"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 09.08.21

"""
from django.db.models import Sum
from django.utils.translation import gettext_lazy as _
from django.contrib.auth.decorators import login_required
from django.core.exceptions import ObjectDoesNotExist
from django.http import HttpRequest, Http404
from django.shortcuts import render, get_object_or_404

from compensation.models import EcoAccount
from compensation.tables import EcoAccountTable
from konova.contexts import BaseContext
from konova.decorators import any_group_check, default_group_required
from konova.forms import RemoveModalForm, SimpleGeomForm
from konova.settings import DEFAULT_GROUP, ZB_GROUP, ETS_GROUP
from konova.utils.user_checks import in_group


@login_required
@any_group_check
def account_index_view(request: HttpRequest):
    """
    Renders the index view for eco accounts

    Args:
        request (HttpRequest): The incoming request

    Returns:
        A rendered view
    """
    template = "generic_index.html"
    user = request.user
    eco_accounts = EcoAccount.objects.filter(
        deleted=None,
    )
    table = EcoAccountTable(
        request=request,
        queryset=eco_accounts
    )
    context = {
        "table": table,
    }
    context = BaseContext(request, context).context
    return render(request, template, context)


@login_required
@default_group_required
def account_new_view(request: HttpRequest):
    # ToDo
    pass


@login_required
@default_group_required
def account_edit_view(request: HttpRequest, id: str):
    # ToDo
    pass


@login_required
@any_group_check
def account_open_view(request: HttpRequest, id: str):
    """ Renders a detail view for a compensation

    Args:
        request (HttpRequest): The incoming request
        id (str): The compensation's id

    Returns:

    """
    template = "compensation/detail/eco_account/view.html"
    acc = get_object_or_404(EcoAccount, id=id)
    geom_form = SimpleGeomForm(instance=acc)
    _user = request.user
    is_data_shared = acc.is_shared_with(_user)

    # Order states according to surface
    before_states = acc.before_states.all().order_by("-surface")
    after_states = acc.after_states.all().order_by("-surface")

    # Precalculate logical errors between before- and after-states
    # Sum() returns None in case of no states, so we catch that and replace it with 0 for easier handling
    sum_before_states = before_states.aggregate(Sum("surface"))["surface__sum"] or 0
    sum_after_states = after_states.aggregate(Sum("surface"))["surface__sum"] or 0
    diff_states = abs(sum_before_states - sum_after_states)

    # Calculate rest of available surface for withdraws
    withdraws = acc.withdraws.all()
    withdraw_surfaces = withdraws.aggregate(Sum("surface"))["surface__sum"] or 0
    available = int(((sum_after_states - withdraw_surfaces) / sum_after_states) * 100)

    context = {
        "obj": acc,
        "geom_form": geom_form,
        "has_access": is_data_shared,
        "before_states": before_states,
        "after_states": after_states,
        "sum_before_states": sum_before_states,
        "sum_after_states": sum_after_states,
        "available": available,
        "diff_states": diff_states,
        "is_default_member": in_group(_user, DEFAULT_GROUP),
        "is_zb_member": in_group(_user, ZB_GROUP),
        "is_ets_member": in_group(_user, ETS_GROUP),
    }
    context = BaseContext(request, context).context
    return render(request, template, context)


@login_required
def account_remove_view(request: HttpRequest, id: str):
    # ToDo
    pass




@login_required
@default_group_required
def withdraw_remove_view(request: HttpRequest, id: str, withdraw_id: str):
    """ Renders a modal view for removing withdraws

    Args:
        request (HttpRequest): The incoming request
        id (str): The eco account's id
        withdraw_id (str): The withdraw's id

    Returns:

    """
    acc = get_object_or_404(EcoAccount, id=id)
    try:
        eco_withdraw = acc.withdraws.get(id=withdraw_id)
    except ObjectDoesNotExist:
        raise Http404("Unknown withdraw")

    form = RemoveModalForm(request.POST or None, instance=eco_withdraw, user=request.user)
    return form.process_request(
        request=request,
        msg_success=_("Withdraw removed")
    )