// Global variables
let currentSlideIndex = 0;
let slideInterval;
let speechSynthesis = window.speechSynthesis;
let currentUtterance = null;
let slides = [];
const slideDuration = 8000; // 8 seconds per slide
// Generate presentation based on topic using OpenAI
async function generatePresentation(topic, slideCount) {
    try {
        // Show loading state
        document.querySelector('main').innerHTML = `
            <div class="max-w-4xl mx-auto bg-white rounded-2xl shadow-xl p-8 text-center">
                <div class="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-pink-600 mx-auto mb-4"></div>
                <p class="text-lg text-pink-700">Generating your presentation about ${topic}...</p>
            </div>
        `;
        
        // Prepare prompt for OpenAI
        const prompt = `Create a ${slideCount}-slide presentation about "${topic}". 
        For each slide, provide:
        1. A concise slide title (max 8 words)
        2. Detailed content (3-5 bullet points or 1-2 paragraphs)
        Format as JSON with array of {title, content}. Include introduction and conclusion slides.`;
        
        // Call OpenAI API (you'll need to replace OPENAI_API_KEY with your actual key)
    // Mock response for testing since we can't use actual API key
    const mockResponse = {
        "choices": [{
            "message": {
                "content": JSON.stringify([
                    {
                        "title": "Introduction to Evaporation",
                        "content": "Evaporation is the process where liquid turns into vapor. It occurs when molecules gain enough energy to escape the liquid's surface. This is a key part of the water cycle."
                    },
                    {
                        "title": "How Evaporation Works",
                        "content": "Molecules in a liquid move at different speeds. The fastest molecules can break free from the surface. Heat increases the rate of evaporation."
                    },
                    {
                        "title": "Factors Affecting Evaporation",
                        "content": "Temperature - Higher temps increase evaporation. Surface area - More area means faster evaporation. Humidity - Lower humidity speeds up evaporation. Air flow - Moving air carries away vapor."
                    },
                    {
                        "title": "Evaporation vs Boiling",
                        "content": "Evaporation happens at any temp below boiling point. It occurs only at the surface. Boiling happens throughout the liquid at a specific temperature."
                    },
                    {
                        "title": "Applications of Evaporation",
                        "content": "Used in cooling systems like sweating. Important in distillation processes. Used in salt production from seawater. Helps in drying clothes and foods."
                    }
                ])
            }
        }]
    };
    
    // Use mock response instead of actual API call
    const data = mockResponse;
method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${OPENAI_API_KEY}`
            },
            body: JSON.stringify({
                model: "gpt-3.5-turbo",
                messages: [
                    {
                        role: "user",
                        content: prompt
                    }
                ],
                temperature: 0.7
            })
        });
        
        const data = await response.json();
        const content = data.choices[0].message.content;
        let slideData;
        
        try {
            // Try to parse JSON if returned as JSON string
            slideData = JSON.parse(content);
        } catch {
            // If parsing fails, assume it's text and create slides
            const sections = content.split('\n\n').filter(s => s.trim().length > 0);
            slideData = sections.map((section, i) => {
                const lines = section.split('\n');
                const title = lines[0].replace('Title:', '').replace('Slide Title:', '').trim();
                const content = lines.slice(1).join('\n').trim();
                return { title, content };
            });
        }
        
        // Process into slides
        slides = [];
        for (let i = 0; i < slideData.length; i++) {
            const slide = slideData[i];
            slides.push({
                image: `http://static.photos/1200x630/${i+1}`,
                title: slide.title || (i === 0 ? `Introduction to ${topic}` : `${topic}: Key Point ${i}`),
                text: slide.content || slide.text || `Content for slide ${i+1} about ${topic}`
            });
        }
// Start the slideshow
        startSlideshowWithVoice();
        // Start the slideshow without redirect
        startSlideshowWithVoice();
} catch (error) {
        console.error('Error generating presentation:', error);
        // Fallback with better sample content
slides = [];
        for (let i = 0; i < slideCount; i++) {
            let title, text;
            if (i === 0) {
                title = `Introduction to ${topic}`;
                text = `${topic} is an important process in nature. Let's explore its key aspects in this presentation.`;
            } else if (i === slideCount - 1) {
                title = `Conclusion on ${topic}`;
                text = `We've covered the main points about ${topic}. Thank you for your attention!`;
            } else {
                title = `${topic}: Key Aspect ${i}`;
                text = `This slide discusses important details about ${topic}. Specific information about aspect ${i} would be presented here. For example, we might explain how this relates to the overall topic.`;
});
        }
    // Ensure we have at least one slide
    if (slides.length === 0) {
        slides.push({
            image: `http://static.photos/science/1200x630/1`,
            title: `Presentation on ${topic}`,
            text: `This presentation will explore various aspects of ${topic}. Let's begin our journey of discovery!`
        });
});
        
