app.py

import gradio as gr
from groq import Groq
import os
from PIL import Image, ImageDraw, ImageFont
from datetime import datetime
import json
import tempfile
from typing import List, Dict, Tuple, Optional
from dataclasses import dataclass
import subprocess

@dataclass
class Question:
    question: str
    options: List[str]
    correct_answer: int

@dataclass
class QuizFeedback:
    is_correct: bool
    selected: Optional[str]
    correct_answer: str

class QuizGenerator:
    def __init__(self, api_key: str):
        self.client = Groq(api_key=api_key)
        
    def generate_questions(self, text: str, num_questions: int) -> List[Question]:
        """Generate quiz questions from input text"""
        prompt = self._create_prompt(text, num_questions)
        
        try:
            # Make API request with improved error handling
            response = self.client.chat.completions.create(
                messages=[
                    {
                        "role": "system",
                        "content": """You are a quiz generator. Generate multiple choice questions based on the given text.
                        Each question must have exactly 4 options and one correct answer.
                        Return ONLY a valid JSON array of questions in the specified format.
                        Make questions clear, focused and directly related to the input text.
                        Avoid subjective or ambiguous questions."""
                    },
                    {
                        "role": "user",
                        "content": prompt
                    }
                ],
                model="llama2-70b-4096",  # Using a more capable model
                temperature=0.2,  # Lower temperature for more consistent output
                max_tokens=2048,
                stop=None  # Let the model complete its output
            )
            
            if not response or not response.choices or not response.choices[0].message.content:
                raise ValueError("Empty response from API")
                
            # Parse and validate response
            questions = self._parse_response(response.choices[0].message.content)
            validated = self._validate_questions(questions, num_questions)
            
            if not validated:
                raise ValueError("No valid questions generated")
                
            return validated
            
        except Exception as e:
            print(f"Error in generate_questions: {str(e)}")
            print(f"Full error details: ", {
                "error": str(e),
                "response": getattr(response, 'choices', [{}])[0].get('message', {}).get('content', 'No content')
                if 'response' in locals() else 'No response'
            })
            raise QuizGenerationError(f"Failed to generate questions: {str(e)}")
    
    def _create_prompt(self, text: str, num_questions: int) -> str:
        """Create a clear, structured prompt for question generation"""
        return f"""Generate exactly {num_questions} multiple choice questions based on this text. For each question:

1. Create a clear, specific question focusing on key information
2. Provide exactly 4 answer options
3. Ensure one and only one option is correct
4. Keep options concise (under 10 words each)
5. Avoid subjective or ambiguous questions
6. Make all options plausible but only one correct

Return ONLY a JSON array in this exact format:
[
    {{
        "question": "Question text here?",
        "options": [
            "Option 1",
            "Option 2",
            "Option 3",
            "Option 4"
        ],
        "correct_answer": 0
    }}
]

The correct_answer should be the index (0-3) of the correct option.
Return only the JSON array, no other text.

Text to generate questions from:
{text.strip()}"""

    def _parse_response(self, response_text: str) -> List[Dict]:
        """Parse API response with robust error handling"""
        try:
            # Clean up the response text
            cleaned = response_text.strip()
            # Remove any markdown code block markers
            cleaned = cleaned.replace('```json', '').replace('```', '').strip()
            
            # Find the JSON array
            start = cleaned.find('[')
            end = cleaned.rfind(']') + 1
            
            if start == -1 or end == 0:
                raise ValueError("No JSON array found in response")
                
            json_str = cleaned[start:end]
            
            # Parse JSON
            try:
                questions = json.loads(json_str)
            except json.JSONDecodeError as e:
                print(f"JSON Parse Error: {str(e)}")
                print(f"Attempted to parse: {json_str}")
                raise
                
            if not isinstance(questions, list):
                raise ValueError("Response is not a list of questions")
                
            return questions
            
        except Exception as e:
            print(f"Error parsing response: {str(e)}")
            print(f"Original response: {response_text}")
            raise ValueError(f"Failed to parse questions: {str(e)}")
    
    def _validate_questions(self, questions: List[Dict], num_questions: int) -> List[Question]:
        """Validate and convert questions to Question objects"""
        validated = []
        
        for q in questions[:num_questions]:
            try:
                # Validate question structure
                if not isinstance(q, dict):
                    continue
                    
                required_keys = {"question", "options", "correct_answer"}
                if not all(key in q for key in required_keys):
                    continue
                    
                if not isinstance(q["options"], list) or len(q["options"]) != 4:
                    continue
                    
