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]:
        prompt = self._create_prompt(text, num_questions)
        
        try:
            response = self.client.chat.completions.create(
                messages=[
                    {
                        "role": "system",
                        "content": "You are a quiz generator. Create clear questions with concise answer options."
                    },
                    {
                        "role": "user",
                        "content": prompt
                    }
                ],
                model="llama-3.2-3b-preview",
                temperature=0.3,
                max_tokens=2048
            )
            
            questions = self._parse_response(response.choices[0].message.content)
            return self._validate_questions(questions, num_questions)
            
        except Exception as e:
            raise QuizGenerationError(f"Failed to generate questions: {str(e)}")
    
    def _create_prompt(self, text: str, num_questions: int) -> str:
        return f"""Create exactly {num_questions} multiple choice questions based on this text:
        {text}
        
        For each question:
        1. Create a clear, concise question
        2. Provide exactly 4 options
        3. Mark the correct answer with the index (0-3)
        4. Ensure options are concise and clear
        
        Return ONLY a JSON array with this EXACT format - no other text:
        [
            {{
                "question": "Question text here?",
                "options": [
                    "Brief option 1",
                    "Brief option 2",
                    "Brief option 3",
                    "Brief option 4"
                ],
                "correct_answer": 0
            }}
        ]
        Keep all options concise (10 words or less each).
        """
    
    def _parse_response(self, response_text: str) -> List[Dict]:
        response_text = response_text.replace("```json", "").replace("```", "").strip()
        start_idx = response_text.find("[")
        end_idx = response_text.rfind("]")
        
        if start_idx == -1 or end_idx == -1:
            raise ValueError("No valid JSON array found in response")
            
        response_text = response_text[start_idx:end_idx + 1]
        return json.loads(response_text)
    
    def _validate_questions(self, questions: List[Dict], num_questions: int) -> List[Question]:
        validated = []
        for q in questions:
            if not self._is_valid_question(q):
                continue
            validated.append(Question(
                question=q["question"].strip(),
                options=[opt.strip()[:100] for opt in q["options"]],
                correct_answer=int(q["correct_answer"]) % 4
            ))
        
        if not validated:
            raise ValueError("No valid questions after validation")
            
        return validated[:num_questions]
    
    def _is_valid_question(self, question: Dict) -> bool:
        return (
            all(key in question for key in ["question", "options", "correct_answer"]) and
            isinstance(question["options"], list) and
            len(question["options"]) == 4 and
            all(isinstance(opt, str) for opt in question["options"])
        )

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", # Provides Liberation fonts (Arial alternative)
                "fontconfig"        # Font configuration
            ], 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"""
        # Liberation Sans is a metric-compatible replacement for Arial
        font_paths = {
            'regular': '/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf',
            'bold': '/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf'
        }
        
        # Fallback paths for different distributions
        fallback_paths = {
            'regular': [
                '/usr/share/fonts/liberation-sans/LiberationSans-Regular.ttf',
                '/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf',
                '/usr/share/fonts/TTF/LiberationSans-Regular.ttf'
            ],
            'bold': [
                '/usr/share/fonts/liberation-sans/LiberationSans-Bold.ttf',
                '/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf',
                '/usr/share/fonts/TTF/LiberationSans-Bold.ttf'
            ]
        }
        
        # Check fallback paths
        for style in ['regular', 'bold']:
            if not os.path.exists(font_paths[style]):
                for path in fallback_paths[style]:
                    if os.path.exists(path):
                        font_paths[style] = path
                        break
        
        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.border_color = '#4682B4'
        self.background_color = '#F0F8FF'
        
        # 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:
            # Use Liberation Sans fonts instead of Arial
            fonts['title'] = ImageFont.truetype(self.font_paths['bold'], 60)
            fonts['text'] = ImageFont.truetype(self.font_paths['regular'], 40)
            fonts['subtitle'] = ImageFont.truetype(self.font_paths['regular'], 30)
        except Exception as e:
            print(f"Font loading error: {e}. Using default font.")
            default = ImageFont.load_default()
            fonts = {
                'title': default,
                'text': default,
                'subtitle': default
            }
        return fonts
        
    def generate(
        self,
        score: float,
        name: str,
        course_name: str,
        company_logo: Optional[str] = None,
        participant_photo: Optional[str] = None
    ) -> str:
        """
        Generate a certificate with custom styling and optional logo/photo
        """
        try:
            certificate = self._create_base_certificate()
            draw = ImageDraw.Draw(certificate)
            
            fonts = self._load_fonts()
            self._add_borders(draw)
            self._add_content(draw, fonts, str(name), str(course_name), float(score))
            self._add_images(certificate, company_logo, 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 _load_fonts(self) -> Dict[str, ImageFont.FreeTypeFont]:
        try:
            return {
                'title': ImageFont.truetype("arial.ttf", 60),
                'text': ImageFont.truetype("arial.ttf", 40),
                'subtitle': ImageFont.truetype("arial.ttf", 30)
            }
        except Exception as e:
            print(f"Font loading error: {e}. Using default font.")
            default = ImageFont.load_default()
            return {'title': default, 'text': default, 'subtitle': default}
    
    def _add_borders(self, draw: ImageDraw.Draw):
        # Main borders
        draw.rectangle([20, 20, 1180, 780], outline=self.border_color, width=3)
        draw.rectangle([40, 40, 1160, 760], outline=self.border_color, width=1)
        
