from datetime import datetime

from django.shortcuts import render

from .. import ParameterValidator
from .models import Supporter


def sustainers(request):
    with ParameterValidator(request.GET, 'upgrade_id') as validator:
        try:
            amount_param = float(request.GET['upgrade'])
        except (KeyError, ValueError):
            validator.fail()
        else:
            validator.validate('{:.2f}'.format(amount_param))
    partial_amount = amount_param if validator.valid else 0
    context = {
        'partial_amount': partial_amount,
        'minimum_amount': 120 - partial_amount,
    }
    return render(request, "supporters/sustainers.html", context)


def sponsors(request):
    """Conservancy Sponsors Page view

    Performs object queries necessary to render the sponsors page.
    """
    supporters = Supporter.objects.all().filter(display_until_date__gte=datetime.now())
    supporters_count = len(supporters)
    anonymous_count  = len(supporters.filter(display_name='Anonymous'))
    supporters = supporters.exclude(display_name='Anonymous').order_by('ledger_entity_id')
    c = {
        'supporters' : supporters,
        'supporters_count' : supporters_count,
        'anonymous_count' : anonymous_count
    }
    return render(request, "supporters/sponsors.html", c)