                # Convert correct_answer to int and validate
                try:
                    correct_idx = int(q["correct_answer"])
                    if not 0 <= correct_idx < 4:
                        continue
                except (ValueError, TypeError):
                    continue
                
                # Create Question object
                validated.append(Question(
                    question=str(q["question"]).strip(),
                    options=[str(opt).strip() for opt in q["options"]],
                    correct_answer=correct_idx
                ))
                
            except Exception as e:
                print(f"Error validating question: {str(e)}")
                continue
        
        return validated

class FontManager:
    """Manages font installation and loading for the certificate generator"""
    
    @staticmethod
    def install_fonts():
        """Install required fonts if they're not already present"""
        try:
            # Install fonts package
            subprocess.run([
                "apt-get", "update", "-y"
            ], check=True)
            subprocess.run([
                "apt-get", "install", "-y",
                "fonts-liberation",    # Liberation Sans fonts
                "fontconfig",          # Font configuration
                "fonts-dejavu-core"    # DejaVu fonts as fallback
            ], check=True)
            
            # Clear font cache
            subprocess.run(["fc-cache", "-f"], check=True)
            print("Fonts installed successfully")
        except subprocess.CalledProcessError as e:
            print(f"Warning: Could not install fonts: {e}")
        except Exception as e:
            print(f"Warning: Unexpected error installing fonts: {e}")
    
    @staticmethod
    def get_font_paths() -> Dict[str, str]:
        """Get the paths to the required fonts with multiple fallbacks"""
        standard_paths = [
            "/usr/share/fonts",
            "/usr/local/share/fonts",
            "/usr/share/fonts/truetype",
            "~/.fonts"
        ]
        
        font_paths = {
            'regular': None,
            'bold': None
        }
        
        # Common font filenames to try
        fonts_to_try = {
            'regular': [
                'LiberationSans-Regular.ttf',
                'DejaVuSans.ttf',
                'FreeSans.ttf'
            ],
            'bold': [
                'LiberationSans-Bold.ttf',
                'DejaVuSans-Bold.ttf',
                'FreeSans-Bold.ttf'
            ]
        }
        
        def find_font(font_name: str) -> Optional[str]:
            """Search for a font file in standard locations"""
            for base_path in standard_paths:
                for root, _, files in os.walk(os.path.expanduser(base_path)):
                    if font_name in files:
                        return os.path.join(root, font_name)
            return None
        
        # Try to find each font
        for style in ['regular', 'bold']:
            for font_name in fonts_to_try[style]:
                font_path = find_font(font_name)
                if font_path:
                    font_paths[style] = font_path
                    break
        
        # If no fonts found, try using fc-match as fallback
        if not all(font_paths.values()):
            try:
                for style in ['regular', 'bold']:
                    if not font_paths[style]:
                        result = subprocess.run(
                            ['fc-match', '-f', '%{file}', 'sans-serif:style=' + style],
                            capture_output=True,
                            text=True
                        )
                        if result.returncode == 0 and result.stdout.strip():
                            font_paths[style] = result.stdout.strip()
            except Exception as e:
                print(f"Warning: Could not use fc-match to find fonts: {e}")
        
        return font_paths

class QuizGenerationError(Exception):
    """Exception raised for errors in quiz generation"""
    pass

class CertificateGenerator:
    def __init__(self):
        self.certificate_size = (1200, 800)
        self.background_color = '#FFFFFF'
        self.border_color = '#1C1D1F'
        
