<?php

namespace RoosterLMS\UI;

defined( 'ABSPATH' ) || exit;

final class BlockStyles {

	private const CHROME = array( 'rooster-lms/account-menu' );

	private const ON_INTENT = array( Assets::FRONT_ACCOUNT, Assets::FRONT_ACCOUNT_OPEN );

	private static array $needed = array();

	private static bool $front = false;

	public function register(): void {
		add_action( 'template_redirect', array( self::class, 'front' ) );
		add_filter( 'render_block', array( self::class, 'note' ), 10, 2 );
		add_action( 'wp_enqueue_scripts', array( self::class, 'queue_missing' ), PHP_INT_MAX );
		add_action( 'wp_footer', array( self::class, 'print_missing' ), 15 );
	}

	public static function front(): void {
		self::$front = true;
	}

	public static function note( $content, $block ) {
		$name = is_array( $block ) ? (string) ( $block['blockName'] ?? '' ) : '';
		if ( ! self::$front || ! str_starts_with( $name, 'rooster-lms/' ) || in_array( $name, self::CHROME, true ) ) {
			return $content;
		}
		foreach ( (array) wp_styles()->queue as $handle ) {
			$handle = (string) $handle;
			if ( str_starts_with( $handle, 'rooster-lms' ) && ! in_array( $handle, self::ON_INTENT, true ) ) {
				self::$needed[ $handle ] = true;
			}
		}
		return $content;
	}

	public static function queue_missing(): void {
		foreach ( self::missing() as $handle ) {
			wp_enqueue_style( $handle );
		}
	}

	public static function print_missing(): void {
		$missing = self::missing();
		if ( array() !== $missing ) {
			wp_styles()->do_items( $missing );
		}
	}

	public static function missing(): array {
		$styles = wp_styles();
		$out    = array();
		foreach ( array_keys( self::$needed ) as $handle ) {
			if ( isset( $styles->registered[ $handle ] ) && ! $styles->query( $handle, 'done' ) && ! $styles->query( $handle, 'enqueued' ) ) {
				$out[] = $handle;
			}
		}
		return $out;
	}

	public static function reset(): void {
		self::$needed = array();
		self::$front  = false;
	}
}