from django.utils import timezone
import uuid
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.urls import reverse
from django.contrib import messages
from .models import QivipQuiz, QivipQuestion, QivipQuizFavorite, QuestionImage, QuizImage
from .forms import QuizForm, QuestionForm
import json
from django.core.paginator import Paginator
from .models import QivipQuiz
from .forms import QuizFilterForm
from django.db.models import Count
from django.contrib.auth.models import User
from urllib.parse import urlparse, urlunparse
# Übersicht aller Quizze

from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle
from reportlab.lib import colors
from django.http import HttpResponse
import json
from datetime import datetime
from reportlab.platypus import Image

from reportlab.lib import colors
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle, HRFlowable
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.pagesizes import A4
from django.http import HttpResponse
from django.shortcuts import get_object_or_404
import json
from io import BytesIO
import requests
from django.core.files.storage import default_storage
from PIL import Image as PILImage,  ImageOps
from django.conf import settings
import os
from django.utils.html import escape

def pdf_solution(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk)
    
    questions = QivipQuestion.objects.filter(quiz_id=quiz)

    for question in questions:
        if question.data:
            question.data = json.loads(question.data)

    response = HttpResponse(content_type='application/pdf')
    response['Content-Disposition'] = f'attachment; filename="Lösungen - {quiz.name}.pdf"'

    doc = SimpleDocTemplate(response, pagesize=A4,
                            rightMargin=40, leftMargin=40,
                            topMargin=60, bottomMargin=60)

    styles = getSampleStyleSheet()

    # Stil für Quiz-Titel
    title_style = ParagraphStyle(
        'TitleStyle',
        parent=styles['Title'],
        alignment=1,  # zentriert
        fontSize=14,
        spaceAfter=2,
    )

    # Stil für Fragen-Box
    question_box_style = ParagraphStyle(
        'QuestionBox',
        fontSize=10,
        leading=16,
        fontName='Helvetica-Bold',
       
       
        spaceAfter=8,
        leftIndent=6,
        rightIndent=6,

        alignment=0
    )

    # Stil für Antwort (richtig)
    answer_correct_style = ParagraphStyle(
        'AnswerCorrect',
        fontSize=11,
        leading=14,
        textColor=colors.green,
        leftIndent=20,
        spaceAfter=4,
    )

    # Stil für Antwort (falsch)
    answer_wrong_style = ParagraphStyle(
        'AnswerWrong',
        fontSize=11,
        leading=14,
        textColor=colors.red,
        leftIndent=20,
        spaceAfter=4,
    )

    # Stil für normalen Antwort-Text (ohne Antwortanzeige)
    answer_neutral_style = ParagraphStyle(
        'AnswerNeutral',
        fontSize=11,
        leading=14,
        textColor=colors.black,
        leftIndent=20,
        spaceAfter=4,
    )
    date_style = ParagraphStyle(
    name='RightAligned',
    parent=styles['Normal'],
    alignment=2,
)

    story = []

    story.append(Paragraph(f"Quiz: {quiz.name}", title_style))
    story.append(Paragraph(f"- Lösungen -", title_style))
    story.append(Spacer(1, 20))

    story.append(Paragraph(datetime.today().strftime("%d.%m.%Y"),  date_style))
    story.append(Spacer(1, 20))

    if quiz.description:
        story.append(Paragraph(quiz.description, styles['Normal']))
        story.append(Spacer(1, 20))
    


    for i, question in enumerate(questions, start=1):
        data = question.data
        frage_text = data.get('question', 'Frage nicht gefunden.')

        story.append(Paragraph(f"Frage {i}: {frage_text}", question_box_style))
        story.append(Spacer(1, 6))

        rl_image = None
        if hasattr(question, 'image') and question.image and question.image.image:
            image_url = request.build_absolute_uri(question.image.image.url)
            img_response = requests.get(image_url)
            if img_response.status_code == 200:
                image_data = BytesIO(img_response.content)
                pil_image = PILImage.open(image_data)
                pil_image = ImageOps.exif_transpose(pil_image)
                orig_width, orig_height = pil_image.size
                max_width = 80
                max_height = 80
                ratio = min(max_width / orig_width, max_height / orig_height)
                new_width = orig_width * ratio
                new_height = orig_height * ratio
                output = BytesIO()
                pil_image.save(output, format='JPEG')
                output.seek(0)

                rl_image = Image(output, width=new_width, height=new_height)

