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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Math Solver - Version Gratuite</title>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css" rel="stylesheet">
    <!-- Use a CDN that hosts the specific atom-one-dark theme -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">
    <style>
        :root {
            --primary-color: #4a6fa5;
            --secondary-color: #166088;
            --accent-color: #4fc3f7;
            --background-color: #f8f9fa;
            --text-color: #333;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --code-bg: #282c34; /* atom-one-dark background */
            --code-text: #abb2bf; /* atom-one-dark default text */
            --output-bg: #f1f8f9;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background-color: var(--background-color);
            color: var(--text-color);
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            text-align: center;
            padding: 20px 0;
            margin-bottom: 30px;
        }

        .logo {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .subtitle {
            font-size: 1.2rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }

        .content-box {
            background-color: white;
            border-radius: 10px;
            box-shadow: var(--box-shadow);
            padding: 30px;
            margin-bottom: 30px;
            /* Removed text-align: center; allowing content to align left */
        }

        h1, h2, h3 {
            color: var(--primary-color);
            margin-top: 0;
            text-align: center; /* Center headings specifically */
        }
         h2 {
            margin-top: 1.5em; /* Add space above h2 */
         }

        .feature-list {
            list-style-type: none;
            padding: 0;
            margin: 30px auto; /* Center list container */
            text-align: left;
            max-width: 500px; /* Constrain width for better readability */
        }

        .feature-list li {
            padding: 10px 0;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }

        .feature-list i {
            color: var(--accent-color);
            margin-right: 10px;
            font-size: 1.2rem;
            width: 20px; /* Ensure consistent icon alignment */
            text-align: center;
        }
        .feature-list i.fa-times-circle {
             color: #aaa; /* Muted color for disabled features */
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 12px 25px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
            margin: 20px 10px;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .cta-button:disabled {
            background-color: #ccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .upgrade-section {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #ddd;
            text-align: center;
        }

        footer {
            text-align: center;
            padding: 20px 0;
            color: #666;
            font-size: 0.9rem;
        }

        #solutionOutput {
            margin-top: 30px;
            text-align: left; /* Ensure solution text aligns left */
        }

        #solution {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            border: 1px solid #eee; /* Add a subtle border */
            margin-top: 15px;
            line-height: 1.8;
            font-size: 16px;
            overflow-wrap: break-word; /* Wrap long lines */
            white-space: pre-wrap; /* Preserve whitespace and newlines from response */
        }

        /* Styling for Markdown code blocks generated by Python */
        #solution pre {
            background-color: var(--code-bg);
            color: var(--code-text);
            padding: 15px;
            border-radius: 5px;
            overflow-x: auto;
            margin: 15px 0; /* Add spacing around code blocks */
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
        }

        #solution pre code {
            font-family: 'Courier New', Courier, monospace;
            font-size: 14px;
            line-height: 1.5;
            white-space: pre; /* Ensure pre formatting is respected within code tag */
            background: none; /* Remove double background */
            padding: 0; /* Remove double padding */
        }

        /* Styling for the execution result block (if Python wraps it) */
        #solution .output-section { /* Use if Python wraps result in <div class="output-section"> */
             background-color: var(--output-bg);
             padding: 15px;
             border-radius: 5px;
             border: 1px solid #ddd;
             color: #333;
             font-family: 'Courier New', monospace;
             font-size: 14px;
             white-space: pre-wrap;
             overflow-x: auto;
             margin: 15px 0;
        }
         /* Styling for result block if using Markdown ``` only */
         #solution pre code:not(.language-python) {
             /* Style non-Python code blocks (likely execution results) differently */
             background-color: var(--output-bg);
             color: #333;
             display: block; /* Make it block level for padding */
             padding: 10px;
             border-radius: 4px;
             border: 1px solid #eee;
         }
         /* Identify result block by preceding text */
         #solution strong:contains("Résultat d'exécution:") + pre {
             /* Style the <pre> immediately following the specific strong tag */
             border: 1px dashed #ccc;
             background-color: #fdfdfd;
         }
         #solution strong:contains("Résultat d'exécution:") + pre code {
             /* Style the <code> inside that specific <pre> */
             background-color: transparent; /* No extra background */
             color: #222;
         }


        /* Removed step-section styling as structure is now simpler */

        /* Removed indicator styles (thinking, executing etc.) */
        .loading-indicator {
            display: flex;
            align-items: center;
            justify-content: center; /* Center content */
            padding: 15px;
            margin: 20px 0;
            border-radius: 8px;
            font-size: 1rem;
            background-color: #e3f2fd;
            color: #1565c0;
            border: 1px solid #bbdefb;
        }
        .loading-indicator i {
             margin-right: 10px;
             animation: spin 1.5s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }


