// GhostEditor - Markdown to Word Converter JavaScript
document.addEventListener('DOMContentLoaded', function() {
    // DOM Elements
    const markdownInput = document.getElementById('markdownInput');
    const previewOutput = document.getElementById('previewOutput');
    const previewToggle = document.getElementById('previewToggle');
    const exportBtn = document.getElementById('exportBtn');
    const blockType = document.getElementById('blockType');
    const applyStyle = document.getElementById('applyStyle');
    const applyStyleBtn = document.getElementById('applyStyleBtn');
    const customCaption = document.getElementById('customCaption');
    const applyCaptionBtn = document.getElementById('applyCaptionBtn');
    const autoCaptionImages = document.getElementById('autoCaptionImages');
    const autoCaptionTables = document.getElementById('autoCaptionTables');
    const autoCaptionFigures = document.getElementById('autoCaptionFigures');
    const tablePagination = document.getElementById('tablePagination');
    const boldBtn = document.getElementById('boldBtn');
    const italicBtn = document.getElementById('italicBtn');
    const headingBtn = document.getElementById('headingBtn');
    const listBtn = document.getElementById('listBtn');
    const imageBtn = document.getElementById('imageBtn');
    
    // Configuration
    let config = {
        autoCaptionImages: true,
        autoCaptionTables: true,
        autoCaptionFigures: true,
        tablePagination: true,
        defaultStyle: 'Normal'
    };
    
    // Initialize with sample markdown
    markdownInput.value = `# GhostEditor Sample Document

This is a sample document to demonstrate the real-time conversion capabilities of GhostEditor.

## Features Demonstrated

### Auto-captioning
![Sample Image](https://via.placeholder.com/150)  
*Figure 1: Sample placeholder image*

### Table with Pagination Support
| ID | Name | Role |
|----|------|------|
| 1 | John | Developer |
| 2 | Jane | Designer |
| 3 | Bob | Manager |
| 4 | Alice | Analyst |

### Code Block
\`\`\`python
def hello_world():
    print("Hello, GhostEditor!")
\`\`\`

### Blockquote
> This is a sample quote demonstrating the styling capabilities of GhostEditor.

### List
- First item
- Second item
- Third item`;
    
    // Update configuration when settings change
    autoCaptionImages.addEventListener('change', updateConfig);
    autoCaptionTables.addEventListener('change', updateConfig);
    autoCaptionFigures.addEventListener('change', updateConfig);
    tablePagination.addEventListener('change', updateConfig);
    
    // Toolbar buttons
    boldBtn.addEventListener('click', () => wrapText('**', '**'));
    italicBtn.addEventListener('click', () => wrapText('*', '*'));
    headingBtn.addEventListener('click', () => wrapLine('# '));
    listBtn.addEventListener('click', () => wrapLine('- '));
    imageBtn.addEventListener('click', () => insertImage());
    
    // Apply style button
    applyStyleBtn.addEventListener('click', applyStyleToSelection);
    
    // Apply caption button
    applyCaptionBtn.addEventListener('click', applyCaptionToSelection);
    
    // Export button
    exportBtn.addEventListener('click', exportToWord);
    
    // Initial preview update
    updatePreview();
    
    // Update preview when input changes
    markdownInput.addEventListener('input', updatePreview);
    
    // Update preview when toggle changes
    previewToggle.addEventListener('change', function() {
        if (this.checked) {
            updatePreview();
        } else {
            previewOutput.innerHTML = '<p class="text-muted">Preview is disabled. Enable to see real-time conversion.</p>';
        }
    });
    
    // Update configuration
    function updateConfig() {
        config = {
            autoCaptionImages: autoCaptionImages.checked,
            autoCaptionTables: autoCaptionTables.checked,
            autoCaptionFigures: autoCaptionFigures.checked,
            tablePagination: tablePagination.checked,
            defaultStyle: document.getElementById('defaultStyle').value
        };
        
        // Update preview after config change
        updatePreview();
    }
    
    // Update preview function
    function updatePreview() {
        if (!previewToggle.checked) return;
        
        const markdown = markdownInput.value;
        
        // Convert markdown to HTML using Marked.js
        const html = marked.parse(markdown);
        
        // Process the HTML to add captions and table pagination
        const processedHtml = processHtmlForPreview(html);
        
        previewOutput.innerHTML = processedHtml;
        
        // Add captions to images if enabled
        if (config.autoCaptionImages) {
            addImageCaptions();
        }
    }
    
    // Process HTML for preview with special features
    function processHtmlForPreview(html) {
        let processed = html;
        