        options = data.get('options', [])
        answer_paragraphs = []
        for idx, option in enumerate(options, start=1):
            opt_text = option.get('value', '')
            if option.get('is_correct', False):
                text = f"✔ {opt_text}"
                style = answer_correct_style
            else:
                text = f"✘ {opt_text}"
                style = answer_wrong_style
            answer_paragraphs.append(Paragraph(text, style))

        if rl_image:
        # Tabelle mit Bild links und Antworten rechts
         from reportlab.platypus import Table, TableStyle
         from reportlab.lib.units import cm
         data_table = [[rl_image, answer_paragraphs]]
         table = Table(data_table, colWidths=[6*cm, 10*cm])
         table.setStyle(TableStyle([
            ('VALIGN', (0,0), (-1,-1), 'TOP'),
            ('LEFTPADDING', (0,0), (-1,-1), 0),
            ('RIGHTPADDING', (0,0), (-1,-1), 10),
        ]))
         story.append(table)
        else:
        # Kein Bild, Antworten einfach nacheinander
            for p in answer_paragraphs:
                story.append(p)

        story.append(Spacer(1, 12))
        story.append(HRFlowable(width="100%", thickness=1, color=colors.grey))
        story.append(Spacer(1, 12))
    current_url = request.build_absolute_uri(f"/library/detail/{quiz.pk}/")
    escaped_url = escape(current_url)  # Sicherheitshalber escapen

    link_html = f'<a href="{escaped_url}" color="blue">{escaped_url}</a>'
    story.append(Paragraph(link_html, styles['Normal']))
    

    doc.build(story)
    return response
def pdf_task(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk)
    questions = QivipQuestion.objects.filter(quiz_id=quiz)

    for question in questions:
        if question.data:
            question.data = json.loads(question.data)

    response = HttpResponse(content_type='application/pdf')
    response['Content-Disposition'] = f'attachment; filename="Aufgabenblatt - {quiz.name}.pdf"'

    doc = SimpleDocTemplate(response, pagesize=A4,
                            rightMargin=40, leftMargin=40,
                            topMargin=60, bottomMargin=60)

    styles = getSampleStyleSheet()

    title_style = ParagraphStyle(
        'TitleStyle',
        parent=styles['Title'],
        alignment=1,
        fontSize=14,
        spaceAfter=2,
        fontName='Helvetica-Bold',
    )

    question_box_style = ParagraphStyle(
        'QuestionBox',
        fontSize=10,
        leading=16,
        fontName='Helvetica-Bold',
        spaceAfter=8,
        leftIndent=6,
        rightIndent=6,
        alignment=0
    )

    

    answer_neutral_style = ParagraphStyle(
        'AnswerNeutral',
        fontSize=11,
        leading=14,
        textColor=colors.black,
        leftIndent=20,
        spaceAfter=4,
    )

    date_style = ParagraphStyle(
        name='RightAligned',
        parent=styles['Normal'],
        alignment=2,
    )
    
    name_style = ParagraphStyle(
        name='RightAligned',
        parent=styles['Normal'],
        alignment=0,
    )
    story = []

    # Titel & Datum
    story.append(Paragraph(f"Aufgabenblatt: {quiz.name}", title_style))
    story.append(Spacer(1, 20))
    story.append(Paragraph(datetime.today().strftime("%d.%m.%Y"), date_style))
    story.append(Spacer(1, 20))
    story.append(Paragraph("Name: ", name_style))
    story.append(Spacer(1, 20))

    if quiz.description:
        story.append(Paragraph(quiz.description, styles['Normal']))
        story.append(Spacer(1, 20))

    for i, question in enumerate(questions, start=1):
        data = question.data
        frage_text = data.get('question', 'Frage nicht gefunden.')
        story.append(Paragraph(f"Frage {i}: {frage_text}", question_box_style))
        story.append(Spacer(1, 6))

        rl_image = None
        if hasattr(question, 'image') and question.image and question.image.image:
            image_url = request.build_absolute_uri(question.image.image.url)
            img_response = requests.get(image_url)
            if img_response.status_code == 200:
                image_data = BytesIO(img_response.content)
                pil_image = PILImage.open(image_data)
                pil_image = ImageOps.exif_transpose(pil_image)
                orig_width, orig_height = pil_image.size
                max_width = 80  # gleich wie bei Lösungen
                max_height = 80
                ratio = min(max_width / orig_width, max_height / orig_height)
                new_width = orig_width * ratio
                new_height = orig_height * ratio
                output = BytesIO()
                pil_image.save(output, format='JPEG')
                output.seek(0)
                rl_image = Image(output, width=new_width, height=new_height)

