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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">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/atom-one-dark.min.css" rel="stylesheet">
    <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: #2c323c; /* Background for code blocks generated by marked+hljs */
            --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;
            text-align: center;
        }

        h1 {
            color: var(--primary-color);
            margin-top: 0;
        }

        .feature-list {
            list-style-type: none;
            padding: 0;
            margin: 30px 0;
            text-align: left;
        }
        .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; }

        .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; }
        .cta-button:hover { background-color: var(--secondary-color); transform: translateY(-2px); box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15); }

        .upgrade-section { margin-top: 30px; padding: 20px; border-top: 1px solid #ddd; }
        footer { text-align: center; padding: 20px 0; color: #666; font-size: 0.9rem; }

        /* --- Styles for Solution Area --- */
        #solutionOutput {
            margin-top: 30px;
            text-align: left;
            display: none;
        }

        #solutionContainer {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            text-align: left;
            line-height: 1.8;
            font-size: 16px;
            box-shadow: var(--box-shadow);
            overflow-x: hidden; /* Prevent container scroll, let content scroll if needed */
            max-height: 70vh; /* Limit height and enable scrolling */
            overflow-y: auto; /* Enable vertical scroll */
            scroll-behavior: smooth;
        }

         /* Styles for elements generated by Marked.js */
        #solutionContainer p { margin-bottom: 1em; }
        #solutionContainer ul, #solutionContainer ol { margin-left: 2em; margin-bottom: 1em; }
        #solutionContainer li { margin-bottom: 0.5em; }
        #solutionContainer h1, #solutionContainer h2, #solutionContainer h3 { margin-top: 1.5em; margin-bottom: 0.8em; font-weight: bold; color: var(--primary-color); }
        #solutionContainer h1 { font-size: 1.8em; }
        #solutionContainer h2 { font-size: 1.5em; }
        #solutionContainer h3 { font-size: 1.2em; }
        #solutionContainer strong, #solutionContainer b { font-weight: bold; }
        #solutionContainer em, #solutionContainer i { font-style: italic; }
        #solutionContainer table { border-collapse: collapse; width: 100%; margin-bottom: 1rem; }
        #solutionContainer th, #solutionContainer td { border: 1px solid #d1d5db; padding: 0.5rem; text-align: left; }
        #solutionContainer th { background-color: #f3f4f6; font-weight: 600; }
        #solutionContainer blockquote { border-left: 4px solid #ccc; margin-left: 0; padding-left: 1em; color: #666; }

        /* Styles for Code Blocks (generated by Marked + Highlight.js) */
        #solutionContainer pre {
            margin: 1.5em 0;
            border-radius: 8px;
            overflow: hidden; /* Contains the code block */
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        #solutionContainer pre code.hljs {
            display: block;
            padding: 15px;
            background-color: var(--code-bg); /* Use defined code background */
            color: #e6e6e6; /* Default text color for atom-one-dark */
            overflow-x: auto; /* Enable horizontal scroll for long code lines */
            font-family: 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.5;
            border-radius: 0 0 8px 8px; /* Bottom radius */
        }
        /* Optional: Add a language header like in the previous code */
        /* This would require modifying how marked generates the HTML or adding JS */


        /* Styles for Loading Indicators */
        .thinking-indicator, .executing-indicator, .answering-indicator { display: flex; align-items: center; padding: 10px; margin: 10px 0; border-radius: 8px; font-size: 0.9rem; }
        .thinking-indicator { background-color: #e3f2fd; color: #1565c0; }
        .executing-indicator { background-color: #ede7f6; color: #5e35b1; }
        .answering-indicator { background-color: #e8f5e9; color: #2e7d32; }
        .indicator-icon { margin-right: 10px; animation: pulse 1.5s infinite ease-in-out; }
        @keyframes pulse { 0% { opacity: 0.6; } 50% { opacity: 1; } 100% { opacity: 0.6; } }

        /* --- MathJax Specific Styles (from previous attempts, seem okay) --- */
        mjx-container {
            overflow-x: auto !important; /* Ensure horizontal scroll for wide math */
            overflow-y: hidden;
            display: block; /* Block math */
            margin: 1em 0; /* Vertical spacing for block math */
            text-align: initial;
            padding: 2px 0 !important; /* Adjust padding */
             min-width: 0 !important; /* Prevent excessive width */
             max-width: 100% !important; /* Ensure it doesn't overflow container */
        }
        /* Inline math container */
        mjx-container[display="inline"] {
            display: inline-block !important; /* Inline math behaves like text */
            margin: 0 !important; /* No vertical margin for inline math */
             overflow-x: visible !important; /* Allow inline math to flow naturally */
        }
        mjx-assistive-mml { display: none !important; }
        .MathJax nobr,.MathJax .mjx-chtml{ display: inline-block !important; white-space: normal !important; }
        span.MathJax_Preview { display: none !important; }

    </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>Vous utilisez actuellement la version gratuite de Math Solver qui vous permet de résoudre 3 problèmes par jour.</p>

