# Copyright © 2022 Aravinth Manivannan <realaravinth@batsense.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
from django.shortcuts import render, redirect, get_object_or_404
from django.utils.http import urlencode
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth import get_user_model
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from django.template.loader import render_to_string
from django.views.decorators.csrf import csrf_protect
from django.core.mail import send_mail
from django.conf import settings
from django.urls import reverse

from accounts.decorators import confirm_access
from dash.models import Instance
from billing.utils import payment_fullfilled

from .utils import create_vm_if_not_exists, Infra, delete_vm


def default_ctx(title: str, username: str):
    """
    Default context for all dashboard pages
    """
    return {
        "title": title,
        "username": username,
        "open_instances": "open",
    }


@login_required
def create_instance(request, instance_name: str):
    """
    Dashboard homepage view
    """
    instance = get_object_or_404(Instance, name=instance_name, owned_by=request.user)
    if not payment_fullfilled(instance=instance):
        return redirect(reverse("billing.invoice.generate", args=(instance_name,)))

    res = create_vm_if_not_exists(instance=instance)
    if res is not None:
        (gitea_password, commit) = res

        ctx = {
            "username": request.user.username,
            "gitea_password": gitea_password,
            "gitea_uri": Infra.get_gitea_uri(instance=instance),
        }

        body = render_to_string(
            "infrastructure/emails/gitea-creds.txt",
            context=ctx,
        )

        sender = settings.HOSTEA["EMAIL_SENDER_ADDRESS"]

        send_mail(
            subject="[Hostea] Your Hostea instance is now online!",
            message=body,
            from_email=f"No reply Hostea<{sender}>",  # TODO read from settings.py
            recipient_list=[request.user.email],
        )

        return render(request, "infrastructure/html/create.html", ctx)
    return HttpResponse()


@login_required
@confirm_access
def delete_instance(request, instance_name: str):
    """
    Dashboard homepage view
    """
    instance = get_object_or_404(Instance, name=instance_name, owned_by=request.user)
    delete_vm(instance=instance)
    return redirect(reverse("dash.instances.list"))