        options = data.get('options', [])

        answer_paragraphs = []
        for idx, option in enumerate(options, start=1):
            
            opt_text = option.get('value', '')
            if data.get("type") !="input":
                opt_text = option.get('value', '')
                answer_paragraphs.append(Paragraph(f"{idx}. {opt_text}", answer_neutral_style))
            else:
                story.append(Paragraph("Deine Antwort: ", answer_neutral_style))
                story.append(Spacer(1, 12))

        if rl_image:
            from reportlab.platypus import Table, TableStyle
            from reportlab.lib.units import cm
            data_table = [[rl_image, answer_paragraphs]]
            table = Table(data_table, colWidths=[6*cm, 10*cm])
            table.setStyle(TableStyle([
                ('VALIGN', (0,0), (-1,-1), 'TOP'),
                ('LEFTPADDING', (0,0), (-1,-1), 0),
                ('RIGHTPADDING', (0,0), (-1,-1), 10),
            ]))
            story.append(table)
        else:
            for p in answer_paragraphs:
                story.append(p)

        story.append(Spacer(1, 12))
        story.append(HRFlowable(width="100%", thickness=1, color=colors.grey))
        story.append(Spacer(1, 12))
        current_url = request.build_absolute_uri(f"/library/detail/{quiz.pk}/")
    escaped_url = escape(current_url)  # Sicherheitshalber escapen

    link_html = f'<a href="{escaped_url}" color="blue">{escaped_url}</a>'
    story.append(Paragraph(link_html, styles['Normal']))
    doc.build(story)
    return response




def quiz_names_json(request):
    form = QuizFilterForm(request.GET)
    if form.is_valid():
        search = form.cleaned_data.get('search')
    
    
        names = QivipQuiz.objects.all().annotate(max_amount_questions=Count('questions')).filter(max_amount_questions__gte=1, status='öffentlich', name__icontains=search)

    
    if request.user.is_authenticated:
        names = names | QivipQuiz.objects.filter(
        user_id=request.user.id,
        name__icontains=search
    )
        
    names=list(names.values_list('name', flat=True).distinct())
    
        
    return JsonResponse(names, safe=False)


def apply_quiz_filters(queryset, form):
    
    if not form.is_valid():
        return queryset
    queryset = queryset.annotate(question_count=Count('questions'))
    search = form.cleaned_data.get('search')
    username = form.cleaned_data.get('user')
    min_questions = form.cleaned_data.get('min_amount_questions')
    max_questions = form.cleaned_data.get('max_amount_questions')
    category = form.cleaned_data.get('categories')

    filters = {}

    if search:
        filters['name__icontains'] = search

    if min_questions is not None:
        filters['question_count__gte'] = min_questions

    if max_questions is not None:
        filters['question_count__lte'] = max_questions

     
    if category is not None:
        filters['category'] = category
 

    if username:
        try:
            user = User.objects.get(username=username)
            filters['user_id'] = user.id
        except User.DoesNotExist:
            return queryset.none()

    return queryset.filter(**filters)


def overview_quiz(request, connect="all"):
    form = QuizFilterForm(request.GET)

    user = request.user if request.user.is_authenticated else None

    # Meine Quizzeze mit mind. 1 Frage
    filter_my_quizzes = QivipQuiz.objects.none()
    if user:
        filter_my_quizzes = QivipQuiz.objects.annotate(max_amount_questions=Count('questions')).filter(
            user_id=user.id,
            max_amount_questions__gte=0
        )

    # Öffentliche Alle mit mind. 1 Frage
    filter_all_quizzes = QivipQuiz.objects.annotate(max_amount_questions=Count('questions')).filter(
        status='öffentlich',
        max_amount_questions__gte=1
    )
    if user:
        filter_all_quizzes = filter_all_quizzes.exclude(user_id=user.id)

    # Favoriten mit mind. 1 Frage
    favorite_quiz_ids = []
    favorite_quizzes = QivipQuiz.objects.none()
    if user:
        favorite_quiz_ids = QivipQuizFavorite.objects.filter(user=user, favorite=True).values_list('quiz', flat=True)
        favorite_quizzes = QivipQuiz.objects.annotate(max_amount_questions=Count('questions')).filter(
            id__in=favorite_quiz_ids,
            max_amount_questions__gte=1
        )

