from urllib.parse import urlparse
from django.shortcuts import render, redirect
from django.http import Http404, HttpResponse
from django.db.models import F
from django.contrib import messages
from .models import Link, LinkForm


def get_client_ip(request):
    x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
    if x_forwarded_for:
        ip = x_forwarded_for.split(',')[0]
    else:
        ip = request.META.get('REMOTE_ADDR')
    return ip


def catchall(request, id):
    try:
        link = Link.objects.get(id=id)
        parsed = urlparse(link.url)
        Link.objects.filter(id=id).update(clicks=F('clicks')+1)
        if parsed.scheme:
            return redirect(link.url)
        return redirect("http://" + link.url)
    except Exception as e:
        return  HttpResponse(e)
        parsed = urlparse(id)
        if parsed.netloc:
            link = Link(url=id, ip=get_client_ip(request))
            link.save()
            request.session['short_url'] = "http://" + str(request.get_host()) + "/" + str(link.id)
            return redirect('/')
    raise Http404("Link does not exist")


def home(request):
    context = {'form': LinkForm}
    if 'short_url' in request.session and request.session['short_url']:
        context['short_url'] = request.session['short_url']
        request.session['short_url'] = None
    if 'url' in request.POST:
        link = Link(url=request.POST['url'], ip=get_client_ip(request))
        link.save()
        request.session['short_url'] = "http://" + request.get_host() + "/" + link.id
        return redirect('/')
    return render(request, 'index.html', context)