<?php
/**
 * Asset loading.
 *
 * @package HostKhata
 */

namespace HostKhata\Core;

defined( 'ABSPATH' ) || exit;

use HostKhata\Admin\CsvExport;
use HostKhata\Admin\Menu;
use HostKhata\Settings\Settings;

/**
 * Enqueues the compiled admin app, only on the HostKhata screen.
 *
 * @since 0.1.0
 */
final class Assets implements Hookable {

	/**
	 * Script and style handle of the admin app.
	 */
	const ADMIN_HANDLE = 'hostkhata-admin';

	/**
	 * Translations helper.
	 *
	 * @var I18n
	 */
	private $i18n;

	/**
	 * Settings.
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Constructor.
	 *
	 * @param I18n     $i18n     Translations helper.
	 * @param Settings $settings Settings.
	 */
	public function __construct( I18n $i18n, Settings $settings ) {
		$this->i18n     = $i18n;
		$this->settings = $settings;
	}

	/**
	 * {@inheritdoc}
	 */
	public function register(): void {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin' ) );
	}

	/**
	 * Tells whether the compiled admin bundle exists.
	 *
	 * @since 0.1.0
	 *
	 * @return bool
	 */
	public static function admin_build_exists(): bool {
		return is_readable( HOSTKHATA_PATH . 'assets/build/admin.js' )
			&& is_readable( HOSTKHATA_PATH . 'assets/build/admin.asset.php' );
	}

	/**
	 * Enqueues the admin app on the HostKhata screen.
	 *
	 * @since 0.1.0
	 *
	 * @param string $hook_suffix Current admin page hook suffix.
	 * @return void
	 */
	public function enqueue_admin( string $hook_suffix ): void {
		if ( ! Menu::is_app_screen( $hook_suffix ) || ! self::admin_build_exists() ) {
			return;
		}

		$asset = require HOSTKHATA_PATH . 'assets/build/admin.asset.php';

		wp_enqueue_script(
			self::ADMIN_HANDLE,
			HOSTKHATA_URL . 'assets/build/admin.js',
			$asset['dependencies'],
			$asset['version'],
			true
		);

		$this->i18n->set_script_translations( self::ADMIN_HANDLE );

		wp_add_inline_script(
			self::ADMIN_HANDLE,
			'window.hostkhataData = ' . wp_json_encode( $this->admin_data(), JSON_HEX_TAG | JSON_HEX_AMP ) . ';',
			'before'
		);

		if ( is_readable( HOSTKHATA_PATH . 'assets/build/admin.css' ) ) {
			wp_enqueue_style(
				self::ADMIN_HANDLE,
				HOSTKHATA_URL . 'assets/build/admin.css',
				array(),
				$asset['version']
			);
			wp_style_add_data( self::ADMIN_HANDLE, 'rtl', 'replace' );
		}
	}

	/**
	 * Data handed to the admin app.
	 *
	 * @return array<string, mixed>
	 */
	private function admin_data(): array {
		/**
		 * Filters the data exposed to the admin app as `window.hostkhataData`.
		 *
		 * @since 0.1.0
		 *
		 * @param array $data Bootstrap data.
		 */
		$can = array();

		foreach ( Capabilities::staff_caps() as $capability ) {
			$can[ $capability ] = current_user_can( $capability );
		}

		$exports = array();

		foreach ( CsvExport::kinds() as $kind => $capability ) {
			if ( current_user_can( $capability ) ) {
				$exports[ $kind ] = esc_url_raw( CsvExport::url( $kind ) );
			}
		}

		return apply_filters(
			'hostkhata_admin_app_data',
			array(
				'version'       => HOSTKHATA_VERSION,
				'restNamespace' => 'hostkhata/v1',
				'restUrl'       => esc_url_raw( rest_url( 'hostkhata/v1/' ) ),
				'appUrl'        => esc_url_raw( admin_url( 'admin.php?page=' . Menu::SLUG ) ),
				'debug'         => defined( 'WP_DEBUG' ) && WP_DEBUG,
				'can'           => $can,
				'exports'       => $exports,
				'settings'      => $this->settings->export_for_app(),
			)
		);
	}
}