    # Suche anwenden, falls vorhanden


    filter_my_quizzes = apply_quiz_filters(filter_my_quizzes, form)
    filter_all_quizzes = apply_quiz_filters(filter_all_quizzes, form)
    favorite_quizzes = apply_quiz_filters(favorite_quizzes, form)
    if request.user.is_authenticated:
        filter_all_quizzes = apply_quiz_filters(filter_all_quizzes, form) | apply_quiz_filters(filter_my_quizzes, form)

    # Treffer zählen
    total_my = filter_my_quizzes.count()
    total_all = filter_all_quizzes.count()
    total_favorite = favorite_quizzes.count()

    total_all_found=total_my + total_all + total_favorite

    # Paginierung
    paginator_my = Paginator(filter_my_quizzes.order_by('-creation_date'), 8)
    paginator_all = Paginator(filter_all_quizzes.order_by('-published_at'), 8)
    paginator_fav = Paginator(favorite_quizzes.order_by('-published_at'), 8)

    my_page = request.GET.get('my_page', 1)
    all_page = request.GET.get('all_page', 1)
    fav_page = request.GET.get('favorite_page', 1)

    try:
        my_quizzes = paginator_my.page(my_page)
    except:
        my_quizzes = paginator_my.page(1)

    try:
        all_quizzes = paginator_all.page(all_page)
    except:
        all_quizzes = paginator_all.page(1)

    try:
        favorite_quizzes = paginator_fav.page(fav_page)
    except:
        favorite_quizzes = paginator_fav.page(1)

    context = {
        'form': form,
        'my_quizzes': my_quizzes,
        'all_quizzes': all_quizzes,
        'favorite_quizzes': favorite_quizzes,
        'total_my': total_my,
        'total_all': total_all,
        'total_favorite': total_favorite,
        'total_all_found':total_all_found,
        'show_search': True,
        'favorite_quiz_ids': list(favorite_quiz_ids),
        'url_my': '/library/my/',
        'url_all': '/library/',
        'url_favorite': '/library/favorites/',
    }

    query_params = request.GET.copy()

    querydict_my = query_params.copy()
    querydict_all = query_params.copy()
    querydict_fav = query_params.copy()

    # Entferne die jeweiligen Seiten-Parameter, damit wir sie neu setzen können
    querydict_my.pop('my_page', None)
    querydict_all.pop('all_page', None)
    querydict_fav.pop('favorite_page', None)

    # Füge die "bereinigten" Querystrings dem context hinzu
    context.update({
        'querystring_my': querydict_my.urlencode(),
        'querystring_all': querydict_all.urlencode(),
        'querystring_favorite': querydict_fav.urlencode(),
    })

    if connect=="all":
        context.update({"link":"library:overview_quiz"})
        return render(request, 'library/overview_quiz.html', context)
    elif connect=="my":
        context.update({"link":"library:overview_quiz_my"})
        return render(request, 'library/overview_quiz_my.html', context)
    elif connect=="favorite":
        context.update({"link":"library:overview_quiz_favorites"})
        return render(request, 'library/overview_quiz_favorite.html', context)


def overview_quiz_my(request):
    return overview_quiz(request, connect="my")
    

def overview_quiz_favorites(request):
    return overview_quiz(request, connect="favorite")
"""
def overview_quiz(request):
    # Filter
    form = QuizFilterForm(request.GET)
    try:
        favorite_quizzes_data = QivipQuizFavorite.objects.filter(user=request.user, favorite=True).order_by("-favorite_date")
        favorite_quiz_ids = favorite_quizzes_data.values_list('quiz', flat=True)
        favorite_quizzes = QivipQuiz.objects.filter(id__in=favorite_quiz_ids)
    except:
        favorite_quizzes_data = QivipQuizFavorite.objects.none()
        favorite_quizzes = QivipQuizFavorite.objects.none()
        favorite_quiz_ids = favorite_quizzes.none()
        favorite_quizzes = QivipQuiz.objects.none()

    # Initialize querysets
    if request.user.is_authenticated:
        filter_my_quizzes = QivipQuiz.objects.filter(user_id=request.user).annotate(max_amount_questions=Count('questions'))
        favorite_quizzes = favorite_quizzes.filter(id__in=favorite_quiz_ids).annotate(max_amount_questions=Count('questions'))
        filter_all_quizzes = QivipQuiz.objects.exclude(user_id=request.user)
    else:
        favorite_quizzes = QivipQuiz.objects.none()
        filter_my_quizzes = QivipQuiz.objects.none()
        filter_all_quizzes = QivipQuiz.objects.all()
    
