var collapsibleTabs = require( '../skins.vector.legacy.js/collapsibleTabs.js' ),
	vector = require( '../skins.vector.legacy.js/vector.js' ),
	initSearchLoader = require( './searchLoader.js' ).initSearchLoader,
	sidebar = require( './sidebar.js' );

/**
 * Wait for first paint before calling this function. That's its whole purpose.
 *
 * Some CSS animations and transitions are "disabled" by default as a workaround to this old Chrome
 * bug, https://bugs.chromium.org/p/chromium/issues/detail?id=332189, which otherwise causes them to
 * render in their terminal state on page load. By adding the `vector-animations-ready` class to the
 * `html` root element **after** first paint, the animation selectors suddenly match causing the
 * animations to become "enabled" when they will work properly. A similar pattern is used in Minerva
 * (see T234570#5779890, T246419).
 *
 * Example usage in Less:
 *
 * ```less
 * .foo {
 *     color: #f00;
 *     .transform( translateX( -100% ) );
 * }
 *
 * // This transition will be disabled initially for JavaScript users. It will never be enabled for
 * // no-JS users.
 * .vector-animations-ready .foo {
 *     .transition( transform 100ms ease-out; );
 * }
 * ```
 *
 * @param {Document} document
 * @return {void}
 */
function enableCssAnimations( document ) {
	document.documentElement.classList.add( 'vector-animations-ready' );
}

/**
 * @param {Window} window
 * @return {void}
 */
function main( window ) {
	var
		ulsModuleStatus = mw.loader.getState( 'ext.uls.interface' ),
		pLangBtnLabel;

	enableCssAnimations( window.document );
	collapsibleTabs.init();
	sidebar.init( window );
	$( vector.init );
	initSearchLoader( document );
	if ( ulsModuleStatus && ulsModuleStatus !== 'registered' ) {
		mw.loader.using( 'ext.uls.interface' ).then( function () {
			var pLangBtn = document.getElementById( 'p-lang-btn' );
			if ( !pLangBtn ) {
				return;
			}

			pLangBtn.classList.add( 'vector-menu--hide-dropdown' );
		} );
	} else {
		pLangBtnLabel = document.getElementById( 'p-lang-btn-label' );
		if ( !pLangBtnLabel ) {
			return;
		}

		// Remove .mw-interlanguage-selector to show the dropdown arrow since evidently
		// ULS is not used.
		pLangBtnLabel.classList.remove( 'mw-interlanguage-selector' );
	}
}

main( window );