import tempfile
import subprocess
import shutil
import os

from django.conf import settings
from django.shortcuts import get_object_or_404, render
from django.http import HttpResponse
from django.views import generic
from django.db.models import Q

from tvorba.models import Cislo, Deadline
from personalni.models.resitel import Resitel
from vysledkovky.utils import body_resitelu


def cisloObalkyView(request, rocnik, cislo):
	realne_cislo = get_object_or_404(Cislo, poradi=cislo, rocnik__rocnik=rocnik)
	return obalkyView(request, Resitel.objects.aktivni_resitele(realne_cislo))


def obalkyView(request, resitele):
	tex = render(
		request, 'tvorba/archiv/obalky.tex',
		{'resitele': resitele}
	).content

	tempdir = tempfile.mkdtemp()
	with open(tempdir+"/obalky.tex", "w") as texfile:
		texfile.write(tex.decode())
	shutil.copy(os.path.join(settings.STATIC_ROOT, 'seminar/lisak.pdf'), tempdir)
	subprocess.call(["pdflatex", "obalky.tex"], cwd=tempdir)

	with open(tempdir+"/obalky.pdf", "rb") as pdffile:
		response = HttpResponse(pdffile.read(), content_type='application/pdf')
	shutil.rmtree(tempdir)
	return response


class OdmenyView(generic.TemplateView):
	template_name = 'tvorba/archiv/odmeny.html'

	def get_context_data(self, **kwargs):
		context = super().get_context_data(**kwargs)
		fromcislo = get_object_or_404(
			Cislo,
			rocnik=self.kwargs.get('frocnik'),
			poradi=self.kwargs.get('fcislo'),
		)
		tocislo = get_object_or_404(
			Cislo,
			rocnik=self.kwargs.get('trocnik'),
			poradi=self.kwargs.get('tcislo'),
		)
		resitele = Resitel.objects.aktivni_resitele(tocislo)

		def get_diff(from_deadline: Deadline, to_deadline: Deadline):
			frombody = body_resitelu(resitele=resitele, jen_verejne=False, do=from_deadline)
			tobody = body_resitelu(resitele=resitele, jen_verejne=False, do=to_deadline)
			outlist = []
			for resitel in resitele:
				fbody = frombody.get(resitel.id, 0)
				tbody = tobody.get(resitel.id, 0)
				ftitul = resitel.get_titul(fbody)
				ttitul = resitel.get_titul(tbody)
				if ftitul != ttitul:
					outlist.append({
						'jmeno': resitel.osoba.plne_jmeno(),
						'ftitul': ftitul,
						'ttitul': ttitul},
					)
			return outlist

		def posledni_deadline_oprava(cislo: Cislo) -> Deadline:
			posledni_deadline = cislo.posledni_deadline
			if posledni_deadline is None:
				return Deadline.objects.filter(
					Q(cislo__poradi__lt=cislo.poradi, cislo__rocnik=cislo.rocnik) |
					Q(cislo__rocnik__rocnik__lt=cislo.rocnik.rocnik),
				).order_by("deadline").last()
			return posledni_deadline

		context["from_cislo"] = fromcislo
		context["to_cislo"] = tocislo
		from_deadline = posledni_deadline_oprava(fromcislo)
		to_deadline = posledni_deadline_oprava(tocislo)
		context["from_deadline"] = from_deadline
		context["to_deadline"] = to_deadline
		context["zmeny"] = get_diff(from_deadline, to_deadline)

		return context