# -*- coding:utf-8 -*
#
# Copyright 2016,2017
# - Guillaume "Lo-J" Renaud <renaudg779@gmail.com>
# - Skia <skia@libskia.so>
#
# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
# http://ae.utbm.fr.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License a 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
# Place - Suite 330, Boston, MA 02111-1307, USA.
#
#

from collections import OrderedDict
from datetime import datetime, timedelta

from django.utils import timezone
from django.shortcuts import render, get_object_or_404
from django.views.generic import ListView, DetailView, RedirectView, TemplateView
from django.views.generic.edit import (
    UpdateView,
    CreateView,
    DeleteView,
    ProcessFormView,
    FormMixin,
    BaseFormView,
)
from django.utils.translation import gettext_lazy as _
from django import forms
from django.http import HttpResponseRedirect, HttpResponse
from django.forms.models import modelform_factory
from django.urls import reverse_lazy, reverse
from django.db import transaction, DataError

from core.views import (
    CanViewMixin,
    CanEditMixin,
    CanEditPropMixin,
    CanCreateMixin,
    TabedViewMixin,
)
from counter.views import CounterAdminTabsMixin, CounterTabsMixin
from counter.models import Counter, ProductType
from stock.models import Stock, StockItem, ShoppingList, ShoppingListItem


class StockItemList(CounterAdminTabsMixin, CanCreateMixin, ListView):
    """
    The stockitems list view for the counter owner
    """

    model = Stock
    template_name = "stock/stock_item_list.jinja"
    pk_url_kwarg = "stock_id"
    current_tab = "stocks"

    def get_context_data(self):
        ret = super(StockItemList, self).get_context_data()
        if "stock_id" in self.kwargs.keys():
            ret["stock"] = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        return ret


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

    model = Stock
    template_name = "stock/stock_list.jinja"
    current_tab = "stocks"


class StockEditForm(forms.ModelForm):
    """
    A form to change stock's characteristics
    """

    class Meta:
        model = Stock
        fields = ["name", "counter"]

    def __init__(self, *args, **kwargs):
        super(StockEditForm, self).__init__(*args, **kwargs)

    def save(self, *args, **kwargs):
        return super(StockEditForm, self).save(*args, **kwargs)


class StockEditView(CounterAdminTabsMixin, CanEditPropMixin, UpdateView):
    """
    An edit view for the stock
    """

    model = Stock
    form_class = modelform_factory(Stock, fields=["name", "counter"])
    pk_url_kwarg = "stock_id"
    template_name = "core/edit.jinja"
    current_tab = "stocks"


class StockItemEditView(CounterAdminTabsMixin, CanEditPropMixin, UpdateView):
    """
    An edit view for a stock item
    """

    model = StockItem
    form_class = modelform_factory(
        StockItem,
        fields=[
            "name",
            "unit_quantity",
            "effective_quantity",
            "minimal_quantity",
            "type",
            "stock_owner",
        ],
    )
    pk_url_kwarg = "item_id"
    template_name = "core/edit.jinja"
    current_tab = "stocks"


class StockCreateView(CounterAdminTabsMixin, CanCreateMixin, CreateView):
    """
    A create view for a new Stock
    """

    model = Stock
    form_class = modelform_factory(Stock, fields=["name", "counter"])
    template_name = "core/create.jinja"
    pk_url_kwarg = "counter_id"
    current_tab = "stocks"
    success_url = reverse_lazy("stock:list")

    def get_initial(self):
        ret = super(StockCreateView, self).get_initial()
        if "counter_id" in self.kwargs.keys():
            ret["counter"] = self.kwargs["counter_id"]
        return ret


class StockItemCreateView(CounterAdminTabsMixin, CanCreateMixin, CreateView):
    """
    A create view for a new StockItem
    """

    model = StockItem
    form_class = modelform_factory(
        StockItem,
        fields=[
            "name",
            "unit_quantity",
            "effective_quantity",
            "minimal_quantity",
            "type",
            "stock_owner",
        ],
    )
    template_name = "core/create.jinja"
    pk_url_kwarg = "stock_id"
    current_tab = "stocks"

    def get_initial(self):
        ret = super(StockItemCreateView, self).get_initial()
        if "stock_id" in self.kwargs.keys():
            ret["stock_owner"] = self.kwargs["stock_id"]
        return ret