        // Add table pagination header if enabled
        if (config.tablePagination) {
            processed = processed.replace(/<table>/g, '<table class="table-pagination">');
        }
        
        return processed;
    }
    
    // Add captions to images
    function addImageCaptions() {
        const images = previewOutput.querySelectorAll('img');
        images.forEach((img, index) => {
            // Check if image already has a caption
            if (!img.nextElementSibling || !img.nextElementSibling.classList.contains('caption')) {
                const caption = document.createElement('div');
                caption.className = 'caption';
                caption.textContent = `Figure ${index + 1}: ${img.alt || 'Image'}`;
                img.parentNode.insertBefore(caption, img.nextSibling);
            }
        });
    }
    
    // Apply style to selected text
    function applyStyleToSelection() {
        const selectedStyle = applyStyle.value;
        const selectedBlock = blockType.value;
        
        // In a real implementation, this would modify the markdown
        // For now, we'll just show a preview of the style
        showStylePreview(selectedStyle);
    }
    
    // Show style preview
    function showStylePreview(style) {
        const previewDiv = document.getElementById('stylePreview');
        
        let styleExample = '';
        switch(style) {
            case 'Heading1':
                styleExample = '<h1>Heading 1 Example</h1>';
                break;
            case 'Heading2':
                styleExample = '<h2>Heading 2 Example</h2>';
                break;
            case 'Heading3':
                styleExample = '<h3>Heading 3 Example</h3>';
                break;
            case 'Quote':
                styleExample = '<blockquote>This is a quote example</blockquote>';
                break;
            case 'Code':
                styleExample = '<code>This is a code example</code>';
                break;
            default:
                styleExample = '<p>This is a normal paragraph example</p>';
        }
        
        previewDiv.innerHTML = styleExample;
    }
    
    // Apply caption to selection
    function applyCaptionToSelection() {
        const captionText = customCaption.value.trim();
        if (!captionText) return;
        
        // In a real implementation, this would add the caption to the markdown
        // For now, we'll just show a notification
        alert(`Caption applied: ${captionText}`);
    }
    
    // Wrap selected text with markdown syntax
    function wrapText(before, after) {
        const start = markdownInput.selectionStart;
        const end = markdownInput.selectionEnd;
        const selectedText = markdownInput.value.substring(start, end);
        
        const newText = before + selectedText + after;
        markdownInput.value = markdownInput.value.substring(0, start) + newText + markdownInput.value.substring(end);
        
        // Update cursor position
        markdownInput.selectionStart = start + before.length;
        markdownInput.selectionEnd = start + before.length + selectedText.length;
        
        updatePreview();
    }
    
    // Wrap current line with markdown syntax
    function wrapLine(prefix) {
        const start = markdownInput.selectionStart;
        const end = markdownInput.selectionEnd;
        const text = markdownInput.value;
        
        // Find start and end of current line
        const lineStart = text.lastIndexOf('\n', start - 1) + 1;
        const lineEnd = text.indexOf('\n', end);
        const actualLineEnd = lineEnd === -1 ? text.length : lineEnd;
        
        const lineText = text.substring(lineStart, actualLineEnd);
        const newLineText = prefix + lineText;
        
        markdownInput.value = text.substring(0, lineStart) + newLineText + text.substring(actualLineEnd);
        
        // Update cursor position
        markdownInput.selectionStart = start + prefix.length;
        markdownInput.selectionEnd = end + prefix.length;
        
        updatePreview();
    }
    
    // Insert image markdown
    function insertImage() {
        const start = markdownInput.selectionStart;
        const end = markdownInput.selectionEnd;
        const selectedText = markdownInput.value.substring(start, end);
        
        const altText = selectedText || 'image';
        const imageMd = `![${altText}](path/to/image.png)`;
        
        markdownInput.value = markdownInput.value.substring(0, start) + imageMd + markdownInput.value.substring(end);
        
        // Update cursor position
        markdownInput.selectionStart = start + 2; // Position cursor in the alt text
        markdownInput.selectionEnd = start + 2 + altText.length;
        
        updatePreview();
    }
    
    // Export to Word functionality
    function exportToWord() {
        // In a real implementation, this would send the markdown to the backend
        // to convert it to Word format
        alert('Exporting to Word document...');
        
        // Create a form to submit the markdown to the backend
        const form = document.createElement('form');
        form.method = 'POST';
        form.action = '/export';
        form.style.display = 'none';
        
        const markdownField = document.createElement('input');
        markdownField.type = 'hidden';
        markdownField.name = 'markdown';
        markdownField.value = markdownInput.value;
        
        const configField = document.createElement('input');
        configField.type = 'hidden';
        configField.name = 'config';
        configField.value = JSON.stringify(config);
        
        form.appendChild(markdownField);
        form.appendChild(configField);
        document.body.appendChild(form);
        form.submit();
        document.body.removeChild(form);
    }
    
    // Initialize style preview
    showStylePreview(config.defaultStyle);
});