// Admin JavaScript for the backend management interface

// Global object to hold Quill instances
let quillInstances = {};

document.addEventListener('DOMContentLoaded', function() {
    // Initialize theme
    initTheme();

    // Setup dashboard functionality
    setupDashboardCards();

    // Setup admin forms
    setupMatiereForm();
    setupSousCategorieForm();
    setupTexteForm(); // Basic setup (e.g., category dropdowns if needed)

    // Setup content block editor specifically for edit_texte.html
    if (document.getElementById('blocks-container')) {
        setupContentBlockEditor();
    }

    // Setup image management (gallery interaction, maybe general upload elsewhere)
    setupImageGallery(); // Handles selecting from the modal
    // Note: The specific AJAX upload logic is now mainly in edit_texte.html's script block
    // but we keep setupImageUploader for potential preview logic or other upload forms.
    setupImageUploader(); // Sets up preview for the upload form

    // Setup theme toggle
    setupThemeToggle();
});

// Initialize theme based on user preference
function initTheme() {
    const userPreference = localStorage.getItem('theme') || 'light';
    document.documentElement.setAttribute('data-theme', userPreference);
    updateThemeIcon(userPreference);
}

// Setup theme toggle functionality
function setupThemeToggle() {
    const themeToggle = document.getElementById('theme-toggle');
    if (!themeToggle) return;

    themeToggle.addEventListener('click', function() {
        const currentTheme = document.documentElement.getAttribute('data-theme');
        const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
        document.documentElement.setAttribute('data-theme', newTheme);
        localStorage.setItem('theme', newTheme);
        updateThemeIcon(newTheme);
        saveThemePreference(newTheme); // Optional: Inform server
    });
}

// Update the theme toggle icon based on current theme
function updateThemeIcon(theme) {
    const themeToggle = document.getElementById('theme-toggle');
    if (!themeToggle) return;
    const icon = themeToggle.querySelector('i');
    if (!icon) return;

    if (theme === 'dark') {
        icon.classList.remove('fa-moon');
        icon.classList.add('fa-sun');
        themeToggle.setAttribute('title', 'Activer le mode clair');
    } else {
        icon.classList.remove('fa-sun');
        icon.classList.add('fa-moon');
        themeToggle.setAttribute('title', 'Activer le mode sombre');
    }
}

// Save theme preference to server (Optional)
function saveThemePreference(theme) {
    // Example using fetch API - adjust URL and method as needed
    /*
    fetch('/set_theme_preference', { // Replace with your actual endpoint
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            // Add CSRF token header if needed
            // 'X-CSRFToken': getCsrfToken()
        },
        body: JSON.stringify({ theme: theme })
    })
    .then(response => response.json())
    .then(data => {
        if(data.success) console.log('Theme preference saved on server.');
        else console.error('Failed to save theme preference on server.');
    })
    .catch(error => {
        console.error('Error saving theme preference:', error);
    });
    */
}

// Setup dashboard cards with hover effects
function setupDashboardCards() {
    const dashboardCards = document.querySelectorAll('.admin-card');
    dashboardCards.forEach(card => {
        card.addEventListener('mouseenter', function() {
            this.style.transform = 'translateY(-5px)';
            this.style.boxShadow = 'var(--hover-shadow)';
            // Keep transition consistent (defined in CSS is better)
        });
        card.addEventListener('mouseleave', function() {
            this.style.transform = 'translateY(0)';
            this.style.boxShadow = 'var(--shadow)';
        });
    });
}