    def get_success_url(self):
        return reverse_lazy(
            "stock:items_list", kwargs={"stock_id": self.object.stock_owner.id}
        )


class StockShoppingListView(CounterAdminTabsMixin, CanViewMixin, ListView):
    """
    A list view for the people to know the item to buy
    """

    model = Stock
    template_name = "stock/stock_shopping_list.jinja"
    pk_url_kwarg = "stock_id"
    current_tab = "stocks"

    def get_context_data(self):
        ret = super(StockShoppingListView, self).get_context_data()
        if "stock_id" in self.kwargs.keys():
            ret["stock"] = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        return ret


class StockItemQuantityForm(forms.BaseForm):
    def clean(self):
        with transaction.atomic():
            self.stock = Stock.objects.filter(id=self.stock_id).first()
            shopping_list = ShoppingList(
                name="Courses " + self.stock.counter.name,
                date=timezone.now(),
                todo=True,
            )
            shopping_list.save()
            shopping_list.stock_owner = self.stock
            shopping_list.save()
            for k, t in self.cleaned_data.items():
                if k == "name":
                    shopping_list.name = t
                    shopping_list.save()
                elif k == "comment":
                    shopping_list.comment = t
                    shopping_list.save()
                else:
                    if t > 0:
                        item_id = int(k[5:])
                        item = StockItem.objects.filter(id=item_id).first()
                        shoppinglist_item = ShoppingListItem(
                            stockitem_owner=item,
                            name=item.name,
                            type=item.type,
                            tobuy_quantity=t,
                        )
                        shoppinglist_item.save()
                        shoppinglist_item.shopping_lists.add(shopping_list)
                        shoppinglist_item.save()

        return self.cleaned_data


class StockItemQuantityBaseFormView(
    CounterAdminTabsMixin, CanEditMixin, DetailView, BaseFormView
):
    """
    docstring for StockItemOutList
    """

    model = StockItem
    template_name = "stock/shopping_list_quantity.jinja"
    pk_url_kwarg = "stock_id"
    current_tab = "stocks"

    def get_form_class(self):
        fields = OrderedDict()
        kwargs = {}
        fields["name"] = forms.CharField(
            max_length=30, required=True, label=_("Shopping list name")
        )
        for t in ProductType.objects.order_by("name").all():
            for i in self.stock.items.filter(type=t).order_by("name").all():
                if i.effective_quantity <= i.minimal_quantity:
                    field_name = "item-%s" % (str(i.id))
                    fields[field_name] = forms.IntegerField(
                        required=True,
                        label=str(i),
                        initial=0,
                        help_text=_(str(i.effective_quantity) + " left"),
                    )
        fields["comment"] = forms.CharField(
            widget=forms.Textarea(
                attrs={
                    "placeholder": _(
                        "Add here, items to buy that are not reference as a stock item (example : sponge, knife, mugs ...)"
                    )
                }
            ),
            required=False,
            label=_("Comments"),
        )
        kwargs["stock_id"] = self.stock.id
        kwargs["base_fields"] = fields
        return type("StockItemQuantityForm", (StockItemQuantityForm,), kwargs)

    def get(self, request, *args, **kwargs):
        """
        Simple get view
        """
        self.stock = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        return super(StockItemQuantityBaseFormView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        """
        Handle the many possibilities of the post request
        """
        self.object = self.get_object()
        self.stock = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        return super(StockItemQuantityBaseFormView, self).post(request, *args, **kwargs)

    def form_valid(self, form):
        return super(StockItemQuantityBaseFormView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        kwargs = super(StockItemQuantityBaseFormView, self).get_context_data(**kwargs)
        if "form" not in kwargs.keys():
            kwargs["form"] = self.get_form()
        kwargs["stock"] = self.stock
        return kwargs

    def get_success_url(self):
        return reverse_lazy(
            "stock:shoppinglist_list", args=self.args, kwargs=self.kwargs
        )


class StockShoppingListItemListView(CounterAdminTabsMixin, CanViewMixin, ListView):
    """docstring for StockShoppingListItemListView"""

