/**
 * Main Application
 * Coordinates all modules and handles user interactions
 */

// Global state
let webdavClient;
let fileTree;
let editor;
let darkMode;
let collectionSelector;
let clipboard = null;
let currentFilePath = null;

// Simple event bus
const eventBus = {
    listeners: {},
    on(event, callback) {
        if (!this.listeners[event]) {
            this.listeners[event] = [];
        }
        this.listeners[event].push(callback);
    },
    dispatch(event, data) {
        if (this.listeners[event]) {
            this.listeners[event].forEach(callback => callback(data));
        }
    }
};
window.eventBus = eventBus;

// Initialize application
document.addEventListener('DOMContentLoaded', async () => {
    // Initialize WebDAV client
    webdavClient = new WebDAVClient('/fs/');
    
    // Initialize dark mode
    darkMode = new DarkMode();
    document.getElementById('darkModeBtn').addEventListener('click', () => {
        darkMode.toggle();
    });
    
    // Initialize file tree
    fileTree = new FileTree('fileTree', webdavClient);
    fileTree.onFileSelect = async (item) => {
        await editor.loadFile(item.path);
    };
    
    // Initialize collection selector
    collectionSelector = new CollectionSelector('collectionSelect', webdavClient);
    collectionSelector.onChange = async (collection) => {
        await fileTree.load();
    };
    await collectionSelector.load();
    await fileTree.load();
    
    // Initialize editor
    editor = new MarkdownEditor('editor', 'preview', 'filenameInput');
    editor.setWebDAVClient(webdavClient);

    // Add test content to verify preview works
    setTimeout(() => {
        if (!editor.editor.getValue()) {
            editor.editor.setValue('# Welcome to Markdown Editor\n\nStart typing to see preview...\n');
            editor.updatePreview();
        }
    }, 200);
    
    // Setup editor drop handler
    const editorDropHandler = new EditorDropHandler(
        document.querySelector('.editor-container'),
        async (file) => {
            await handleEditorFileDrop(file);
        }
    );
    
    // Setup button handlers
    document.getElementById('newBtn').addEventListener('click', () => {
        editor.newFile();
    });
    
    document.getElementById('saveBtn').addEventListener('click', async () => {
        await editor.save();
    });
    
    document.getElementById('deleteBtn').addEventListener('click', async () => {
        await editor.deleteFile();
    });
    
    // Setup context menu handlers
    setupContextMenuHandlers();
    
    // Initialize mermaid
    mermaid.initialize({ startOnLoad: true, theme: darkMode.isDark ? 'dark' : 'default' });

    // Initialize file tree actions manager
    window.fileTreeActions = new FileTreeActions(webdavClient, fileTree, editor);
    // Listen for file-saved event to reload file tree
    window.eventBus.on('file-saved', async (path) => {
        if (fileTree) {
            await fileTree.load();
            fileTree.selectNode(path);
        }
    });
});

// Listen for column resize events to refresh editor
window.addEventListener('column-resize', () => {
    if (editor && editor.editor) {
        editor.editor.refresh();
    }
});

/**
 * File Operations
 */

/**
 * Context Menu Handlers
 */
function setupContextMenuHandlers() {
    const menu = document.getElementById('contextMenu');
    
    menu.addEventListener('click', async (e) => {
        const item = e.target.closest('.context-menu-item');
        if (!item) return;
        
        const action = item.dataset.action;
        const targetPath = menu.dataset.targetPath;
        const isDir = menu.dataset.targetIsDir === 'true';
        
        hideContextMenu();
        
        await handleContextAction(action, targetPath, isDir);
    });
}

async function handleContextAction(action, targetPath, isDir) {
    switch (action) {
        case 'open':
            if (!isDir) {
                await editor.loadFile(targetPath);
            }
            break;
            
        case 'new-file':
            if (isDir) {
                const filename = prompt('Enter filename:');
                if (filename) {
                    await fileTree.createFile(targetPath, filename);
                }
            }
            break;
            
        case 'new-folder':
            if (isDir) {
                const foldername = prompt('Enter folder name:');
                if (foldername) {
                    await fileTree.createFolder(targetPath, foldername);
                }
            }
            break;
            
        case 'upload':
            if (isDir) {
                showFileUploadDialog(targetPath, async (path, file) => {
                    await fileTree.uploadFile(path, file);
                });
            }
            break;
            
        case 'download':
            if (isDir) {
                await fileTree.downloadFolder(targetPath);
            } else {
                await fileTree.downloadFile(targetPath);
            }
            break;
            
        case 'rename':
            const newName = prompt('Enter new name:', targetPath.split('/').pop());
            if (newName) {
                const parentPath = targetPath.split('/').slice(0, -1).join('/');
                const newPath = parentPath ? `${parentPath}/${newName}` : newName;
                try {
                    await webdavClient.move(targetPath, newPath);
                    await fileTree.load();
                    showNotification('Renamed', 'success');
                } catch (error) {
                    console.error('Failed to rename:', error);
                    showNotification('Failed to rename', 'error');
                }
            }
            break;
            
        case 'copy':
            clipboard = { path: targetPath, operation: 'copy' };
            showNotification('Copied to clipboard', 'info');
            updatePasteVisibility();
            break;
            
        case 'cut':
            clipboard = { path: targetPath, operation: 'cut' };
            showNotification('Cut to clipboard', 'info');
            updatePasteVisibility();
            break;
            
        case 'paste':
            if (clipboard && isDir) {
                const filename = clipboard.path.split('/').pop();
                const destPath = `${targetPath}/${filename}`;
                
                try {
                    if (clipboard.operation === 'copy') {
                        await webdavClient.copy(clipboard.path, destPath);
                        showNotification('Copied', 'success');
                    } else {
                        await webdavClient.move(clipboard.path, destPath);
                        showNotification('Moved', 'success');
                        clipboard = null;
                        updatePasteVisibility();
                    }
                    await fileTree.load();
                } catch (error) {
                    console.error('Failed to paste:', error);
                    showNotification('Failed to paste', 'error');
                }
            }
            break;
            
        case 'delete':
            if (confirm(`Delete ${targetPath}?`)) {
                try {
                    await webdavClient.delete(targetPath);
                    await fileTree.load();
                    showNotification('Deleted', 'success');
                } catch (error) {
                    console.error('Failed to delete:', error);
                    showNotification('Failed to delete', 'error');
                }
            }
            break;
    }
}

function updatePasteVisibility() {
    const pasteItem = document.getElementById('pasteMenuItem');
    if (pasteItem) {
        pasteItem.style.display = clipboard ? 'block' : 'none';
    }
}

/**
 * Editor File Drop Handler
 */
async function handleEditorFileDrop(file) {
    try {
        // Get current file's directory
        let targetDir = '';
        if (currentFilePath) {
            const parts = currentFilePath.split('/');
            parts.pop(); // Remove filename
            targetDir = parts.join('/');
        }
        
        // Upload file
        const uploadedPath = await fileTree.uploadFile(targetDir, file);
        
        // Insert markdown link at cursor
        const isImage = file.type.startsWith('image/');
        const link = isImage 
            ? `![${file.name}](/${webdavClient.currentCollection}/${uploadedPath})`
            : `[${file.name}](/${webdavClient.currentCollection}/${uploadedPath})`;
        
        editor.insertAtCursor(link);
        showNotification(`Uploaded and inserted link`, 'success');
    } catch (error) {
        console.error('Failed to handle file drop:', error);
        showNotification('Failed to upload file', 'error');
    }
}

// Make showContextMenu global
window.showContextMenu = showContextMenu;