// Setup matiere form functionality (if on matiere page)
function setupMatiereForm() {
    const editButtons = document.querySelectorAll('.edit-matiere-btn');
    editButtons.forEach(button => {
        button.addEventListener('click', function() {
            const matiereId = this.getAttribute('data-id');
            const matiereName = this.getAttribute('data-name');
            const matiereColor = this.getAttribute('data-color');

            const editForm = document.getElementById('edit-matiere-form');
            const addSection = document.getElementById('add-matiere-section');
            const editSection = document.getElementById('edit-matiere-section');

            if (editForm && addSection && editSection) {
                editForm.querySelector('input[name="matiere_id"]').value = matiereId;
                editForm.querySelector('input[name="nom"]').value = matiereName;
                const colorInput = editForm.querySelector('input[name="color_code"]');
                colorInput.value = matiereColor;
                 // Trigger input event to update preview if color picker exists
                 if(colorInput) colorInput.dispatchEvent(new Event('input'));


                addSection.classList.add('d-none');
                editSection.classList.remove('d-none');
                editSection.scrollIntoView({ behavior: 'smooth' });
            }
        });
    });

    const cancelEditButton = document.getElementById('cancel-edit-matiere');
    if (cancelEditButton) {
        cancelEditButton.addEventListener('click', function(e) {
            e.preventDefault();
            document.getElementById('add-matiere-section')?.classList.remove('d-none');
            document.getElementById('edit-matiere-section')?.classList.add('d-none');
        });
    }

    // Color picker preview logic
    const colorPickers = document.querySelectorAll('input[type="color"]');
    colorPickers.forEach(picker => {
        const previewId = picker.id + '-preview'; // Assuming a convention like id="color" and preview span id="color-preview"
        let preview = document.getElementById(previewId);
        if (!preview) { // Create preview dynamically if not present
             preview = document.createElement('span');
             preview.className = 'color-preview';
             preview.id = previewId;
             preview.style.display = 'inline-block';
             preview.style.width = '24px';
             preview.style.height = '24px';
             preview.style.borderRadius = '4px';
             preview.style.marginLeft = '10px';
             preview.style.verticalAlign = 'middle';
             preview.style.border = '1px solid var(--border-color)';
             picker.parentNode.insertBefore(preview, picker.nextSibling);
        }

        picker.addEventListener('input', function() {
            preview.style.backgroundColor = this.value;
        });
        // Initialize preview color
        preview.style.backgroundColor = picker.value;
    });
}

// Setup sous categorie form functionality (if on sous_categorie page)
function setupSousCategorieForm() {
    const editButtons = document.querySelectorAll('.edit-sous-categorie-btn');
    editButtons.forEach(button => {
        button.addEventListener('click', function() {
            const sousCategorieId = this.getAttribute('data-id');
            const sousCategorieName = this.getAttribute('data-name');
            const matiereId = this.getAttribute('data-matiere-id');

            const editForm = document.getElementById('edit-sous-categorie-form');
             const addSection = document.getElementById('add-sous-categorie-section');
            const editSection = document.getElementById('edit-sous-categorie-section');

            if (editForm && addSection && editSection) {
                editForm.querySelector('input[name="sous_categorie_id"]').value = sousCategorieId;
                editForm.querySelector('input[name="nom"]').value = sousCategorieName;
                editForm.querySelector('select[name="matiere_id"]').value = matiereId;

                addSection.classList.add('d-none');
                editSection.classList.remove('d-none');
                editSection.scrollIntoView({ behavior: 'smooth' });
            }
        });
    });

    const cancelEditButton = document.getElementById('cancel-edit-sous-categorie');
    if (cancelEditButton) {
        cancelEditButton.addEventListener('click', function(e) {
            e.preventDefault();
            document.getElementById('add-sous-categorie-section')?.classList.remove('d-none');
            document.getElementById('edit-sous-categorie-section')?.classList.add('d-none');
        });
    }

