import logging
from django.shortcuts import render
from django.contrib.auth import authenticate, login
from django.shortcuts import redirect, render
from system.models import Users
from django.urls import reverse_lazy
from django.contrib.auth.backends import ModelBackend
from django.db.models import Q
from system.form import UserPasswordForm
from django.contrib.auth.mixins import LoginRequiredMixin, PermissionRequiredMixin
from django.contrib.auth.decorators import login_required
from django.views.generic import ListView, View, DetailView, CreateView, UpdateView
from django.contrib.auth import logout

logger = logging.getLogger('system')


class CustomBackend(ModelBackend):

    """
    用户名字/邮箱名字 登录
    :param request:
    :return:
    """

    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            user = Users.objects.get(Q(username=username) | Q(email=username))
            if user.check_password(password):
                return user
        except Exception as e:
            logger.error(e)
            return None


def login_view(request):
    """
    登录
    :param request: username,password
    :return:
    """

    error_msg = "用户名或密码错误,或者被禁用,请重试"

    if request.method == "GET":
        return render(request, 'system/login.html', {'error_msg': error_msg, })

    if request.method == "POST":
        u = request.POST.get("username")
        p = request.POST.get("password")
        user = authenticate(request, username=u, password=p)
        if user is not None:
            if user.is_active:
                login(request, user)
                request.session['is_login'] = True
                login_ip = request.META['REMOTE_ADDR']
                return redirect('/index')
            else:
                return render(request, 'system/login.html', {'error_msg': error_msg, })
        else:
            return render(request, 'system/login.html', {'error_msg': error_msg, })



@login_required(login_url="/system/login")
def index(request):
    """
    首页
    :param request:
    :return:
    """
    return render(request, 'system/index.html')




class UserPasswordUpdateView(LoginRequiredMixin, UpdateView):
    """
    修改密码
    :param request:
    :return:
    """
    template_name = 'system/password.html'
    model = Users
    form_class = UserPasswordForm
    success_url = reverse_lazy('system:logout')

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

    def get_context_data(self, **kwargs):
        return super().get_context_data(**kwargs)

    def get_success_url(self):
        return super().get_success_url()


def logout_view(request):
    """
    注销
    :param request:
    :return:
    """
    logout(request)
    return redirect('system:login')


class DisableCSRFCheck(object):
    def process_request(self, request):
        setattr(request, '_dont_enforce_csrf_checks', True)