MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/**
 * Night Mode Toggle for Minerva Neue
 * Adds a sticky toggle button that persists user preference in localStorage
 */
(function () {
    'use strict';

    var STORAGE_KEY = 'minerva-night-mode';

    // SVG icons (24x24)
    var MOON_SVG = '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg>';
    var SUN_SVG = '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg>';

    /**
     * Get saved theme or default to 'day'
     */
    function getSavedTheme() {
        try {
            return localStorage.getItem(STORAGE_KEY) || 'day';
        } catch (e) {
            return 'day';
        }
    }

    /**
     * Save theme preference
     */
    function saveTheme(theme) {
        try {
            localStorage.setItem(STORAGE_KEY, theme);
        } catch (e) {
            // localStorage unavailable
        }
    }

    /**
     * Apply theme via inline style injection (prevents FOUC)
     * This runs immediately, before DOM is ready
     */
    function applyThemeImmediate(theme) {
        // Remove any existing theme style tag
        var existingStyle = document.getElementById('night-mode-immediate');
        if (existingStyle) {
            existingStyle.parentNode.removeChild(existingStyle);
        }

        // Inject style tag into head immediately
        var style = document.createElement('style');
        style.id = 'night-mode-immediate';
        
        if (theme === 'night') {
            // Apply night mode class to html element
            style.textContent = 'html { color-scheme: dark; }';
            document.documentElement.classList.remove('skin-theme-clientpref-day');
            document.documentElement.classList.add('skin-theme-clientpref-night');
        } else {
            style.textContent = 'html { color-scheme: light; }';
            document.documentElement.classList.remove('skin-theme-clientpref-night');
            document.documentElement.classList.add('skin-theme-clientpref-day');
        }

        // Insert into head as early as possible
        var head = document.head || document.getElementsByTagName('head')[0];
        if (head) {
            head.insertBefore(style, head.firstChild);
        }
    }

    /**
     * Update button appearance
     */
    function updateButtonState(button, theme) {
        var icon = button.querySelector('.minerva-icon');
        var label = button.querySelector('.toggle-label');
        
        if (theme === 'night') {
            icon.innerHTML = SUN_SVG;
            if (label) label.textContent = 'Light mode';
            button.setAttribute('title', 'Switch to light mode');
        } else {
            icon.innerHTML = MOON_SVG;
            if (label) label.textContent = 'Dark mode';
            button.setAttribute('title', 'Switch to dark mode');
        }
    }

    /**
     * Create the toggle button element
     */
    function createToggleButton() {
        var currentTheme = getSavedTheme();

        var li = document.createElement('li');
        
        var button = document.createElement('a');
        button.setAttribute('role', 'button');
        button.setAttribute('href', '#');
        button.id = 'ca-nightmode';
        button.className = 'cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet';
        button.style.cursor = 'pointer';

        var icon = document.createElement('span');
        icon.className = 'minerva-icon';
        icon.style.display = 'flex';
        icon.style.alignItems = 'center';
        icon.style.justifyContent = 'center';
        icon.style.width = '20px';
        icon.style.height = '20px';

        var label = document.createElement('span');
        label.className = 'toggle-label';
        // Visually hidden but accessible
        label.style.cssText = 'position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0;';
        
        button.appendChild(icon);
        button.appendChild(label);
        li.appendChild(button);

        // Set initial state
        updateButtonState(button, currentTheme);

        // Handle click
        button.addEventListener('click', function (e) {
            e.preventDefault();
            var newTheme = getSavedTheme() === 'night' ? 'day' : 'night';
            saveTheme(newTheme);
            applyThemeImmediate(newTheme);
            updateButtonState(button, newTheme);
        });

        return li;
    }

    /**
     * Insert button into the navigation
     */
    function insertButton() {
        var notificationsList = document.querySelector('.minerva-notifications ul');
        
        if (notificationsList) {
            var toggleButton = createToggleButton();
            notificationsList.appendChild(toggleButton);
        } else {
            // Fallback: try inserting into minerva-user-navigation
            var userNav = document.querySelector('.minerva-user-navigation');
            if (userNav) {
                var container = document.createElement('div');
                container.className = 'minerva-notifications';
                var ul = document.createElement('ul');
                ul.appendChild(createToggleButton());
                container.appendChild(ul);
                userNav.insertBefore(container, userNav.firstChild);
            }
        }
    }

    /**
     * Initialize
     */
    function init() {
        // Apply saved theme IMMEDIATELY (this is the key to preventing FOUC)
        applyThemeImmediate(getSavedTheme());

        // Insert button when DOM is ready
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', insertButton);
        } else {
            insertButton();
        }
    }

    // Run immediately
    init();
})();