import random

from django.http import JsonResponse
from django.shortcuts import render
from django.views import View
from django.views.generic import ListView, TemplateView

from .forms import ContactForm
from .models import ContactSubmission, DownloadItem, FAQEntry


class HomeView(TemplateView):
    template_name = "pages/home.html"


class AboutView(TemplateView):
    template_name = "pages/about.html"


class DownloadsView(ListView):
    template_name = "pages/downloads.html"
    context_object_name = "download_items"

    def get_queryset(self):
        return DownloadItem.objects.filter(is_active=True).order_by("order", "platform")

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        all_items = DownloadItem.objects.order_by("order", "platform")
        context["windows_items"] = all_items.filter(
            platform=DownloadItem.PLATFORM_WINDOWS
        )
        context["macos_items"] = all_items.filter(platform=DownloadItem.PLATFORM_MACOS)
        context["linux_items"] = all_items.filter(platform=DownloadItem.PLATFORM_LINUX)
        return context


class FAQView(ListView):
    model = FAQEntry
    template_name = "pages/faq.html"
    context_object_name = "faq_entries"
    queryset = FAQEntry.objects.filter(is_active=True)


class ContactView(View):
    template_name = "pages/contact.html"

    def _new_captcha(self, request):
        a, b = random.randint(1, 9), random.randint(1, 9)
        request.session["captcha_answer"] = a + b
        return f"{a} + {b}"

    def get(self, request, *args, **kwargs):
        return render(
            request,
            self.template_name,
            {"form": ContactForm(), "captcha_question": self._new_captcha(request)},
        )

    def post(self, request, *args, **kwargs):
        form = ContactForm(request.POST)
        expected = request.session.get("captcha_answer")
        captcha_question = self._new_captcha(request)

        captcha_ok = False
        try:
            captcha_ok = int(request.POST.get("captcha_answer", "")) == expected
        except (ValueError, TypeError):
            pass

        if form.is_valid() and captcha_ok:
            form.save()
            return JsonResponse({"success": True})

        errors: dict = {}
        if not captcha_ok:
            errors["captcha"] = ["Incorrect answer — please try again."]
        errors.update(
            {field: [str(e) for e in errs] for field, errs in form.errors.items()}
        )
        return JsonResponse(
            {"success": False, "errors": errors, "captcha_question": captcha_question},
            status=400,
        )