/* Utility functions — logging, progress, theme */

function addLog(message, type = 'info') {
    const logContent = document.getElementById('logContent');
    const entry = document.createElement('div');
    entry.className = `log-entry ${type}`;
    entry.setAttribute('role', type === 'error' ? 'alert' : 'status');

    const timestamp = new Date().toLocaleTimeString();
    entry.innerHTML = `<strong>${timestamp}</strong> ${message}`;

    logContent.appendChild(entry);
    logContent.scrollTop = logContent.scrollHeight;
}

function clearLog() {
    const logContent = document.getElementById('logContent');
    logContent.innerHTML = '<div class="log-entry" role="status">Initializing...</div>';
}

function updateProgress(percent, message) {
    const fill = document.getElementById('progressFill');
    const pct = document.getElementById('progressPercent');
    const txt = document.getElementById('progressText');

    fill.style.width = percent + '%';
    const progressBar = document.getElementById('progressContainer');
    if (progressBar) progressBar.setAttribute('aria-valuenow', percent);
    pct.textContent = percent + '%';
    txt.textContent = message;
}

/* Dark mode toggle */
function toggleDarkMode() {
    const root = document.documentElement;
    const isDark = root.getAttribute('data-theme') === 'dark';
    root.setAttribute('data-theme', isDark ? 'light' : 'dark');
    localStorage.setItem('theme', isDark ? 'light' : 'dark');
    const btn = document.getElementById('themeToggle');
    if (btn) btn.textContent = isDark ? 'Dark' : 'Light';
}

function loadTheme() {
    const saved = localStorage.getItem('theme');
    if (saved === 'dark') {
        document.documentElement.setAttribute('data-theme', 'dark');
        const btn = document.getElementById('themeToggle');
        if (btn) btn.textContent = 'Light';
    }
}

/* Severity helpers */
function getSeverityColor(severity) {
    const map = { CRITICAL: '#dc2626', ERROR: '#ef4444', WARNING: '#f59e0b', INFO: '#3b82f6', SUCCESS: '#10b981' };
    return map[severity] || '#3b82f6';
}

function getSeverityIcon(severity) {
    const map = { CRITICAL: '\u{1F6A8}', ERROR: '\u274C', WARNING: '\u26A0\uFE0F', INFO: '\u2139\uFE0F', SUCCESS: '\u2705' };
    return map[severity] || '\u2022';
}

/* WCAG 2.1 criterion → Understanding page slug */
const WCAG_SLUGS = {
    '1.1.1': 'non-text-content',
    '1.2.1': 'audio-only-and-video-only-prerecorded',
    '1.2.2': 'captions-prerecorded',
    '1.2.3': 'audio-description-or-media-alternative-prerecorded',
    '1.2.4': 'captions-live',
    '1.2.5': 'audio-description-prerecorded',
    '1.3.1': 'info-and-relationships',
    '1.3.2': 'meaningful-sequence',
    '1.3.3': 'sensory-characteristics',
    '1.3.4': 'orientation',
    '1.3.5': 'identify-input-purpose',
    '1.4.1': 'use-of-color',
    '1.4.2': 'audio-control',
    '1.4.3': 'contrast-minimum',
    '1.4.4': 'resize-text',
    '1.4.5': 'images-of-text',
    '1.4.6': 'contrast-enhanced',
    '1.4.10': 'reflow',
    '1.4.11': 'non-text-contrast',
    '1.4.12': 'text-spacing',
    '1.4.13': 'content-on-hover-or-focus',
    '2.1.1': 'keyboard',
    '2.1.2': 'no-keyboard-trap',
    '2.2.1': 'timing-adjustable',
    '2.2.2': 'pause-stop-hide',
    '2.3.1': 'three-flashes-or-below-threshold',
    '2.4.1': 'bypass-blocks',
    '2.4.2': 'page-titled',
    '2.4.3': 'focus-order',
    '2.4.4': 'link-purpose-in-context',
    '2.4.5': 'multiple-ways',
    '2.4.6': 'headings-and-labels',
    '2.4.7': 'focus-visible',
    '2.5.3': 'label-in-name',
    '3.1.1': 'language-of-page',
    '3.1.2': 'language-of-parts',
    '3.1.5': 'reading-level',
    '3.2.1': 'on-focus',
    '3.2.2': 'on-input',
    '3.2.3': 'consistent-navigation',
    '3.2.4': 'consistent-identification',
    '3.3.1': 'error-identification',
    '3.3.2': 'labels-or-instructions',
    '3.3.3': 'error-suggestion',
    '3.3.4': 'error-prevention-legal-financial-data',
    '4.1.1': 'parsing',
    '4.1.2': 'name-role-value',
    '4.1.3': 'status-messages',
};

/**
 * Returns an HTML string of clickable WCAG criterion links.
 * Handles comma-separated criteria (e.g. "1.3.1, 4.1.2") and "PDF/UA".
 */
function wcagCriterionLinks(criterion) {
    if (!criterion) return '';

    if (criterion.trim().toUpperCase() === 'PDF/UA') {
        return '<a href="https://www.pdfa.org/pdfua/" target="_blank" rel="noopener" class="wcag-link">PDF/UA</a>';
    }

    return criterion.split(',').map(part => {
        const num = part.trim();
        const slug = WCAG_SLUGS[num];
        if (slug) {
            const url = `https://www.w3.org/WAI/WCAG21/Understanding/${slug}`;
            return `<a href="${url}" target="_blank" rel="noopener" class="wcag-link">WCAG ${num}</a>`;
        }
        return `WCAG ${num}`;
    }).join(', ');
}

function escapeAttr(str) {
    return String(str).replace(/\\/g, '\\\\').replace(/'/g, "\\'").replace(/"/g, '&quot;');
}

function getCategoryIcon(category) {
    const icons = {
        'Document Structure': '\u{1F3D7}\uFE0F', 'Metadata': '\u{1F4CB}', 'Language': '\u{1F310}',
        'Text Accessibility': '\u{1F4DD}', 'Images': '\u{1F5BC}\uFE0F', 'Color Contrast': '\u{1F3A8}',
        'Readability': '\u{1F4DA}', 'Link Text': '\u{1F517}', 'Forms': '\u{1F4C4}',
        'Tables': '\u{1F4CA}', 'Headings': '\u{1F4D1}', 'Navigation': '\u{1F9ED}',
        'Fonts': '\u{1F524}', 'Security': '\u{1F512}', 'OCR Quality': '\u{1F50D}'
    };
    const key = Object.keys(icons).find(k => category.includes(k));
    return key ? icons[key] : '\u{1F4CC}';
}