/**
 * Simple Markdown Parser for Tinker Tickets
 * Supports basic markdown formatting without external dependencies
 */

function parseMarkdown(markdown) {
    if (!markdown) return '';

    let html = markdown;

    // Escape HTML first to prevent XSS
    html = html.replace(/&/g, '&')
               .replace(/</g, '&lt;')
               .replace(/>/g, '&gt;');

    // Ticket references (#123456789) - convert to clickable links
    html = html.replace(/#(\d{9})\b/g, '<a href="/ticket/$1" class="ticket-link-ref">#$1</a>');

    // Code blocks (```code```)
    html = html.replace(/```([\s\S]*?)```/g, '<pre class="code-block"><code>$1</code></pre>');

    // Inline code (`code`)
    html = html.replace(/`([^`]+)`/g, '<code class="inline-code">$1</code>');

    // Bold (**text** or __text__)
    html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
    html = html.replace(/__(.+?)__/g, '<strong>$1</strong>');

    // Italic (*text* or _text_)
    html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
    html = html.replace(/_(.+?)_/g, '<em>$1</em>');

    // Links [text](url) - only allow safe protocols
    html = html.replace(/\[([^\]]+)\]\(([^)]+)\)/g, function(match, text, url) {
        // Only allow http, https, mailto protocols
        if (/^(https?:|mailto:|\/)/i.test(url)) {
            return '<a href="' + url + '" target="_blank" rel="noopener noreferrer">' + text + '</a>';
        }
        // Block potentially dangerous protocols (javascript:, data:, etc.)
        return text;
    });

    // Headers (# H1, ## H2, etc.)
    html = html.replace(/^### (.+)$/gm, '<h3>$1</h3>');
    html = html.replace(/^## (.+)$/gm, '<h2>$1</h2>');
    html = html.replace(/^# (.+)$/gm, '<h1>$1</h1>');

    // Lists
    // Unordered lists (- item or * item)
    html = html.replace(/^\s*[-*]\s+(.+)$/gm, '<li>$1</li>');
    html = html.replace(/(<li>.*<\/li>)/s, '<ul>$1</ul>');

    // Ordered lists (1. item)
    html = html.replace(/^\s*\d+\.\s+(.+)$/gm, '<li>$1</li>');

    // Blockquotes (> text)
    html = html.replace(/^>\s+(.+)$/gm, '<blockquote>$1</blockquote>');

    // Horizontal rules (--- or ***)
    html = html.replace(/^(?:---|___|\*\*\*)$/gm, '<hr>');

    // Line breaks (two spaces at end of line or double newline)
    html = html.replace(/  \n/g, '<br>');
    html = html.replace(/\n\n/g, '</p><p>');

    // Wrap in paragraph if not already wrapped
    if (!html.startsWith('<')) {
        html = '<p>' + html + '</p>';
    }

    return html;
}

// Apply markdown rendering to all elements with data-markdown attribute
function renderMarkdownElements() {
    document.querySelectorAll('[data-markdown]').forEach(element => {
        const markdownText = element.getAttribute('data-markdown') || element.textContent;
        element.innerHTML = parseMarkdown(markdownText);
    });
}

// Apply markdown to description and comments on page load
document.addEventListener('DOMContentLoaded', renderMarkdownElements);

// Expose for manual use
window.parseMarkdown = parseMarkdown;
window.renderMarkdownElements = renderMarkdownElements;

// ========================================
// Rich Text Editor Toolbar Functions
// ========================================

/**
 * Insert markdown formatting around selection
 */
function insertMarkdownFormat(textareaId, prefix, suffix) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const start = textarea.selectionStart;
    const end = textarea.selectionEnd;
    const text = textarea.value;
    const selectedText = text.substring(start, end);

    // Insert formatting
    const newText = text.substring(0, start) + prefix + selectedText + suffix + text.substring(end);
    textarea.value = newText;

    // Set cursor position
    if (selectedText) {
        textarea.setSelectionRange(start + prefix.length, end + prefix.length);
    } else {
        textarea.setSelectionRange(start + prefix.length, start + prefix.length);
    }

    textarea.focus();

    // Trigger input event to update preview if enabled
    textarea.dispatchEvent(new Event('input', { bubbles: true }));
}

