_ref,
                priority=priority_index 
            )

            # Assign content without auto-saving
            ref_img.thumbnail.save(img_name, ContentFile(file_content), save=False)

            try:
                # Explicit save to handle your custom model logic / signals
                ref_img.save()
                self.counter_imgs += 1
            except Exception as e:
                self.stdout.write(self.style.ERROR(f"Failed to save image {img_name}: {e}"))