    // Filter logic if present
    const matiereFilterSelect = document.getElementById('matiere-filter');
    if (matiereFilterSelect) {
        matiereFilterSelect.addEventListener('change', function() {
            const selectedMatiereId = this.value;
            const tableBody = document.querySelector('.table tbody'); // Adjust selector if needed
            if (!tableBody) return;
            const sousCategorieRows = tableBody.querySelectorAll('tr'); // Assuming each row represents a sous-categorie

            sousCategorieRows.forEach(row => {
                // Check if the row has a data attribute identifying the matiere
                 const rowMatiereId = row.getAttribute('data-matiere-id');
                 if (rowMatiereId) {
                     if (selectedMatiereId === '' || rowMatiereId === selectedMatiereId) {
                         row.style.display = ''; // Show row
                     } else {
                         row.style.display = 'none'; // Hide row
                     }
                 }
            });
        });
         // Trigger change on load to apply initial filter if a value is pre-selected
         matiereFilterSelect.dispatchEvent(new Event('change'));
    }
}

// Setup general texte form functionality (e.g., dynamic dropdowns if creating new text)
function setupTexteForm() {
    // Example: If there's a matiere dropdown that populates sous-categories on a *creation* page
    const matiereSelect = document.getElementById('matiere-select'); // Adjust ID if different
    const sousCategorieSelect = document.getElementById('sous-categorie-select'); // Adjust ID

    if (matiereSelect && sousCategorieSelect) {
        matiereSelect.addEventListener('change', function() {
            const matiereId = this.value;
            // Clear current sous-categorie options (except the default placeholder)
            sousCategorieSelect.innerHTML = '<option value="">Sélectionnez une sous-catégorie</option>';
            sousCategorieSelect.disabled = true;

            if (matiereId) {
                // Fetch sous-categories for the selected matiere
                fetch(`/api/get_sous_categories/${matiereId}`) // Adjust API endpoint
                    .then(response => {
                        if (!response.ok) {
                            throw new Error('Network response was not ok');
                        }
                        return response.json();
                    })
                    .then(data => {
                         if (data && data.length > 0) {
                             data.forEach(sc => {
                                 const option = document.createElement('option');
                                 option.value = sc.id;
                                 option.textContent = sc.nom;
                                 sousCategorieSelect.appendChild(option);
                             });
                             sousCategorieSelect.disabled = false;
                         } else {
                             // Handle case with no sous-categories
                             const option = document.createElement('option');
                             option.textContent = 'Aucune sous-catégorie trouvée';
                             option.disabled = true;
                             sousCategorieSelect.appendChild(option);
                         }
                    })
                    .catch(error => {
                        console.error('Error loading sous-categories:', error);
                        // Optionally display an error message to the user
                         const option = document.createElement('option');
                         option.textContent = 'Erreur de chargement';
                         option.disabled = true;
                         sousCategorieSelect.appendChild(option);
                    });
            }
        });
        // Trigger change on load if a matiere is pre-selected
        if(matiereSelect.value) {
           matiereSelect.dispatchEvent(new Event('change'));
        }
    }
}

// --- Content Block Editor Specific Functions ---

function setupContentBlockEditor() {
    const blocksContainer = document.getElementById('blocks-container');
    const addBlockButton = document.getElementById('add-block-button');
    const saveBlocksButton = document.getElementById('save-blocks-button');

    if (!blocksContainer) return; // Only run if the container exists

    // Initialize SortableJS for drag-and-drop
    if (window.Sortable) {
        new Sortable(blocksContainer, {
            animation: 150,
            handle: '.block-handle', // Class for the drag handle element
            ghostClass: 'block-ghost', // Class applied to the ghost element
            onEnd: function(evt) {
                updateBlockOrder(); // Renumber blocks after drag
            }
        });
    } else {
        console.warn('SortableJS not loaded. Drag and drop for blocks disabled.');
    }

    // Add new block button listener
    if (addBlockButton) {
        addBlockButton.addEventListener('click', function() {
            addContentBlock(); // Add an empty block
        });
    }

    // Save blocks button listener
    if (saveBlocksButton) {
        saveBlocksButton.addEventListener('click', function() {
            saveContentBlocks(); // Gather data and submit the form
        });
    }

    // Setup controls and Quill for existing blocks on page load
    setupExistingBlockControls();
}