/**
 * Insert markdown at cursor position
 */
function insertMarkdownText(textareaId, text) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const start = textarea.selectionStart;
    const value = textarea.value;

    textarea.value = value.substring(0, start) + text + value.substring(start);
    textarea.setSelectionRange(start + text.length, start + text.length);
    textarea.focus();

    textarea.dispatchEvent(new Event('input', { bubbles: true }));
}

/**
 * Toolbar button handlers
 */
function toolbarBold(textareaId) {
    insertMarkdownFormat(textareaId, '**', '**');
}

function toolbarItalic(textareaId) {
    insertMarkdownFormat(textareaId, '_', '_');
}

function toolbarCode(textareaId) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const selectedText = textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);

    // Use code block for multi-line, inline code for single line
    if (selectedText.includes('\n')) {
        insertMarkdownFormat(textareaId, '```\n', '\n```');
    } else {
        insertMarkdownFormat(textareaId, '`', '`');
    }
}

function toolbarLink(textareaId) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const selectedText = textarea.value.substring(textarea.selectionStart, textarea.selectionEnd);

    if (selectedText) {
        // Wrap selected text as link text
        insertMarkdownFormat(textareaId, '[', '](url)');
    } else {
        insertMarkdownText(textareaId, '[link text](url)');
    }
}

function toolbarList(textareaId) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const start = textarea.selectionStart;
    const text = textarea.value;

    // Find start of current line
    let lineStart = start;
    while (lineStart > 0 && text[lineStart - 1] !== '\n') {
        lineStart--;
    }

    // Insert list marker at beginning of line
    textarea.value = text.substring(0, lineStart) + '- ' + text.substring(lineStart);
    textarea.setSelectionRange(start + 2, start + 2);
    textarea.focus();

    textarea.dispatchEvent(new Event('input', { bubbles: true }));
}

function toolbarHeading(textareaId) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const start = textarea.selectionStart;
    const text = textarea.value;

    // Find start of current line
    let lineStart = start;
    while (lineStart > 0 && text[lineStart - 1] !== '\n') {
        lineStart--;
    }

    // Insert heading marker at beginning of line
    textarea.value = text.substring(0, lineStart) + '## ' + text.substring(lineStart);
    textarea.setSelectionRange(start + 3, start + 3);
    textarea.focus();

    textarea.dispatchEvent(new Event('input', { bubbles: true }));
}

function toolbarQuote(textareaId) {
    const textarea = document.getElementById(textareaId);
    if (!textarea) return;

    const start = textarea.selectionStart;
    const text = textarea.value;

    // Find start of current line
    let lineStart = start;
    while (lineStart > 0 && text[lineStart - 1] !== '\n') {
        lineStart--;
    }

    // Insert quote marker at beginning of line
    textarea.value = text.substring(0, lineStart) + '> ' + text.substring(lineStart);
    textarea.setSelectionRange(start + 2, start + 2);
    textarea.focus();

    textarea.dispatchEvent(new Event('input', { bubbles: true }));
}

/**
 * Create and insert toolbar HTML for a textarea
 */
function createEditorToolbar(textareaId, containerId) {
    const container = document.getElementById(containerId);
    if (!container) return;

    const toolbar = document.createElement('div');
    toolbar.className = 'editor-toolbar';
    toolbar.innerHTML = `
        <button type="button" onclick="toolbarBold('${textareaId}')" title="Bold (Ctrl+B)"><b>B</b></button>
        <button type="button" onclick="toolbarItalic('${textareaId}')" title="Italic (Ctrl+I)"><i>I</i></button>
        <button type="button" onclick="toolbarCode('${textareaId}')" title="Code">&lt;/&gt;</button>
        <span class="toolbar-separator"></span>
        <button type="button" onclick="toolbarHeading('${textareaId}')" title="Heading">H</button>
        <button type="button" onclick="toolbarList('${textareaId}')" title="List">≡</button>
        <button type="button" onclick="toolbarQuote('${textareaId}')" title="Quote">"</button>
        <span class="toolbar-separator"></span>
        <button type="button" onclick="toolbarLink('${textareaId}')" title="Link">🔗</button>
    `;

    container.insertBefore(toolbar, container.firstChild);
}

// Expose toolbar functions globally
window.toolbarBold = toolbarBold;
window.toolbarItalic = toolbarItalic;
window.toolbarCode = toolbarCode;
window.toolbarLink = toolbarLink;
window.toolbarList = toolbarList;
window.toolbarHeading = toolbarHeading;
window.toolbarQuote = toolbarQuote;
window.createEditorToolbar = createEditorToolbar;
window.insertMarkdownFormat = insertMarkdownFormat;
window.insertMarkdownText = insertMarkdownText;