<?php
namespace Akram;

defined( 'ABSPATH' ) || exit;

/**
 * Optional front-end clean-ups that make every page lighter.
 */
final class Performance {

	public static function init() {
		self::white_label();
		if ( is_admin() ) {
			return;
		}
		add_action( 'init', array( __CLASS__, 'apply' ), 1 );
		self::navigation();
	}

	/** White label: rename the plugin in menus, notices and admin strings. */
	private static function white_label() {
		$brand = trim( (string) Options::get( 'brand_name', '' ) );
		if ( '' === $brand ) {
			return;
		}
		add_filter(
			'gettext_akram',
			static function ( $text ) use ( $brand ) {
				return str_replace( array( 'Akram', 'Akram' ), $brand, $text );
			}
		);
	}

	/**
	 * Instant navigation: prefetch likely next pages (Speculation Rules) and animate
	 * same-origin page changes with cross-document View Transitions. Both are progressive
	 * enhancements: browsers without support simply navigate normally.
	 */
	private static function navigation() {
		$mode = (string) Options::get( 'prefetch', 'moderate' );
		if ( function_exists( 'wp_get_speculation_rules_configuration' ) ) {
			add_filter(
				'wp_speculation_rules_configuration',
				static function ( $config ) use ( $mode ) {
					if ( 'off' === $mode ) {
						return null;
					}
					if ( null === $config || is_user_logged_in() || Editor::canvas_id() ) {
						return $config; // keep core's defaults (no prefetching for logged-in users)
					}
					return array(
						'mode'      => 'prefetch',
						'eagerness' => in_array( $mode, array( 'conservative', 'moderate', 'eager' ), true ) ? $mode : 'moderate',
					);
				}
			);
		} elseif ( 'off' !== $mode ) {
			add_action(
				'wp_footer',
				static function () use ( $mode ) {
					if ( is_user_logged_in() ) {
						return;
					}
					$path  = wp_parse_url( home_url( '/' ), PHP_URL_PATH ) ?: '/';
					$rules = array(
						'prefetch' => array(
							array(
								'source'    => 'document',
								'where'     => array(
									'and' => array(
										array( 'href_matches' => $path . '*' ),
										array( 'not' => array( 'href_matches' => array( '/wp-*.php', '/wp-admin/*', '/*\\?(.+)', '/cart/*', '/checkout/*', '/my-account/*' ) ) ),
										array( 'not' => array( 'selector_matches' => 'a[rel~="nofollow"],.no-prefetch,.no-prefetch a' ) ),
									),
								),
								'eagerness' => in_array( $mode, array( 'conservative', 'moderate', 'eager' ), true ) ? $mode : 'moderate',
							),
						),
					);
					wp_print_inline_script_tag( wp_json_encode( $rules, JSON_UNESCAPED_SLASHES ), array( 'type' => 'speculationrules' ) );
				}
			);
		}
		add_action(
			'wp_enqueue_scripts',
			static function () {
				$css = '';
				if ( Editor::canvas_id() || is_customize_preview() ) {
					return; // never inside the editor canvas or customizer previews
				}
				if ( Options::get( 'view_transitions', true ) ) {
					$css .= '@media (prefers-reduced-motion:no-preference){@view-transition{navigation:auto}::view-transition-old(root),::view-transition-new(root){animation-duration:.22s}}';
				}
				if ( Options::get( 'smooth_scroll', false ) ) {
					$css .= '@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}html{scroll-padding-top:var(--nx-sticky-h,0px)}';
				}
				$pre = (string) Options::get( 'preloader', 'none' );
				if ( $css ) {
					wp_register_style( 'akram-nav', false, array(), AKRAM_VERSION );
					wp_enqueue_style( 'akram-nav' );
					wp_add_inline_style( 'akram-nav', $css );
				}
				if ( 'none' !== $pre ) {
					wp_enqueue_style( 'akram-preloader', AKRAM_URL . 'assets/css/preloader.css', array(), AKRAM_VERSION );
					// Hides the preloader once the page has loaded (or after 2.5 s at most).
					wp_enqueue_script( 'akram-preloader', AKRAM_URL . 'assets/js/preloader.js', array(), AKRAM_VERSION, true );
				}
			}
		);
		if ( 'none' !== Options::get( 'preloader', 'none' ) ) {
			add_action(
				'wp_body_open',
				static function () {
					if ( Editor::canvas_id() ) {
						return;
					}
					$pre   = (string) Options::get( 'preloader', 'none' );
					$inner = '<i></i>';
					if ( 'logo' === $pre && get_theme_mod( 'custom_logo' ) ) {
						$inner = wp_get_attachment_image( (int) get_theme_mod( 'custom_logo' ), 'medium', false, array(
							'alt'     => '',
							'loading' => 'eager',
						) );
					}
					echo '<div id="nx-pre" class="is-' . esc_attr( $pre ) . '" aria-hidden="true">' . wp_kses_post( $inner ) . '</div>';
				},
				1
			);
		}
	}

	public static function apply() {
		if ( Options::get( 'disable_emojis' ) ) {
			remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
			remove_action( 'wp_print_styles', 'print_emoji_styles' );
			remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
			remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
			remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
			add_filter( 'emoji_svg_url', '__return_false' );
		}
		if ( Options::get( 'disable_embeds' ) ) {
			remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );
			remove_action( 'wp_head', 'wp_oembed_add_host_js' );
			add_action( 'wp_footer', static function () {
				wp_dequeue_script( 'wp-embed' );
			} );
		}
		if ( Options::get( 'disable_dashicons' ) ) {
			add_action( 'wp_enqueue_scripts', static function () {
				if ( ! is_user_logged_in() ) {
					wp_dequeue_style( 'dashicons' );
				}
			}, 100 );
		}
		if ( ! Options::get( 'jquery_migrate' ) ) {
			add_action( 'wp_default_scripts', static function ( $scripts ) {
				if ( ! is_admin() && isset( $scripts->registered['jquery'] ) ) {
					$scripts->registered['jquery']->deps = array_diff( $scripts->registered['jquery']->deps, array( 'jquery-migrate' ) );
				}
			} );
		}
	}
}