    # Apply common filters to all quizzes
    filter_all_quizzes = filter_all_quizzes.annotate(max_amount_questions=Count('questions'))
    filter_all_quizzes = filter_all_quizzes.filter(max_amount_questions__gte=1, status='öffentlich')

    if form.is_valid():
        
        search = form.cleaned_data.get('search')
        username= form.cleaned_data.get('user')
        max_amount_questions= form.cleaned_data.get('max_amount_questions')
        min_amount_questions= form.cleaned_data.get('min_amount_questions')
        
        filters = {}
        if username:
            try:
                user = User.objects.get(username=username)
                filters['user_id'] = user.id
            except User.DoesNotExist:
                favorite_quizzes = QivipQuiz.objects.none()
                filter_my_quizzes = QivipQuiz.objects.none()
                filter_all_quizzes=QivipQuiz.objects.none()

        if search:
            filters['name__icontains'] = search
        if  min_amount_questions:
            filters['max_amount_questions__gte'] =  min_amount_questions
        if max_amount_questions:
            filters['max_amount_questions__lte'] = max_amount_questions

        try:
           filter_all_quizzes = filter_all_quizzes.filter(**filters)
        except:
            filter_all_quizzes=QivipQuiz.objects.none()
        try:
           filter_my_quizzes = filter_my_quizzes.filter(**filters)
        except:
            filter_my_quizzes=QivipQuiz.objects.none()

        try:
            favorite_quizzes = favorite_quizzes.filter(**filters)
        except:
            favorite_quizzes=QivipQuiz.objects.none()

        

        # Pagination for my quizzes
        my_quizzes_paginator = Paginator(filter_my_quizzes.order_by('-creation_date'), 8)  # 8 quizzes per page
        try:
            my_quizzes = my_quizzes_paginator.page(request.GET.get('my_page', 1))
        except:
            my_quizzes = my_quizzes_paginator.page(1)

        # Pagination for all quizzes
        all_quizzes_paginator = Paginator(filter_all_quizzes.order_by('-creation_date'), 8)  # 8 quizzes per page
        try:
            all_quizzes = all_quizzes_paginator.page(request.GET.get('all_page', 1))
        except:
            all_quizzes = all_quizzes_paginator.page(1)

  

        try:
            favorite_quizzes = favorite_quizzes.filter(
            favorites__user=request.user,  # Filtere nach dem User
            favorites__favorite=True  # Filtere nach favorisierten Quizzes
            ).order_by('-favorites__favorite_date')
        except:
            pass


        # Pagination for favorite_quizzes
        favorite_quizzes_paginator = Paginator(favorite_quizzes, 8)  # 9 quizzes per page
        try:
           favorite_quizzes = favorite_quizzes_paginator.page(request.GET.get('favorite_page', 1))
        except:
            favorite_quizzes = favorite_quizzes_paginator.page(1)

        context = {
            'show_search': True,
            'favorite_quiz_ids': favorite_quiz_ids,
            'favorite_quizzes':favorite_quizzes,
            'my_quizzes': my_quizzes,
            'all_quizzes': all_quizzes,
            'form': form,
        }

        return render(request, 'library/overview_quiz.html', context)
      """

@login_required
def favorite_quiz(request, pk):
    quiz= get_object_or_404(QivipQuiz, pk=pk)
    favorite = QivipQuizFavorite.objects.filter(user=request.user, quiz=quiz).first()
    
    if favorite:
        favorite.favorite=not favorite.favorite
        
        


        if favorite.favorite==True:
            favorite.favorite_date = timezone.now()        
            favorite.save()
        else:
            favorite.favorite_date = None
            favorite.delete()
            statement="Das Quiz '"+ favorite.quiz.name+ "' wurde erfolgreich von den Favoriten entfernt!"
            messages.error(request, statement)
    
        
    else:
       favorite=QivipQuizFavorite.objects.create(user=request.user, quiz=quiz, favorite=True, favorite_date=timezone.now())
       statement="Das Quiz '"+ favorite.quiz.name+ "' wurde erfolgreich zu den Favoriten hinzugefügt!"
       messages.success(request,statement )

    return redirect(request.META.get('HTTP_REFERER', 'library:overview_quiz'))
    
