document.addEventListener('DOMContentLoaded', function() {
    // Initialize UI elements
    const dropArea = document.getElementById('drop-area');
    const fileInput = document.getElementById('file-input');
    const convertBtn = document.getElementById('convert-btn');
    const convertText = document.getElementById('convert-text');
    const convertSpinner = document.getElementById('convert-spinner');
    const resultsSection = document.getElementById('results');
    const originalContainer = document.getElementById('original-container');
    const resultContainer = document.getElementById('result-container');
    const svgCode = document.getElementById('svg-code');
    const downloadBtn = document.getElementById('download-btn');
    const copyBtn = document.getElementById('copy-btn');
    const fileInfo = document.getElementById('file-info');
    const zoomControls = document.getElementById('zoom-controls');
    const zoomInBtn = document.getElementById('zoom-in');
    const zoomOutBtn = document.getElementById('zoom-out');
    const zoomResetBtn = document.getElementById('zoom-reset');
    const colorModeToggle = document.getElementById('color-mode');
    const colorModeLabel = document.getElementById('color-mode-label');
    const colorSettings = document.getElementById('color-settings');
    const colorCount = document.getElementById('color-count');
    const colorCountValue = document.getElementById('color-count-value');
    const detailLevel = document.getElementById('detail-level');
    const smoothness = document.getElementById('smoothness');
    const smoothnessValue = document.getElementById('smoothness-value');
    const outputFormat = document.getElementById('output-format');
    
    let uploadedFile = null;
    let scale = 1;
    let canvas = null;
    let svgPreview = null;
    let isDragging = false;
    let startPos = { x: 0, y: 0 };
    let translate = { x: 0, y: 0 };
    // Initialize event listeners
    initEventListeners();
    
    function initEventListeners() {
        // Drag and drop handlers
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            dropArea.addEventListener(eventName, preventDefaults, false);
            document.body.addEventListener(eventName, preventDefaults, false);
        });
        
        ['dragenter', 'dragover'].forEach(eventName => {
            dropArea.addEventListener(eventName, highlight, false);
        });
        
        ['dragleave', 'drop'].forEach(eventName => {
            dropArea.addEventListener(eventName, unhighlight, false);
        });
        
        dropArea.addEventListener('drop', handleDrop, false);
        fileInput.addEventListener('change', handleFiles, false);
        convertBtn.addEventListener('click', convertToSVG);
        downloadBtn.addEventListener('click', downloadSVG);
        copyBtn.addEventListener('click', copySVGCode);
        
        // Color mode toggle
        colorModeToggle.addEventListener('change', toggleColorMode);
        colorCount.addEventListener('input', updateColorCount);
        smoothness.addEventListener('input', updateSmoothness);
        
        // Zoom controls
        zoomInBtn.addEventListener('click', () => zoomImage(1.2));
        zoomOutBtn.addEventListener('click', () => zoomImage(0.8));
        zoomResetBtn.addEventListener('click', resetZoom);
        
        // SVG preview interactions
        resultContainer.addEventListener('mousedown', startDrag);
        document.addEventListener('mousemove', dragImage);
        document.addEventListener('mouseup', endDrag);
        resultContainer.addEventListener('touchstart', startDrag);
        document.addEventListener('touchmove', dragImage);
        document.addEventListener('touchend', endDrag);
    }
function preventDefaults(e) {
        e.preventDefault();
        e.stopPropagation();
    }
    
    function highlight() {
        dropArea.classList.add('highlight');
    }
    
    function unhighlight() {
        dropArea.classList.remove('highlight');
    }
    
    function handleDrop(e) {
        const dt = e.dataTransfer;
        const files = dt.files;
        handleFiles({ target: { files } });
    }
    function handleFiles(e) {
        const files = e.target.files;
        if (files.length) {
            const file = files[0];
            if (!file.type.match('image.*')) {
                alert('Please upload an image file (JPG, PNG etc.)');
                return;
            }
            uploadedFile = file;
            displayOriginalImage(uploadedFile);
        }
    }
    function displayOriginalImage(file) {
        const reader = new FileReader();
        reader.onload = function(e) {
            const img = document.createElement('img');
            img.onload = function() {
                URL.revokeObjectURL(this.src);
                updateFileInfo(file, this.width, this.height);
            };
            img.src = e.target.result;
            img.className = 'max-w-full max-h-full';
            originalContainer.innerHTML = '';
            originalContainer.appendChild(img);
        };
        reader.readAsDataURL(file);
    }

    function updateFileInfo(file, width, height) {
        const sizeMB = (file.size / (1024 * 1024)).toFixed(2);
        fileInfo.innerHTML = `
            ${file.name} | ${width}×${height}px | ${sizeMB}MB
        `;
    }
    function convertToSVG() {
        if (!uploadedFile) {
            showAlert('Please upload an image first');
            return;
        }
        
        // Show loading state
        convertBtn.disabled = true;
        convertText.textContent = 'Processing...';
        convertSpinner.classList.remove('hidden');
        
        // Process image (simplified example - in production you would use a proper vectorization algorithm)
        setTimeout(() => {
            const img = new Image();
            img.onload = function() {
                const canvas = document.createElement('canvas');
                const ctx = canvas.getContext('2d');
                canvas.width = img.width;
                canvas.height = img.height;
                ctx.drawImage(img, 0, 0);
                
