from pathlib import Path

from django.conf import settings
from django.contrib import messages
from django.contrib.auth import login
from django.contrib.auth.decorators import login_required
from django.http import FileResponse, Http404, HttpRequest, HttpResponse
from django.shortcuts import get_object_or_404, redirect, render
from django.views.generic import TemplateView

from .forms import ClientSiteForm, SignUpForm
from .models import ClientSite, TemplateOption
from .services import SiteGenerator


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


def signup_view(request: HttpRequest) -> HttpResponse:
    if request.user.is_authenticated:
        return redirect("dashboard")
    if request.method == "POST":
        form = SignUpForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect("dashboard")
    else:
        form = SignUpForm()
    return render(request, "registration/signup.html", {"form": form})


@login_required
def dashboard_view(request: HttpRequest) -> HttpResponse:
    sites = ClientSite.objects.filter(owner=request.user).select_related("template_option")
    form = ClientSiteForm()
    form.fields["template_option"].queryset = TemplateOption.objects.filter(is_active=True)
    return render(request, "builder/dashboard.html", {"sites": sites, "form": form})


@login_required
def create_site_view(request: HttpRequest) -> HttpResponse:
    if request.method != "POST":
        return redirect("dashboard")

    form = ClientSiteForm(request.POST)
    form.fields["template_option"].queryset = TemplateOption.objects.filter(is_active=True)
    if not form.is_valid():
        sites = ClientSite.objects.filter(owner=request.user).select_related("template_option")
        return render(request, "builder/dashboard.html", {"sites": sites, "form": form})

    site = form.save(commit=False)
    site.owner = request.user
    site.status = ClientSite.Status.GENERATING
    site.save()

    generator = SiteGenerator()
    try:
        generator.build_all(site)
        messages.success(request, "Site generated successfully.")
    except Exception as exc:
        site.status = ClientSite.Status.FAILED
        site.last_error = str(exc)
        site.save(update_fields=["status", "last_error", "updated_at"])
        messages.error(request, "Generation failed. Check site detail for error info.")

    return redirect("site_detail", site_id=site.id)


@login_required
def site_detail_view(request: HttpRequest, site_id) -> HttpResponse:
    site = get_object_or_404(ClientSite, id=site_id, owner=request.user)
    return render(request, "builder/site_detail.html", {"site": site})


def _download_site_file(site: ClientSite, relative_path: str) -> FileResponse:
    if not relative_path:
        raise Http404("File not generated yet.")
    full_path = Path(settings.MEDIA_ROOT) / relative_path
    if not full_path.exists():
        raise Http404("File missing from storage.")
    return FileResponse(full_path.open("rb"), as_attachment=True, filename=full_path.name)


@login_required
def download_basic_site(request: HttpRequest, site_id) -> FileResponse:
    site = get_object_or_404(ClientSite, id=site_id, owner=request.user)
    return _download_site_file(site, site.basic_zip_path)


@login_required
def download_django_site(request: HttpRequest, site_id) -> FileResponse:
    site = get_object_or_404(ClientSite, id=site_id, owner=request.user)
    return _download_site_file(site, site.django_zip_path)