        # Install fonts if needed
        FontManager.install_fonts()
        self.font_paths = FontManager.get_font_paths()
    
    def _load_fonts(self) -> Dict[str, ImageFont.FreeTypeFont]:
        """Load fonts with fallbacks"""
        fonts = {}
        try:
            if self.font_paths['regular'] and self.font_paths['bold']:
                fonts['title'] = ImageFont.truetype(self.font_paths['bold'], 36)
                fonts['subtitle'] = ImageFont.truetype(self.font_paths['regular'], 14)
                fonts['text'] = ImageFont.truetype(self.font_paths['regular'], 20)
                fonts['name'] = ImageFont.truetype(self.font_paths['bold'], 32)
            else:
                raise ValueError("No suitable fonts found")
        except Exception as e:
            print(f"Font loading error: {e}. Using default font.")
            default = ImageFont.load_default()
            fonts = {
                'title': default,
                'subtitle': default,
                'text': default,
                'name': default
            }
        return fonts
    
    def _add_professional_border(self, draw: ImageDraw.Draw):
        # Single elegant inner border with padding
        padding = 40
        draw.rectangle(
            [(padding, padding), 
             (self.certificate_size[0] - padding, self.certificate_size[1] - padding)],
            outline='#1C1D1F',
            width=2
        )
    
    def _add_content(
        self,
        draw: ImageDraw.Draw,
        fonts: Dict[str, ImageFont.FreeTypeFont],
        name: str,
        course_name: str,
        score: float
    ):
        # Add "CERTIFICATE OF COMPLETION" text
        draw.text((60, 140), "CERTIFICATE OF COMPLETION", font=fonts['subtitle'], fill='#666666')
        
        # Add course name (large and bold)
        course_name = course_name.strip() or "Assessment"
        text_width = draw.textlength(course_name, fonts['title'])
        max_width = self.certificate_size[0] - 120  # Leave margins
        if text_width > max_width:
            words = course_name.split()
            lines = []
            current_line = []
            current_width = 0
            for word in words:
                word_width = draw.textlength(word + " ", fonts['title'])
                if current_width + word_width <= max_width:
                    current_line.append(word)
                    current_width += word_width
                else:
                    lines.append(" ".join(current_line))
                    current_line = [word]
                    current_width = word_width
            if current_line:
                lines.append(" ".join(current_line))
            course_name = "\n".join(lines)
        
        draw.multiline_text((60, 200), course_name, font=fonts['title'], fill='#1C1D1F', spacing=10)
        
        # Add instructor info
        draw.text((60, 300), "Instructor", font=fonts['subtitle'], fill='#666666')
        draw.text((60, 330), "CertifyMe AI", font=fonts['text'], fill='#1C1D1F')
        
        # Add participant name (large)
        name = name.strip() or "Participant"
        draw.text((60, 420), name, font=fonts['name'], fill='#1C1D1F')
        
        # Add date and score info with spacing
        date_str = datetime.now().strftime("%b. %d, %Y")
        
        # Date section
        draw.text((60, 500), "Date", font=fonts['subtitle'], fill='#666666')
        draw.text((60, 530), date_str, font=fonts['text'], fill='#1C1D1F')
        
        # Score section
        draw.text((300, 500), "Score", font=fonts['subtitle'], fill='#666666')
        draw.text((300, 530), f"{float(score):.1f}%", font=fonts['text'], fill='#1C1D1F')

        # Footer section with certificate number and reference
        certificate_id = f"Certificate no: {datetime.now().strftime('%Y%m%d')}-{abs(hash(name)) % 10000:04d}"
        ref_number = f"Reference Number: {abs(hash(name + date_str)) % 10000:04d}"
        
        # Draw footer text aligned to left and right
        draw.text((60, 720), certificate_id, font=fonts['subtitle'], fill='#666666')
        draw.text((1140, 720), ref_number, font=fonts['subtitle'], fill='#666666', anchor="ra")
    
    def _add_logo(self, certificate: Image.Image, logo_path: str):
        try:
            logo = Image.open(logo_path)
            # Resize logo to appropriate size
            logo.thumbnail((150, 80))
            # Position in top-left corner with padding
            certificate.paste(logo, (60, 50), mask=logo if 'A' in logo.getbands() else None)
        except Exception as e:
            print(f"Error adding logo: {e}")
    
    def _add_photo(self, certificate: Image.Image, photo_path: str):
        try:
            photo = Image.open(photo_path)
            # Create circular mask
            size = (100, 100)
            mask = Image.new('L', size, 0)
            draw = ImageDraw.Draw(mask)
            draw.ellipse((0, 0, size[0], size[1]), fill=255)
            
            # Resize photo maintaining aspect ratio
            photo.thumbnail(size)
            
            # Create a circular photo
            output = Image.new('RGBA', size, (0, 0, 0, 0))
            output.paste(photo, (0, 0))
            output.putalpha(mask)
            
