from django.shortcuts import render,redirect
from django.contrib.auth.models import User
from django.contrib import auth

# Create your views here.
def signup(request):
    if request.method =='POST':
        if request.POST['password1'] == request.POST['password2']:
            try:
                user=User.objects.get(username=request.POST['username'])
                return render(request,'signup.html',{'error':'Username has been already taken '})
            except User.DoesNotExist:
                user=User.objects.create_user(request.POST['username'],password=request.POST['password1']) 
                auth.login(request,user)
                return redirect('home')   
        else:
            return render(request,'signup.html',{'error':'Passwords must match'})


    else:
        return render(request,'signup.html')

def login(request):
    if request.method =='POST':
        user=auth.authenticate(username=request.POST['username'],password=request.POST['password'])
        if user is not None:
            auth.login(request,user)
            return redirect('home')
        else:
            return render(request,'login.html', {'error':'username or password is invalid.'})    
    else:
        return render(request,'login.html')

def logout(request):
    if request.method =='POST':
        auth.logout(request)
        return redirect('home')