// Initialize Quill Editor on a given container
function initializeQuillEditor(container, hiddenInput, initialContent = '') {
    if (!container || !hiddenInput) {
        console.error("Quill initialization failed: Container or hidden input missing.");
        return;
    }

    const blockId = container.id.replace('quill-editor-', '');

    // Prevent re-initialization
    if (quillInstances[blockId]) {
        console.warn(`Quill instance for block ${blockId} already exists.`);
        return quillInstances[blockId]; // Return existing instance
    }

    try {
        const quill = new Quill(container, {
            theme: 'snow', // Use the 'snow' theme (matches the CSS)
            modules: {
                toolbar: [
                    [{ 'header': [1, 2, 3, 4, false] }],
                    ['bold', 'italic', 'underline', 'strike'],        // toggled buttons
                    [{ 'color': [] }, { 'background': [] }],          // dropdown with defaults from theme
                    [{ 'list': 'ordered'}, { 'list': 'bullet' }],
                    [{ 'script': 'sub'}, { 'script': 'super' }],      // superscript/subscript
                    [{ 'indent': '-1'}, { 'indent': '+1' }],          // outdent/indent
                    [{ 'direction': 'rtl' }],                         // text direction
                    [{ 'align': [] }],
                    ['link'], // Add link button // Removed 'image' and 'video' as they are handled per block
                    ['blockquote', 'code-block'],
                    ['clean']                                         // remove formatting button
                ]
            },
            placeholder: 'Saisissez le contenu du bloc ici...',
        });

        // Set initial content if provided. Use dangerouslyPasteHTML for raw HTML.
        if (initialContent && initialContent.trim() !== '<p><br></p>') { // Avoid pasting empty paragraph
            quill.clipboard.dangerouslyPasteHTML(0, initialContent);
        }

        // Update hidden input whenever text changes
        quill.on('text-change', (delta, oldDelta, source) => {
            // Get HTML content from Quill. Handles empty case too.
            let htmlContent = quill.root.innerHTML;
            // Quill often leaves an empty paragraph tag (<p><br></p>) when cleared. Treat it as empty.
            if (htmlContent === '<p><br></p>') {
                htmlContent = '';
            }
            hiddenInput.value = htmlContent;
        });

        quillInstances[blockId] = quill; // Store the instance
        console.log(`Quill initialized for block ${blockId}`);
        return quill;

    } catch (error) {
        console.error(`Error initializing Quill for block ${blockId}:`, error);
        container.innerHTML = `<div class="alert alert-danger">Erreur d'initialisation de l'éditeur pour ce bloc. Contenu brut :</div><textarea class="form-control" rows="3" disabled>${initialContent}</textarea>`;
        // Still update the hidden input with the original content for safety
        hiddenInput.value = initialContent;
        return null;
    }
}


// Setup controls for existing blocks on page load
function setupExistingBlockControls() {
    const blockEditors = document.querySelectorAll('#blocks-container .block-editor');

    blockEditors.forEach((blockEditor, index) => {
        const blockId = blockEditor.getAttribute('data-block-id');
        if (!blockId) {
            console.error("Block editor found without data-block-id attribute.", blockEditor);
            return; // Skip this block
        }

        // Initialize Quill for this block
        const editorContainer = blockEditor.querySelector(`#quill-editor-${blockId}`);
        const hiddenInput = blockEditor.querySelector(`#block-${blockId}-content`);
        if (editorContainer && hiddenInput) {
            initializeQuillEditor(editorContainer, hiddenInput, hiddenInput.value); // Pass initial content from hidden input
        } else {
             console.error(`Could not find editor container or hidden input for block ${blockId}`);
        }

