app.py

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

@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 using llama-3.2-3b-preview model"""
        prompt = self._create_prompt(text, num_questions)
        
        try:
            # API call with simplified parameters
            response = self.client.chat.completions.create(
                messages=[
                    {
                        "role": "system",
                        "content": "You are a quiz generator. Generate multiple choice questions that are clear and focused."
                    },
                    {
                        "role": "user",
                        "content": prompt
                    }
                ],
                model="llama-3.2-3b-preview",
                temperature=0.1,
                max_tokens=1024
            )
            
            # Extract content safely
            content = response.choices[0].message.content
            if not content:
                raise ValueError("Empty response content")
            
            # Parse and validate questions
            questions = self._parse_response(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)}")
            if 'response' in locals():
                print("Response content:", content if 'content' in locals() else None)
            raise QuizGenerationError(f"Failed to generate questions: {str(e)}")
    
    def _create_prompt(self, text: str, num_questions: int) -> str:
        """Create a simple, clear prompt optimized for llama-3.2-3b-preview"""
        return f"""Create {num_questions} multiple choice questions about this text. Return only the JSON array in this exact format:
[
  {{
    "question": "Write the question here?",
    "options": [
      "First option",
      "Second option",
      "Third option",
      "Fourth option"
    ],
    "correct_answer": 0
  }}
]

Rules:
1. Return only the JSON array
2. Each question must have exactly 4 options
3. correct_answer must be 0, 1, 2, or 3
4. No explanations or additional text

Text to use:
{text.strip()}"""

    def _parse_response(self, response_text: str) -> List[Dict]:
        """Parse response with improved error handling"""
        try:
            # Clean up the response text
            cleaned = response_text.strip()
            
            # Remove any markdown formatting
            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]
            
            # Remove any trailing commas before closing brackets
            json_str = re.sub(r',(\s*})', r'\1', json_str)
            json_str = re.sub(r',(\s*])', r'\1', json_str)
            
            # Try to parse the cleaned JSON
            try:
                return json.loads(json_str)
            except json.JSONDecodeError:
                # If that fails, try using ast.literal_eval as a fallback
                import ast
                return ast.literal_eval(json_str)
                
        except Exception as e:
            print(f"Parse error details: {str(e)}")
            print(f"Attempted to parse: {response_text}")
            
            # Last resort: try to fix the JSON manually
            try:
                # Remove any trailing commas and fix newlines
                fixed = re.sub(r',(\s*[}\]])', r'\1', response_text)
                fixed = fixed.replace('}\n{', '},{')
                fixed = fixed.strip()
                if not fixed.startswith('['):
                    fixed = '[' + fixed
                if not fixed.endswith(']'):
                    fixed = fixed + ']'
                return json.loads(fixed)
            except:
                raise ValueError(f"Failed to parse response: {str(e)}")
    
    def _validate_questions(self, questions: List[Dict], num_questions: int) -> List[Question]:
        """Validate questions with strict checking"""
        validated = []
        
        for q in questions[:num_questions]:
            try:
                # Skip invalid questions
                if not isinstance(q, dict):
                    continue
                
                # Check required fields
                if not all(key in q for key in ['question', 'options', 'correct_answer']):
                    continue
                
                # Validate options
                if not isinstance(q['options'], list) or len(q['options']) != 4:
                    continue
                
                # Validate correct_answer
                try:
                    correct_idx = int(q['correct_answer'])
                    if not 0 <= correct_idx <= 3:
                        continue
                except (ValueError, TypeError):
                    continue
                
                # Create validated 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"Validation error: {str(e)}")
                continue
        
        return validated

    def _is_valid_json(self, json_str: str) -> bool:
        """Check if a string is valid JSON"""
        try:
            json.loads(json_str)
            return True
        except:
            return False

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):
        """Add professional border with improved corners"""
        padding = 40
        border_width = 2
        corner_radius = 10
        
        # Draw rounded rectangle border
        x0, y0 = padding, padding
        x1, y1 = self.certificate_size[0] - padding, self.certificate_size[1] - padding
        
        # Draw corners
        draw.arc((x0, y0, x0 + corner_radius * 2, y0 + corner_radius * 2), 180, 270, '#1C1D1F', border_width)
        draw.arc((x1 - corner_radius * 2, y0, x1, y0 + corner_radius * 2), 270, 0, '#1C1D1F', border_width)
        draw.arc((x0, y1 - corner_radius * 2, x0 + corner_radius * 2, y1), 90, 180, '#1C1D1F', border_width)
        draw.arc((x1 - corner_radius * 2, y1 - corner_radius * 2, x1, y1), 0, 90, '#1C1D1F', border_width)
        
        # Draw lines
        draw.line((x0 + corner_radius, y0, x1 - corner_radius, y0), '#1C1D1F', border_width)  # Top
        draw.line((x0 + corner_radius, y1, x1 - corner_radius, y1), '#1C1D1F', border_width)  # Bottom
        draw.line((x0, y0 + corner_radius, x0, y1 - corner_radius), '#1C1D1F', border_width)  # Left
        draw.line((x1, y0 + corner_radius, x1, y1 - corner_radius), '#1C1D1F', border_width)  # Right
    
    def _add_content(
        self,
        draw: ImageDraw.Draw,
        fonts: Dict[str, ImageFont.FreeTypeFont],
        name: str,
        course_name: str,
        score: float,
        y_offset: int = 140
    ):
        """Add content with adjusted vertical positioning"""
        # Add "CERTIFICATE OF COMPLETION" text
        draw.text((60, y_offset), "CERTIFICATE OF COMPLETION", font=fonts['subtitle'], fill='#666666')
        