        /* MathJax specific styles for better overflow handling */
        .MathJax, mjx-container {
            overflow-x: auto !important;
            overflow-y: hidden !important;
            max-width: 100% !important;
            min-width: 0 !important; /* Prevent minimum width issues */
            padding: 5px 0; /* Add a bit of vertical padding */
            display: block !important; /* Ensure it behaves like a block */
            text-align: left !important; /* Align LaTeX left by default */
        }
        mjx-container[display="true"] {
             display: block !important;
             margin: 1em 0 !important; /* Spacing for display math */
             text-align: center !important; /* Center display math */
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }
            .content-box {
                padding: 20px;
            }
            #solution pre {
                padding: 10px;
            }
            #solution pre code {
                font-size: 13px;
            }
        }
        .upload-section {
             text-align: center; /* Center upload elements */
        }
        #imagePreview {
             display: none;
             margin: 20px auto;
             max-width: 90%; /* Responsive max width */
             max-height: 400px; /* Limit preview height */
        }
        #preview {
             max-width: 100%;
             max-height: 400px; /* Match container height */
             height: auto; /* Maintain aspect ratio */
             width: auto; /* Maintain aspect ratio */
             border-radius: 8px;
             box-shadow: var(--box-shadow);
             border: 1px solid #ddd;
        }
        #uploadStatus {
             margin-top: 15px;
             font-size: 0.9em;
             color: #555;
        }
        .error-message {
             color: red;
             background-color: #ffeeee;
             border: 1px solid red;
             padding: 10px;
             margin: 15px 0;
             border-radius: 5px;
             text-align: left;
        }
    </style>
</head>
<body>
    <div class="container">
        <header>
            <div class="logo">Math Solver</div>
            <div class="subtitle">La solution intelligente pour vos problèmes mathématiques</div>
        </header>

        <div class="content-box">
            <h1>Version Gratuite</h1>
            <p style="text-align: center;">Vous utilisez actuellement la version gratuite de Math Solver.</p> <!-- Centered paragraph -->

            <div class="upload-section">
                 <h2>Soumettez votre problème</h2>
                <form id="imageForm" enctype="multipart/form-data">
                    <input type="file" id="imageInput" name="image" accept="image/*" style="display: none;">
                    <button type="button" id="uploadButton" class="cta-button">
                        <i class="fas fa-upload"></i> Télécharger une image
                    </button>
                </form>
                <p id="uploadStatus"></p>
                <div id="imagePreview">
                    <img id="preview" alt="Aperçu de l'image">
                </div>
                <button id="solveButton" class="cta-button" style="display: none; background-color: var(--secondary-color);" disabled>
                    <i class="fas fa-calculator"></i> Résoudre ce problème
                </button>
            </div>

             <!-- Solution Output Area -->
            <div id="solutionOutput" style="display: none;"> <!-- Keep hidden initially -->
                 <hr style="margin: 30px 0;"> <!-- Separator -->
                <h3>Solution :</h3>
                <div id="loadingIndicator" class="loading-indicator" style="display: none;">
                     <i class="fas fa-spinner"></i> <!-- Changed to spinner -->
                    <span>Résolution en cours...</span>
                </div>
                <div id="solution"></div> <!-- Solution content will appear here -->
                <div id="errorContainer" class="error-message" style="display: none;"></div> <!-- Error messages -->
            </div>


            <div class="feature-list">
                <h2>Fonctionnalités :</h2>
                <ul> <!-- Removed ul class -->
                    <li><i class="fas fa-check-circle"></i> Résolution de problèmes mathématiques</li>
                    <li><i class="fas fa-check-circle"></i> Explication des étapes (si fournies par l'IA)</li>
                    <li><i class="fas fa-check-circle"></i> Utilisation de LaTeX pour les formules</li>
                    <li><i class="fas fa-check-circle"></i> Exécution de code Python pour calculs</li>
                    <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Résolutions illimitées (version Pro)</span></li>
                    <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Support prioritaire (version Pro)</span></li>
                </ul>
            </div>

            <div class="upgrade-section">
                <h2>Besoin de plus ?</h2>
                <p>Passez à la version Pro pour des fonctionnalités avancées et des résolutions illimitées.</p>
                <a href="/" class="cta-button">Découvrir la version Pro</a> <!-- Link to Pro version page -->
            </div>
        </div>

        <footer>
            <p>© 2025 Math Solver. Tous droits réservés.</p>
        </footer>
    </div>

