from django.contrib.auth.decorators import login_required
from django.db.models import Count
from django.http import JsonResponse
from django.shortcuts import render
# Create your views here.
from django.utils.decorators import method_decorator
from django.views.generic import ListView

from policy.models import DroughtSpi


@method_decorator(login_required, name='dispatch')
class DroughtSpiListView(ListView):
    context_object_name = 'spis'
    paginate_by = 100

    def get_queryset(self):
        self.keyword = self.request.GET.get('keyword', '')
        if len(self.keyword) != 0:
            return DroughtSpi.objects.filter(code__contains=self.keyword)
        return DroughtSpi.objects.all()

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

@login_required
def drought_spi_chart(request):
    code = request.GET.get('code', 'V7001')
    year_from = request.GET.get('year_from', '1979')
    year_to = request.GET.get('year_to', '1989')
    codes = DroughtSpi.objects.only('code').values('code').annotate(total=Count('code')).order_by('code')
    years = range(1979, 2018)
    months = range(1, 13)
    spis = DroughtSpi.objects.filter(code=code, year__range=(year_from, year_to))
    return render(request, 'policy/drought_spi_chart.html',
                  {'codes': codes, 'years': years, 'months': months, 'spis': spis, 'code': code, 'year_from': year_from,
                   'year_to': year_to, })

@login_required
def timeline4(request):
    return render(request, 'graphic/timeline4.html')

@login_required
def timeline5(request):
    return render(request, 'graphic/timeline5.html')

@login_required
def drought_spi_json(request):
    code = request.GET.get('code')
    year_from = request.GET.get('year_from')
    year_to = request.GET.get('year_to')
    year = request.GET.get('year')
    month = request.GET.get('month')
    q = DroughtSpi.objects.all()
    if code:
        q = q.filter(code=code)
    if year_from and year_to:
        q = q.filter(year__range=(year_from, year_to))
    if year and month:
        q = q.filter(year=year, month=month)
    results = []
    for spi in q:
        o = dict()
        o['code'] = spi.code
        o['year'] = str(spi.year)
        o['month'] = str(spi.month)
        o['value'] = spi.value
        results.append(o)
    return JsonResponse(results, safe=False)