            # Position in top-right corner with padding
            certificate.paste(output, (1000, 50), mask=output)
        except Exception as e:
            print(f"Error adding photo: {e}")
    
    def generate(
        self,
        score: float,
        name: str,
        course_name: str,
        company_logo: Optional[str] = None,
        participant_photo: Optional[str] = None
    ) -> str:
        try:
            certificate = self._create_base_certificate()
            draw = ImageDraw.Draw(certificate)
            
            # Add professional border
            self._add_professional_border(draw)
            
            fonts = self._load_fonts()
            self._add_content(draw, fonts, str(name), str(course_name), float(score))
            
            if company_logo:
                self._add_logo(certificate, company_logo)
            
            if participant_photo:
                self._add_photo(certificate, participant_photo)
            
            return self._save_certificate(certificate)
        except Exception as e:
            print(f"Error generating certificate: {e}")
            return None
    
    def _create_base_certificate(self) -> Image.Image:
        return Image.new('RGB', self.certificate_size, self.background_color)
    
    def _save_certificate(self, certificate: Image.Image) -> str:
        temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.png')
        certificate.save(temp_file.name, 'PNG', quality=95)
        return temp_file.name

    
class QuizApp:
    def __init__(self, api_key: str):
        self.quiz_generator = QuizGenerator(api_key)
        self.certificate_generator = CertificateGenerator()
        self.current_questions: List[Question] = []

    def generate_questions(self, text: str, num_questions: int) -> Tuple[bool, List[Question]]:
        """
        Generate quiz questions using the QuizGenerator
        Returns (success, questions) tuple
        """
        try:
            questions = self.quiz_generator.generate_questions(text, num_questions)
            self.current_questions = questions
            return True, questions
        except Exception as e:
            print(f"Error generating questions: {e}")
            return False, []
    
    def calculate_score(self, answers: List[Optional[str]]) -> Tuple[float, bool, List[QuizFeedback]]:
        """
        Calculate the quiz score and generate feedback
        Returns (score, passed, feedback) tuple
        """
        if not answers or not self.current_questions:
            return 0, False, []
        
        feedback = []
        correct = 0
        
        for question, answer in zip(self.current_questions, answers):
            if answer is None:
                feedback.append(QuizFeedback(False, None, question.options[question.correct_answer]))
                continue
                
            try:
                selected_index = question.options.index(answer)
                is_correct = selected_index == question.correct_answer
                if is_correct:
                    correct += 1
                feedback.append(QuizFeedback(
                    is_correct,
                    answer,
                    question.options[question.correct_answer]
                ))
            except ValueError:
                feedback.append(QuizFeedback(False, answer, question.options[question.correct_answer]))
        
        score = (correct / len(self.current_questions)) * 100
        return score, score >= 80, feedback
    
    def update_questions(self, text: str, num_questions: int) -> Tuple[gr.update, gr.update, List[gr.update], List[Question], gr.update]:
        """
        Event handler for generating new questions
        """
        if not text.strip():
            return (
                gr.update(value=""),
                gr.update(value="⚠️ Please enter some text content to generate questions."),
                *[gr.update(visible=False, choices=[]) for _ in range(5)],
                [],
                gr.update(selected=1)
            )
        
        success, questions = self.generate_questions(text, num_questions)
        
        if not success or not questions:
            return (
                gr.update(value=""),
                gr.update(value="❌ Failed to generate questions. Please try again."),
                *[gr.update(visible=False, choices=[]) for _ in range(5)],
                [],
                gr.update(selected=1)
            )
        
        # Create question display
        questions_html = "# 📝 Assessment Questions\n\n"
        questions_html += "> Please select one answer for each question.\n\n"
        
        # Update radio buttons
        updates = []
        for i, q in enumerate(questions):
            questions_html += f"### Question {i+1}\n{q.question}\n\n"
            updates.append(gr.update(
                visible=True,
                choices=q.options,
                value=None,
                label=f"Select your answer:"
            ))
        