    <!-- Use latest highlight.js -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
    <!-- Add languages you expect, python is essential -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/python.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/bash.min.js"></script> <!-- For shell output maybe -->

     <!-- Use Marked.js for Markdown rendering -->
     <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>

    <!-- MathJax Configuration -->
    <script>
    window.MathJax = {
      tex: {
        inlineMath: [['$', '$'], ['\\(', '\\)']],
        displayMath: [['$$', '$$'], ['\\[', '\\]']],
        processEscapes: true,
        processEnvironments: true,
        packages: {'[+]': ['ams', 'noerrors', 'physics', 'cancel', 'color', 'mhchem', 'mathtools']} // Load common packages
      },
      options: {
        enableMenu: false, // Disable right-click menu
        ignoreHtmlClass: 'tex2jax_ignore', // Class to ignore
        processHtmlClass: 'tex2jax_process', // Class to process (can add to #solution if needed)
        skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code'] // Skip these tags
      },
      startup: {
        // Function to run once MathJax is ready
        ready: () => {
          console.log('MathJax is ready');
          MathJax.startup.defaultReady();
          // You could potentially trigger an initial typeset if needed
          // MathJax.startup.promise.then(() => { MathJax.typesetPromise(); });
        }
      },
      loader: {
        load: ['[tex]/ams', '[tex]/noerrors', '[tex]/physics', '[tex]/cancel', '[tex]/color', '[tex]/mhchem', '[tex]/mathtools'] // Ensure packages are loaded
      },
      svg: {
        fontCache: 'global' // Cache fonts for better performance
      }
    };
    </script>
    <!-- Load MathJax AFTER configuration -->
    <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js"></script>

    <script>
        // DOM Elements
        const imageInput = document.getElementById('imageInput');
        const uploadButton = document.getElementById('uploadButton');
        const imageForm = document.getElementById('imageForm');
        const uploadStatus = document.getElementById('uploadStatus');
        const imagePreview = document.getElementById('imagePreview');
        const preview = document.getElementById('preview');
        const solveButton = document.getElementById('solveButton');
        const solutionOutput = document.getElementById('solutionOutput');
        const loadingIndicator = document.getElementById('loadingIndicator');
        const solutionDiv = document.getElementById('solution');
        const errorContainer = document.getElementById('errorContainer');

        // --- Event Listeners ---

        // Trigger file input when upload button is clicked
        uploadButton.addEventListener('click', () => imageInput.click());

        // Handle image selection
        imageInput.addEventListener('change', function(event) {
            const file = event.target.files[0];
            if (file) {
                // Basic client-side validation (type and size)
                if (!file.type.startsWith('image/')) {
                    uploadStatus.textContent = 'Erreur : Veuillez sélectionner un fichier image.';
                    uploadStatus.style.color = 'red';
                    imagePreview.style.display = 'none';
                    solveButton.style.display = 'none';
                    solveButton.disabled = true;
                    return;
                }
                 // Optional: Size limit (e.g., 10MB)
                const maxSize = 10 * 1024 * 1024;
                if (file.size > maxSize) {
                    uploadStatus.textContent = 'Erreur : L\'image est trop grande (max 10MB).';
                    uploadStatus.style.color = 'red';
                    imagePreview.style.display = 'none';
                    solveButton.style.display = 'none';
                    solveButton.disabled = true;
                    return;
                }


                const reader = new FileReader();
                reader.onload = function(e) {
                    preview.src = e.target.result;
                    imagePreview.style.display = 'block';
                    solveButton.style.display = 'inline-block';
                    solveButton.disabled = false; // Enable solve button
                    uploadStatus.textContent = `Image sélectionnée : ${file.name}`;
                    uploadStatus.style.color = '#555'; // Reset color
                    // Clear previous solution/error
                    solutionOutput.style.display = 'none';
                    solutionDiv.innerHTML = '';
                    errorContainer.style.display = 'none';
                    errorContainer.textContent = '';

                }
                reader.onerror = function() {
                     uploadStatus.textContent = 'Erreur : Impossible de lire le fichier image.';
                     uploadStatus.style.color = 'red';
                     imagePreview.style.display = 'none';
                     solveButton.style.display = 'none';
                     solveButton.disabled = true;
                }
                reader.readAsDataURL(file);
            } else {
                 // No file selected or selection cancelled
                 uploadStatus.textContent = '';
                 imagePreview.style.display = 'none';
                 solveButton.style.display = 'none';
                 solveButton.disabled = true;
            }
        });