    model = ShoppingList
    template_name = "stock/shopping_list_items.jinja"
    pk_url_kwarg = "shoppinglist_id"
    current_tab = "stocks"

    def get_context_data(self):
        ret = super(StockShoppingListItemListView, self).get_context_data()
        if "shoppinglist_id" in self.kwargs.keys():
            ret["shoppinglist"] = ShoppingList.objects.filter(
                id=self.kwargs["shoppinglist_id"]
            ).first()
        return ret


class StockShoppingListDeleteView(CounterAdminTabsMixin, CanEditMixin, DeleteView):
    """
    Delete a ShoppingList (for the resonsible account)
    """

    model = ShoppingList
    pk_url_kwarg = "shoppinglist_id"
    template_name = "core/delete_confirm.jinja"
    current_tab = "stocks"

    def get_success_url(self):
        return reverse_lazy(
            "stock:shoppinglist_list", kwargs={"stock_id": self.object.stock_owner.id}
        )


class StockShopppingListSetDone(CanEditMixin, DetailView):
    """
    Set a ShoppingList as done
    """

    model = ShoppingList
    pk_url_kwarg = "shoppinglist_id"

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        self.object.todo = False
        self.object.save()
        return HttpResponseRedirect(
            reverse(
                "stock:shoppinglist_list",
                args=self.args,
                kwargs={"stock_id": self.object.stock_owner.id},
            )
        )

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return HttpResponseRedirect(
            reverse(
                "stock:shoppinglist_list",
                args=self.args,
                kwargs={"stock_id": self.object.stock_owner.id},
            )
        )


class StockShopppingListSetTodo(CanEditMixin, DetailView):
    """
    Set a ShoppingList as done
    """

    model = ShoppingList
    pk_url_kwarg = "shoppinglist_id"

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        self.object.todo = True
        self.object.save()
        return HttpResponseRedirect(
            reverse(
                "stock:shoppinglist_list",
                args=self.args,
                kwargs={"stock_id": self.object.stock_owner.id},
            )
        )

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return HttpResponseRedirect(
            reverse(
                "stock:shoppinglist_list",
                args=self.args,
                kwargs={"stock_id": self.object.stock_owner.id},
            )
        )


class StockUpdateAfterShopppingForm(forms.BaseForm):
    def clean(self):
        with transaction.atomic():
            self.shoppinglist = ShoppingList.objects.filter(
                id=self.shoppinglist_id
            ).first()
            for k, t in self.cleaned_data.items():
                shoppinglist_item_id = int(k[5:])
                if int(t) > 0:
                    shoppinglist_item = ShoppingListItem.objects.filter(
                        id=shoppinglist_item_id
                    ).first()
                    shoppinglist_item.bought_quantity = int(t)
                    shoppinglist_item.save()
                    shoppinglist_item.stockitem_owner.effective_quantity += int(t)
                    shoppinglist_item.stockitem_owner.save()
            self.shoppinglist.todo = False
            self.shoppinglist.save()
        return self.cleaned_data


class StockUpdateAfterShopppingBaseFormView(
    CounterAdminTabsMixin, CanEditMixin, DetailView, BaseFormView
):
    """
    docstring for StockUpdateAfterShopppingBaseFormView
    """

    model = ShoppingList
    template_name = "stock/update_after_shopping.jinja"
    pk_url_kwarg = "shoppinglist_id"
    current_tab = "stocks"

    def get_form_class(self):
        fields = OrderedDict()
        kwargs = {}
        for t in ProductType.objects.order_by("name").all():
            for i in (
                self.shoppinglist.shopping_items_to_buy.filter(type=t)
                .order_by("name")
                .all()
            ):
                field_name = "item-%s" % (str(i.id))
                fields[field_name] = forms.CharField(
                    max_length=30,
                    required=True,
                    label=str(i),
                    help_text=_(str(i.tobuy_quantity) + " asked"),
                )
        kwargs["shoppinglist_id"] = self.shoppinglist.id
        kwargs["base_fields"] = fields
        return type(
            "StockUpdateAfterShopppingForm", (StockUpdateAfterShopppingForm,), kwargs
        )

    def get(self, request, *args, **kwargs):
        self.shoppinglist = ShoppingList.objects.filter(
            id=self.kwargs["shoppinglist_id"]
        ).first()
        return super(StockUpdateAfterShopppingBaseFormView, self).get(
            request, *args, **kwargs
        )