        # Hide unused radio buttons
        for i in range(len(questions), 5):
            updates.append(gr.update(visible=False, choices=[]))
        
        return (
            gr.update(value=questions_html),
            gr.update(value=""),
            *updates,
            questions,
            gr.update(selected=1)
        )
    
    def submit_quiz(self, q1: Optional[str], q2: Optional[str], q3: Optional[str], 
                   q4: Optional[str], q5: Optional[str], questions: List[Question]
    ) -> Tuple[gr.update, List[gr.update], float, str, gr.update]:
        """
        Event handler for quiz submission
        """
        answers = [q1, q2, q3, q4, q5][:len(questions)]
        
        if not all(a is not None for a in answers):
            return (
                gr.update(value="⚠️ Please answer all questions before submitting."),
                *[gr.update() for _ in range(5)],
                0,
                "",
                gr.update(selected=1)
            )
        
        score, passed, feedback = self.calculate_score(answers)
        
        # Create feedback HTML
        feedback_html = "# Assessment Results\n\n"
        for i, (q, f) in enumerate(zip(self.current_questions, feedback)):
            color = "green" if f.is_correct else "red"
            symbol = "✅" if f.is_correct else "❌"
            feedback_html += f"""
            ### Question {i+1}
            {q.question}
            
            <div style="color: {color}; padding: 10px; margin: 5px 0; border-left: 3px solid {color};">
                {symbol} Your answer: {f.selected}
                {'' if f.is_correct else f'<br>Correct answer: {f.correct_answer}'}
            </div>
            """
        
        # Add result message
        if passed:
            feedback_html += self._create_success_message(score)
            result_msg = f"🎉 Congratulations! You passed with {score:.1f}%"
        else:
            feedback_html += self._create_failure_message(score)
            result_msg = f"Score: {score:.1f}%. You need 80% to pass."
        
        return (
            gr.update(value=feedback_html),
            *[gr.update(visible=False) for _ in range(5)],
            score,
            result_msg,
            gr.update(selected=2)
        )
    
    def _create_success_message(self, score: float) -> str:
        return f"""
        <div style="background-color: #e6ffe6; padding: 20px; margin-top: 20px; border-radius: 10px;">
            <h3 style="color: #008000;">🎉 Congratulations!</h3>
            <p>You passed the assessment with a score of {score:.1f}%</p>
            <p>Your certificate has been generated.</p>
        </div>
        """
    
    def _create_failure_message(self, score: float) -> str:
        return f"""
        <div style="background-color: #ffe6e6; padding: 20px; margin-top: 20px; border-radius: 10px;">
            <h3 style="color: #cc0000;">Please Try Again</h3>
            <p>Your score: {score:.1f}%</p>
            <p>You need 80% or higher to pass and receive a certificate.</p>
        </div>
        """

def create_quiz_interface():
    if not os.getenv("GROQ_API_KEY"):
        raise EnvironmentError("Please set your GROQ_API_KEY environment variable")
        
    quiz_app = QuizApp(os.getenv("GROQ_API_KEY"))
    
    with gr.Blocks(title="CertifyMe AI", theme=gr.themes.Soft()) as demo:
        # State management
        current_questions = gr.State([])
        current_question_idx = gr.State(0)
        answer_state = gr.State([None] * 5)
        
        # Header
        gr.Markdown("""
        # 🎓 CertifyMe AI
        ### Transform Your Knowledge into Recognized Achievements
        """)
        
        with gr.Tabs() as tabs:
            # Profile Setup Tab
            with gr.Tab(id=1, label="📋 Step 1: Profile Setup"):
                with gr.Row():
                    name = gr.Textbox(label="Full Name", placeholder="Enter your full name")
                    email = gr.Textbox(label="Email", placeholder="Enter your email")
                
                text_input = gr.Textbox(
                    label="Learning Content",
                    placeholder="Enter the text content you want to be assessed on",
                    lines=10
                )
                
                num_questions = gr.Slider(
                    minimum=1,
                    maximum=20,
                    value=10,
                    step=1,
                    label="Number of Questions"
                )
                
                with gr.Row():
                    company_logo = gr.Image(label="Company Logo (Optional)", type="filepath")
                    participant_photo = gr.Image(label="Your Photo (Optional)", type="filepath")
                
                generate_btn = gr.Button("Generate Assessment", variant="primary", size="lg")
            
            # Assessment Tab
            with gr.Tab(id=2, label="📝 Step 2: Take Assessment"):
                with gr.Column() as main_container:
                    # Questions Section
                    with gr.Column(visible=True) as question_box:
                        question_display = gr.Markdown("")
                        current_options = gr.Radio(
                            choices=[],
                            label="Select your answer:",
                            visible=False
                        )
                        