    
# Neues Quiz erstellen
@login_required
def new_quiz(request):

        
    if request.method == 'POST':


        form = QuizForm(request.POST, request.FILES)
        
 

        if form.is_valid():
            quiz = form.save(commit=False)
            status = form.cleaned_data.get('status')
    
            if status == 'öffentlich' and not quiz.published_at:
                quiz.published_at = timezone.now()

            try:
                quiz_image=request.FILES['quiz_image']

                imagequiz=QuizImage.objects.create(image=quiz_image)
                quiz.image=imagequiz

            except:
                pass

            
            quiz.user_id = request.user


            #quiz.creator = request.user
            quiz.save()
            #form.save_m2m()  # Speichert die Many-to-Many Beziehungen (Tags)
            return redirect('library:detail_quiz', pk=quiz.pk)
            
    else:
        form = QuizForm()
    return render(request, 'library/form.html', {'form': form})

# Quiz bearbeiten
@login_required
def edit_quiz(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk, user_id=request.user)
    if request.method == 'POST':
        form = QuizForm(request.POST, instance=quiz, files=request.FILES)
        


        if form.is_valid():



            if 'reset_image' in request.POST:
                quiz.image = None

            try:
                quiz_image=request.FILES['quiz_image']
                imagequiz=QuizImage.objects.create(image=quiz_image)
                quiz.image=imagequiz


            except:
                pass

            quiz = form.save(commit=False)
    
            # Beispiel: Status aus dem Formular holen
            status = form.cleaned_data.get('status')
            if status == 'öffentlich' and not quiz.published_at:
                quiz.published_at = timezone.now()
            
            form.save()
            for img in QuizImage.objects.all():
                try:
                    img.delete()
                    img.image.delete(save=False)
                except:
                    pass
            return redirect('library:detail_quiz', pk=pk)
            #return modified(request, pk)
            
    else:
        form = QuizForm(instance=quiz)
    return render(request, 'library/form.html', {'form': form})
    
# Quiz löschen
@login_required
def delete_quiz(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk, user_id=request.user)
    if request.method == 'POST':
        quiz.delete()
        for img in QuizImage.objects.all():
            try:
                img.delete()
                img.image.delete(save=False)
            except:
                pass
        for img in QuestionImage.objects.all():
            try:
                img.delete()
                img.image.delete(save=False)
            except:
                pass

        return redirect('library:overview_quiz')
    return render(request, 'library/delete_confirmation.html', {'object': quiz})

# Quiz anzeigen
def detail_quiz(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk)
    show_answers = request.GET.get('show_answers', 'false').lower() == 'true'
    questions = QivipQuestion.objects.filter(quiz_id=quiz)
    # Parse JSON data for each question
    for question in questions:
        if question.data:
            question.data = json.loads(question.data)

    context = {
        'quiz': quiz,
        'questions': questions,
        'detail':show_answers,
    }
    if quiz.status!="privat" or quiz.user_id==request.user:
        return render(request, 'library/detail_quiz.html', context)
    else:
        return redirect('library:overview_quiz')



@login_required
def copy_quiz(request, pk):
    original_quiz = get_object_or_404(QivipQuiz, pk=pk)

    
    
    # Quiz kopieren (ohne ID, damit ein neues Objekt erstellt wird)
 
        # Quiz kopieren (ohne ID, damit ein neues Objekt erstellt wird)

    new_quiz = original_quiz     # Kopie erstellen (aber Achtung: Noch gleiche Referenz!)
    new_quiz.pk = None  # Setzt die ID auf None, damit Django es als neues Objekt erkennt
    new_quiz.uuid = uuid.uuid4()  # Neue UUID generieren
    new_quiz.user_id = request.user  # Neuer Besitzer ist der aktuelle User
    new_quiz.name += " - Kopie"
    new_quiz.base_quiz_id = pk
    new_quiz.rating_count = 0
    new_quiz.average_rating = 3.0
    if original_quiz.status=="öffentlich":
        new_quiz.published_at = timezone.now()
    else:
        new_quiz.published_at = None

    new_quiz.save()  # Speichern als neues Objekt 
   # Optional: Beschreibung anpassen
    # Alle zugehörigen Fragen kopieren
    questions = QivipQuestion.objects.filter(quiz_id=pk)
    for question in questions:
        question.uuid = uuid.uuid4()
        question.pk = None  # Setze pk auf None, damit es als neues Objekt gespeichert wird
        question.quiz_id = original_quiz  # Verknüpfe mit dem neuen Quiz
        question.data = question.data  # `data`-Feld wird explizit übernommen # Verknüpfe mit dem neuen Quiz

        question.save()
    
    messages.success(request, "Quiz wurde erfolgreich kopiert!")
    return redirect('library:detail_quiz', pk=new_quiz.pk)


