<?php
/**
 * Admin asset registration and enqueueing.
 *
 * @package ZeroSpamForms
 */

namespace TwoOTwoCode\ZeroSpamForms\Core\Assets;

defined( 'ABSPATH' ) || exit;

/**
 * Registers and enqueues admin assets only for plugin admin pages.
 */
final class AdminAssetManager {
	/**
	 * Admin stylesheet handle.
	 */
	private const STYLE_HANDLE = 'twootwocode-zsf-admin';

	/**
	 * Enqueue admin assets for the 2o2code Spamless Forms settings page.
	 */
	public function enqueue(): void {
		if ( ! function_exists( 'wp_register_style' ) || ! function_exists( 'wp_enqueue_style' ) ) {
			return;
		}

		wp_register_style(
			self::STYLE_HANDLE,
			$this->get_asset_url( 'assets/admin/settings.css' ),
			array(),
			$this->get_version()
		);

		wp_enqueue_style( self::STYLE_HANDLE );
	}

	/**
	 * Build a plugin asset URL.
	 *
	 * @param string $relative_path Relative asset path.
	 */
	private function get_asset_url( string $relative_path ): string {
		if ( ! defined( 'TWOOTWOCODE_ZSF_URL' ) ) {
			return '';
		}

		return TWOOTWOCODE_ZSF_URL . ltrim( $relative_path, '/' );
	}

	/**
	 * Get the current plugin version.
	 */
	private function get_version(): string {
		if ( defined( 'TWOOTWOCODE_ZSF_VERSION' ) ) {
			return TWOOTWOCODE_ZSF_VERSION;
		}

		return '1.0.0';
	}
}