"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: ksp-servicestelle@sgdnord.rlp.de
Created on: 19.08.22

"""
from django.contrib.auth.mixins import LoginRequiredMixin
from django.shortcuts import get_object_or_404
from django.utils.translation import gettext_lazy as _

from compensation.forms.eco_account import EditEcoAccountForm, NewEcoAccountForm, RemoveEcoAccountModalForm
from compensation.models import EcoAccount
from compensation.tables.eco_account import EcoAccountTable
from konova.views.identifier import AbstractIdentifierGeneratorView
from konova.views.form import AbstractNewGeometryFormView, AbstractEditGeometryFormView
from konova.views.index import AbstractIndexView
from konova.views.detail import BaseDetailView
from konova.views.remove import BaseRemoveModalFormView


class EcoAccountIndexView(LoginRequiredMixin, AbstractIndexView):
    """ View class for indexing eco accounts

    """
    _INDEX_TABLE_CLS = EcoAccountTable
    _TAB_TITLE = _("Eco-account - Overview")

    def _get_queryset(self):
        qs = EcoAccount.objects.filter(
            deleted=None,
        ).order_by(
            "-modified__timestamp"
        )
        return qs


class NewEcoAccountFormView(AbstractNewGeometryFormView):
    """ Form view class

    Renders a form for new eco accounts

    """
    _FORM_CLS = NewEcoAccountForm
    _MODEL_CLS = EcoAccount
    _TEMPLATE = "compensation/form/view.html"
    _TAB_TITLE = _("New Eco-Account")
    _REDIRECT_URL = "compensation:acc:detail"

    def _user_has_permission(self, user, **kwargs):
        # User has to be a default user
        return user.is_default_user()


class EditEcoAccountFormView(AbstractEditGeometryFormView):
    """ Form view class

    Renders a form for editing of eco accounts

    """
    _FORM_CLS = EditEcoAccountForm
    _MODEL_CLS = EcoAccount
    _TEMPLATE = "compensation/form/view.html"
    _REDIRECT_URL = "compensation:acc:detail"

    def _user_has_permission(self, user, **kwargs):
        # User has to be a default user
        return user.is_default_user()


class EcoAccountIdentifierGeneratorView(LoginRequiredMixin, AbstractIdentifierGeneratorView):
    """ View class for identifier generation on eco accounts

    """
    _MODEL_CLS = EcoAccount
    _REDIRECT_URL = "compensation:acc:index"


class EcoAccountDetailView(BaseDetailView):
    """ Detail view class

    Renders details of an eco account

    """
    _MODEL_CLS = EcoAccount
    _TEMPLATE = "compensation/detail/eco_account/view.html"

    def _get_object(self, id: str):
        """ Fetch object for detail view

        Args:
            id (str): The record's id'

        Returns:

        """
        acc = get_object_or_404(
            EcoAccount.objects.prefetch_related(
                "deadlines",
            ).select_related(
                'geometry',
                'responsible',
            ),
            id=id,
            deleted=None,
        )
        return acc

    def _get_detail_context(self, obj: EcoAccount):
        """ Generate object specific detail context for  view

        Args:
            obj (): The record

        Returns:

        """
        # Order states according to surface
        before_states = obj.before_states.order_by("-surface")
        after_states = obj.after_states.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 = obj.get_surface_before_states()
        sum_after_states = obj.get_surface_after_states()
        diff_states = abs(sum_before_states - sum_after_states)
        # Calculate rest of available surface for deductions
        available_total = obj.deductable_rest
        available_relative = obj.get_deductable_rest_relative()

        # Prefetch related data to decrease the amount of db connections
        deductions = obj.deductions.filter(
            intervention__deleted=None,
        )
        actions = obj.actions.all()

        context = {
            "before_states": before_states,
            "after_states": after_states,
            "sum_before_states": sum_before_states,
            "sum_after_states": sum_after_states,
            "diff_states": diff_states,
            "available": available_relative,
            "available_total": available_total,
            "deductions": deductions,
            "actions": actions,
            "has_finished_deadlines": obj.get_finished_deadlines().exists(),
        }
        return context


class RemoveEcoAccountView(LoginRequiredMixin, BaseRemoveModalFormView):
    """ Form view class

    Renders a form for removing eco accounts

    """
    _MODEL_CLS = EcoAccount
    _FORM_CLS = RemoveEcoAccountModalForm
    _REDIRECT_URL = "compensation:acc:index"

    def _user_has_permission(self, user, **kwargs):
        return user.is_default_user()