        // Setup Delete Button
        const deleteButton = blockEditor.querySelector('.delete-block-btn');
        if (deleteButton) {
            deleteButton.addEventListener('click', function() {
                if (confirm('Êtes-vous sûr de vouloir supprimer ce bloc ? Cette action est irréversible.')) {
                    // Clean up Quill instance before removing the element
                    if (quillInstances[blockId]) {
                        delete quillInstances[blockId]; // Remove reference
                        console.log(`Quill instance for block ${blockId} cleaned up.`);
                    }
                    blockEditor.remove();
                    updateBlockOrder(); // Renumber remaining blocks
                }
            });
        } else {
             console.warn(`Delete button not found for block ${blockId}`);
        }

        // Setup Image Selection Button
        const selectButton = blockEditor.querySelector('.select-image-btn');
        if (selectButton) {
            selectButton.addEventListener('click', function() {
                const galleryModalElement = document.getElementById('image-gallery-modal');
                if (galleryModalElement) {
                    // Store the target block ID on the modal before showing
                    galleryModalElement.setAttribute('data-target-block', blockId);
                    // Use Bootstrap's JS to show the modal
                    const galleryModal = bootstrap.Modal.getOrCreateInstance(galleryModalElement);
                    galleryModal.show();
                } else {
                    alert("Erreur : La galerie d'images n'a pas pu être trouvée.");
                }
            });
        } else {
             console.warn(`Select image button not found for block ${blockId}`);
        }

        // Setup Image Removal Button
        const removeButton = blockEditor.querySelector('.remove-image-btn');
        if (removeButton) {
            removeButton.addEventListener('click', function() {
                const imageIdInput = blockEditor.querySelector('.block-image-id');
                const imagePreview = blockEditor.querySelector('.image-preview');

                if (imageIdInput) imageIdInput.value = ''; // Clear the hidden ID
                if (imagePreview) {
                    imagePreview.src = '';
                    imagePreview.style.display = 'none'; // Hide preview
                    imagePreview.alt = 'Preview';
                }

                // Toggle button visibility
                this.style.display = 'none'; // Hide remove button
                const selectBtn = blockEditor.querySelector('.select-image-btn');
                if(selectBtn) selectBtn.style.display = 'inline-block'; // Show select button

                // Hide position controls (handled by specific function in edit_texte.html)
                const event = new CustomEvent('imageRemoved', { bubbles: true, detail: { blockEditor: blockEditor } });
                 blockEditor.dispatchEvent(event);
            });
        } else {
            console.warn(`Remove image button not found for block ${blockId}`);
        }

         // Setup Image Position Select (if needed, though primary logic might be in HTML script)
        const positionSelect = blockEditor.querySelector('.image-position-select');
         if (positionSelect) {
             positionSelect.addEventListener('change', function() {
                 // Optional: Add JS logic here if needed, e.g., apply preview classes
                 console.log(`Block ${blockId} image position changed to: ${this.value}`);
             });
         }
    });

     updateBlockOrder(); // Ensure initial numbering is correct
}


// Add a new content block to the editor
function addContentBlock(data = null) {
    const blocksContainer = document.getElementById('blocks-container');
    if (!blocksContainer) return;

    const blockCount = blocksContainer.children.length;
    const newBlockIndex = blockCount + 1;
    const blockId = 'new-block-' + Date.now(); // Unique ID for new blocks

    // Default values if data is not provided
    const initialData = {
        id: blockId, // Use the generated temporary ID
        title: data?.title || '',
        content: data?.content || '', // Default empty content for Quill
        image: data?.image || null, // { id: ..., src: ..., alt: ... }
        image_position: data?.image_position || 'left'
    };

