from django.contrib.auth import authenticate, login
from django.http import HttpResponseRedirect
from django.shortcuts import render
from django.urls import reverse
import json
import requests
import secrets
import datetime

def login_view(request):
    if request.method == "POST":
        # Attempt to sign user in
        username = request.POST["username"]
        password = request.POST["password"]
        user = authenticate(request, username=username, password=password)

        # Check if authentication successful
        if user is not None:
            login(request, user)
            return HttpResponseRedirect(reverse("index"))
        else:
            return render(request, "network/login.html", {
                "message": "Invalid username and/or password."
            })
    # Check if request was sent from Services
    if request.GET.get('services'):
        return auth_user(request, request.GET['services'])
    
    return render(request, "network/login.html")


def auth_user(request, services_token):
    # Endpoint to the services API
    if services_token:
        endpoint = f"http://serwwwices.com/api/authorization/{services_token}"
    else:
        return HttpResponseRedirect(reverse('index'))
    
    # Authorization token. Keep it in environment variables.
    auth_token_from_panel= '<authorization_token_generated_in_panel>'
    headers = {
        'Authorization': f"Bearer {auth_token_from_panel}"
    }

    get_response = requests.get(endpoint, headers=headers)
    if get_response.ok:
        # A user email form services API.
        email = json.loads(get_response.content).get('internal_email_address', None)
        midnight = datetime.datetime.combine(datetime.datetime.today() + datetime.timedelta(days=1), datetime.time.min)

        try:
            user = User.objects.get(email=email)
        except User.DoesNotExist:
            user = User.objects.create_user(f"username_{email.split('@')[0]}_{round(datetime.datetime.now().timestamp())}", email, f"{secrets.token_hex(32)}")
            user.save()

        login(request, user)
        response = HttpResponseRedirect(reverse('index'))
        response.set_cookie('services', 'services_cookie', max_age=(midnight - datetime.datetime.now()).seconds)
        return response
    
    return HttpResponseRedirect(reverse('index'))