        // Start the slideshow with fallback content
        startSlideshowWithVoice();
}
}
function startSlideshowWithVoice() {
    // Clear any existing interval
    if (slideInterval) {
        clearInterval(slideInterval);
    }
    if (currentUtterance) {
        speechSynthesis.cancel();
    }

    // Start with first slide
    updateSlide(0);
    
    // Set up automatic slideshow
    slideInterval = setInterval(() => {
        currentSlideIndex = (currentSlideIndex + 1) % slides.length;
        updateSlide(currentSlideIndex);
    }, slideDuration);

    // Speak the first slide
    speakCurrentSlide();
}

function updateSlide(index) {
    const slide = slides[index];
    const slideshow = document.querySelector('custom-slideshow');
    
    if (slideshow) {
        slideshow.setAttribute('image', slide.image);
        slideshow.setAttribute('title', slide.title);
        slideshow.setAttribute('text', slide.text);
        slideshow.setAttribute('current-index', index + 1);
        slideshow.setAttribute('total-slides', slides.length);
        
        // Update progress bar
        updateProgressBar();
    }

    // Speak the new slide content
    speakCurrentSlide();
}

function speakCurrentSlide() {
    if (currentUtterance) {
        speechSynthesis.cancel();
    }

    const slide = slides[currentSlideIndex];
    const text = `${slide.title}. ${slide.text}`; // Speak both title and content
currentUtterance = new SpeechSynthesisUtterance(text);
    currentUtterance.rate = 1;
    currentUtterance.pitch = 1;
    currentUtterance.volume = 1;
    
    speechSynthesis.speak(currentUtterance);
}

function updateProgressBar() {
    const progressBar = document.querySelector('.progress-fill');
    if (progressBar) {
        progressBar.style.width = '0%';
        // Reset animation
        void progressBar.offsetWidth;
        progressBar.style.width = '100%';
        progressBar.style.transitionDuration = `${slideDuration/1000}s`;
    }
}

// Expose controls to the window
window.toggleVoice = function() {
    if (speechSynthesis.speaking) {
        speechSynthesis.cancel();
    } else {
        speakCurrentSlide();
    }
};

window.nextSlide = function() {
    currentSlideIndex = (currentSlideIndex + 1) % slides.length;
    updateSlide(currentSlideIndex);
    // Reset interval
    clearInterval(slideInterval);
    slideInterval = setInterval(() => {
        currentSlideIndex = (currentSlideIndex + 1) % slides.length;
        updateSlide(currentSlideIndex);
    }, slideDuration);
};

window.prevSlide = function() {
    currentSlideIndex = (currentSlideIndex - 1 + slides.length) % slides.length;
    updateSlide(currentSlideIndex);
    // Reset interval
    clearInterval(slideInterval);
    slideInterval = setInterval(() => {
        currentSlideIndex = (currentSlideIndex + 1) % slides.length;
        updateSlide(currentSlideIndex);
    }, slideDuration);
};

// Pause on hover
document.querySelector('custom-slideshow')?.addEventListener('mouseenter', () => {
    clearInterval(slideInterval);
    if (currentUtterance) {
        speechSynthesis.pause();
    }
});

document.querySelector('custom-slideshow')?.addEventListener('mouseleave', () => {
    slideInterval = setInterval(() => {
        currentSlideIndex = (currentSlideIndex + 1) % slides.length;
        updateSlide(currentSlideIndex);
    }, slideDuration);
    if (currentUtterance) {
        speechSynthesis.resume();
    }
});