from django import forms
from django.contrib.auth import views as auth_views, password_validation
from django.contrib.auth.forms import UsernameField
from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.contrib import messages
from django.core.exceptions import PermissionDenied
from django.db.models import Q
from django.http import HttpResponseForbidden, HttpResponseRedirect
from django.views.generic import TemplateView
from django.views.generic.detail import DetailView
from django.views.generic.edit import CreateView, UpdateView
from django.views.generic.list import ListView
from django.urls import reverse, reverse_lazy
from django.utils.translation import gettext_lazy as _
from trading.models import User, Commodity, MaxCommodityError, TxRequest


class IndexView(LoginRequiredMixin, TemplateView):
    template_name = "trading/index.html"


################################################################################
# Commodity views
################################################################################

class CommodityDetailView(DetailView):
    template_name = "trading/c/detail.html"
    model = Commodity


class CommodityCreateView(LoginRequiredMixin, CreateView):
    template_name = "trading/c/create.html"
    model = Commodity
    fields = (
        "name",
        "in_circulation",
    )

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["object"] = self.request.user
        return context

    def form_valid(self, form):
        user = self.request.user
        if not user.can_create_commodity():
            raise MaxCommodityError(user)
        form.instance.created_by = user
        return super(CreateView, self).form_valid(form)


################################################################################
# Tx views
################################################################################

class TxRequestDetailView(DetailView):
    template_name = "trading/t/detail.html"
    model = TxRequest

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        tx = context["object"]
        if self.request.user == tx.source:
            context["sent"] = tx.source_sends
            context["sent_amount"] = tx.source_amount
            context["received"] = tx.dest_sends
            context["received_amount"] = tx.dest_amount
        else:
            context["sent"] = tx.dest_sends
            context["sent_amount"] = tx.dest_amount
            context["received"] = tx.source_sends
            context["received_amount"] = tx.source_amount
        return context


class TxRequestListView(LoginRequiredMixin, ListView):
    template_name = "trading/t/list.html"
    model = TxRequest
    paginate_by = 100

    def get_queryset(self):
        user = self.request.user
        return TxRequest.objects.filter(Q(source=user) | Q(dest=user)).order_by("-pk")


################################################################################
# User views
################################################################################

class UserProfileView(DetailView):
    template_name = "trading/u/profile.html"
    model = User

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        if self.object.is_active:
            status = "Active"
        else:
            status = "Inactive"
        context["object_status"] = status
        return context


class UserUpdateSettingsForm(forms.ModelForm):
    class Meta:
        model = User
        fields = (
            "username",
            "email",
        )
        field_classes = {"username": UsernameField}

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


class UserSettingsView(LoginRequiredMixin, UpdateView):
    template_name = "trading/account/settings.html"
    model = User
    fields = ("username", "email")
    success_url = reverse_lazy("trading:settings")

    def get_object(self, queryset=None):
        return self.request.user