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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>Brain Tumor Detection</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            padding: 40px;
            max-width: 500px;
            width: 100%;
        }

        h1 {
            text-align: center;
            color: #1a1a2e;
            margin-bottom: 10px;
            font-size: 28px;
        }

        .subtitle {
            text-align: center;
            color: #666;
            margin-bottom: 30px;
            font-size: 14px;
        }

        .upload-area {
            border: 3px dashed #ddd;
            border-radius: 15px;
            padding: 40px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 20px;
        }

        .upload-area:hover {
            border-color: #4a90a4;
            background: #f8f9fa;
        }

        .upload-area.dragover {
            border-color: #4a90a4;
            background: #e8f4f8;
        }

        .upload-icon {
            font-size: 50px;
            margin-bottom: 15px;
        }

        .upload-text {
            color: #666;
            font-size: 16px;
        }

        .upload-text span {
            color: #4a90a4;
            font-weight: bold;
        }

        #fileInput {
            display: none;
        }

        .preview-container {
            display: none;
            margin-bottom: 20px;
        }

        .preview-container img {
            width: 100%;
            max-height: 300px;
            object-fit: contain;
            border-radius: 10px;
            border: 2px solid #eee;
        }

        .file-name {
            text-align: center;
            color: #666;
            font-size: 14px;
            margin-top: 10px;
        }

        .btn {
            width: 100%;
            padding: 15px;
            border: none;
            border-radius: 10px;
            font-size: 18px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-predict {
            background: linear-gradient(135deg, #4a90a4 0%, #357a8c 100%);
            color: white;
        }

        .btn-predict:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(74, 144, 164, 0.4);
        }

        .btn-predict:disabled {
            background: #ccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .result-container {
            display: none;
            margin-top: 25px;
            padding: 25px;
            border-radius: 15px;
            text-align: center;
        }

        .result-tumor {
            background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
            color: white;
        }

        .result-no-tumor {
            background: linear-gradient(135deg, #51cf66 0%, #40c057 100%);
            color: white;
        }

        .result-title {
            font-size: 24px;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .result-confidence {
            font-size: 16px;
            opacity: 0.9;
        }

        .loading {
            display: none;
            text-align: center;
            margin-top: 20px;
        }

        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #4a90a4;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto 15px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .error-message {
            display: none;
            background: #fff3f3;
            border: 1px solid #ff6b6b;
            color: #d63031;
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
            text-align: center;
        }

        .reset-btn {
            display: none;
            margin-top: 15px;
            background: #6c757d;
            color: white;
        }

        .reset-btn:hover {
            background: #5a6268;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>🧠 Brain Tumor Detection</h1>
        <p class="subtitle">Upload an MRI scan image for AI-powered analysis</p>

        <div class="upload-area" id="uploadArea">
            <div class="upload-icon">📤</div>
            <p class="upload-text">Drag & drop your image here<br>or <span>click to browse</span></p>
            <input type="file" id="fileInput" accept="image/*">
        </div>

        <div class="preview-container" id="previewContainer">
            <img id="previewImage" src="" alt="Preview">
            <p class="file-name" id="fileName"></p>
        </div>

        <button class="btn btn-predict" id="predictBtn" disabled>Analyze Image</button>

        <div class="loading" id="loading">
            <div class="spinner"></div>
            <p>Analyzing image...</p>
        </div>

        <div class="error-message" id="errorMessage"></div>

        <div class="result-container" id="resultContainer">
            <p class="result-title" id="resultTitle"></p>
            <p class="result-confidence" id="resultConfidence"></p>
        </div>

        <button class="btn reset-btn" id="resetBtn">Upload New Image</button>
    </div>

    <script>
        const uploadArea = document.getElementById('uploadArea');
        const fileInput = document.getElementById('fileInput');
        const previewContainer = document.getElementById('previewContainer');
        const previewImage = document.getElementById('previewImage');
        const fileName = document.getElementById('fileName');
        const predictBtn = document.getElementById('predictBtn');
        const loading = document.getElementById('loading');
        const resultContainer = document.getElementById('resultContainer');
        const resultTitle = document.getElementById('resultTitle');
        const resultConfidence = document.getElementById('resultConfidence');
        const errorMessage = document.getElementById('errorMessage');
        const resetBtn = document.getElementById('resetBtn');

        let selectedFile = null;

        // Click to upload
        uploadArea.addEventListener('click', () => fileInput.click());

        // Drag and drop
        uploadArea.addEventListener('dragover', (e) => {
            e.preventDefault();
            uploadArea.classList.add('dragover');
        });

        uploadArea.addEventListener('dragleave', () => {
            uploadArea.classList.remove('dragover');
        });

        uploadArea.addEventListener('drop', (e) => {
            e.preventDefault();
            uploadArea.classList.remove('dragover');
            const files = e.dataTransfer.files;
            if (files.length) handleFile(files[0]);
        });

        // File input change
        fileInput.addEventListener('change', (e) => {
            if (e.target.files.length) handleFile(e.target.files[0]);
        });

        function handleFile(file) {
            if (!file.type.startsWith('image/')) {
                showError('Please upload an image file (PNG, JPG, JPEG)');
                return;
            }

            selectedFile = file;
            fileName.textContent = file.name;

            const reader = new FileReader();
            reader.onload = (e) => {
                previewImage.src = e.target.result;
                previewContainer.style.display = 'block';
                uploadArea.style.display = 'none';
                predictBtn.disabled = false;
                hideError();
                resultContainer.style.display = 'none';
                resetBtn.style.display = 'none';
            };
            reader.readAsDataURL(file);
        }

        // Predict button click
        predictBtn.addEventListener('click', async () => {
            if (!selectedFile) return;

            const formData = new FormData();
            formData.append('file', selectedFile);

            predictBtn.disabled = true;
            loading.style.display = 'block';
            resultContainer.style.display = 'none';
            hideError();

            try {
                const response = await fetch('/predict', {
                    method: 'POST',
                    body: formData
                });

                const data = await response.json();

                if (data.success) {
                    resultTitle.textContent = data.prediction;
                    resultConfidence.textContent = `Confidence: ${data.confidence}`;
                    
                    resultContainer.className = 'result-container';
                    if (data.prediction.includes('Tumor Detected') && !data.prediction.includes('No')) {
                        resultContainer.classList.add('result-tumor');
                    } else {
                        resultContainer.classList.add('result-no-tumor');
                    }
                    resultContainer.style.display = 'block';
                    resetBtn.style.display = 'block';
                } else {
                    showError(data.error || 'Prediction failed');
                }
            } catch (error) {
                showError('Server error. Please try again.');
            } finally {
                loading.style.display = 'none';
                predictBtn.disabled = false;
            }
        });

        // Reset button
        resetBtn.addEventListener('click', () => {
            selectedFile = null;
            fileInput.value = '';
            previewContainer.style.display = 'none';
            uploadArea.style.display = 'block';
            resultContainer.style.display = 'none';
            resetBtn.style.display = 'none';
            predictBtn.disabled = true;
            hideError();
        });

        function showError(message) {
            errorMessage.textContent = message;
            errorMessage.style.display = 'block';
        }

        function hideError() {
            errorMessage.style.display = 'none';
        }
    </script>
</body>
</html>