import uuid
from django.core.files import File
from django.http import JsonResponse, Http404
from django.shortcuts import render, redirect
from .form import RegisterForm, LoginForm, CreateForm, AnswerForm
from .models import CyberUser, Question, Choice
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.decorators import login_required


# Create your views here.

def home(request):
    content = {'user': request.user}
    return render(request, 'home.html', content)


def register(request):
    if request.method == 'GET':
        return render(request, 'register.html', {'form': RegisterForm()})
    elif request.method == 'POST':
        form = RegisterForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            nickname = form.cleaned_data['nickname']
            password = form.cleaned_data['password1']
            email = form.cleaned_data['email']
            username_exist = CyberUser.objects.filter(username=username).exists()
            if username_exist:
                return JsonResponse({"code": 400,
                                     "message": "验证失败",
                                     "data": {"username": "",
                                              "password1": "",
                                              "password2": "",
                                              "email": "",
                                              },
                                     })
            CyberUser.objects.create_user(
                username=username,
                nickname=nickname,
                password=password,
                email=email,
            )
            return JsonResponse({"code": 200,
                                 "message": "验证通过，已注册",
                                 "data": {"username": "",
                                          "password1": "",
                                          "password2": "",
                                          "email": "",
                                          },
                                 })
        else:
            return JsonResponse({"code": 400, "message": "验证失败", "data": {"username": form.errors.get("username"),
                                                                              "password1": form.errors.get("password1"),
                                                                              "password2": form.errors.get("password2"),
                                                                              "email": form.errors.get("email")}})
    else:
        raise Http404


def login_view(request):
    if request.method == 'GET':
        return render(request, 'login.html', {'form': LoginForm()})
    elif request.method == 'POST':
        form = LoginForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            password = form.cleaned_data['password']
            user = authenticate(request, username=username, password=password)
            if user and user.is_active:
                login(request, user)
                request.session['username'] = username
                request.session.set_expiry(1800)
                return JsonResponse(
                    {
                        "code": 200,
                        "message": '登陆成功',
                        "data": username,
                    }
                )
            elif user and user.is_active:
                return JsonResponse(
                    {
                        "code": 400,
                        "message": "用户状态错误，请联系管理员修正",
                        "data": "user is not active",
                    }
                )
            else:
                return JsonResponse(
                    {
                        "code": 400,
                        "message": "用户名或密码错误",
                        "data": None,
                    }
                )
        else:
            return JsonResponse(
                {
                    "code": 400,
                    "message": "验证失败，用户名或密码格式错误",
                    "data": form.errors.get(),
                }
            )
    else:
        raise Http404


def logout_view(request):
    logout(request)
    return redirect('/exam/login')


@login_required
def create_question(request):
    if request.method == 'GET':
        return render(request, 'create.html', {'form': CreateForm})
    elif request.method == 'POST':
        form = CreateForm(request.POST, request.FILES)
        if form.is_valid():
            text = form.cleaned_data['text']
            image = form.cleaned_data['image']
            a = form.cleaned_data['a']
            b = form.cleaned_data['b']
            c = form.cleaned_data['c']
            d = form.cleaned_data['d']
            answer = form.cleaned_data['answer']
            new_question = Question(
                question_text=text,
                choice_a=a,
                choice_b=b,
                choice_c=c,
                choice_d=d,
                answer=answer,
            )
            if image:
                new_question.image = File(image, name=f'{str(uuid.uuid4())}.jpg')
            new_question.save()
            return JsonResponse(
                {
                    'code': 200,
                    'message': 'success',
                    'data': '',
                }
            )
        else:
            return JsonResponse(
                {
                    'code': 400,
                    'message': '参数不正确',
                    'data': form.errors
                }
            )


@login_required
def get_question(request):
    user = request.user
    question = Question.objects.exclude(choice__user=user).order_by('?').first()
    return render(request, "question.html", {'question': question, 'form': AnswerForm, 'user': request.user})


@login_required
def answer(request):
    if request.method == 'POST':
        form = AnswerForm(request.POST)
        if form.is_valid():
            user = request.user
            user_ans = form.cleaned_data['answer']
            questionID = form.cleaned_data['questionID']
            question = Question.objects.get(uid=questionID)
            if Choice.objects.filter(user=user, question=question).exists():
                return JsonResponse(
                    {
                        'code': 200,
                        'message': '该问题已经回答过了',
                        'data': '',
                    }
                )
            choice = Choice(user=user, question=question, choice=user_ans)
            choice.save()
            if user_ans == question.answer:
                user.score = user.score + 1
                user.save()
            return JsonResponse(
                {
                    'code': 200,
                    'message': 'success',
                    'data': {'correction': user_ans == question.answer},
                }
            )
        else:
            return JsonResponse(
                {
                    'code': 400,
                    'message': '参数错误',
                    'data': '表单不可用',
                }
            )
    else:
        return Http404