            <!-- Feature list, Upload section remain the same -->
             <div class="feature-list">
                 <h2>Fonctionnalités disponibles :</h2>
                 <ul class="feature-list">
                     <li><i class="fas fa-check-circle"></i> Résolution de problèmes mathématiques basiques</li>
                     <li><i class="fas fa-check-circle"></i> 3 résolutions gratuites par jour</li>
                     <li><i class="fas fa-check-circle"></i> Explication des étapes de résolution</li>
                     <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Mode d'exécution de code avancé (version Pro)</span></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="upload-section">
                 <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" onclick="document.getElementById('imageInput').click()">
                         <i class="fas fa-upload"></i> Télécharger une image
                     </button>
                 </form>

                 <p id="uploadStatus"></p>
                 <div id="imagePreview" style="display: none; margin: 20px auto; max-width: 500px;">
                     <img id="preview" style="width: 100%; border-radius: 8px; box-shadow: var(--box-shadow);">
                 </div>

                 <button id="solveButton" class="cta-button" style="display: none; background-color: var(--secondary-color);">
                     <i class="fas fa-calculator"></i> Résoudre ce problème
                 </button>
             </div>


            <div id="solutionOutput">
                <h3>Solution :</h3>
                <div id="loadingIndicator" class="thinking-indicator" style="display: none;">
                    <i class="fas fa-brain indicator-icon"></i>
                    <span>Je réfléchis au problème...</span>
                </div>
                <!-- Single container for the entire solution -->
                <div id="solutionContainer"></div>
            </div>

            <!-- Upgrade section remains the same -->
            <div class="upgrade-section">
                 <h2>Besoin de plus de puissance ?</h2>
                 <p>Passez à la version Pro pour des fonctionnalités avancées et des résolutions illimitées.</p>
                 <a href="#" class="cta-button">Passer à la version Pro</a>
            </div>
        </div>

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

    <!-- Dependencies -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/languages/python.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/marked.min.js"></script> <!-- Use marked 4.x -->

    <!-- MathJax Configuration and Loading -->
    <script>
        window.MathJax = {
            tex: {
                inlineMath: [['$', '$'], ['\\(', '\\)']],
                displayMath: [['$$', '$$'], ['\\[', '\\]']],
                processEscapes: true,
                processEnvironments: true,
                packages: {'[+]': ['ams', 'noerrors', 'physics', 'cancel', 'color', 'mhchem', 'mathtools']}
            },
            options: {
                enableMenu: false,
                ignoreHtmlClass: 'no-mathjax', // Ignore specific classes if needed
                processHtmlClass: 'mathjax-process', // Process only specific classes if needed
                skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre'] // Skip pre for manual highlight control
            },
            loader: {
                load: ['[tex]/ams', '[tex]/noerrors', '[tex]/physics', '[tex]/cancel', '[tex]/color', '[tex]/mhchem', '[tex]/mathtools']
            },
            startup: {
                // Function to run once MathJax is ready
                ready: () => {
                    console.log('MathJax is ready');
                    window.mathJaxReady = true; // Flag for our script
                    MathJax.startup.defaultReady(); // Perform default startup actions
                }
            },
            svg: {
                fontCache: 'global'
            }
        };
    </script>
    <script id="MathJax-script" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-svg.js"></script>

    <!-- Main Application Logic -->
    <script>
        document.addEventListener('DOMContentLoaded', () => {
            // DOM Elements
            const imageInput = document.getElementById('imageInput');
            const imagePreview = document.getElementById('imagePreview');
            const previewImage = document.getElementById('preview');
            const solveButton = document.getElementById('solveButton');
            const uploadStatus = document.getElementById('uploadStatus');
            const solutionOutput = document.getElementById('solutionOutput');
            const loadingIndicator = document.getElementById('loadingIndicator');
            const solutionContainer = document.getElementById('solutionContainer');
            const imageForm = document.getElementById('imageForm');

            // State Variables
            let solutionBuffer = '';
            let currentMode = null; // To potentially handle 'thinking' vs 'answering' differently if needed
            let updateTimeout = null;

            // Configure Marked and Highlight.js
            marked.setOptions({
                highlight: function(code, lang) {
                    const language = hljs.getLanguage(lang) ? lang : 'plaintext';
                    return hljs.highlight(code, { language }).value;
                },
                langPrefix: 'hljs language-', // CSS class prefix for hljs
                gfm: true, // Enable GitHub Flavored Markdown
                breaks: true // Convert single line breaks to <br>
            });

             // Function to update the display (debounced)
            const updateDisplay = async () => {
                if (!solutionContainer) return;

                // Parse the entire buffer with Marked
                solutionContainer.innerHTML = marked.parse(solutionBuffer);

                 // Ensure MathJax is ready before typesetting
                if (window.mathJaxReady) {
                    try {
                         // Tell MathJax to process the updated container
                        await MathJax.typesetPromise([solutionContainer]);
                        console.log("MathJax typesetting complete.");
                    } catch (e) {
                        console.error('MathJax typesetting failed:', e);
                    }
                } else {
                    console.warn("MathJax not ready, typesetting skipped for this update.");
                    // Optionally, queue this update or retry later
                }

