#
# Copyright 2023 © AE UTBM
# ae@utbm.fr / ae.info@utbm.fr
#
# This file is part of the website of the UTBM Student Association (AE UTBM),
# https://ae.utbm.fr.
#
# You can find the source code of the website at https://github.com/ae-utbm/sith
#
# LICENSED UNDER THE GNU GENERAL PUBLIC LICENSE VERSION 3 (GPLv3)
# SEE : https://raw.githubusercontent.com/ae-utbm/sith/master/LICENSE
# OR WITHIN THE LOCAL FILE "LICENSE"
#
#
from datetime import datetime, timedelta

from django.conf import settings
from django.contrib.auth.mixins import PermissionRequiredMixin, UserPassesTestMixin
from django.contrib.messages.views import SuccessMessageMixin
from django.core.exceptions import PermissionDenied
from django.db import transaction
from django.forms import CheckboxSelectMultiple
from django.forms.models import modelform_factory
from django.shortcuts import get_object_or_404
from django.urls import reverse, reverse_lazy
from django.utils import timezone
from django.utils.timezone import get_current_timezone
from django.utils.translation import gettext as _
from django.views.generic import DetailView, ListView, TemplateView
from django.views.generic.edit import CreateView, DeleteView, FormView, UpdateView

from core.auth.mixins import CanViewMixin
from core.utils import get_semester_code, get_start_of_semester
from counter.forms import (
    CloseCustomerAccountForm,
    CounterEditForm,
    ProductForm,
    ProductFormulaForm,
    ReturnableProductForm,
)
from counter.models import (
    Counter,
    Product,
    ProductFormula,
    ProductType,
    Refilling,
    ReturnableProduct,
    Selling,
)
from counter.utils import is_logged_in_counter
from counter.views.mixins import CounterAdminMixin, CounterAdminTabsMixin


class CounterListView(CounterAdminTabsMixin, CanViewMixin, ListView):
    """A list view for the admins."""

    model = Counter
    template_name = "counter/counter_list.jinja"
    current_tab = "counters"


class CounterEditView(
    CounterAdminTabsMixin, UserPassesTestMixin, SuccessMessageMixin, UpdateView
):
    """Edit a counter's main informations (for the counter's manager)."""

    model = Counter
    form_class = CounterEditForm
    pk_url_kwarg = "counter_id"
    template_name = "core/edit.jinja"
    current_tab = "counters"
    success_message = _("Counter update done")

    def test_func(self):
        if self.request.user.has_perm("counter.change_counter"):
            return True
        obj = self.get_object(queryset=self.get_queryset().select_related("club"))
        return obj.club.has_rights_in_club(self.request.user)

    def get_form_kwargs(self):
        return super().get_form_kwargs() | {"user": self.request.user}

    def get_success_url(self):
        return reverse_lazy("counter:admin", kwargs={"counter_id": self.object.id})


class CounterEditPropView(CounterAdminTabsMixin, CounterAdminMixin, UpdateView):
    """Edit a counter's main informations (for the counter's admin)."""

    model = Counter
    form_class = modelform_factory(Counter, fields=["name", "club", "type"])
    pk_url_kwarg = "counter_id"
    template_name = "core/edit.jinja"
    current_tab = "counters"


class CounterCreateView(CounterAdminTabsMixin, CounterAdminMixin, CreateView):
    """Create a counter (for the admins)."""

    model = Counter
    form_class = modelform_factory(
        Counter,
        fields=["name", "club", "type", "products"],
        widgets={"products": CheckboxSelectMultiple},
    )
    template_name = "core/create.jinja"
    current_tab = "counters"


class CounterDeleteView(CounterAdminTabsMixin, CounterAdminMixin, DeleteView):
    """Delete a counter (for the admins)."""

    model = Counter
    pk_url_kwarg = "counter_id"
    template_name = "core/delete_confirm.jinja"
    success_url = reverse_lazy("counter:admin_list")
    current_tab = "counters"


# Product management


class ProductTypeListView(CounterAdminTabsMixin, CounterAdminMixin, ListView):
    """A list view for the admins."""

    model = ProductType
    template_name = "counter/product_type_list.jinja"
    current_tab = "product_types"
    context_object_name = "product_types"


class ProductTypeCreateView(CounterAdminTabsMixin, CounterAdminMixin, CreateView):
    """A create view for the admins."""

    model = ProductType
    fields = ["name", "description", "comment", "icon"]
    template_name = "core/create.jinja"
    current_tab = "products"


class ProductTypeEditView(CounterAdminTabsMixin, CounterAdminMixin, UpdateView):
    """An edit view for the admins."""