    // Create block HTML using template literals
    const blockHtml = `
        <div class="block-editor mb-4" data-block-id="${initialData.id}">
            <div class="block-editor-header">
                <div class="d-flex align-items-center">
                    <span class="block-handle"><i class="fas fa-grip-vertical"></i></span>
                    <h3 class="block-editor-title">Bloc #${newBlockIndex}</h3>
                </div>
                <div class="block-editor-actions">
                    <button type="button" class="btn btn-danger btn-sm delete-block-btn" title="Supprimer ce bloc">
                        <i class="fas fa-trash"></i>
                    </button>
                </div>
            </div>
            <div class="form-group mb-3">
                <label for="block-${initialData.id}-title">Titre du bloc (optionnel)</label>
                <input type="text" class="form-control block-title" id="block-${initialData.id}-title" value="${initialData.title}">
            </div>
            <div class="form-group mb-3">
                <label for="quill-editor-${initialData.id}">Contenu du bloc</label>
                <!-- Quill editor container -->
                <div id="quill-editor-${initialData.id}" class="block-content-editor"></div>
                <!-- Hidden input to store Quill's HTML content -->
                <input type="hidden" class="block-content-hidden" id="block-${initialData.id}-content" value="${initialData.content}">
            </div>
            <div class="form-group">
                <label>Image (optionnel)</label>
                <div class="d-flex align-items-center mb-2">
                    <button type="button" class="btn btn-primary btn-sm select-image-btn" style="${initialData.image ? 'display:none;' : ''}">
                        <i class="fas fa-image"></i> Sélectionner une image
                    </button>
                    <button type="button" class="btn btn-warning btn-sm remove-image-btn ml-2" style="${initialData.image ? '' : 'display:none;'}">
                        <i class="fas fa-times"></i> Retirer l'image
                    </button>
                </div>
                <input type="hidden" class="block-image-id" value="${initialData.image?.id || ''}">

                <div class="block-image-container">
                    <img src="${initialData.image?.src || ''}" alt="${initialData.image?.alt || 'Prévisualisation'}" class="image-preview" style="${initialData.image ? '' : 'display:none;'}">
                </div>

                <div class="form-group mt-3 image-position-controls ${initialData.image ? '' : 'd-none'}">
                    <label for="block-${initialData.id}-image-position">Position de l'image</label>
                    <select class="form-control image-position-select" id="block-${initialData.id}-image-position">
                        <option value="left" ${initialData.image_position === 'left' ? 'selected' : ''}>Gauche</option>
                        <option value="right" ${initialData.image_position === 'right' ? 'selected' : ''}>Droite</option>
                        <option value="top" ${initialData.image_position === 'top' ? 'selected' : ''}>Haut</option>
                    </select>
                </div>
            </div>
        </div>
    `;

    // Add the block HTML to the container
    blocksContainer.insertAdjacentHTML('beforeend', blockHtml);

    // Get the newly added block element
    const newBlockElement = blocksContainer.lastElementChild;

    // Initialize Quill for the new block
    const editorContainer = newBlockElement.querySelector(`#quill-editor-${initialData.id}`);
    const hiddenInput = newBlockElement.querySelector(`#block-${initialData.id}-content`);
    if(editorContainer && hiddenInput) {
       initializeQuillEditor(editorContainer, hiddenInput, initialData.content);
    } else {
         console.error(`Failed to find editor elements for new block ${initialData.id}`);
    }


    // Add event listeners for the new block's controls (delete, select image, remove image)
    // Delegate event listeners might be more efficient, but direct binding is simpler here

    // Delete button
    const deleteButton = newBlockElement.querySelector('.delete-block-btn');
    if (deleteButton) {
        deleteButton.addEventListener('click', function() {
             if (confirm('Êtes-vous sûr de vouloir supprimer ce bloc ?')) {
                 // Clean up Quill instance
                 if (quillInstances[initialData.id]) {
                     delete quillInstances[initialData.id];
                     console.log(`Quill instance for block ${initialData.id} cleaned up.`);
                 }
                 newBlockElement.remove();
                 updateBlockOrder();
             }
        });
    }

    // Select image button
    const selectButton = newBlockElement.querySelector('.select-image-btn');
    if (selectButton) {
        selectButton.addEventListener('click', function() {
             const galleryModalElement = document.getElementById('image-gallery-modal');
             if (galleryModalElement) {
                 galleryModalElement.setAttribute('data-target-block', initialData.id);
                 const galleryModal = bootstrap.Modal.getOrCreateInstance(galleryModalElement);
                 galleryModal.show();
             } else {
                  alert("Erreur : La galerie d'images n'a pas pu être trouvée.");
             }
        });
    }