# Übersicht aller Fragen
@login_required
def question_list(request):
    questions = QivipQuestion.objects.filter(quiz_id__user_id=request.user)
    
    # Parse JSON data for each question
    for question in questions:
        if question.data:
            question.data = json.loads(question.data)
    
    return render(request, 'library/question_list.html', {'questions': questions})

# Neue Frage erstellen
@login_required 
def new_question(request):
    question_type = request.GET.get('type')
    quiz_id = request.GET.get('quiz_id')
    
    if not quiz_id:
        messages.error(request, 'Quiz ID muss angegeben werden.')
        return redirect('library:overview_quiz')
        
    try:
        quiz = QivipQuiz.objects.get(pk=quiz_id, user_id=request.user)
    except QivipQuiz.DoesNotExist:
        messages.error(request, 'Quiz nicht gefunden oder keine Berechtigung.')
        return redirect('library:overview_quiz')
    
    if question_type not in ['multiple_choice', 'true_false','input']:
        base_url = reverse('library:new_question')
        return redirect(f'{base_url}?type=multiple_choice&quiz_id={quiz_id}')
       
    if request.method == 'POST':
        question_text = request.POST.get('question', '')
        
        # Handle different question types
        if question_type == 'true_false':
            correct_answer = request.POST.get('correct_answer') == 'true'
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': [
                    {'value': 'Wahr', 'is_correct': correct_answer},
                    {'value': 'Falsch', 'is_correct': not correct_answer}
                ]
            }

        elif question_type == 'input':
            correct_answer = request.POST.get('correct_answer')
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': [
                    {'value': correct_answer, 'is_correct': True}
                    
                ]
            } 
        elif question_type == 'multiple_choice':
            options = []
            i = 1
            # Limit to maximum 6 options
            while request.POST.get(f'option_{i}') and i <= 6:
                is_correct = request.POST.get(f'correct_{i}') == '1'
                options.append({
                    'order': i,
                    'value': request.POST.get(f'option_{i}'),
                    'is_correct': is_correct
                })
                i += 1
                
            # Validate minimum 2 options
            if len(options) < 2:
                messages.error(request, 'Mindestens zwei Optionen müssen angegeben werden.')
                return redirect(request.get_full_path())
                
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': options
            }
        
        question = QivipQuestion()
        question.data = json.dumps(json_data)
        question.quiz_id = quiz
        try:
            question_image=request.FILES['question_image']
            imagequestion=QuestionImage.objects.create(image=question_image)
            question.image=imagequestion
        except:
            pass


        question.time_per_question = request.POST.get('time_per_question', '30')
        try:
            question.credits=request.POST.get('credits',"")
        except:
            question.credits=""
        question.save()
        #return modified(request, pk=quiz.pk)
        return redirect('library:detail_quiz', pk=quiz.pk)
    else:
        # Initialize empty question data for new questions
        if question_type == 'true_false':
            question_data = {
                'type': question_type,
                'question': '',
                'options': [
                    {'value': 'Wahr', 'is_correct': True},
                    {'value': 'Falsch', 'is_correct': False}
                ]
            }
            standard_time_per_question = 30

        elif question_type == 'input':
            question_data = {
                'type': question_type,
                'question': '',
                'options': [
                    
                    
                ]
            } 
            standard_time_per_question = 30

        elif question_type == 'multiple_choice':
            question_data = {
                'type': question_type,
                'question': '',
                'options': [
                    {'value': '', 'is_correct': False},
                    {'value': '', 'is_correct': False}
                ]
            }
            standard_time_per_question = 30
            
    template_name = f'library/question/question_{question_type}.html'
    context = {
        'question': question_data,
        'quiz_id': quiz_id,
        'quiz': quiz,
        'standard_time_per_question': standard_time_per_question,
    }
    
    return render(request, template_name, context)

# Frage bearbeiten
@login_required
def edit_question(request, pk):
    question = get_object_or_404(QivipQuestion, pk=pk, quiz_id__user_id=request.user)
    if 'reset_ques_image' in request.POST:
                question.image = None
    if question.quiz_id.user_id != request.user:
        return redirect('library:question_list')
    
