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
from .forms import QuizForm, QuestionForm
import json

# Übersicht aller Quizze
@login_required
def overview_quiz(request):
    quizzes = QivipQuiz.objects.filter(user_id=request.user)
    return render(request, 'library/overview_quiz.html', {'quizzes': quizzes})

# Neues Quiz erstellen
@login_required
def new_quiz(request):
    if request.method == 'POST':
        form = QuizForm(request.POST)
        if form.is_valid():
            quiz = form.save(commit=False)
            quiz.user_id = request.user
            quiz.save()
            form.save_m2m()  # Speichert die Many-to-Many Beziehungen (Tags)
            return redirect('library:edit_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)
        if form.is_valid():
            form.save()
            return redirect('library:overview_quiz')
    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()
        return redirect('library:overview_quiz')
    return render(request, 'library/delete_confirmation.html', {'object': quiz})

# Quiz anzeigen
@login_required
def detail_quiz(request, pk):
    quiz = get_object_or_404(QivipQuiz, pk=pk, user_id=request.user)
    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
    }
    return render(request, 'library/detail_quiz.html', context)

# 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']:
        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 == '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
        question.save()
        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}
                ]
            }
        elif question_type == 'multiple_choice':
            question_data = {
                'type': question_type,
                'question': '',
                'options': [
                    {'value': '', 'is_correct': False},
                    {'value': '', 'is_correct': False}
                ]
            }
    
    template_name = f'library/question/question_{question_type}.html'
    context = {
        'question': question_data,
        'quiz_id': quiz_id,
        'quiz': quiz
    }
    
    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 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')
        
        # 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', '')
        
        # 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 == '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.save()
        return redirect('library:detail_quiz', pk=question.quiz_id.pk)
    else:
        template_name = f'library/question/question_{question_type}.html'
        context = {
            'question': {'data': question_data},  # Wrap in data structure expected by template
            'quiz_id': question.quiz_id.pk,
            'quiz': question.quiz_id
        }
        
        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()
        return redirect('library:detail_quiz', pk=question.quiz_id.pk)
    return render(request, 'library/delete_confirmation.html', {'object': question})