                        with gr.Row():
                            prev_btn = gr.Button("← Previous", variant="secondary", size="sm")
                            question_counter = gr.Markdown("Question 1")
                            next_btn = gr.Button("Next →", variant="secondary", size="sm")
                        
                        gr.Markdown("---")  # Separator
                        
                        submit_btn = gr.Button(
                            "Submit Assessment",
                            variant="primary",
                            size="lg"
                        )

                    # Results Section in Assessment Tab
                    with gr.Column(visible=False) as results_group:
                        result_message = gr.Markdown(
                            label="Result",
                            show_label=True
                        )
                        feedback_box = gr.Markdown(
                            label="Detailed Feedback",
                            show_label=True
                        )
                        gr.Markdown("---")  # Separator
                        with gr.Row(equal_height=True):
                            reset_btn = gr.Button(
                                "Reset Quiz",
                                variant="secondary",
                                size="lg",
                                visible=False
                            )
                            view_cert_btn = gr.Button(
                                "View Certificate",
                                variant="primary",
                                size="lg",
                                visible=False
                            )                    

            # Certification Tab (Hidden by default)
            with gr.Tab(id=3, label="🎓 Step 3: Get Certified", visible=False) as cert_tab:
                score_display = gr.Number(label="Your Score", visible=False)
                course_name = gr.Textbox(
                    label="Certification Title",
                    value="Professional Assessment Certification",
                    interactive=False  # Make it non-editable
                )
                certificate_display = gr.Image(label="Your Certificate")

        # Update view_cert_btn click handler to show certification tab
        def show_certificate_tab():
            return [
                gr.update(visible=True),  # Make cert_tab visible
                gr.update(selected=3)     # Switch to cert_tab
            ]


        # Helper Functions
        def on_generate_questions(text, num_questions):
            if not text.strip():
                return [
                    "",
                    gr.update(visible=False),
                    gr.update(choices=[], visible=False),
                    "",
                    [],
                    0,
                    [None] * 5,
                    gr.update(selected=1),
                    gr.update(visible=False),
                    gr.update(visible=False)
                ]
            
            success, questions = quiz_app.generate_questions(text, num_questions)
            if not success or not questions:
                return [
                    "",
                    gr.update(visible=False),
                    gr.update(choices=[], visible=False),
                    "",
                    [],
                    0,
                    [None] * 5,
                    gr.update(selected=1),
                    gr.update(visible=False),
                    gr.update(visible=False)
                ]
            
            question = questions[0]
            question_md = f"""### Question 1
{question.question}"""
            
            return [
                question_md,
                gr.update(visible=True),
                gr.update(
                    choices=question.options,
                    value=None,
                    visible=True,
                    label="Select your answer:"
                ),
                f"Question 1 of {len(questions)}",
                questions,
                0,
                [None] * len(questions),
                gr.update(selected=2),
                gr.update(visible=False),
                gr.update(visible=False)
            ]

        def navigate(direction, current_idx, questions, answers, current_answer):
            if not questions:
                return [0, answers, "", gr.update(choices=[], visible=False), "", gr.update(visible=False)]
            
            new_answers = list(answers)
            if current_answer is not None and 0 <= current_idx < len(new_answers):
                new_answers[current_idx] = current_answer
            
            new_idx = max(0, min(len(questions) - 1, current_idx + direction))
            question = questions[new_idx]
            
            question_md = f"""### Question {new_idx + 1}
{question.question}"""
            
            return [
                new_idx,
                new_answers,
                question_md,
                gr.update(
                    choices=question.options,
                    value=new_answers[new_idx] if new_idx < len(new_answers) else None,
                    visible=True,
                    label="Select your answer:"
                ),
                f"Question {new_idx + 1} of {len(questions)}",
                gr.update(visible=True)
            ]

        def update_answer_state(answer, idx, current_answers):
            new_answers = list(current_answers)
            if 0 <= idx < len(new_answers):
                new_answers[idx] = answer
            return new_answers

        def reset_quiz(text, num_questions):
            """Handle quiz reset"""
            return on_generate_questions(text, num_questions)

        def view_certificate():
            """Navigate to certificate tab"""
            return gr.update(selected=3)