        # Add course name (large and bold)
        course_name = course_name.strip() or "Assessment"
        draw.text((60, y_offset + 60), course_name, font=fonts['title'], fill='#1C1D1F')
        
        # Add instructor info
        draw.text((60, y_offset + 160), "Instructor", font=fonts['subtitle'], fill='#666666')
        draw.text((60, y_offset + 190), "CertifyMe AI", font=fonts['text'], fill='#1C1D1F')
        
        # Add participant name (large)
        name = name.strip() or "Participant"
        draw.text((60, y_offset + 280), name, font=fonts['name'], fill='#1C1D1F')
        
        # Add date and score info
        date_str = datetime.now().strftime("%b. %d, %Y")
        
        # Date section
        draw.text((60, y_offset + 360), "Date", font=fonts['subtitle'], fill='#666666')
        draw.text((60, y_offset + 390), date_str, font=fonts['text'], fill='#1C1D1F')
        
        # Score section
        draw.text((300, y_offset + 360), "Score", font=fonts['subtitle'], fill='#666666')
        draw.text((300, y_offset + 390), f"{float(score):.1f}%", font=fonts['text'], fill='#1C1D1F')
        
        # Footer section
        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.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):
        """Add a clear circular profile photo in the top-right corner with adjusted position"""
        try:
            if not photo_path or not os.path.exists(photo_path):
                print(f"Photo path does not exist: {photo_path}")
                return
            
            # Open and process photo
            photo = Image.open(photo_path)
            
            # Define size for circular photo
            size = (120, 120)
            
            # Convert to RGB if not already
            if photo.mode not in ('RGB', 'RGBA'):
                photo = photo.convert('RGB')
            
            # Create high-quality circular mask
            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
            aspect = photo.width / photo.height
            if aspect > 1:
                new_height = size[1]
                new_width = int(new_height * aspect)
            else:
                new_width = size[0]
                new_height = int(new_width / aspect)
            
            photo = photo.resize((new_width, max(new_height, 1)), Image.Resampling.LANCZOS)
            
            # Center crop
            if aspect > 1:
                left = (new_width - size[0]) // 2
                photo = photo.crop((left, 0, left + size[0], size[1]))
            else:
                top = (new_height - size[1]) // 2
                photo = photo.crop((0, top, size[0], top + size[1]))
            
            # Create circular photo
            output = Image.new('RGBA', size, (0, 0, 0, 0))
            output.paste(photo, (0, 0))
            output.putalpha(mask)
            
            # Adjusted position - moved down from top
            photo_x = certificate.width - size[0] - 60  # 60px from right
            photo_y = 50  # Increased from 40 to 50px from top
                
            # Add white background circle
            bg = Image.new('RGBA', size, (255, 255, 255, 255))
            certificate.paste(bg, (photo_x, photo_y), mask=mask)
            
            # Paste the photo
            certificate.paste(output, (photo_x, photo_y), mask=output)
            print(f"Successfully added photo at position ({photo_x}, {photo_y})")
            
        except Exception as e:
            print(f"Error adding photo: {str(e)}")
            import traceback
            traceback.print_exc()
    
    def generate(
        self,
        score: float,
        name: str,
        course_name: str,
        company_logo: Optional[str] = None,
        participant_photo: Optional[str] = None
    ) -> str:
        """Generate certificate with improved photo handling"""
        try:
            # Create base certificate
            certificate = Image.new('RGB', self.certificate_size, self.background_color)
            draw = ImageDraw.Draw(certificate)
            
            # Add border
            self._add_professional_border(draw)
            
            # Load fonts
            fonts = self._load_fonts()
            
            # Add company logo if provided
            if company_logo and os.path.exists(company_logo):
                self._add_logo(certificate, company_logo)
            
            # Add participant photo if provided
            if participant_photo:
                print(f"Processing photo: {participant_photo}")  # Debug info
                self._add_photo(certificate, participant_photo)
            
            # Add content
            self._add_content(draw, fonts, str(name), str(course_name), float(score))
            
            # Save certificate
            return self._save_certificate(certificate)
            
        except Exception as e:
            print(f"Error generating certificate: {str(e)}")
            import traceback
            traceback.print_exc()
            return None

    def _create_base_certificate(self) -> Image.Image:
        """Create base certificate with improved background"""
        # Create base image
        certificate = Image.new('RGB', self.certificate_size, self.background_color)
        
        # Add subtle gradient background (optional)
        draw = ImageDraw.Draw(certificate)
        
        # Add very subtle grain texture for professional look (optional)
        width, height = certificate.size
        for x in range(0, width, 4):
            for y in range(0, height, 4):
                if random.random() > 0.5:
                    draw.point((x, y), fill=(250, 250, 250))
        
        return certificate
    
    def _save_certificate(self, certificate: Image.Image) -> str:
        """Save certificate with improved error handling"""
        try:
            temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.png')
            certificate.save(temp_file.name, 'PNG', quality=95)
            print(f"Certificate saved to: {temp_file.name}")  # Debug info
            return temp_file.name
        except Exception as e:
            print(f"Error saving certificate: {str(e)}")
            return None
    
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()