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python -m venv <myenv> 
source myenv/bin/activate # On Windows use `myenv\Scripts\activate`

pip install django
# Create new django project
django-admin startproject blog_app
cd blog_app

# Either of the two
django-admin startapp user
python manage.py startapp user

# user/forms.py
from django.contrib.auth.forms import AuthenticationForm, UserCreationForm
from django.forms.widgets import PasswordInput, TextInput
from django.forms.fields import EmailField
from django import forms


class LoginForm(AuthenticationForm):
    username = forms.CharField(widget=TextInput())
    password = forms.CharField(widget=PasswordInput())


class SignUpForm(UserCreationForm):
    username = forms.CharField(max_length=150, required=True)
    email = forms.EmailField(required=True)
    password1 = forms.CharField(widget=forms.PasswordInput, required=True)
    password2 = forms.CharField(widget=forms.PasswordInput, required=True)

    def save(self, commit=True):
        user = super().save(commit=False)
        user.email = self.cleaned_data["email"]
        if commit:
            user.save()
        return user

# user/views.py
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from django.contrib.auth import logout, authenticate, login
from .forms import *
from django.contrib.auth.models import auth

# I use the decorator `login_required` in order for the application to navigate to the login page if the user has not login or sign up yet.
@login_required
def homeView(request):
    return render(request, "home.html")

def loginView(request):
    '''
    First, I initialized my custom LoginForm then it will check the request of the user. 
    The user will then input it's username and password. Then it will check if the form is valid then it will get the user's input credential and it will authenticate it by using the built-in Django `authenticate` method. It will then check if the user correctly input it's credential and it will call the `login` method of Django and redirect the user to the homepage.
    '''
    form = LoginForm()
    if request.method == "POST":
       form = LoginForm(request, data=request.POST)
        if form.is_valid():
            username = request.POST.get("username")
            password = request.POST.get("password")
            user = authenticate(request, username=username, password=password)
            if user is not None:
                auth.login(request, user)
                return redirect("user:home")
    return render(request, "login.html", {"form": form})

def signupView(request):
    '''
    We will get the request from the user and check if the form is valid the we wills ave the user information in our SignUpForm
    '''
    if request.method == "POST":
        form = SignUpForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect("user:login")
    else:
        form = SignUpForm()
    return render(request, "signup.html", {"form": form})

def logoutView(request):
    '''
    I use the Django built-in `logout` method to logut the user
    '''
    logout(request)
    return redirect("user:login")

# blog_app/urls.py
from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path("", include("user.urls", "user")),
    path("admin/", admin.site.urls),
]

# user/urls.py
from django.urls import path, include
from .views import *

app_name = "user"

urlpatterns = [
    path("", homeView, name="home"),
    path("signup/", signupView, name="sign-up"),
    path("login/", loginView, name="login"),
    path("logout/", logoutView, name="logout"),
]