    // Remove image button
    const removeButton = newBlockElement.querySelector('.remove-image-btn');
     if (removeButton) {
         removeButton.addEventListener('click', function() {
             const imageIdInput = newBlockElement.querySelector('.block-image-id');
             const imagePreview = newBlockElement.querySelector('.image-preview');

             if (imageIdInput) imageIdInput.value = '';
             if (imagePreview) {
                 imagePreview.src = '';
                 imagePreview.style.display = 'none';
                 imagePreview.alt = 'Preview';
             }

             this.style.display = 'none'; // Hide remove button
             const selectBtn = newBlockElement.querySelector('.select-image-btn');
             if (selectBtn) selectBtn.style.display = 'inline-block'; // Show select button

             // Hide position controls
              const event = new CustomEvent('imageRemoved', { bubbles: true, detail: { blockEditor: newBlockElement } });
              newBlockElement.dispatchEvent(event);
         });
     }


    // Scroll to the new block
    newBlockElement.scrollIntoView({ behavior: 'smooth', block: 'center' });
}


// Update block order numbers in the UI titles
function updateBlockOrder() {
    const blocks = document.querySelectorAll('#blocks-container .block-editor');
    blocks.forEach((block, index) => {
        const titleEl = block.querySelector('.block-editor-title');
        if (titleEl) {
            titleEl.textContent = `Bloc #${index + 1}`;
        }
    });
    console.log("Block order updated.");
}

// Save content blocks by gathering data and submitting the form
function saveContentBlocks() {
    const blocksContainer = document.getElementById('blocks-container');
    const blocksDataInput = document.getElementById('blocks-data');
    const blocksForm = document.getElementById('blocks-form');

    if (!blocksContainer || !blocksDataInput || !blocksForm) {
         console.error("Cannot save blocks: Missing container, data input, or form element.");
         alert("Erreur : Impossible de sauvegarder les blocs. Éléments de formulaire manquants.");
         return;
    }

    const blockElements = blocksContainer.querySelectorAll('.block-editor');
    const blocksData = [];

    console.log(`Gathering data for ${blockElements.length} blocks...`);

    blockElements.forEach((blockElement, index) => {
        const blockId = blockElement.getAttribute('data-block-id');
        const titleInput = blockElement.querySelector('.block-title');
        const hiddenContentInput = blockElement.querySelector('.block-content-hidden');
        const imageIdInput = blockElement.querySelector('.block-image-id');
        const imagePositionSelect = blockElement.querySelector('.image-position-select');

        let content = '';
        // Crucially, get the latest content from Quill instance if available
        if (quillInstances[blockId]) {
            content = quillInstances[blockId].root.innerHTML;
             // Treat empty Quill editor as empty string
             if (content === '<p><br></p>') {
                content = '';
             }
             // Ensure hidden input is also synced before submission (belt and suspenders)
             if (hiddenContentInput) hiddenContentInput.value = content;
        } else if (hiddenContentInput) {
            // Fallback to hidden input if Quill instance is missing (error condition)
            content = hiddenContentInput.value;
             console.warn(`Quill instance missing for block ${blockId}. Using hidden input value.`);
        } else {
             console.error(`Cannot get content for block ${blockId}: No Quill instance and no hidden input.`);
        }

        const blockDataItem = {
            // Include the original block ID if it's not a new one,
            // otherwise, the backend should know how to handle blocks without a numeric ID
            id: blockId.startsWith('new-block-') ? null : blockId,
            temp_id: blockId.startsWith('new-block-') ? blockId : null, // Send temp ID for new blocks if needed
            title: titleInput ? titleInput.value.trim() : '',
            content: content,
            image_id: imageIdInput ? (imageIdInput.value || null) : null, // Send null if empty
            image_position: imagePositionSelect ? imagePositionSelect.value : 'left',
            order: index // Set the order based on current position
        };
        blocksData.push(blockDataItem);
    });