                // Highlight code blocks (already done by marked's highlight option)
                // hljs.highlightAll(); // Not needed if using marked's highlight option

                // Scroll to bottom
                solutionContainer.scrollTop = solutionContainer.scrollHeight;
                updateTimeout = null; // Clear the timeout flag
            };

            // Schedule display update (debouncing)
            const scheduleUpdate = () => {
                if (!updateTimeout) {
                    updateTimeout = setTimeout(updateDisplay, 150); // Update slightly faster
                }
            };

            // Image selection handler
            imageInput.addEventListener('change', function(event) {
                const file = event.target.files[0];
                if (file) {
                    const reader = new FileReader();
                    reader.onload = function(e) {
                        previewImage.src = e.target.result;
                        imagePreview.style.display = 'block';
                        solveButton.style.display = 'inline-block';
                        uploadStatus.textContent = `Image sélectionnée : ${file.name}`;
                    }
                    reader.readAsDataURL(file);
                }
            });

            // Solve button handler
            solveButton.addEventListener('click', function() {
                const formData = new FormData(imageForm);

                solutionOutput.style.display = 'block';
                loadingIndicator.style.display = 'flex';
                solutionContainer.innerHTML = ''; // Clear previous solution
                solutionBuffer = ''; // Reset buffer
                currentMode = null; // Reset mode

                fetch('/solved', { // Ensure this endpoint matches your backend
                    method: 'POST',
                    body: formData
                })
                .then(response => {
                    if (!response.ok) {
                        throw new Error(`HTTP error! status: ${response.status}`);
                    }
                    const reader = response.body.getReader();
                    const decoder = new TextDecoder();
                    let streamBuffer = ''; // Buffer for incoming stream chunks

                    function processStream({ done, value }) {
                        if (done) {
                            loadingIndicator.style.display = 'none';
                            // Process any remaining data in streamBuffer (optional, depends on backend)
                            if (streamBuffer && streamBuffer.startsWith('data: ')) {
                                try {
                                     const data = JSON.parse(streamBuffer.substr(6));
                                     if (data.content) {
                                         solutionBuffer += data.content; // Add final piece
                                     }
                                } catch (e) {
                                     console.error('Error parsing final chunk:', e, streamBuffer);
                                }
                            }
                             // Final forced update
                            clearTimeout(updateTimeout); // Cancel any scheduled update
                            updateDisplay(); // Render everything received
                            return;
                        }

                        streamBuffer += decoder.decode(value, { stream: true });
                        const lines = streamBuffer.split('\n\n');
                        streamBuffer = lines.pop(); // Keep incomplete chunk

                        for (const line of lines) {
                            if (line.startsWith('data: ')) {
                                try {
                                    const data = JSON.parse(line.substr(6));

                                    if (data.mode) {
                                        currentMode = data.mode; // Store current mode if backend provides it
                                        // Update loading indicator based on mode (same as before)
                                        if (data.mode === 'thinking') { loadingIndicator.className = 'thinking-indicator'; loadingIndicator.innerHTML = '<i class="fas fa-brain indicator-icon"></i><span>Je réfléchis...</span>'; }
                                        else if (data.mode === 'answering') { loadingIndicator.className = 'answering-indicator'; loadingIndicator.innerHTML = '<i class="fas fa-pencil-alt indicator-icon"></i><span>Rédaction...</span>'; }
                                        else if (data.mode === 'executing_code') { loadingIndicator.className = 'executing-indicator'; loadingIndicator.innerHTML = '<i class="fas fa-code indicator-icon"></i><span>Exécution...</span>'; }
                                        else if (data.mode === 'code_result') { loadingIndicator.className = 'executing-indicator'; loadingIndicator.innerHTML = '<i class="fas fa-terminal indicator-icon"></i><span>Résultats...</span>'; }
                                    }

                                    if (data.content) {
                                        solutionBuffer += data.content; // Append content to buffer
                                        scheduleUpdate(); // Schedule an update
                                    }

                                    if (data.error) {
                                        // Display error prominently
                                        solutionBuffer += `\n\n**Erreur:** ${data.error}\n\n`;
                                        scheduleUpdate(); // Show the error
                                        loadingIndicator.style.display = 'none';
                                    }
                                } catch (e) {
                                    console.error('Error parsing JSON from stream:', e, line);
                                    // Optionally display a parsing error message to the user
                                    solutionBuffer += `\n\n**Erreur interne:** Impossible d'interpréter une partie de la réponse.\n\n`;
                                    scheduleUpdate();
                                }
                            }
                        }
                        // Continue reading the stream
                        return reader.read().then(processStream);
                    }
                    // Start processing the stream
                    return reader.read().then(processStream);
                })
                .catch(error => {
                    console.error('Fetch error:', error);
                    solutionContainer.innerHTML = `<p style="color: red; font-weight: bold;">Erreur de connexion ou du serveur: ${error.message}</p>`;
                    loadingIndicator.style.display = 'none';
                });
            });
        });
    </script>
</body>
</html>