from functools import reduce

from django.conf import settings
from django.urls import reverse_lazy
from django.utils.translation import ugettext_lazy as _
from django.views.generic import ListView, DetailView

# from cart.forms import CartAddInlineForm
from core.utils import parse_path
from .forms import (ProductSortForm)
from .models import (Product,ProductCategory)


class ProductDetailView(DetailView):
    http_method_names = ('get',)
    model = Product
    pk_url_kwarg = None
    slug_url_kwarg = 'path'
    context_object_name = 'product'
    template_name = 'products/product_detail.html'

    def dispatch(self, request, *args, **kwargs):
        if self.kwargs.get(self.slug_url_kwarg):
            slug_url_kwarg_val = self.kwargs.pop(self.slug_url_kwarg)
            slug_url_kwarg_val = parse_path(slug_url_kwarg_val)
            self.kwargs[self.slug_url_kwarg] = slug_url_kwarg_val
        return super().dispatch(request, *args, **kwargs)

    def get_slug_field(self):
        return 'slug'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['title'] = self.object.name
        return context


class ProductListView(ListView):
    http_method_names = ('get',)
    model = Product
    template_name = 'products/product_list.html'
    context_object_name = 'products'
    paginate_by = settings.DEFAULT_PAGE_AMOUNT
    title = _('Каталог')

    def filter_products(self,qs):
        if self.kwargs.get('path'):
            category_intance = parse_path(self.kwargs.get('path'))
            cat_qs = ProductCategory.objects.filter(slug__exact=category_intance).first()
            qs = qs.filter(parent__in=cat_qs.get_descendants(include_self=True))
        if self.request.GET.get('name'):
            qs = qs.filter(name__icontains=self.request.GET.get('name'))
        if self.request.GET.get('manufacturer'):
            qs = qs.filter(manufacturer__slug=self.request.GET.get('manufacturer'))
        if self.request.GET.get('supply_type'):
            qs = qs.filter(offer__supply_type__slug=self.request.GET.get('supply_type'))
        if self.request.GET.get('supply_target'):
            qs = qs.filter(offer__supply_target__slug=self.request.GET.get('supply_target'))
        qs = qs.filter(offer__amount__gte=0)
        return qs

    def sort_products(self,qs):
        if not self.request.GET:
            return qs
        if self.request.GET.get('sort'):
            qs = qs.order_by()
        return qs

    def get_queryset(self):
        qs = super().get_queryset()
        qs = self.filter_products(qs)
        qs = self.sort_products(qs)
        return qs

    # def get_cart_add_formset(self, products):
    #     return { product.id: CartAddInlineForm(initial={'offer': product.id,'amount': 1}) for product in products}


    def get_product_sorting_form(self):
        if not "products" in self.request.resolver_match.view_name:
            product_form_action = {'viewname': 'products:product_list', 'kwarg': {}}
        else:
            product_form_action = {'viewname': self.request.resolver_match.view_name,
                                   'kwargs': self.request.resolver_match.kwargs}
        return ProductSortForm(
            product_form_action=product_form_action,
            query_params=self.request.GET
        )

    def get_context_data(self, *, object_list=None, **kwargs):
        context = super().get_context_data(object_list=object_list, **kwargs)
        context['title'] = self.title
        context['product_sort_form'] = self.get_product_sorting_form()
        # context['product_cart_add_formset'] = self.get_cart_add_formset(self.object_list)
        return context