# backend/apps/hadis/management/commands/seed_hadis_chains.py

import random
from django.core.management.base import BaseCommand
from django.db import transaction
from apps.hadis.models import Hadis, Transmitters, HadisTransmitter, NarratorLayer, TransmitterReliability

class Command(BaseCommand):
    help = 'Seeds random transmission chains (HadisTransmitter) for all existing Hadiths.'

    def handle(self, *args, **options):
        self.stdout.write(self.style.WARNING("Checking Hadiths without transmission chains..."))

        # دریافت تمام دیتاهای پایه
        hadiths = list(Hadis.objects.filter(transmitters__isnull=True).distinct())
        narrators = list(Transmitters.objects.all())
        layers = list(NarratorLayer.objects.all())
        reliabilities = list(TransmitterReliability.objects.all())

        # بررسی وجود دیتای کافی
        if not hadiths:
            self.stdout.write(self.style.SUCCESS("All Hadiths already have transmission chains! Nothing to seed."))
            return
            
        if len(narrators) < 4:
            self.stdout.write(self.style.ERROR("Not enough Transmitters found. Please add at least 4 narrators."))
            return

        self.stdout.write(f"Found {len(hadiths)} Hadiths without transmitters. Generating chains...")

        links_to_create = []

        # ساخت زنجیره‌ها
        for hadis in hadiths:
            hadis_layers = list(hadis.narrator_layers.all().order_by('number'))
            if not hadis_layers:
                layer1 = NarratorLayer.objects.create(
                    hadis=hadis,
                    number=1,
                    name=[{"language_code": "en", "text": "Primary Transmitters"}],
                    description=[{"language_code": "en", "text": "Primary layer of transmitters."}],
                    slug=f"hadis-{hadis.id}-l1-primary"
                )
                layer2 = NarratorLayer.objects.create(
                    hadis=hadis,
                    number=2,
                    name=[{"language_code": "en", "text": "Secondary Transmitters"}],
                    description=[{"language_code": "en", "text": "Secondary layer of transmitters."}],
                    slug=f"hadis-{hadis.id}-l2-secondary"
                )
                hadis_layers = [layer1, layer2]

            num_layers = len(hadis_layers)

            # هر حدیث بین 2 تا 3 لایه/زنجیره (Chain) داشته باشد
            num_chains = random.randint(2, 3)
            
            for chain_idx in range(num_chains):
                # هر زنجیره بین 4 تا 6 راوی داشته باشد
                num_narrators = random.randint(4, min(6, len(narrators)))
                
                # انتخاب رندوم چند راوی برای این زنجیره بدون تکرار
                chain_narrators = random.sample(narrators, num_narrators)
                
                for order_idx, narrator in enumerate(chain_narrators):
                    assigned_layer = hadis_layers[min(num_layers - 1, order_idx // 2)] if num_layers > 1 else hadis_layers[0]
                    random_status = random.choice(reliabilities) if reliabilities else None
                    
                    link = HadisTransmitter(
                        hadis=hadis,
                        transmitter=narrator,
                        chain_index=chain_idx,
                        order=order_idx, # ترتیب قرارگیری راوی در این زنجیره
                        narrator_layer=assigned_layer,
                        status=random_status,
                        is_gap=random.choice([True, False, False, False]) # احتمال کم برای گپ (انقطاع سند)
                    )
                    links_to_create.append(link)

        # ذخیره دسته‌جمعی (Bulk Create) برای پرفورمنس بسیار بالاتر
        with transaction.atomic():
            # برای جلوگیری از محدودیت حافظه، در دسته‌های 1000 تایی ذخیره می‌کنیم
            batch_size = 1000
            for i in range(0, len(links_to_create), batch_size):
                HadisTransmitter.objects.bulk_create(links_to_create[i:i + batch_size])

        self.stdout.write(
            self.style.SUCCESS(
                f"Successfully created {len(links_to_create)} random narrator links across {len(hadiths)} Hadiths!"
            )
        )