"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 16.11.20

"""
from django.contrib import messages
from django.contrib.auth import logout
from django.contrib.auth.decorators import login_required
from django.http import HttpRequest, FileResponse
from django.shortcuts import redirect, render, get_object_or_404
from django.utils import timezone
from django.utils.translation import gettext_lazy as _

from compensation.models import Compensation, EcoAccount
from intervention.models import Intervention
from konova.contexts import BaseContext
from konova.forms import RemoveModalForm
from konova.models import Document
from news.models import ServerMessage
from konova.settings import SSO_SERVER_BASE


def logout_view(request: HttpRequest):
    """
    Logout route for ending the session manually.

    Args:
        request (HttpRequest): The used request object

    Returns:
        A redirect
    """
    logout(request)
    return redirect(SSO_SERVER_BASE)


@login_required
def home_view(request: HttpRequest):
    """
    Renders the landing page

    Args:
        request (HttpRequest): The used request object

    Returns:
        A redirect
    """
    template = "konova/home.html"
    now = timezone.now()
    user = request.user

    # Fetch the four newest active and published ServerMessages
    msgs = ServerMessage.objects.filter(
        is_active=True,
        publish_on__lte=now,
        unpublish_on__gte=now,
    ).order_by(
        "-publish_on"
    )[:4]

    # First fetch all valid objects (undeleted, only newest versions)
    interventions = Intervention.objects.filter(
        deleted_on=None,
        deleted_by=None,
        next_version=None,
    )
    # Then fetch only user related ones
    user_interventions = interventions.filter(
        users__in=[user]
    )

    # Repeat for other objects
    comps = Compensation.objects.filter(
        deleted_on=None,
        deleted_by=None,
        next_version=None,
    )
    user_comps = comps.filter(
        users__in=[user]
    )
    eco_accs = EcoAccount.objects.filter(
        deleted_on=None,
        deleted_by=None,
        next_version=None,
    )
    user_ecco_accs = eco_accs.filter(
        users__in=[user]
    )

    additional_context = {
        "msgs": msgs,
        "total_intervention_count": interventions.count(),
        "user_intervention_count": user_interventions.count(),
        "total_compensation_count": comps.count(),
        "user_compensation_count": user_comps.count(),
        "total_eco_count": eco_accs.count(),
        "user_eco_count": user_ecco_accs.count(),
    }
    context = BaseContext(request, additional_context).context
    return render(request, template, context)


@login_required
def get_document_view(request: HttpRequest, id: str):
    """ Returns a document as downloadable attachment

    Args:
        request (HttpRequest): The incoming request
        id (str): The document id

    Returns:

    """
    doc = get_object_or_404(Document, id=id)
    return FileResponse(doc.document, as_attachment=True)


@login_required
def remove_document_view(request: HttpRequest, id: str):
    """ Renders a form for uploading new documents

    This function works using a modal. We are not using the regular way, the django bootstrap modal forms are
    intended to be used. Instead of View classes we work using the classic way of dealing with forms (see below).
    It is important to mention, that modal forms, which should reload the page afterwards, must provide a
    'reload_page' bool in the context. This way, the modal may reload the page or not.

    For further details see the comments in templates/modal or
    https://github.com/trco/django-bootstrap-modal-forms

    Args:
        request (HttpRequest): The incoming request

    Returns:

    """
    doc = get_object_or_404(Document, id=id)
    title = doc.title
    form = RemoveModalForm(request.POST or None, instance=doc, user=request.user)
    template = form.template
    if request.method == "POST":
        if form.is_valid():
            doc.delete()
            messages.success(
                request,
                _("Document '{}' deleted").format(title)
            )
            return redirect(request.META.get("HTTP_REFERER", "home"))
        else:
            messages.info(
                request,
                _("There was an error on this form.")
            )
            return redirect(request.META.get("HTTP_REFERER", "home"))
    elif request.method == "GET":
        context = {
            "form": form,
        }
        context = BaseContext(request, context).context
        return render(request, template, context)
    else:
        raise NotImplementedError