    def post(self, request, *args, **kwargs):
        """
        Handle the many possibilities of the post request
        """
        self.object = self.get_object()
        self.shoppinglist = ShoppingList.objects.filter(
            id=self.kwargs["shoppinglist_id"]
        ).first()
        return super(StockUpdateAfterShopppingBaseFormView, self).post(
            request, *args, **kwargs
        )

    def form_valid(self, form):
        """
        We handle here the redirection
        """
        return super(StockUpdateAfterShopppingBaseFormView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        kwargs = super(StockUpdateAfterShopppingBaseFormView, self).get_context_data(
            **kwargs
        )
        if "form" not in kwargs.keys():
            kwargs["form"] = self.get_form()
        kwargs["shoppinglist"] = self.shoppinglist
        kwargs["stock"] = self.shoppinglist.stock_owner
        return kwargs

    def get_success_url(self):
        self.kwargs.pop("shoppinglist_id", None)
        return reverse_lazy(
            "stock:shoppinglist_list", args=self.args, kwargs=self.kwargs
        )


class StockTakeItemsForm(forms.BaseForm):
    """
    docstring for StockTakeItemsFormView
    """

    def clean(self):
        with transaction.atomic():
            for k, t in self.cleaned_data.items():
                item_id = int(k[5:])
                if t > 0:
                    item = StockItem.objects.filter(id=item_id).first()
                    item.effective_quantity -= t
                    item.save()
        return self.cleaned_data


class StockTakeItemsBaseFormView(
    CounterTabsMixin, CanEditMixin, DetailView, BaseFormView
):
    """
    docstring for StockTakeItemsBaseFormView
    """

    model = StockItem
    template_name = "stock/stock_take_items.jinja"
    pk_url_kwarg = "stock_id"
    current_tab = "take_items_from_stock"

    def get_form_class(self):
        fields = OrderedDict()
        kwargs = {}
        for t in ProductType.objects.order_by("name").all():
            for i in self.stock.items.filter(type=t).order_by("name").all():
                field_name = "item-%s" % (str(i.id))
                fields[field_name] = forms.IntegerField(
                    required=False,
                    label=str(i),
                    initial=0,
                    min_value=0,
                    max_value=i.effective_quantity,
                    help_text=_(
                        "%(effective_quantity)s left"
                        % {"effective_quantity": str(i.effective_quantity)}
                    ),
                )
                kwargs[field_name] = i.effective_quantity
        kwargs["stock_id"] = self.stock.id
        kwargs["counter_id"] = self.stock.counter.id
        kwargs["base_fields"] = fields
        return type("StockTakeItemsForm", (StockTakeItemsForm,), kwargs)

    def get(self, request, *args, **kwargs):
        """
        Simple get view
        """
        self.stock = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        return super(StockTakeItemsBaseFormView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        """
        Handle the many possibilities of the post request
        """
        self.object = self.get_object()
        self.stock = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        if self.stock.counter.type == "BAR" and not (
            "counter_token" in self.request.session.keys()
            and self.request.session["counter_token"] == self.stock.counter.token
        ):  # Also check the token to avoid the bar to be stolen
            return HttpResponseRedirect(
                reverse_lazy(
                    "counter:details",
                    args=self.args,
                    kwargs={"counter_id": self.stock.counter.id},
                )
                + "?bad_location"
            )
        return super(StockTakeItemsBaseFormView, self).post(request, *args, **kwargs)

    def form_valid(self, form):
        return super(StockTakeItemsBaseFormView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        kwargs = super(StockTakeItemsBaseFormView, self).get_context_data(**kwargs)
        if "form" not in kwargs.keys():
            kwargs["form"] = self.get_form()
        kwargs["stock"] = self.stock
        kwargs["counter"] = self.stock.counter
        return kwargs

    def get_success_url(self):
        stock = Stock.objects.filter(id=self.kwargs["stock_id"]).first()
        self.kwargs["counter_id"] = stock.counter.id
        self.kwargs.pop("stock_id", None)
        return reverse_lazy("counter:details", args=self.args, kwargs=self.kwargs)