from .models import Article
from django.shortcuts import render
from django.http import Http404, HttpResponse
from django.shortcuts import redirect
from django.contrib.auth.models import User
from django.contrib.auth import authenticate, login, logout

def archive(request):
    return render(request, 'archive.html', {"posts": Article.objects.all()})

def get_article(request, article_id):
    try:
        post = Article.objects.get(id=article_id)
        return render(request, 'article.html', {"post": post, "user": request.user})
    except Article.DoesNotExist:
        raise Http404

def create_post(request):
    if request.method == "POST":
            form = {
                'text': request.POST["text"], 'title': request.POST["title"]
            }
            if form["text"] and form["title"]:
                print('try')
                try:
                    article = Article.objects.create(text=form["text"], title=form["title"], author=request.user)
                    return redirect('get_article', article_id=article.id)
                except:
                    return render(request, 'article_invalid_name.html')
            else:
                return render(request, 'new_article.html', {'form': form, 'error': 'Введите название и текст статьи!'})

    if not request.user.is_anonymous:
        return render(request, 'new_article.html')
    else:
        return HttpResponse('Unauthorized', status=401)

def registration(request):
    if request.method == "POST":
        form = { 'username': request.POST["username"], 'email': request.POST["email"], 'password': request.POST["password"] }
        username = request.POST.get("username", "").strip()
        email = request.POST.get("email", "").strip()
        password = request.POST.get("password", "").strip()
        if not username or not email or not password:
            return render(request, 'registration.html', {'error': 'Все поля обязательны для заполнения.', 'form': form})

        if len(password) < 6:
            return render(request, 'registration.html', {'error': 'Пароль должен содержать не менее 6 символов.', 'form': form})

        if User.objects.filter(username=username).exists():
            return render(request, 'registration.html', {'error': 'Пользователь с таким именем уже существует.', 'form': form})

        if User.objects.filter(email=email).exists():
            return render(request, 'registration.html', {'error': 'Этот email уже используется.', 'form': form})

        if "@" not in email or "." not in email:
            return render(request, 'registration.html', {'error': 'Некорректный формат email.', 'form': form})

        user = User.objects.create_user(username=username, email=email, password=password)
        user.save()
        return redirect('/login')
    return render(request, 'registration.html')

def login_page(request):
    if request.method == "POST":
        form = {'username': request.POST.get("username"), 'password': request.POST.get("password")}
        username = request.POST.get("username", "").strip()
        password = request.POST.get("password", "").strip()

        if not username or not password:
            return render(request, 'login.html', {'error': 'Введите имя пользователя и пароль.', 'form': form})

        user = authenticate(request, username=username, password=password)

        if user is None:
            return render(request, 'login.html', {'error': 'Неверное имя пользователя или пароль.', 'form': form})

        login(request, user)
        return redirect('/')
    return render(request, 'login.html')

def user_logout(request):
    logout(request)
    return redirect('/')