from django.shortcuts import render
from django.views import View 

# Create your views here.
from django.http import HttpResponse
from django.contrib.auth.models import User
from django.db.models.query import QuerySet

from .status_code import *
from .settings import *

class Login(View):
    def get(self, request):
        return render(request, "login.html")
    
    def post(self, request):
        username = request.POST.get("username")
        if (username == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        password = request.POST.get("password")
        if (password == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        query: QuerySet = User.objects.filter(username=username)
        if (not query.exists()):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        user: User = User.objects.get(username=username)
        if (not user.check_password(password)):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        return HttpResponse(USER_VALID)

class Register(View):
    def get(self, request):
        return render(request, "register.html") 

    def post(self, request):
        password = request.POST.get("password")
        if (password == None or not PASSWORD_MAX_SIZE >= len(password) >= PASSWORD_MIN_SIZE):
            return HttpResponse(INVALID_PASSWORD)
        username = request.POST.get("username")
        if (username == None or not USERNAME_MAX_SIZE >= len(username) >= USERNAME_MIN_SIZE):
            return HttpResponse(INVALID_USERNAME)
        
        if User.objects.filter(username=username).exists():
            return HttpResponse(USERNAME_ALREADY_USED)
        
        user = User.objects.create_user(username, password=password)
        user.save()
        
        return HttpResponse(USER_ADDED)

class Delete(View):
    def get(self, request):
        return render(request, "delete.html")
    
    def post(self, request):
        username = request.POST.get("username")
        if (username == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        password = request.POST.get("password")
        if (password == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        query: QuerySet = User.objects.filter(username=username)
        if (not query.exists()):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        user: User = User.objects.get(username=username)
        if (not user.check_password(password)):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        user.delete()
        
        return HttpResponse(USER_DELETED)
    
class ChangePassword(View):
    def get(self, request):
        return render(request, "change_password.html")
    
    def post(self, request):
        username = request.POST.get("username")
        if (username == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        current_password = request.POST.get("current_password")
        if (current_password == None):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        query: QuerySet = User.objects.filter(username=username)
        if (not query.exists()):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        user: User = User.objects.get(username=username)
        if (not user.check_password(current_password)):
            return HttpResponse(INVALID_USERNAME_PASSWORD)
        
        new_password = request.POST.get("new_password")
        if (new_password == None or not PASSWORD_MAX_SIZE >= len(new_password) >= PASSWORD_MIN_SIZE):
            return HttpResponse(INVALID_PASSWORD)
        
        user.set_password(new_password)
        user.save()
        
        return HttpResponse(PASSWORD_UPDATED)