<?php
/**
 * Applies saved Atomic settings on the public front end.
 *
 * @package ReactWoo\Atomic
 */

namespace ReactWoo\Atomic\Admin;

use ReactWoo\Atomic\Admin\Settings\Repository;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Body classes + reduced-motion CSS from Settings repository.
 */
final class Frontend_Prefs {

	/**
	 * @return void
	 */
	public static function init() {
		add_filter( 'body_class', array( __CLASS__, 'body_class' ) );
		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue_motion_css' ), 20 );
	}

	/**
	 * @param array<int, string> $classes Body classes.
	 * @return array<int, string>
	 */
	public static function body_class( $classes ) {
		if ( ! is_array( $classes ) ) {
			$classes = array();
		}
		if ( Repository::get( 'a11y_defaults', 1 ) ) {
			$classes[] = 'rwa-a11y';
		}
		$motion = (string) Repository::get( 'reduced_motion', 'respect' );
		if ( 'force' === $motion ) {
			$classes[] = 'rwa-reduce-motion';
		} elseif ( 'off' === $motion ) {
			$classes[] = 'rwa-motion-ok';
		}
		return $classes;
	}

	/**
	 * Print reduced-motion rules through the style queue.
	 *
	 * @return void
	 */
	public static function enqueue_motion_css() {
		$css = self::motion_css();
		if ( '' === $css ) {
			return;
		}
		$handle = 'rwa-reduced-motion';
		wp_register_style( $handle, false, array(), \ReactWoo\Atomic\Runtime\Env::version() );
		wp_enqueue_style( $handle );
		wp_add_inline_style( $handle, $css );
	}

	/**
	 * @return string CSS rules, or empty when motion is left alone.
	 */
	private static function motion_css() {
		$motion = (string) Repository::get( 'reduced_motion', 'respect' );
		if ( 'force' === $motion ) {
			return '.rwa-reduce-motion *,.rwa-reduce-motion *::before,.rwa-reduce-motion *::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}';
		}
		if ( 'respect' === $motion ) {
			return '@media (prefers-reduced-motion:reduce){html:not(.rwa-motion-ok) *,html:not(.rwa-motion-ok) *::before,html:not(.rwa-motion-ok) *::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}';
		}
		return '';
	}

	/**
	 * Whether enabled element assets should be enqueued site-wide.
	 *
	 * @return bool
	 */
	public static function always_enqueue_assets() {
		return 'always' === (string) Repository::get( 'asset_loading', 'conditional' );
	}
}