"""
Отладочные view для суперюзеров.
Для мониторинга работы системы инвентаризации.
"""
from django.contrib.auth.decorators import login_required, user_passes_test
from django.shortcuts import render
from django.db.models import Q, Sum, Count
from inventory.models import StockBatch, Stock, Reservation, Sale, SaleBatchAllocation
from orders.models import Order
from products.models import Product
from inventory.models import Warehouse


def is_superuser(user):
    """Проверка что пользователь - суперюзер."""
    return user.is_superuser


@login_required
@user_passes_test(is_superuser)
def debug_inventory_page(request):
    """
    Отладочная страница для суперюзеров.
    Показывает полную картину по инвентаризации: партии, остатки, резервы, продажи.
    """
    # Получаем параметры фильтров
    product_id = request.GET.get('product')
    order_number = request.GET.get('order')
    warehouse_id = request.GET.get('warehouse')

    # Базовые querysets
    stock_batches = StockBatch.objects.select_related('product', 'warehouse').order_by('-created_at')
    stocks = Stock.objects.select_related('product', 'warehouse').order_by('product__name')
    reservations = Reservation.objects.select_related(
        'product', 'warehouse', 'order_item__order'
    ).order_by('-reserved_at')
    sales = Sale.objects.select_related('product', 'warehouse', 'order').order_by('-date')
    allocations = SaleBatchAllocation.objects.select_related(
        'sale__product', 'batch'
    ).order_by('-id')
    orders = Order.objects.prefetch_related('items').order_by('-created_at')

    # Применяем фильтры
    if product_id:
        product = Product.objects.filter(id=product_id).first()
        stock_batches = stock_batches.filter(product_id=product_id)
        stocks = stocks.filter(product_id=product_id)
        reservations = reservations.filter(product_id=product_id)
        sales = sales.filter(product_id=product_id)
        allocations = allocations.filter(sale__product_id=product_id)
        orders = orders.filter(items__product_id=product_id).distinct()
    else:
        product = None

    if order_number:
        # Парсим номер заказа: "ORD-103" -> 103 или "103" -> 103
        try:
            # Если формат "ORD-XXX", извлекаем число
            if order_number.upper().startswith('ORD-'):
                order_num = int(order_number.upper().replace('ORD-', ''))
            else:
                # Просто число
                order_num = int(order_number)
            
            order = Order.objects.filter(order_number=order_num).first()
        except (ValueError, AttributeError):
            order = None
        
        if order:
            reservations = reservations.filter(order_item__order=order)
            sales = sales.filter(order=order)
            # Фильтруем товары по заказу
            product_ids = order.items.values_list('product_id', flat=True)
            stock_batches = stock_batches.filter(product_id__in=product_ids)
            stocks = stocks.filter(product_id__in=product_ids)
            allocations = allocations.filter(sale__order=order)
            # Фильтруем только этот заказ в таблице заказов
            orders = orders.filter(id=order.id)
    else:
        order = None

    if warehouse_id:
        warehouse = Warehouse.objects.filter(id=warehouse_id).first()
        stock_batches = stock_batches.filter(warehouse_id=warehouse_id)
        stocks = stocks.filter(warehouse_id=warehouse_id)
        reservations = reservations.filter(warehouse_id=warehouse_id)
        sales = sales.filter(warehouse_id=warehouse_id)
    else:
        warehouse = None

    # Ограничиваем количество записей для производительности
    stock_batches = stock_batches[:100]
    stocks = stocks[:100]
    reservations = reservations[:100]
    sales = sales[:100]
    allocations = allocations[:100]
    orders = orders[:50]

    # Списки для фильтров
    products = Product.objects.filter(archived_at__isnull=True).order_by('name')[:200]
    warehouses = Warehouse.objects.filter(is_active=True).order_by('name')

    context = {
        'stock_batches': stock_batches,
        'stocks': stocks,
        'reservations': reservations,
        'sales': sales,
        'allocations': allocations,
        'orders': orders,
        'products': products,
        'warehouses': warehouses,
        'selected_product': product,
        'selected_order': order,
        'selected_warehouse': warehouse,
        'product_id': product_id,
        'order_number': order_number,
        'warehouse_id': warehouse_id,
    }

    return render(request, 'inventory/debug_page.html', context)