# This file is part of photo21
# Copyright (C) 2021-2022  Amicale des élèves de l'ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later

import os

from django.conf import settings
from django.contrib.auth import get_user_model
from django.contrib.auth.mixins import LoginRequiredMixin
from django.http import FileResponse, Http404
from django.views.generic import ListView, View
from photologue.models import Gallery, Photo, Video


class MediaAccess(View):
    def get(self, request, path):
        if not request.user.is_authenticated:
            from django.contrib.auth.views import redirect_to_login
            try:
                # Direct match (original photo file)
                allowed = Photo.objects.filter(
                    image=path,
                    galleries__is_public=True,
                ).exists()
                # Cache files (thumbnails/display) are derived from original photos
                if not allowed and '/cache/' in path:
                    original_dir = os.path.dirname(os.path.dirname(path))
                    allowed = Photo.objects.filter(
                        image__startswith=original_dir + '/',
                        galleries__is_public=True,
                    ).exists()
                # Video files and their thumbnails
                if not allowed:
                    allowed = (
                        Video.objects.filter(file=path, galleries__is_public=True).exists()
                        or Video.objects.filter(thumbnail=path, galleries__is_public=True).exists()
                    )
            except Exception:
                return redirect_to_login(request.get_full_path())
            if not allowed:
                return redirect_to_login(request.get_full_path())
        media_root = os.path.realpath(settings.MEDIA_ROOT)
        file_path = os.path.realpath(os.path.join(media_root, path))
        if not file_path.startswith(media_root + os.sep):
            raise Http404
        if not os.path.isfile(file_path):
            raise Http404
        f = open(file_path, 'rb')
        try:
            response = FileResponse(f)
            response['Cache-Control'] = 'max-age=2678400'
            return response
        except Exception:
            f.close()
            raise


class IndexView(LoginRequiredMixin, ListView):
    queryset = Gallery.objects.all()
    paginate_by = 4
    template_name = "index.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        # Get superusers
        user_model = get_user_model()
        superusers = user_model.objects.filter(is_superuser=True)
        context["superusers"] = superusers

        return context


def oauth_context(request):
    return {
        "OAUTH_BUTTON_TEXT": settings.OAUTH_BUTTON_TEXT,
        "OAUTH_BUTTON_IMAGE": settings.OAUTH_BUTTON_IMAGE,
        "SOCIALACCOUNT_ONLY": settings.OAUTH_ONLY,
    }