<?php
/**
 * Plugin singleton: loads the pieces and wires them together.
 *
 * @package kasp
 */

defined( 'ABSPATH' ) || exit;

/**
 * Central wiring for the helpo plugin.
 */
final class Kasp_Plugin {

	/**
	 * Singleton instance.
	 *
	 * @var Kasp_Plugin|null
	 */
	private static $instance = null;

	/**
	 * API client.
	 *
	 * @var Kasp_Api_Client
	 */
	public $api;

	/**
	 * Connect handshake handler.
	 *
	 * @var Kasp_Connect
	 */
	public $connect;

	/**
	 * WP REST proxy for the admin app.
	 *
	 * @var Kasp_Rest
	 */
	public $rest;

	/**
	 * Front-end embed.
	 *
	 * @var Kasp_Embed
	 */
	public $embed;

	/**
	 * Knowledge base sync.
	 *
	 * @var Kasp_Sync
	 */
	public $sync;

	/**
	 * wp-admin screens.
	 *
	 * @var Kasp_Admin
	 */
	public $admin;

	/**
	 * WooCommerce storefront buttons.
	 *
	 * @var Kasp_Store_Placements
	 */
	public $placements;

	/**
	 * Help center block.
	 *
	 * @var Kasp_Help_Center
	 */
	public $help_center;

	/**
	 * Accessor.
	 *
	 * @return Kasp_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Constructor. Private — use instance().
	 */
	private function __construct() {
		$this->includes();
		$this->init();
	}

	/**
	 * Load class files.
	 *
	 * @return void
	 */
	private function includes() {
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-settings.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-api-client.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-connect.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-woo.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-front-i18n.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-store-placements.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-help-center.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-sync.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-rest.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-embed.php';
		require_once KASP_PLUGIN_DIR . 'includes/class-kasp-admin.php';
	}

	/**
	 * Instantiate components and register their hooks.
	 *
	 * @return void
	 */
	private function init() {
		$this->api     = new Kasp_Api_Client();
		$this->connect = new Kasp_Connect( $this->api );
		$this->sync    = new Kasp_Sync( $this->api );
		$this->rest    = new Kasp_Rest( $this->api, $this->sync, $this->connect );
		$this->embed   = new Kasp_Embed();
		$this->admin   = new Kasp_Admin();

		$this->placements  = new Kasp_Store_Placements( $this->embed );
		$this->help_center = new Kasp_Help_Center( $this->api, $this->embed );
		$this->placements->register();
		$this->help_center->register();

		$this->connect->register();
		$this->sync->register();
		$this->rest->register();
		$this->embed->register();
		$this->admin->register();

	}

	// Translations: WordPress >= 4.6 loads them itself for the `helpo` text
	// domain from the plugin directory's language packs, so there is no
	// load_plugin_textdomain() call (the plugin directory flags it as
	// discouraged). languages/helpo.pot is the template translators start from.
}