    # Parse the existing JSON data
    try:
        question_data = json.loads(question.data) if question.data else {}
        question_type = question_data.get('type', 'multiple_choice')
        question_image = question.image
        
        # For true/false questions, get the correct answer from the options
        if question_type == 'true_false':
            # Default to true if no options exist
            correct_answer = True
            if question_data.get('options'):
                correct_answer = question_data['options'][0].get('is_correct', True)
            question_data = {
                'type': question_type,
                'question': question_data.get('question', ''),
                'correct_answer': correct_answer,  # Add this for template compatibility
                'options': [
                    {'value': 'Wahr', 'is_correct': correct_answer},
                    {'value': 'Falsch', 'is_correct': not correct_answer}
                ]
            }
        else:
            # For multiple choice questions
            question_data.setdefault('type', question_type)
            question_data.setdefault('question', '')
            question_data.setdefault('options', [])
            
    except (json.JSONDecodeError, AttributeError):
        # Handle invalid JSON or None data
        question_type = question_data.get('type', 'multiple_choice')
        if question_type == 'true_false':
            question_data = {
                'type': question_type,
                'question': '',
                'correct_answer': True,  # Default to true for new questions
                'options': [
                    {'value': 'Wahr', 'is_correct': True},
                    {'value': 'Falsch', 'is_correct': False}
                ]
            }
        else:
            question_data = {
                'type': question_type,
                'question': '',
                'options': []
            }
        
    if request.method == 'POST':
        question_text = request.POST.get('question', '')
        try:
            question_image=request.FILES['question_image']
            imagequestion=QuestionImage.objects.create(image=question_image)
            question.image=imagequestion
        except Exception:
            pass

        # Handle different question types
        if question_type == 'true_false':
            correct_answer = request.POST.get('correct_answer') == 'true'
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': [
                    {'value': 'Wahr', 'is_correct': correct_answer},
                    {'value': 'Falsch', 'is_correct': not correct_answer}
                ]
            }
        elif question_type == 'input':
            correct_answer = request.POST.get('correct_answer')
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': [
                    {'value': correct_answer,'is_correct':True}
                    
                ]
            } 

        elif question_type == 'multiple_choice':
            options = []
            i = 1
            # Limit to maximum 6 options
            while request.POST.get(f'option_{i}') and i <= 6:
                options.append({
                    'order': i,
                    'value': request.POST.get(f'option_{i}'),
                    'is_correct': request.POST.get(f'correct_{i}') == '1'
                })
                i += 1
                
            # Validate minimum 2 options
            if len(options) < 2:
                messages.error(request, 'Mindestens zwei Optionen müssen angegeben werden.')
                return redirect(request.get_full_path())

            # Validate maximum 6 options
            if len(options) > 6:
                messages.error(request, 'Maximal 6 Optionen sind erlaubt.')
                return redirect(request.get_full_path())
                
            json_data = {
                'type': question_type,
                'question': question_text,
                'options': options
            }
            
        question.data = json.dumps(json_data)
        question.time_per_question = request.POST.get('time_per_question', '30')
        try:
            question.credits=request.POST.get('credits',"")
        except:
            question.credits=""
 
        question.save()
        for img in QuestionImage.objects.all():
            try:
                img.delete()
                img.image.delete(save=False)
            except:
                pass
        #return modified(request, question.quiz_id.pk)
        return redirect('library:detail_quiz', pk=question.quiz_id.pk)
        
    else:
        template_name = f'library/question/question_{question_type}.html'
        context = {
            'credits':question.credits,
            'question': {'data': question_data},  # Wrap in data structure expected by template
            'quiz_id': question.quiz_id.pk,
            'quiz': question.quiz_id,
            'time_per_question': question.time_per_question,
            'image': question_image,
        }
        
        return render(request, template_name, context)


# Frage löschen
@login_required
def delete_question(request, pk):
    question = get_object_or_404(QivipQuestion, pk=pk, quiz_id__user_id=request.user)
    
    # Parse JSON data for question
    if question.data:
        question.data = json.loads(question.data)
    
    if request.method == 'POST':
        question.delete()
        for img in QuestionImage.objects.all():
            try:
                img.delete()
                img.image.delete(save=False)
            except:
                pass
        return redirect('library:detail_quiz', pk=question.quiz_id.pk)
    return render(request, 'library/delete_confirmation.html', {'object': question})