    model = ProductType
    template_name = "core/edit.jinja"
    fields = ["name", "description", "comment", "icon"]
    pk_url_kwarg = "type_id"
    current_tab = "products"


class ProductListView(CounterAdminTabsMixin, CounterAdminMixin, TemplateView):
    current_tab = "products"
    template_name = "counter/product_list.jinja"


class ProductCreateView(CounterAdminTabsMixin, CounterAdminMixin, CreateView):
    """A create view for the admins."""

    model = Product
    form_class = ProductForm
    template_name = "counter/product_form.jinja"
    current_tab = "products"


class ProductEditView(CounterAdminTabsMixin, CounterAdminMixin, UpdateView):
    """An edit view for the admins."""

    model = Product
    form_class = ProductForm
    pk_url_kwarg = "product_id"
    template_name = "counter/product_form.jinja"
    current_tab = "products"


class ProductFormulaListView(CounterAdminTabsMixin, PermissionRequiredMixin, ListView):
    model = ProductFormula
    queryset = ProductFormula.objects.select_related("result").prefetch_related(
        "products"
    )
    template_name = "counter/formula_list.jinja"
    current_tab = "formulas"
    permission_required = "counter.view_productformula"


class ProductFormulaCreateView(
    CounterAdminTabsMixin, PermissionRequiredMixin, CreateView
):
    model = ProductFormula
    form_class = ProductFormulaForm
    pk_url_kwarg = "formula_id"
    template_name = "core/create.jinja"
    current_tab = "formulas"
    success_url = reverse_lazy("counter:product_formula_list")
    permission_required = "counter.add_productformula"


class ProductFormulaEditView(
    CounterAdminTabsMixin, PermissionRequiredMixin, UpdateView
):
    model = ProductFormula
    form_class = ProductFormulaForm
    pk_url_kwarg = "formula_id"
    template_name = "core/edit.jinja"
    current_tab = "formulas"
    success_url = reverse_lazy("counter:product_formula_list")
    permission_required = "counter.change_productformula"


class ProductFormulaDeleteView(
    CounterAdminTabsMixin, PermissionRequiredMixin, DeleteView
):
    model = ProductFormula
    pk_url_kwarg = "formula_id"
    template_name = "core/delete_confirm.jinja"
    current_tab = "formulas"
    success_url = reverse_lazy("counter:product_formula_list")
    permission_required = "counter.delete_productformula"

    def get_context_data(self, **kwargs):
        obj_name = self.object.result.name
        return super().get_context_data(**kwargs) | {
            "object_name": _("%(formula)s (formula)") % {"formula": obj_name},
            "help_text": _(
                "This action will only delete the formula, "
                "but not the %(product)s product itself."
            )
            % {"product": obj_name},
        }


class ReturnableProductListView(
    CounterAdminTabsMixin, PermissionRequiredMixin, ListView
):
    model = ReturnableProduct
    queryset = model.objects.select_related("product", "returned_product")
    template_name = "counter/returnable_list.jinja"
    current_tab = "returnable_products"
    permission_required = "counter.view_returnableproduct"


class ReturnableProductCreateView(
    CounterAdminTabsMixin, PermissionRequiredMixin, CreateView
):
    form_class = ReturnableProductForm
    template_name = "core/create.jinja"
    current_tab = "returnable_products"
    success_url = reverse_lazy("counter:returnable_list")
    permission_required = "counter.add_returnableproduct"


class ReturnableProductUpdateView(
    CounterAdminTabsMixin, PermissionRequiredMixin, UpdateView
):
    model = ReturnableProduct
    pk_url_kwarg = "returnable_id"
    queryset = model.objects.select_related("product", "returned_product")
    form_class = ReturnableProductForm
    template_name = "core/edit.jinja"
    current_tab = "returnable_products"
    success_url = reverse_lazy("counter:returnable_list")
    permission_required = "counter.change_returnableproduct"

    def get_context_data(self, **kwargs):
        return super().get_context_data(**kwargs) | {
            "object_name": _("returnable product : %(returnable)s -> %(returned)s")
            % {
                "returnable": self.object.product.name,
                "returned": self.object.returned_product.name,
            }
        }


class ReturnableProductDeleteView(
    CounterAdminTabsMixin, PermissionRequiredMixin, DeleteView
):
    model = ReturnableProduct
    pk_url_kwarg = "returnable_id"
    queryset = model.objects.select_related("product", "returned_product")
    template_name = "core/delete_confirm.jinja"
    current_tab = "returnable_products"
    success_url = reverse_lazy("counter:returnable_list")
    permission_required = "counter.delete_returnableproduct"

    def get_context_data(self, **kwargs):
        return super().get_context_data(**kwargs) | {
            "object_name": _("returnable product : %(returnable)s -> %(returned)s")
            % {
                "returnable": self.object.product.name,
                "returned": self.object.returned_product.name,
            }
        }


class RefillingDeleteView(DeleteView):
    """Delete a refilling (for the admins)."""

