/**
 * Simple WYSIWYG Editor
 * Lightweight rich text editor for publication content
 */

class WYSIWYGEditor {
    constructor(textareaId, options = {}) {
        this.textarea = document.getElementById(textareaId);
        this.options = {
            toolbar: ['bold', 'italic', 'underline', '|', 'link', 'image', '|', 'ul', 'ol', '|', 'h1', 'h2', 'h3'],
            ...options
        };
        
        this.createEditor();
        this.bindEvents();
    }
    
    createEditor() {
        // Create editor container
        this.container = document.createElement('div');
        this.container.className = 'wysiwyg-container';
        
        // Create toolbar
        this.toolbar = document.createElement('div');
        this.toolbar.className = 'wysiwyg-toolbar';
        this.createToolbarButtons();
        
        // Create content area
        this.content = document.createElement('div');
        this.content.className = 'wysiwyg-content';
        this.content.contentEditable = true;
        
        // Create character count
        this.charCount = document.createElement('div');
        this.charCount.className = 'wysiwyg-char-count';
        
        // Assemble editor
        this.container.appendChild(this.toolbar);
        this.container.appendChild(this.content);
        this.container.appendChild(this.charCount);
        
        // Replace textarea
        this.textarea.parentNode.insertBefore(this.container, this.textarea);
        this.textarea.style.display = 'none';
        
        // Initialize content
        this.content.innerHTML = this.textarea.value;
        this.updateCharCount();
    }
    
    createToolbarButtons() {
        this.options.toolbar.forEach(item => {
            if (item === '|') {
                const separator = document.createElement('div');
                separator.className = 'wysiwyg-separator';
                this.toolbar.appendChild(separator);
            } else {
                const button = document.createElement('button');
                button.className = 'wysiwyg-btn';
                button.type = 'button';
                button.innerHTML = this.getButtonLabel(item);
                button.dataset.command = item;
                
                button.addEventListener('click', () => this.execCommand(item));
                this.toolbar.appendChild(button);
            }
        });
    }
    
    getButtonLabel(command) {
        const labels = {
            'bold': 'B',
            'italic': 'I',
            'underline': 'U',
            'link': '🔗',
            'image': '🖼️',
            'ul': '• List',
            'ol': '1. List',
            'h1': 'H1',
            'h2': 'H2',
            'h3': 'H3'
        };
        return labels[command] || command;
    }
    
    execCommand(command) {
        switch (command) {
            case 'bold':
                document.execCommand('bold', false, null);
                break;
            case 'italic':
                document.execCommand('italic', false, null);
                break;
            case 'underline':
                document.execCommand('underline', false, null);
                break;
            case 'link':
                this.insertLink();
                break;
            case 'image':
                this.insertImage();
                break;
            case 'ul':
                document.execCommand('insertUnorderedList', false, null);
                break;
            case 'ol':
                document.execCommand('insertOrderedList', false, null);
                break;
            case 'h1':
                this.formatHeading('h1');
                break;
            case 'h2':
                this.formatHeading('h2');
                break;
            case 'h3':
                this.formatHeading('h3');
                break;
        }
        
        this.content.focus();
    }
    
    insertLink() {
        const selection = window.getSelection();
        const url = prompt('Enter URL:');
        if (url) {
            document.execCommand('createLink', false, url);
        }
    }
    
    insertImage() {
        const url = prompt('Enter image URL:');
        if (url) {
            document.execCommand('insertImage', false, url);
        }
    }
    
    formatHeading(tag) {
        const selection = window.getSelection();
        const range = selection.getRangeAt(0);
        const heading = document.createElement(tag);
        heading.textContent = range.toString();
        range.deleteContents();
        range.insertNode(heading);
    }
    
    bindEvents() {
        // Update textarea when content changes
        this.content.addEventListener('input', () => {
            this.textarea.value = this.content.innerHTML;
            this.updateCharCount();
        });
        
        // Update content when textarea changes (for form submission)
        this.textarea.addEventListener('input', () => {
            this.content.innerHTML = this.textarea.value;
            this.updateCharCount();
        });
        
        // Handle paste events
        this.content.addEventListener('paste', (e) => {
            e.preventDefault();
            const text = e.clipboardData.getData('text/html') || e.clipboardData.getData('text/plain');
            document.execCommand('insertHTML', false, text);
        });
        
        // Keyboard shortcuts
        this.content.addEventListener('keydown', (e) => {
            if (e.ctrlKey || e.metaKey) {
                switch (e.key) {
                    case 'b':
                        e.preventDefault();
                        this.execCommand('bold');
                        break;
                    case 'i':
                        e.preventDefault();
                        this.execCommand('italic');
                        break;
                    case 'u':
                        e.preventDefault();
                        this.execCommand('underline');
                        break;
                }
            }
        });
    }
    
    updateCharCount() {
        const text = this.content.innerText || this.content.textContent || '';
        const count = text.length;
        this.charCount.textContent = `Characters: ${count}`;
    }
    
    getContent() {
        return this.content.innerHTML;
    }
    
    setContent(html) {
        this.content.innerHTML = html;
        this.textarea.value = html;
        this.updateCharCount();
    }
    
    destroy() {
        this.textarea.style.display = 'block';
        this.textarea.value = this.content.innerHTML;
        this.container.remove();
    }
}

// Initialize editor when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    const editor = new WYSIWYGEditor('content');
    
    // Make editor globally accessible
    window.wysiwygEditor = editor;
    
    // Handle form submission
    const form = document.querySelector('.publication-form');
    if (form) {
        form.addEventListener('submit', () => {
            // Ensure textarea has latest content
            document.getElementById('content').value = editor.getContent();
        });
    }
});