<?php
/**
 * WP Admin Class
 * conditionally loads classes for WP Admin.
 *
 * @author   Paul Kilmurray <paul@kilbot.com.au>
 *
 * @see     http://www.wcpos.com
 * @package WCPOS\WooCommercePOS
 */

namespace WCPOS\WooCommercePOS;

use Automattic\WooCommerce\Admin\PageController;
use WCPOS\WooCommercePOS\Admin\Analytics;
use WCPOS\WooCommercePOS\Admin\Notices;
use WCPOS\WooCommercePOS\Admin\Orders\HPOS_List_Orders;
use WCPOS\WooCommercePOS\Admin\Orders\HPOS_Single_Order;
use WCPOS\WooCommercePOS\Admin\Orders\List_Orders;
use WCPOS\WooCommercePOS\Admin\Orders\Single_Order;
use WCPOS\WooCommercePOS\Admin\Permalink;
use WCPOS\WooCommercePOS\Admin\Plugins;
use WCPOS\WooCommercePOS\Admin\Products\List_Products;
use WCPOS\WooCommercePOS\Admin\Products\Single_Product;
use WCPOS\WooCommercePOS\Admin\Settings;
use WCPOS\WooCommercePOS\Admin\Templates\Single_Template;
use WP_Screen;

/**
 * Admin class.
 */
class Admin {
	/**
	 * Script handle for the api-fetch `_method` shim (assets/js/api-fetch-method-param.js).
	 *
	 * Pro references this handle by its string value, guarded by
	 * wp_script_is( ..., 'registered' ), so the value is a compatibility contract.
	 */
	public const API_FETCH_METHOD_PARAM_HANDLE = 'wcpos-api-fetch-method-param';

	/**
	 * POS Menu IDs.
	 *
	 * @var string[] Unique menu identifier.
	 */
	private $menu_ids = array();

	/**
	 * Registered screen handlers.
	 *
	 * @var array
	 */
	private $screen_handlers = array();

	/**
	 * Constructor.
	 *
	 * NOTE: WordPress fires the admin_menu hook before the admin_init.
	 * 1. admin_menu
	 * 2. admin_init
	 * 3. current_screen
	 *
	 * We need admin_menu at priority 5 so that we can hook the Analytics menu before WooCommerce.
	 */
	public function __construct() {
		add_action( 'admin_menu', array( $this, 'admin_menu' ), 5 );
		add_action( 'admin_init', array( $this, 'init' ) );
		add_action( 'admin_init', array( $this, 'register_scripts' ) );
		add_action( 'current_screen', array( $this, 'current_screen' ) );

		// register the screen handlers.
		$this->screen_handlers = array(
			'options-permalink'          => Permalink::class,
			'product'                    => Single_Product::class,
			'edit-product'               => List_Products::class,
			'shop_order'                 => Single_Order::class,
			'edit-shop_order'            => List_Orders::class,
			'plugins'                    => Plugins::class,
			'wcpos_template'             => Single_Template::class,
			'woocommerce_page_wc-orders' => array( $this, 'handle_wc_hpos_orders_screen' ),
			'woocommerce_page_wc-admin'  => array( $this, 'handle_wc_analytics_screen' ),
		);
	}

	/**
	 * Load admin subclasses.
	 */
	public function init(): void {
		new Notices();
	}

	/**
	 * Register the shared admin scripts that WCPOS bundles depend on.
	 *
	 * The api-fetch shim routes PUT/PATCH/DELETE through POST + `?_method=`
	 * so wp-admin mutations survive hosts that 403 the bare verbs or the
	 * `X-HTTP-Method-Override` header (see the shim's header comment). It is
	 * only registered here; each bundle that uses `wp.apiFetch` enqueues it
	 * by listing self::API_FETCH_METHOD_PARAM_HANDLE as a dependency.
	 */
	public function register_scripts(): void {
		wp_register_script(
			self::API_FETCH_METHOD_PARAM_HANDLE,
			PLUGIN_URL . 'assets/js/api-fetch-method-param.js',
			array( 'wp-api-fetch' ),
			VERSION,
			true
		);
	}

	/**
	 * Fires before the administration menu loads in the admin.
	 */
	public function admin_menu(): void {
		$menu           = new Admin\Menu();
		$this->menu_ids = array(
			'toplevel' => $menu->toplevel_screen_id,
			'settings' => $menu->settings_screen_id,
		);

		// Add the settings screen using the WCPOS menu ID.
		$this->screen_handlers[ $this->menu_ids['settings'] ] = Settings::class;
	}

	/**
	 * Conditionally load subclasses based on admin screen.
	 *
	 * @param WP_Screen $current_screen Current screen object.
	 */
	public function current_screen( $current_screen ): void {
		/*
		 * Backwards compatibility for WCPOS Pro 1.4.2 and below.
		 * DO NOT USE THIS!
		 *
		 * @TODO: Remove in WCPOS 2.0.0.
		 */
		$this->screen_handlers['product'] = apply_filters( 'woocommerce_pos_single_product_admin_class', Single_Product::class );

		/**
		 * Filters the screen handlers for WCPOS admin screens.
		 *
		 * @hook woocommerce_pos_admin_screen_handlers
		 *
		 * @since 1.4.10
		 *
		 * @param array     $handlers       Associative array of screen IDs and their corresponding handlers.
		 *                                  Handler can be a class name or a callback array.
		 * @param WP_Screen $current_screen The current WP_Screen object being loaded in the admin.
		 */
		$handlers = apply_filters( 'woocommerce_pos_admin_screen_handlers', $this->screen_handlers, $current_screen );

		// Check if the current screen has a handler.
		if ( isset( $handlers[ $current_screen->id ] ) ) {
			$handler = $handlers[ $current_screen->id ];

			if ( \is_array( $handler ) && method_exists( $handler[0], $handler[1] ) ) {
				\call_user_func( $handler );
			} elseif ( class_exists( $handler ) ) {
				new $handler();
			}
		}
	}

	/**
	 * Handle WooCommerce HPOS orders screen.
	 */
	public function handle_wc_hpos_orders_screen(): void {
		if ( isset( $_GET['action'] ) && 'edit' === $_GET['action'] ) {
			new HPOS_Single_Order();
		} else {
			new HPOS_List_Orders();
		}
	}

	/**
	 * Handle WooCommerce analytics screen.
	 */
	public function handle_wc_analytics_screen(): void {
		if ( class_exists( '\Automattic\WooCommerce\Admin\PageController' ) ) {
			$wc_admin_page_controller = PageController::get_instance();
			if ( $wc_admin_page_controller ) {
				$wc_admin_current_page    = $wc_admin_page_controller->get_current_page();
				$id                       = $wc_admin_current_page['id'] ?? null;
				$parent                   = $wc_admin_current_page['parent'] ?? null;

				if ( 'woocommerce-analytics' === $id || 'woocommerce-analytics' === $parent ) {
					new Analytics();
				}
			}
		}
	}
}