from django.contrib.auth.decorators import login_required
from django.db.models import Sum
from django.shortcuts import render, redirect, get_object_or_404
from refunding.forms import RefundFormPublic
from refunding.models import Payment, Refund


@login_required
def not_refunded_payments(request):
    payments = Payment.objects.filter(refund=None)
    value_sum = payments.aggregate(Sum('value')).get('value__sum')
    if value_sum:
        value_sum /= 100
    else:
        value_sum = 0

    context = {
        'payments': payments,
        'sum': value_sum,
        'default_nothing': 'No payment to be refunded.'
    }
    return render(request, "refunding/payments.html", context)


@login_required
def latest_refunds(request):
    refunds = Refund.objects.all().order_by('date')[:20]
    context = {
        'refunds': refunds,
        'default_nothing': 'No refund to show.'
    }
    return render(request, "refunding/refunds.html", context)


@login_required
def new_refund(request):
    if request.method == 'POST':
        form = RefundFormPublic(request.POST)
        if form.is_valid():
            refund = form.save()
            refund.user = request.user
            refund.save()
            return redirect('latest_refunds')
    else:
        form = RefundFormPublic()

    context = {
        'form': form,
        'title': 'New refund'
    }
    return render(request, "refunding/edit_new_refund.html", context)


@login_required
def refund_edit(request, pk):
    refund = get_object_or_404(Refund, pk=pk)
    if request.method == 'POST':
        form = RefundFormPublic(request.POST, instance=refund)
        if form.is_valid():
            refund = form.save()
            refund.user = request.user
            refund.save()
            return redirect('latest_refunds')
    else:
        form = RefundFormPublic(instance=refund)
    context = {
        'form': form,
        'title': 'Edit refund'
    }
    return render(request, 'refunding/edit_new_refund.html', context)