                // Get conversion settings
                const isColor = colorModeToggle.checked;
                const colorCountVal = parseInt(colorCount.value);
                const smoothnessVal = parseInt(smoothness.value);
                const detailLevelVal = detailLevel.value;
                
                // Process image based on settings (simplified)
                const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
                const data = imageData.data;
                
                if (!isColor) {
                    // Monochrome conversion
                    const threshold = 128; // Default threshold
                    for (let i = 0; i < data.length; i += 4) {
                        const avg = (data[i] + data[i + 1] + data[i + 2]) / 3;
                        const val = avg > threshold ? 255 : 0;
                        data[i] = data[i + 1] = data[i + 2] = val;
                    }
                } else {
                    // Color quantization (simplified)
                    // In a real app, you would use a proper quantization algorithm
                    const step = Math.floor(256 / colorCountVal);
                    for (let i = 0; i < data.length; i += 4) {
                        data[i] = Math.floor(data[i] / step) * step;   // R
                        data[i+1] = Math.floor(data[i+1] / step) * step; // G
                        data[i+2] = Math.floor(data[i+2] / step) * step; // B
                    }
                }
                
                ctx.putImageData(imageData, 0, 0);
                
                // Generate SVG (simplified - real implementation would use vector paths)
                const canvasDataURL = canvas.toDataURL('image/png');
                const svg = `<svg viewBox="0 0 ${img.width} ${img.height}" xmlns="http://www.w3.org/2000/svg">
                    <image href="${canvasDataURL}" width="${img.width}" height="${img.height}"/>
                </svg>`;
                
                // Display result
                displaySVGResult(svg, img.width, img.height);
                
                // Reset button state
                convertBtn.disabled = false;
                convertText.textContent = 'Convert to Vector';
                convertSpinner.classList.add('hidden');
            };
            
            img.src = URL.createObjectURL(uploadedFile);
        }, 500); // Simulate processing time
    }
    function displaySVGResult(svg, width, height) {
        resultContainer.innerHTML = '';
        const svgBlob = new Blob([svg], {type: 'image/svg+xml'});
        const svgUrl = URL.createObjectURL(svgBlob);
        
        svgPreview = document.createElement('img');
        svgPreview.src = svgUrl;
        svgPreview.className = 'max-w-full max-h-full transform origin-center';
        svgPreview.style.transform = `scale(${scale}) translate(${translate.x}px, ${translate.y}px)`;
        resultContainer.appendChild(svgPreview);
        
        svgCode.textContent = svg;
        resultsSection.classList.remove('hidden');
        zoomControls.classList.remove('hidden');
        
        // Scroll to results
        resultsSection.scrollIntoView({ behavior: 'smooth' });
    }

    function toggleColorMode() {
        const isColor = colorModeToggle.checked;
        colorModeLabel.textContent = isColor ? 'Color' : 'Monochrome';
        colorSettings.style.display = isColor ? 'block' : 'none';
    }

    function updateColorCount() {
        colorCountValue.textContent = colorCount.value;
    }

    function updateSmoothness() {
        smoothnessValue.textContent = smoothness.value;
    }

    function zoomImage(factor) {
        scale *= factor;
        updateImageTransform();
    }

    function resetZoom() {
        scale = 1;
        translate = { x: 0, y: 0 };
        updateImageTransform();
    }

    function startDrag(e) {
        if (!svgPreview) return;
        isDragging = true;
        startPos = {
            x: e.clientX || e.touches[0].clientX,
            y: e.clientY || e.touches[0].clientY
        };
        resultContainer.classList.add('dragging');
        e.preventDefault();
    }

    function dragImage(e) {
        if (!isDragging || !svgPreview) return;
        const currentPos = {
            x: e.clientX || e.touches[0].clientX,
            y: e.clientY || e.touches[0].clientY
        };
        translate.x += (currentPos.x - startPos.x) / scale;
        translate.y += (currentPos.y - startPos.y) / scale;
        startPos = currentPos;
        updateImageTransform();
        e.preventDefault();
    }

    function endDrag() {
        isDragging = false;
        resultContainer.classList.remove('dragging');
    }

    function updateImageTransform() {
        if (svgPreview) {
            svgPreview.style.transform = `scale(${scale}) translate(${translate.x}px, ${translate.y}px)`;
        }
    }
    function showAlert(message, type = 'error') {
        const bgColor = type === 'error' ? 'bg-red-100 border-red-500 text-red-700' : 'bg-green-100 border-green-500 text-green-700';
const alert = document.createElement('div');
        alert.className = `fixed top-4 right-4 ${bgColor} border-l-4 p-4 rounded shadow-lg z-50`;
alert.innerHTML = `
            <div class="flex items-center gap-2">
                <i data-feather="alert-triangle"></i>
                <span>${message}</span>
            </div>
        `;
        document.body.appendChild(alert);
        feather.replace();
        
        setTimeout(() => {
            alert.classList.add('opacity-0', 'transition-opacity', 'duration-300');
            setTimeout(() => alert.remove(), 300);
        }, 3000);
    }
});