#!/usr/bin/env python3
"""
/signup app views.
"""
# TODO: make unique username validation be case insensitive
import random
import string

from django.shortcuts import redirect, render
from django.core.mail import send_mail
from django.urls import reverse
from django.conf import settings

from .forms import SignupForm
from .models import Confirmation

def index(request):
	"""
	The signup page.
	"""
	if request.user.is_authenticated:
		return redirect('homepage:index')
	if request.method == 'POST':
		form = SignupForm(request.POST)
		if form.is_valid():
			user = form.save()
			confirm = Confirmation(
				user=user,
				code=get_code(32)
			)
			confirm.save()
			verify_url = request.build_absolute_uri(reverse('signup:verify'))
			verify_url = verify_url.replace("http", "https")
			email_confirmation(confirm, verify_url)
			return render(request, 'signup/confirmation_sent.html', locals())
	else:
		form = SignupForm()
	return render(request, 'signup/index.html', {'form': form})


def get_code(n):
	"""
	Helper function to generate n number of psudeo-random ASCII characters.
	"""
	chars = []
	for _ in range(n):
		chars.append(random.choice(string.ascii_letters + string.digits))
	return "".join(chars)


def email_confirmation(confirm, verify_url):
	"""
	Sends out a confirmation to the user.
	"""
	message = "Please use the following link to verify your account: "
	message += verify_url + "?code=" + confirm.code
	send_mail(
		"Email verification",
		message,
		settings.DEFAULT_FROM_EMAIL,
		[confirm.user.email],
	)


def verify(request):
	"""
	Verifies and activates the user's account.
	"""
	code = request.GET.get("code")
	if not code:
		return redirect('homepage:index')
	try:
		confirm = Confirmation.objects.get(code=code)
	except Confirmation.DoesNotExist:
		return redirect('homepage:index')
	user = confirm.user
	user.is_active = True
	user.save()
	confirm.delete()
	return render(request, 'signup/confirmed.html', locals())