// Main application JavaScript for the frontend

// Wait for the DOM to be loaded before executing
document.addEventListener('DOMContentLoaded', function() {
    // Initialize theme
    initTheme();
    
    // Setup interactive elements
    setupSubjectSelection();
    setupCategorySelection();
    setupTextSelection();
    setupThemeToggle();
    
    // Setup feedback form submission
    const feedbackForm = document.getElementById('feedback-form');
    if (feedbackForm) {
        feedbackForm.addEventListener('submit', function(e) {
            const feedbackMessage = document.getElementById('feedback-message');
            if (!feedbackMessage.value.trim()) {
                e.preventDefault();
                alert('Veuillez entrer un message avant d\'envoyer votre feedback.');
            }
        });
    }
});

// Initialize theme based on user preference
function initTheme() {
    const userPreference = localStorage.getItem('theme') || 'light';
    document.documentElement.setAttribute('data-theme', userPreference);
    
    // Update theme icon
    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';
        
        // Update theme attribute
        document.documentElement.setAttribute('data-theme', newTheme);
        
        // Save preference to localStorage
        localStorage.setItem('theme', newTheme);
        
        // Update icon
        updateThemeIcon(newTheme);
        
        // Send theme preference to server
        saveThemePreference(newTheme);
    });
}

// Update the theme toggle icon based on current theme
function updateThemeIcon(theme) {
    const themeToggle = document.getElementById('theme-toggle');
    if (!themeToggle) return;
    
    // Update icon based on theme
    if (theme === 'dark') {
        themeToggle.innerHTML = '<i class="fas fa-sun"></i>';
        themeToggle.setAttribute('title', 'Activer le mode clair');
    } else {
        themeToggle.innerHTML = '<i class="fas fa-moon"></i>';
        themeToggle.setAttribute('title', 'Activer le mode sombre');
    }
}

// Save theme preference to server
function saveThemePreference(theme) {
    const formData = new FormData();
    formData.append('theme', theme);
    
    fetch('/set_theme', {
        method: 'POST',
        body: formData
    })
    .then(response => response.json())
    .then(data => {
        console.log('Theme preference saved:', data);
    })
    .catch(error => {
        console.error('Error saving theme preference:', error);
    });
}

// Setup subject selection functionality
function setupSubjectSelection() {
    const subjectCards = document.querySelectorAll('.subject-card');
    const subjectSelect = document.getElementById('matiere-select');
    
    // Handle subject card clicks
    subjectCards.forEach(card => {
        card.addEventListener('click', function() {
            const matiereId = this.getAttribute('data-matiere-id');
            
            // Update select element if it exists
            if (subjectSelect) {
                subjectSelect.value = matiereId;
                // Trigger change event to load subcategories
                const event = new Event('change');
                subjectSelect.dispatchEvent(event);
            } else {
                loadSubCategories(matiereId);
            }
            
            // Highlight the selected card
            subjectCards.forEach(c => c.classList.remove('active'));
            this.classList.add('active');
            
            // Show the categories section
            const categoriesSection = document.getElementById('sous-categories-section');
            if (categoriesSection) {
                categoriesSection.classList.remove('d-none');
                categoriesSection.scrollIntoView({ behavior: 'smooth' });
            }
        });
    });
    
    // Handle subject select change
    if (subjectSelect) {
        subjectSelect.addEventListener('change', function() {
            const matiereId = this.value;
            if (matiereId) {
                loadSubCategories(matiereId);
                
                // Show the categories section
                const categoriesSection = document.getElementById('sous-categories-section');
                if (categoriesSection) {
                    categoriesSection.classList.remove('d-none');
                }
            }
        });
    }
}

// Load subcategories for the selected subject
function loadSubCategories(matiereId) {
    fetch(`/get_sous_categories/${matiereId}`)
        .then(response => response.json())
        .then(data => {
            // Update subcategories list
            const sousCategoriesList = document.getElementById('sous-categories-list');
            if (sousCategoriesList) {
                sousCategoriesList.innerHTML = '';
                
                data.forEach(category => {
                    const item = document.createElement('li');
                    item.className = 'selection-item';
                    item.setAttribute('data-category-id', category.id);
                    item.textContent = category.nom;
                    
                    // Add click event
                    item.addEventListener('click', function() {
                        const categoryId = this.getAttribute('data-category-id');
                        loadTextes(categoryId);
                        
                        // Highlight the selected category
                        const items = sousCategoriesList.querySelectorAll('.selection-item');
                        items.forEach(i => i.classList.remove('active'));
                        this.classList.add('active');
                        
                        // Show the texts section
                        const textesSection = document.getElementById('textes-section');
                        if (textesSection) {
                            textesSection.classList.remove('d-none');
                        }
                    });
                    
                    sousCategoriesList.appendChild(item);
                });
                
                // Show the subcategories section if it's hidden
                const sousCategoriesSection = document.getElementById('sous-categories-section');
                if (sousCategoriesSection) {
                    sousCategoriesSection.classList.remove('d-none');
                }
            }
        })
        .catch(error => {
            console.error('Error loading subcategories:', error);
        });
}

// Setup category selection functionality
function setupCategorySelection() {
    const categorySelect = document.getElementById('sous-categorie-select');
    
    if (categorySelect) {
        categorySelect.addEventListener('change', function() {
            const categoryId = this.value;
            if (categoryId) {
                loadTextes(categoryId);
                
                // Show the texts section
                const textesSection = document.getElementById('textes-section');
                if (textesSection) {
                    textesSection.classList.remove('d-none');
                }
            }
        });
    }
}