    model = Refilling
    pk_url_kwarg = "refilling_id"
    template_name = "core/delete_confirm.jinja"

    def dispatch(self, request, *args, **kwargs):
        """We have here a very particular right handling, we can't inherit from CanEditPropMixin."""
        self.object = self.get_object()
        if timezone.now() - self.object.date <= timedelta(
            minutes=settings.SITH_LAST_OPERATIONS_LIMIT
        ) and is_logged_in_counter(request):
            self.success_url = reverse(
                "counter:details", kwargs={"counter_id": self.object.counter.id}
            )
            return super().dispatch(request, *args, **kwargs)
        elif self.object.is_owned_by(request.user):
            self.success_url = reverse(
                "core:user_account", kwargs={"user_id": self.object.customer.user.id}
            )
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied


class SellingDeleteView(DeleteView):
    """Delete a selling (for the admins)."""

    model = Selling
    pk_url_kwarg = "selling_id"
    template_name = "core/delete_confirm.jinja"

    def dispatch(self, request, *args, **kwargs):
        """We have here a very particular right handling, we can't inherit from CanEditPropMixin."""
        self.object = self.get_object()
        if timezone.now() - self.object.date <= timedelta(
            minutes=settings.SITH_LAST_OPERATIONS_LIMIT
        ) and is_logged_in_counter(request):
            self.success_url = reverse(
                "counter:details", kwargs={"counter_id": self.object.counter.id}
            )
            return super().dispatch(request, *args, **kwargs)
        elif self.object.is_owned_by(request.user):
            self.success_url = reverse(
                "core:user_account", kwargs={"user_id": self.object.customer.user.id}
            )
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied


class CounterStatView(PermissionRequiredMixin, DetailView):
    """Show the bar stats."""

    model = Counter
    pk_url_kwarg = "counter_id"
    template_name = "counter/stats.jinja"
    permission_required = "counter.view_counter_stats"

    def get_context_data(self, **kwargs):
        """Add stats to the context."""
        counter: Counter = self.object
        start_date = get_start_of_semester()
        semester_start = datetime(
            start_date.year,
            start_date.month,
            start_date.day,
            tzinfo=get_current_timezone(),
        )
        office_hours = counter.get_top_barmen()
        kwargs = super().get_context_data(**kwargs)
        kwargs.update(
            {
                "counter": counter,
                "current_semester": get_semester_code(),
                "total_sellings": counter.get_total_sales(since=semester_start),
                "top_customers": counter.get_top_customers(since=semester_start)[:100],
                "top_barman": office_hours[:100],
                "top_barman_semester": (
                    office_hours.filter(start__gt=semester_start)[:100]
                ),
            }
        )
        return kwargs


class CounterRefillingListView(CounterAdminTabsMixin, CounterAdminMixin, ListView):
    """List of refillings on a counter."""

    model = Refilling
    template_name = "counter/refilling_list.jinja"
    current_tab = "counters"
    paginate_by = 30

    def dispatch(self, request, *args, **kwargs):
        self.counter = get_object_or_404(Counter, pk=kwargs["counter_id"])
        self.queryset = Refilling.objects.filter(counter__id=self.counter.id)
        return super().dispatch(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        kwargs = super().get_context_data(**kwargs)
        kwargs["counter"] = self.counter
        return kwargs


class RefoundAccountView(UserPassesTestMixin, FormView):
    """Create a selling with the same amount as the current user money."""

    template_name = "counter/refound_account.jinja"
    form_class = CloseCustomerAccountForm

    def test_func(self):
        return self.request.user.is_root or self.request.user.is_in_group(
            pk=settings.SITH_GROUP_ACCOUNTING_ADMIN_ID
        )

    def form_valid(self, form):
        self.customer = form.cleaned_data["user"]
        self.create_selling()
        return super().form_valid(form)

    def get_success_url(self):
        return self.request.path

    def create_selling(self):
        with transaction.atomic():
            uprice = self.customer.customer.amount
            refound_club_counter = Counter.objects.get(
                id=settings.SITH_COUNTER_REFOUND_ID
            )
            refound_club = refound_club_counter.club
            s = Selling(
                label=_("Refound account"),
                unit_price=uprice,
                quantity=1,
                seller=self.request.user,
                customer=self.customer.customer,
                club=refound_club,
                counter=refound_club_counter,
                product=Product.objects.get(id=settings.SITH_PRODUCT_REFOUND_ID),
            )
            s.save()