        def handle_prev(current_idx, questions, answers, current_answer):
                    return navigate(-1, current_idx, questions, answers, current_answer)
            
        def handle_next(current_idx, questions, answers, current_answer):
            return navigate(1, current_idx, questions, answers, current_answer)
        
        def on_submit(questions, answers, current_idx, current_answer):
            """Handle quiz submission with proper Markdown rendering and emojis"""
            final_answers = list(answers)
            if 0 <= current_idx < len(final_answers):
                final_answers[current_idx] = current_answer
            
            if not all(a is not None for a in final_answers[:len(questions)]):
                return [
                    "⚠️ Please answer all questions before submitting.",
                    gr.update(visible=True),
                    0,
                    "",
                    gr.update(visible=True),
                    gr.update(visible=True),
                    gr.update(visible=False),
                    gr.update(visible=False)
                ]
            
            score, passed, feedback = quiz_app.calculate_score(final_answers[:len(questions)])
            
            # Create feedback content using proper Markdown with emojis
            feedback_content = f"""# Assessment Results
        
        **Score: {score:.1f}%**
        
        """
            
            for i, (q, f) in enumerate(zip(questions, feedback)):
                icon = "✅" if f.is_correct else "❌"
                color = "green" if f.is_correct else "red"
                
                # Using markdown syntax with color formatting
                feedback_content += f"""### Question {i+1}
        {q.question}
        
        {icon} **Your answer:** {f.selected or 'No answer'}
        {'' if f.is_correct else f'**Correct answer:** {f.correct_answer}'}
        
        """
            
            # Add summary box
            if passed:
                feedback_content += f"""
        ---
        ## 🎉 Congratulations!
        You passed with a score of {score:.1f}%!
        """
            else:
                feedback_content += f"""
        ---
        ## Need Improvement
        You scored {score:.1f}%. You need 80% or higher to pass.
        Please try again.
        """
            
            return [
                feedback_content,                # feedback_box
                gr.update(visible=True),         # results_group
                score,                           # score_display
                f"Score: {score:.1f}%",         # result_message
                gr.update(visible=False),        # question_box
                gr.update(visible=not passed),   # reset_btn
                gr.update(visible=passed),       # view_cert_btn
                gr.update(selected=2)            # tabs
            ]
            
        # Event Handlers
        generate_btn.click(
            fn=on_generate_questions,
            inputs=[text_input, num_questions],
            outputs=[
                question_display,
                question_box,
                current_options,
                question_counter,
                current_questions,
                current_question_idx,
                answer_state,
                tabs,
                results_group,
                view_cert_btn
            ]
        )
        
        prev_btn.click(
            fn=handle_prev,
            inputs=[current_question_idx, current_questions, answer_state, current_options],
            outputs=[current_question_idx, answer_state, question_display, current_options, question_counter, question_box]
        )
        
        next_btn.click(
            fn=handle_next,
            inputs=[current_question_idx, current_questions, answer_state, current_options],
            outputs=[current_question_idx, answer_state, question_display, current_options, question_counter, question_box]
        )
        
        submit_btn.click(
            fn=on_submit,
            inputs=[current_questions, answer_state, current_question_idx, current_options],
            outputs=[
                feedback_box,
                results_group,
                score_display,
                result_message,  # Now properly defined
                question_box,
                reset_btn,
                view_cert_btn,
                tabs
            ]
        )
        
        reset_btn.click(
            fn=on_generate_questions,
            inputs=[text_input, num_questions],
            outputs=[
                question_display,
                question_box,
                current_options,
                question_counter,
                current_questions,
                current_question_idx,
                answer_state,
                tabs,
                results_group,
                view_cert_btn
            ]
        )
        
        view_cert_btn.click(
            fn=show_certificate_tab,
            outputs=[cert_tab, tabs]
        )
        
        current_options.change(
            fn=update_answer_state,
            inputs=[current_options, current_question_idx, answer_state],
            outputs=answer_state
        )
        
        score_display.change(
            fn=lambda s, n, c, l, p: quiz_app.certificate_generator.generate(s, n, c, l, p) or gr.update(value=None),
            inputs=[score_display, name, course_name, company_logo, participant_photo],
            outputs=certificate_display
        )
        
    return demo

if __name__ == "__main__":
    demo = create_quiz_interface()
    demo.launch()