// Load texts for the selected category
function loadTextes(categoryId) {
    fetch(`/get_textes/${categoryId}`)
        .then(response => response.json())
        .then(data => {
            // Update texts list
            const textesList = document.getElementById('textes-list');
            if (textesList) {
                textesList.innerHTML = '';
                
                data.forEach(texte => {
                    const item = document.createElement('li');
                    item.className = 'selection-item';
                    item.setAttribute('data-texte-id', texte.id);
                    item.textContent = texte.titre;
                    
                    // Add click event
                    item.addEventListener('click', function() {
                        const texteId = this.getAttribute('data-texte-id');
                        displayTexte(texteId);
                        
                        // Highlight the selected text
                        const items = textesList.querySelectorAll('.selection-item');
                        items.forEach(i => i.classList.remove('active'));
                        this.classList.add('active');
                    });
                    
                    textesList.appendChild(item);
                });
                
                // Show the texts section
                const textesSection = document.getElementById('textes-section');
                if (textesSection) {
                    textesSection.classList.remove('d-none');
                }
                
                // Hide the content section since no text is selected yet
                const contentSection = document.getElementById('content-section');
                if (contentSection) {
                    contentSection.classList.add('d-none');
                }
            }
        })
        .catch(error => {
            console.error('Error loading texts:', error);
        });
}

// Setup text selection functionality
function setupTextSelection() {
    const texteSelect = document.getElementById('texte-select');
    
    if (texteSelect) {
        texteSelect.addEventListener('change', function() {
            const texteId = this.value;
            if (texteId) {
                displayTexte(texteId);
            }
        });
    }
}

// Display the selected texte with content blocks
function displayTexte(texteId) {
    fetch(`/get_texte/${texteId}`)
        .then(response => response.json())
        .then(data => {
            const contentSection = document.getElementById('content-section');
            const contentTitle = document.getElementById('content-title');
            const contentBlocks = document.getElementById('content-blocks');
            
            if (contentSection && contentTitle && contentBlocks) {
                // Update content title
                contentTitle.textContent = data.titre;
                
                // Update content theme color based on matiere color
                if (data.color_code) {
                    // Apply color to title underline
                    contentTitle.style.borderBottomColor = data.color_code;
                    
                    // Apply color to all block titles
                    const style = document.createElement('style');
                    style.id = 'dynamic-block-styles';
                    const existingStyle = document.getElementById('dynamic-block-styles');
                    if (existingStyle) {
                        existingStyle.remove();
                    }
                    
                    style.textContent = `
                        .content-block-title {
                            border-bottom-color: ${data.color_code} !important;
                        }
                        .content-block {
                            border-left: 4px solid ${data.color_code} !important;
                        }
                    `;
                    document.head.appendChild(style);
                }
                
                // Clear existing content
                contentBlocks.innerHTML = '';
                
                // Create content blocks
                if (data.blocks && data.blocks.length > 0) {
                    data.blocks.forEach(block => {
                        // Create block container
                        const blockDiv = document.createElement('div');
                        blockDiv.className = 'content-block fade-in';
                        
                        // Check if block has an image
                        if (block.image) {
                            blockDiv.classList.add('block-with-image');
                            blockDiv.classList.add(`image-${block.image_position || 'left'}`);
                            
                            // Create image container
                            const imageDiv = document.createElement('div');
                            imageDiv.className = 'block-image-container';
                            
                            // Create image element
                            const imageEl = document.createElement('img');
                            imageEl.className = 'block-image';
                            imageEl.src = block.image.src;
                            imageEl.alt = block.image.alt || 'Illustration';
                            
                            imageDiv.appendChild(imageEl);
                            blockDiv.appendChild(imageDiv);
                            
                            // Create content container
                            const contentDiv = document.createElement('div');
                            contentDiv.className = 'block-content-container';
                            
                            // Add block title if present
                            if (block.title) {
                                const titleEl = document.createElement('h3');
                                titleEl.className = 'content-block-title';
                                titleEl.textContent = block.title;
                                contentDiv.appendChild(titleEl);
                            }
                            
                            // Add block content
                            const contentEl = document.createElement('div');
                            contentEl.className = 'content-block-content';
                            contentEl.innerHTML = block.content.replace(/\n/g, '<br>');
                            contentDiv.appendChild(contentEl);
                            
                            blockDiv.appendChild(contentDiv);
                        } else {
                            // No image - simple block
                            
                            // Add block title if present
                            if (block.title) {
                                const titleEl = document.createElement('h3');
                                titleEl.className = 'content-block-title';
                                titleEl.textContent = block.title;
                                blockDiv.appendChild(titleEl);
                            }
                            
                            // Add block content
                            const contentEl = document.createElement('div');
                            contentEl.className = 'content-block-content';
                            contentEl.innerHTML = block.content.replace(/\n/g, '<br>');
                            blockDiv.appendChild(contentEl);
                        }
                        
                        // Add the block to the content area
                        contentBlocks.appendChild(blockDiv);
                    });
                } else {
                    // Fallback to regular content if no blocks
                    const blockDiv = document.createElement('div');
                    blockDiv.className = 'content-block';
                    blockDiv.innerHTML = data.contenu.replace(/\n/g, '<br>');
                    contentBlocks.appendChild(blockDiv);
                }
                
                // Show the content section
                contentSection.classList.remove('d-none');
                contentSection.scrollIntoView({ behavior: 'smooth' });
            }
        })
        .catch(error => {
            console.error('Error loading texte:', error);
        });
}