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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Image SVD Processor</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 1000px;
            margin: 0 auto;
            padding: 15px;
            background-color: #f5f5f5;
        }
        .container {
            background-color: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        h1 {
            text-align: center;
            background-color: #3498db;
            color: #fff;
            padding: 20px;
            margin: 0 0 20px 0;
            border-radius: 8px;
        }
        .controls {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin: 10px 0;
            padding: 10px;
            background-color: #f8f9fa;
            border-radius: 8px;
            gap: 10px;
        }
        .image-selection {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .predefined-images, .upload-section {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }
        .slider-container {
            flex: 0 0 40%;
            margin-left: auto;
            text-align: right;
        }
        #r-value {
            width: 80%;
        }
        .image-container {
            display: flex;
            justify-content: space-between;
            margin-top: 15px;
            flex-wrap: wrap;
            gap: 15px;
        }
        .image-box {
            flex: 1;
            min-width: 250px;
            text-align: center;
            margin-bottom: 15px;
            padding: 10px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            position: relative;
        }
        .image-box img {
            max-width: 100%;
            max-height: 300px;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 8px;
            background: #fff;
        }
        .loading-overlay {
            display: none;
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(255,255,255,0.8);
            justify-content: center;
            align-items: center;
        }
        .spinner {
            width: 50px; height: 50px;
            border: 5px solid #f3f3f3;
            border-top: 5px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% {transform: rotate(0deg);}
            100% {transform: rotate(360deg);}
        }
        .info {
            margin-top: 10px;
            color: #666;
            padding: 5px;
            background: #f8f9fa;
            border-radius: 4px;
        }
        input[type="file"] {
            padding: 5px;
            border: none;
            background: transparent;
        }
        input[type="file"]::-webkit-file-upload-button {
            background: #3498db;
            color: white;
            padding: 8px 16px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        input[type="range"] {
            height: 8px;
            -webkit-appearance: none;
            margin: 10px 0;
            background: #ddd;
            border-radius: 4px;
        }
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            background: #3498db;
            border-radius: 50%;
            cursor: pointer;
        }
        .storage-info {
            font-size: 0.9em;
            color: #666;
            margin-top: 5px;
            text-align: left;
            padding: 8px;
            background: #f8f9fa;
            border-radius: 4px;
        }
        .storage-details {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }
        .storage-row {
            display: flex;
            justify-content: space-between;
        }
        .highlight {
            color: #3498db;
            font-weight: bold;
        }
        .or-divider {
            display: flex;
            align-items: center;
            color: #666;
            font-size: 0.9em;
            padding: 5px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Image SVD Processor</h1>
        <div class="controls">
            <div class="image-selection">
                <div class="predefined-images">
                    <label for="predefinedImage" style="margin-top: -5px;padding-bottom: 5px;">Select a predefined image:</label>
                    <select id="predefinedImage" style="height: 30px;">
                        <option value="">-- Select an image --</option>
                        {% for image in predefined_images %}
                        <option value="{{ image.path }}">{{ image.name }}</option>
                        {% endfor %}
                    </select>
                </div>
                <div class="or-divider">
                    <span>OR</span>
                </div>
                <div class="upload-section">
                    <label for="imageInput">Upload your own image:</label>
                    <input type="file" id="imageInput" accept="image/*">
                </div>
            </div>
            <div class="slider-container" style="margin-top: 10px;">
                <label for="r-value">R Value: <span id="r-value-display">5</span></label>
                <input type="range" id="r-value" min="1" max="100" value="5">
            </div>
        </div>

        <div class="image-container">
            <div class="image-box">
                <h3>Original Image</h3>
                <img id="originalImage" src="" alt="Original image will appear here">
                <div class="info" id="originalInfo"></div>
                <div class="storage-info">
                    <div class="storage-details" id="originalStorage">
                        <div class="storage-row">
                            <span>Storage (bytes):</span>
                            <span class="highlight">-</span>
                        </div>
                        <div class="storage-row">
                            <span>Dimensions:</span>
                            <span>height × width × channels</span>
                        </div>
                    </div>
                </div>
            </div>
            <div class="image-box">
                <h3>Processed Image</h3>
                <img id="processedImage" src="" alt="Processed image will appear here">
                <div class="info" id="processedInfo"></div>
                <div class="storage-info">
                    <div class="storage-details" id="processedStorage">
                        <div class="storage-row">
                            <span>Storage (bytes):</span>
                            <span class="highlight">-</span>
                        </div>
                        <div class="storage-row">
                            <span>SVD Components:</span>
                            <span>U×r + r + V×r</span>
                        </div>
                        <div class="storage-row">
                            <span>Compression Ratio:</span>
                            <span class="highlight">-</span>
                        </div>
                    </div>
                </div>
                <div class="loading-overlay" id="loading">
                    <div class="spinner"></div>
                </div>
            </div>
        </div>
    </div>

    <script>
        let originalImage = document.getElementById('originalImage');
        let processedImage = document.getElementById('processedImage');
        let rValue = document.getElementById('r-value');
        let rValueDisplay = document.getElementById('r-value-display');
        let loading = document.getElementById('loading');
        let imageInput = document.getElementById('imageInput');
        let predefinedSelect = document.getElementById('predefinedImage');
        let maxR = 100;
        let currentImage = null;

        // Function to load first predefined image
        function loadFirstPredefinedImage() {
            if (predefinedSelect.options.length > 1) {  // if we have any predefined images
                predefinedSelect.selectedIndex = 1;  // select first image (index 0 is the placeholder)
                const selectedImageUrl = predefinedSelect.value;
                if (selectedImageUrl) {
                    originalImage.src = selectedImageUrl;
                    processImageFromUrl(selectedImageUrl);
                }
            }
        }

