# -*- coding: utf-8 -*-
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib import messages
from django.core.paginator import Paginator
from django.db.models import Q
from .models import Order, OrderItem
from .forms import OrderForm, OrderItemFormSet


def order_list(request):
    """Список всех заказов с фильтрацией и поиском"""
    orders = Order.objects.select_related('customer', 'delivery_address', 'pickup_shop').all()

    # Поиск
    search_query = request.GET.get('search', '')
    if search_query:
        orders = orders.filter(
            Q(order_number__icontains=search_query) |
            Q(customer__name__icontains=search_query) |
            Q(customer__phone__icontains=search_query) |
            Q(customer__email__icontains=search_query)
        )

    # Фильтр по статусу
    status_filter = request.GET.get('status', '')
    if status_filter:
        orders = orders.filter(status=status_filter)

    # Фильтр по типу доставки
    delivery_filter = request.GET.get('delivery_type', '')
    if delivery_filter == 'delivery':
        orders = orders.filter(is_delivery=True)
    elif delivery_filter == 'pickup':
        orders = orders.filter(is_delivery=False)

    # Сортировка
    orders = orders.order_by('-created_at')

    # Пагинация
    paginator = Paginator(orders, 25)
    page_number = request.GET.get('page')
    page_obj = paginator.get_page(page_number)

    context = {
        'page_obj': page_obj,
        'search_query': search_query,
        'status_filter': status_filter,
        'delivery_filter': delivery_filter,
        'status_choices': Order.STATUS_CHOICES,
    }

    return render(request, 'orders/order_list.html', context)


def order_detail(request, pk):
    """Детальная информация о заказе"""
    order = get_object_or_404(
        Order.objects.select_related('customer', 'delivery_address', 'pickup_shop', 'modified_by')
                     .prefetch_related('items__product', 'items__product_kit', 'payments__created_by'),
        pk=pk
    )

    context = {
        'order': order,
    }

    return render(request, 'orders/order_detail.html', context)


def order_create(request):
    """Создание нового заказа"""
    if request.method == 'POST':
        form = OrderForm(request.POST)
        formset = OrderItemFormSet(request.POST)

        if form.is_valid() and formset.is_valid():
            order = form.save(commit=False)
            order.save()

            # Сохраняем позиции заказа
            formset.instance = order
            formset.save()

            # Пересчитываем итоговую сумму
            order.calculate_total()
            order.save()

            messages.success(request, f'Заказ #{order.order_number} успешно создан!')
            return redirect('orders:order-detail', pk=order.pk)
        else:
            messages.error(request, 'Пожалуйста, исправьте ошибки в форме.')
    else:
        form = OrderForm()
        formset = OrderItemFormSet()

    context = {
        'form': form,
        'formset': formset,
        'title': 'Создание заказа',
        'button_text': 'Создать заказ',
    }

    return render(request, 'orders/order_form.html', context)


def order_update(request, pk):
    """Редактирование заказа"""
    order = get_object_or_404(Order, pk=pk)

    if request.method == 'POST':
        form = OrderForm(request.POST, instance=order)
        formset = OrderItemFormSet(request.POST, instance=order)

        if form.is_valid() and formset.is_valid():
            order = form.save()
            formset.save()

            # Пересчитываем итоговую сумму
            order.calculate_total()
            order.save()

            messages.success(request, f'Заказ #{order.order_number} успешно обновлен!')
            return redirect('orders:order-detail', pk=order.pk)
        else:
            messages.error(request, 'Пожалуйста, исправьте ошибки в форме.')
    else:
        form = OrderForm(instance=order)
        formset = OrderItemFormSet(instance=order)

    context = {
        'form': form,
        'formset': formset,
        'order': order,
        'title': f'Редактирование заказа #{order.order_number}',
        'button_text': 'Сохранить изменения',
    }

    return render(request, 'orders/order_form.html', context)


def order_delete(request, pk):
    """Удаление заказа с подтверждением"""
    order = get_object_or_404(Order, pk=pk)

    if request.method == 'POST':
        order_number = order.order_number
        order.delete()
        messages.success(request, f'Заказ #{order_number} успешно удален.')
        return redirect('orders:order-list')

    context = {
        'order': order,
    }

    return render(request, 'orders/order_confirm_delete.html', context)