import json
import sys
from django.http import HttpResponse
from django.template import loader
from django.shortcuts import render, redirect
from .form import *


def get_class(classname):
    """
    Retrieve a class object by its name.

    :param classname: Name of the class to retrieve.
    :return: The class object with the given name.
    """
    return getattr(sys.modules[__name__], classname)


def index(request):
    return render(request, 'ugssim/home.html')


def planungsparameter(request):
    """
       Die Erzeugung der Webformulare soll dynamisch auf Basis der Model und Form Klassen
       geschehen.
       Dafür wird eine Liste mit den Klassennamen der Models angelegt über die iteriert wird
       über die Funktion get_class(classname) erhält man die Klassenobjekte
            modelclass für das Model
            formclass für das Formular
       über diese wird dann iterierter.
    """

    """
    Anleitung für Nutzerdatenlogin und anzeigen
    https://github.com/OmiDevProjects/show-only-the-data-of-the-user-that-is-logged-in/blob/master/home/views.py
    """

    formlist = {}
    modellist = ['Address', 'Summary', 'Company']
    for modelname in modellist:
        modelclass = get_class(modelname)
        formclass = get_class(modelname + 'Form')
        if request.method == "POST":
            """
            if modelname + 'Button' in request.POST:
                form = formclass(request.POST)
                # form.fields.pop('description')
                if form.is_valid():
                    modelclass.objects.update(**form.cleaned_data)
                    form = formclass(request.POST)
            else:
                form = formclass()
            """
            form = formclass()
        else:
            try:
                dict = modelclass.objects.filter(user=request.user).values().first()
                form = formclass(initial=dict)
            except Exception as e:
                form = formclass()
        formpart = {
            'modelname': modelname,
            'form': form,
            'heading': form.heading,
            'description': form.description
        }
        formlist.update({modelname + "form": formpart})

    context = {
        'formlist': formlist
    }

    return render(request, 'planungsparameter/planungsparameter.html', context)


def save_planungsparameter(request):
    """
    Save the form data for planungsparameter.

    :param pk:
    :param request: The HTTP request object.
    :return: HttpResponse object.
    """


    if request.method == "POST":
        if request.headers.get('X-Requested-With') == 'XMLHttpRequest':

            # Load Body
            body = json.loads(request.body.decode('utf-8'))
            # Form Data
            data = body['data']
            # Modelname
            modelName = body['modelName']
            # Get Classes
            formclass = get_class(modelName+'Form')
            modelclass = get_class(modelName)
            form_instance=User.objects.get(id=request.user.id)
            form = formclass(data,instance=form_instance)
            # Check User ID
            user_id = request.user.id
            try:
                form_user_id = int(data['user'])
            except Exception as ex:
                return redirect('logout')
            if form_user_id != user_id:
                return redirect('logout')
            else:
                if modelclass.objects.filter(pk=form_user_id).exists():
                    # Update Database
                    # form.initial['user'] = 1
                    if form.is_valid():
                        for key,value in form.cleaned_data.items():
                            # print(key, value)
                            modelclass.objects.filter(pk=form_user_id).update(**{key:value})
                        return HttpResponse("Form data updates successfully.")
                else:
                    if form.is_valid():
                        modelclass.objects.create(**form.cleaned_data)
                        return HttpResponse("Form data saved successfully.")

    return HttpResponse("Form data NOT saved.")