/**
 * UI Utilities Module
 * Toast notifications, context menu, dark mode, file upload dialog
 */

/**
 * Show toast notification
 */
function showNotification(message, type = 'info') {
    const container = document.getElementById('toastContainer') || createToastContainer();
    
    const toast = document.createElement('div');
    const bgClass = type === 'error' ? 'danger' : type === 'success' ? 'success' : type === 'warning' ? 'warning' : 'primary';
    toast.className = `toast align-items-center text-white bg-${bgClass} border-0`;
    toast.setAttribute('role', 'alert');
    
    toast.innerHTML = `
        <div class="d-flex">
            <div class="toast-body">${message}</div>
            <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
        </div>
    `;
    
    container.appendChild(toast);
    
    const bsToast = new bootstrap.Toast(toast, { delay: 3000 });
    bsToast.show();
    
    toast.addEventListener('hidden.bs.toast', () => {
        toast.remove();
    });
}

function createToastContainer() {
    const container = document.createElement('div');
    container.id = 'toastContainer';
    container.className = 'toast-container position-fixed top-0 end-0 p-3';
    container.style.zIndex = '9999';
    document.body.appendChild(container);
    return container;
}

/**
 * Enhanced Context Menu
 */
function showContextMenu(x, y, target) {
    const menu = document.getElementById('contextMenu');
    if (!menu) return;
    
    // Store target
    menu.dataset.targetPath = target.path;
    menu.dataset.targetIsDir = target.isDir;
    
    // Show/hide menu items based on target type
    const newFileItem = menu.querySelector('[data-action="new-file"]');
    const newFolderItem = menu.querySelector('[data-action="new-folder"]');
    const uploadItem = menu.querySelector('[data-action="upload"]');
    const downloadItem = menu.querySelector('[data-action="download"]');
    
    if (target.isDir) {
        // Folder context menu
        if (newFileItem) newFileItem.style.display = 'block';
        if (newFolderItem) newFolderItem.style.display = 'block';
        if (uploadItem) uploadItem.style.display = 'block';
        if (downloadItem) downloadItem.style.display = 'block';
    } else {
        // File context menu
        if (newFileItem) newFileItem.style.display = 'none';
        if (newFolderItem) newFolderItem.style.display = 'none';
        if (uploadItem) uploadItem.style.display = 'none';
        if (downloadItem) downloadItem.style.display = 'block';
    }
    
    // Position menu
    menu.style.display = 'block';
    menu.style.left = x + 'px';
    menu.style.top = y + 'px';
    
    // Adjust if off-screen
    const rect = menu.getBoundingClientRect();
    if (rect.right > window.innerWidth) {
        menu.style.left = (window.innerWidth - rect.width - 10) + 'px';
    }
    if (rect.bottom > window.innerHeight) {
        menu.style.top = (window.innerHeight - rect.height - 10) + 'px';
    }
}

function hideContextMenu() {
    const menu = document.getElementById('contextMenu');
    if (menu) {
        menu.style.display = 'none';
    }
}

// Hide context menu on click outside
document.addEventListener('click', (e) => {
    if (!e.target.closest('#contextMenu')) {
        hideContextMenu();
    }
});

/**
 * File Upload Dialog
 */
function showFileUploadDialog(targetPath, onUpload) {
    const input = document.createElement('input');
    input.type = 'file';
    input.multiple = true;
    
    input.addEventListener('change', async (e) => {
        const files = Array.from(e.target.files);
        if (files.length === 0) return;
        
        for (const file of files) {
            try {
                await onUpload(targetPath, file);
            } catch (error) {
                console.error('Upload failed:', error);
            }
        }
    });
    
    input.click();
}

/**
 * Dark Mode Manager
 */
class DarkMode {
    constructor() {
        this.isDark = localStorage.getItem('darkMode') === 'true';
        this.apply();
    }
    
    toggle() {
        this.isDark = !this.isDark;
        localStorage.setItem('darkMode', this.isDark);
        this.apply();
    }
    
    apply() {
        if (this.isDark) {
            document.body.classList.add('dark-mode');
            const btn = document.getElementById('darkModeBtn');
            if (btn) btn.textContent = '☀️';
            
            // Update mermaid theme
            if (window.mermaid) {
                mermaid.initialize({ theme: 'dark' });
            }
        } else {
            document.body.classList.remove('dark-mode');
            const btn = document.getElementById('darkModeBtn');
            if (btn) btn.textContent = '🌙';
            
            // Update mermaid theme
            if (window.mermaid) {
                mermaid.initialize({ theme: 'default' });
            }
        }
    }
}

/**
 * Collection Selector
 */
class CollectionSelector {
    constructor(selectId, webdavClient) {
        this.select = document.getElementById(selectId);
        this.webdavClient = webdavClient;
        this.onChange = null;
    }
    
    async load() {
        try {
            const collections = await this.webdavClient.getCollections();
            this.select.innerHTML = '';
            
            collections.forEach(collection => {
                const option = document.createElement('option');
                option.value = collection;
                option.textContent = collection;
                this.select.appendChild(option);
            });
            
            // Select first collection
            if (collections.length > 0) {
                this.select.value = collections[0];
                this.webdavClient.setCollection(collections[0]);
                if (this.onChange) {
                    this.onChange(collections[0]);
                }
            }
            
            // Add change listener
            this.select.addEventListener('change', () => {
                const collection = this.select.value;
                this.webdavClient.setCollection(collection);
                if (this.onChange) {
                    this.onChange(collection);
                }
            });
        } catch (error) {
            console.error('Failed to load collections:', error);
            showNotification('Failed to load collections', 'error');
        }
    }
}

/**
 * Editor Drop Handler
 * Handles file drops into the editor
 */
class EditorDropHandler {
    constructor(editorElement, onFileDrop) {
        this.editorElement = editorElement;
        this.onFileDrop = onFileDrop;
        this.setupHandlers();
    }
    
    setupHandlers() {
        this.editorElement.addEventListener('dragover', (e) => {
            e.preventDefault();
            e.stopPropagation();
            this.editorElement.classList.add('drag-over');
        });
        
        this.editorElement.addEventListener('dragleave', (e) => {
            e.preventDefault();
            e.stopPropagation();
            this.editorElement.classList.remove('drag-over');
        });
        
        this.editorElement.addEventListener('drop', async (e) => {
            e.preventDefault();
            e.stopPropagation();
            this.editorElement.classList.remove('drag-over');
            
            const files = Array.from(e.dataTransfer.files);
            if (files.length === 0) return;
            
            for (const file of files) {
                try {
                    if (this.onFileDrop) {
                        await this.onFileDrop(file);
                    }
                } catch (error) {
                    console.error('Drop failed:', error);
                    showNotification(`Failed to upload ${file.name}`, 'error');
                }
            }
        });
    }
}