        # Decorative corners
        self._add_decorative_corners(draw)
    
    def _add_decorative_corners(self, draw: ImageDraw.Draw):
        corner_size = 20
        corners = [
            # Top-left
            [(20, 40), (20 + corner_size, 40)],
            [(40, 20), (40, 20 + corner_size)],
            # Top-right
            [(1180 - corner_size, 40), (1180, 40)],
            [(1160, 20), (1160, 20 + corner_size)],
            # Bottom-left
            [(20, 760), (20 + corner_size, 760)],
            [(40, 780 - corner_size), (40, 780)],
            # Bottom-right
            [(1180 - corner_size, 760), (1180, 760)],
            [(1160, 780 - corner_size), (1160, 780)]
        ]
        
        for corner in corners:
            draw.line(corner, fill=self.border_color, width=2)
    
    def _add_content(
        self,
        draw: ImageDraw.Draw,
        fonts: Dict[str, ImageFont.FreeTypeFont],
        name: str,
        course_name: str,
        score: float
    ):
        # Title and headers
        draw.text((600, 100), "CertifyMe AI", font=fonts['title'], fill=self.border_color, anchor="mm")
        draw.text((600, 160), "Certificate of Achievement", font=fonts['subtitle'], fill=self.border_color, anchor="mm")
        
        # Clean inputs
        name = str(name).strip() or "Participant"
        course_name = str(course_name).strip() or "Assessment"
        
        # Main content
        content = [
            (300, "This is to certify that", 'black'),
            (380, name, self.border_color),
            (460, "has successfully completed", 'black'),
            (540, course_name, self.border_color),
            (620, f"with a score of {float(score):.1f}%", 'black'),
            (700, datetime.now().strftime("%B %d, %Y"), 'black')
        ]
        
        for y, text, color in content:
            draw.text((600, y), text, font=fonts['text'], fill=color, anchor="mm")
    
    def _add_images(
        self,
        certificate: Image.Image,
        company_logo: Optional[str],
        participant_photo: Optional[str]
    ):
        if company_logo:
            self._add_image(certificate, company_logo, (50, 50))
        if participant_photo:
            self._add_image(certificate, participant_photo, (1000, 50))
    
    def _add_image(self, certificate: Image.Image, image_path: str, position: Tuple[int, int]):
        try:
            img = Image.open(image_path)
            img.thumbnail((150, 150))
            certificate.paste(img, position)
        except Exception as e:
            print(f"Error adding image: {e}")
    
    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([])
        
        # UI Components layout
        gr.Markdown("""
        # 🎓 CertifyMe AI
        ### Transform Your Knowledge into Recognized Achievements
        """)
        
        with gr.Tabs() as tabs:
            # Profile Setup Tab
            with gr.Tab("📋 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=5,
                    value=3,
                    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("📝 Step 2: Take Assessment"):
                feedback_box = gr.Markdown("")
                question_box = gr.Markdown("")
                answers = [
                    gr.Radio(choices=[], label=f"Question {i+1}", visible=False)
                    for i in range(5)
                ]
                submit_btn = gr.Button("Submit Assessment", variant="primary", size="lg")
            
            # Certification Tab
            with gr.Tab("🎓 Step 3: Get Certified"):
                score_display = gr.Number(label="Your Score")
                result_message = gr.Markdown("")
                course_name = gr.Textbox(
                    label="Certification Title",
                    value="Professional Assessment Certification"
                )
                certificate_display = gr.Image(label="Your Certificate")
        
        # Event handlers

        generate_btn.click(
            fn=quiz_app.update_questions,
            inputs=[text_input, num_questions],
            outputs=[
                question_box,
                feedback_box,
                *answers,
                current_questions,
                tabs
            ]
        )
        
        submit_btn.click(
            fn=quiz_app.submit_quiz,
            inputs=[*answers, current_questions],
            outputs=[
                feedback_box,
                *answers,
                score_display,
                result_message,
                tabs
            ]
        )
        
        score_display.change(
            fn=quiz_app.certificate_generator.generate,
            inputs=[score_display, name, course_name, company_logo, participant_photo],
            outputs=certificate_display
        )
    
    return demo

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