        // Handle form submission (clicking the solve button)
        solveButton.addEventListener('click', function() {
            const file = imageInput.files[0];
            if (!file) {
                showError('Veuillez d\'abord sélectionner une image.');
                return;
            }

            const formData = new FormData(imageForm);

            // Reset UI for new request
            solutionOutput.style.display = 'block'; // Show the output area
            loadingIndicator.style.display = 'flex'; // Show loading spinner
            solutionDiv.innerHTML = ''; // Clear previous solution
            errorContainer.style.display = 'none'; // Hide previous error
            errorContainer.textContent = '';
            solveButton.disabled = true; // Disable button during processing
            uploadButton.disabled = true; // Disable upload during processing

            fetch('/solved', { // Ensure this matches your Flask route
                method: 'POST',
                body: formData
            })
            .then(response => {
                if (!response.ok) {
                    // Try to parse JSON error body from server
                    return response.json().then(errData => {
                         // Throw an error with the message from server JSON
                         throw new Error(errData.error || `Erreur HTTP ${response.status}`);
                    }).catch(() => {
                         // If JSON parsing fails, throw generic HTTP error
                         throw new Error(`Erreur HTTP ${response.status}: ${response.statusText}`);
                    });
                }
                return response.json(); // Parse successful response as JSON
            })
            .then(data => {
                loadingIndicator.style.display = 'none'; // Hide loading indicator

                if (data.error) {
                     // Handle errors returned in the JSON payload
                     showError(data.error);
                } else if (data.solution) {
                    // Use Marked.js to render the Markdown solution from the server
                    // This handles ```python blocks, standard markdown, etc.
                    // Ensure Marked converts ```python to <pre><code class="language-python">
                    marked.setOptions({
                         highlight: function(code, lang) {
                             const language = hljs.getLanguage(lang) ? lang : 'plaintext';
                             return hljs.highlight(code, { language, ignoreIllegals: true }).value;
                         },
                         langPrefix: 'language-', // standard prefix for hljs
                         pedantic: false,
                         gfm: true, // Enable GitHub Flavored Markdown
                         breaks: true, // Convert single newlines in paragraphs into <br>
                         smartLists: true,
                         smartypants: false, // Avoid changing quotes/dashes
                         xhtml: false
                     });

                     solutionDiv.innerHTML = marked.parse(data.solution);

                    // --- MathJax Typesetting ---
                    // Check if MathJax is loaded and ready before typesetting
                    if (window.MathJax && MathJax.startup) {
                         MathJax.startup.promise = MathJax.startup.promise.then(() => {
                            console.log("Typesetting MathJax content...");
                            // Typeset the entire solutionDiv AFTER rendering Markdown
                            return MathJax.typesetPromise([solutionDiv]);
                         }).catch((err) => {
                             console.error('MathJax typesetting failed:', err);
                             showError('Erreur lors du rendu des formules mathématiques.');
                         });
                    } else {
                         console.warn('MathJax not fully loaded or ready yet.');
                         // Optionally, try typesetting later or inform user
                         showError('MathJax n\'est pas chargé, le rendu LaTeX peut échouer.');
                    }

                    // --- Optional: Post-processing (e.g., styling result blocks) ---
                    // Example: Add specific style to result blocks identified by text
                    const resultHeaders = solutionDiv.querySelectorAll('strong');
                    resultHeaders.forEach(header => {
                         if (header.textContent.includes("Résultat d'exécution:")) {
                             const nextElement = header.nextElementSibling;
                             if (nextElement && nextElement.tagName === 'PRE') {
                                 nextElement.classList.add('execution-result-block'); // Add a class for styling
                             }
                         }
                    });


                } else {
                     showError('La réponse reçue est vide ou invalide.');
                }
            })
            .catch(error => {
                console.error('Fetch Error:', error);
                loadingIndicator.style.display = 'none';
                // Display the caught error message
                showError(`Erreur de communication : ${error.message}`);
            })
            .finally(() => {
                 // Re-enable buttons regardless of success or failure
                 solveButton.disabled = false;
                 uploadButton.disabled = false;
                 // Scroll to the solution area
                 // Use smooth scrolling if supported
                 solutionOutput.scrollIntoView({ behavior: 'smooth', block: 'start' });
            });
        });

        // Helper function to display errors
        function showError(message) {
            errorContainer.textContent = message;
            errorContainer.style.display = 'block';
            solutionDiv.innerHTML = ''; // Clear any partial solution
            loadingIndicator.style.display = 'none'; // Ensure loading is hidden
        }

        // Initialize Highlight.js (optional, if not done by Marked config)
        // hljs.highlightAll(); // Usually called after content is added
    </script>
</body>
</html>