    // Set the JSON data in the hidden input field
    blocksDataInput.value = JSON.stringify(blocksData);

    console.log("Blocks data prepared:", blocksDataInput.value);

    // Submit the form
    // Add loading indicator?
    const saveButton = document.getElementById('save-blocks-button');
    if(saveButton) {
       saveButton.disabled = true;
       saveButton.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Sauvegarde...';
    }

    blocksForm.submit();
}

// --- Image Management Functions ---

// Setup image uploader preview (for the form in edit_texte.html)
function setupImageUploader() {
    const imageFileInput = document.getElementById('image-file'); // ID from edit_texte.html form
    const imagePreview = document.getElementById('upload-image-preview'); // ID from edit_texte.html form

    if (imageFileInput && imagePreview) {
        imageFileInput.addEventListener('change', function() {
            if (this.files && this.files[0]) {
                const reader = new FileReader();
                reader.onload = function(e) {
                    imagePreview.src = e.target.result;
                    imagePreview.style.display = 'block'; // Show preview
                };
                reader.readAsDataURL(this.files[0]);
            } else {
                 // Clear preview if no file selected
                 imagePreview.src = '#';
                 imagePreview.style.display = 'none';
            }
        });
    }
}

// Setup image gallery modal interaction
function setupImageGallery() {
    const galleryModalElement = document.getElementById('image-gallery-modal');
    if (!galleryModalElement) return;

    const galleryContent = galleryModalElement.querySelector('#image-gallery-content'); // Container for images

    // Use event delegation on the modal body for image clicks
    galleryModalElement.addEventListener('click', function(event) {
        const galleryItem = event.target.closest('.gallery-item');
        if (!galleryItem) return; // Clicked outside an item

        const imageId = galleryItem.getAttribute('data-image-id');
        const imageElement = galleryItem.querySelector('img');
        const imageSrc = imageElement ? imageElement.src : '';
        const imageAlt = imageElement ? imageElement.alt : '';

        // Get the ID of the block that opened the modal
        const targetBlockId = galleryModalElement.getAttribute('data-target-block');

        if (!targetBlockId) {
            console.error("Target block ID not found on modal.");
            return;
        }

        // Find the target block editor element
        const blockEditor = document.querySelector(`.block-editor[data-block-id="${targetBlockId}"]`);

        if (blockEditor && imageId && imageSrc) {
            // Update the block's image ID input
            const imageIdInput = blockEditor.querySelector('.block-image-id');
            if (imageIdInput) imageIdInput.value = imageId;

            // Update the block's image preview
            const imagePreview = blockEditor.querySelector('.image-preview');
            if (imagePreview) {
                imagePreview.src = imageSrc;
                imagePreview.alt = imageAlt || 'Prévisualisation';
                imagePreview.style.display = 'block'; // Ensure preview is visible
            }

            // Toggle visibility of select/remove buttons
            const selectButton = blockEditor.querySelector('.select-image-btn');
            const removeButton = blockEditor.querySelector('.remove-image-btn');
            if (selectButton) selectButton.style.display = 'none';
            if (removeButton) removeButton.style.display = 'inline-block';

            // Show position controls (handled by specific function in edit_texte.html)
             const customEvent = new CustomEvent('imageSelected', { bubbles: true, detail: { blockEditor: blockEditor } });
             blockEditor.dispatchEvent(customEvent);


            // Close the modal
            const galleryModalInstance = bootstrap.Modal.getInstance(galleryModalElement);
            if (galleryModalInstance) {
                galleryModalInstance.hide();
            }
        } else {
             console.error(`Failed to update block ${targetBlockId}. Block editor or image data missing.`);
        }
    });

    // Optional: Add logic here to dynamically load gallery images via AJAX if needed
    // E.g., on modal 'show.bs.modal' event
}