from itertools import chain

from django.shortcuts import render

from .models import Service, Cost, Good


def list_services(request):
    context = {
        'services': Service.objects.all(),
    }
    return render(request, 'costs/services_list.html', context)


def list_resources(request):
    context = {
        'goods': Good.objects.all(),
        'costs': Cost.objects.all(),
    }
    return render(request, 'costs/resources_list.html', context)


def detail_service(request, pk):
    service = Service.objects.get(pk=pk)

    costs_uses = CostUse.objects.filter(service=service)
    goods_uses = GoodUse.objects.filter(service=service)

    context = {
        'service': service,
        'costs_uses': costs_uses,
        'goods_uses': goods_uses,
        'total_costs_price': sum(chain(
            (i.monthly_provision_share() for i in goods_uses),
            (i.cost_share() for i in costs_uses)
        ))
    }
    return render(request, 'costs/service_detail.html', context)