        // Load first image when page loads
        window.addEventListener('load', loadFirstPredefinedImage);

        document.getElementById('predefinedImage').addEventListener('change', function(e) {
            if (e.target.value) {
                imageInput.value = '';
                originalImage.src = e.target.value;
                processImageFromUrl(e.target.value);
            }
        });

        imageInput.addEventListener('change', function(e) {
            if (e.target.files && e.target.files[0]) {
                document.getElementById('predefinedImage').value = '';
                let reader = new FileReader();
                reader.onload = function(e) {
                    originalImage.src = e.target.result;
                    currentImage = imageInput.files[0];
                    processImage();
                }
                reader.readAsDataURL(e.target.files[0]);
            }
        });

        async function processImageFromUrl(imageUrl) {
            loading.style.display = 'flex';
            const formData = new FormData();
            formData.append('image_url', imageUrl);
            formData.append('r_value', rValue.value);
            try {
                const response = await fetch('/process', {method: 'POST', body: formData});
                
                // Check if response is ok (status 200-299)
                if (!response.ok) {
                    const text = await response.text();
                    console.error('Server response error:', response.status, text);
                    throw new Error(`Server error: ${response.status}. Check console for details.`);
                }
                
                // Try parsing the response as JSON
                let data;
                try {
                    data = await response.json();
                } catch (parseError) {
                    console.error('JSON parse error:', parseError);
                    const text = await response.text();
                    console.error('Raw response:', text);
                    throw new Error('Failed to parse server response as JSON');
                }
                
                // Check for error in JSON response
                if (data.error) {
                    console.error('API error:', data.error);
                    if (data.traceback) console.error('Traceback:', data.traceback);
                    throw new Error(data.error);
                }
                
                // Process successful response
                processedImage.src = 'data:image/png;base64,' + data.processed_image;
                maxR = data.max_r;
                rValue.max = maxR;
                
                // Update storage information
                document.getElementById('originalStorage').innerHTML = `
                    <div class="storage-row">
                        <span>Storage (bytes):</span>
                        <span class="highlight">${data.storage.original.toLocaleString()}</span>
                    </div>
                    <div class="storage-row">
                        <span>Dimensions:</span>
                        <span>${data.dimensions.join(' × ')}</span>
                    </div>`;
                document.getElementById('processedStorage').innerHTML = `
                    <div class="storage-row">
                        <span>Storage (bytes):</span>
                        <span class="highlight">${data.storage.compressed.toLocaleString()}</span>
                    </div>
                    <div class="storage-row">
                        <span>SVD Components:</span>
                        <span>${data.dimensions[0]}×${rValue.value} + ${rValue.value} + ${data.dimensions[1]}×${rValue.value}</span>
                    </div>
                    <div class="storage-row">
                        <span>Compression Ratio:</span>
                        <span class="highlight">${data.storage.compression_ratio.toFixed(2)}:1</span>
                    </div>`;
                document.getElementById('originalInfo').textContent =
                    `Dimensions: ${data.dimensions.join(' × ')}`;
                document.getElementById('processedInfo').textContent =
                    `Using ${rValue.value} of ${maxR} singular values`;
            } catch (error) {
                console.error('Error details:', error);
                alert('Error processing image: ' + error.message);
            } finally {
                loading.style.display = 'none';
            }
        }

        rValue.addEventListener('input', function() {
            rValueDisplay.textContent = this.value;
            const predefinedImage = document.getElementById('predefinedImage');
            if (predefinedImage.value) {
                processImageFromUrl(predefinedImage.value);
            } else if (currentImage) {
                processImage();
            }
        });

        async function processImage() {
            if (!currentImage) {return;}
            loading.style.display = 'flex';
            const formData = new FormData();
            formData.append('image', currentImage);
            formData.append('r_value', rValue.value);
            try {
                const response = await fetch('/process', {method: 'POST', body: formData});
                const data = await response.json();
                if (data.error) {
                    alert('Error: ' + data.error);
                    return;
                }
                processedImage.src = 'data:image/png;base64,' + data.processed_image;
                maxR = data.max_r;
                rValue.max = maxR;
                document.getElementById('originalStorage').innerHTML = `
                    <div class="storage-row">
                        <span>Storage (bytes):</span>
                        <span class="highlight">${data.storage.original.toLocaleString()}</span>
                    </div>
                    <div class="storage-row">
                        <span>Dimensions:</span>
                        <span>${data.dimensions.join(' × ')}</span>
                    </div>`;
                document.getElementById('processedStorage').innerHTML = `
                    <div class="storage-row">
                        <span>Storage (bytes):</span>
                        <span class="highlight">${data.storage.compressed.toLocaleString()}</span>
                    </div>
                    <div class="storage-row">
                        <span>SVD Components:</span>
                        <span>${data.dimensions[0]}×${rValue.value} + ${rValue.value} + ${data.dimensions[1]}×${rValue.value}</span>
                    </div>
                    <div class="storage-row">
                        <span>Compression Ratio:</span>
                        <span class="highlight">${data.storage.compression_ratio.toFixed(2)}:1</span>
                    </div>`;
                document.getElementById('originalInfo').textContent =
                    `Dimensions: ${data.dimensions.join(' × ')}`;
                document.getElementById('processedInfo').textContent =
                    `Using ${rValue.value} of ${maxR} singular values`;
            } catch (error) {
                alert('Error processing image: ' + error.message);
            } finally {
                loading.style.display = 'none';
            }
        }
    </script>
</body>
</html>