<?php

namespace AIBP;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-settings.php';
require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-debug-history.php';
require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-api-client.php';
require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-sync-service.php';
require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-scheduler.php';
require_once AIBP_PLUGIN_DIR . 'includes/class-aibp-admin.php';

/**
 * Wires all plugin services together and registers WordPress hooks.
 *
 * @package AI_Blog_Poster
 */
class Plugin {

	/**
	 * @var Plugin|null
	 */
	private static $instance = null;

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

	/**
	 * @var Debug_History
	 */
	private $debug_history;

	/**
	 * @var API_Client
	 */
	private $api_client;

	/**
	 * @var Sync_Service
	 */
	private $sync_service;

	/**
	 * @var Scheduler
	 */
	private $scheduler;

	/**
	 * @var Admin|null
	 */
	private $admin;

	/**
	 * Returns the shared plugin instance.
	 *
	 * @return Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Builds plugin services and registers WordPress hooks.
	 */
	private function __construct() {
		$this->settings      = new Settings();
		$this->debug_history = new Debug_History();
		$this->api_client    = new API_Client( $this->settings );
		$this->sync_service  = new Sync_Service( $this->settings, $this->api_client, $this->debug_history );
		$this->scheduler     = new Scheduler( $this->settings, $this->sync_service );
		$this->admin         = null;


		// Admin UI is only needed in the WordPress back-end.
		if ( is_admin() ) {
			$this->admin = new Admin( $this->settings, $this->sync_service, $this->scheduler, $this->debug_history );
		}
	}

	/**
	 * Runs on plugin activation. Called statically from the main plugin file.
	 *
	 * @return void
	 */
	public static function activate() {
		$settings     = new Settings();
		$settings->set_defaults();

		$debug_history = new Debug_History();
		$api_client    = new API_Client( $settings );
		$sync_service  = new Sync_Service( $settings, $api_client, $debug_history );
		$scheduler     = new Scheduler( $settings, $sync_service );
		$scheduler->register_schedule();
	}

	/**
	 * Runs on plugin deactivation. Called statically from the main plugin file.
	 *
	 * @return void
	 */
	public static function deactivate() {
		$settings      = new Settings();
		$debug_history = new Debug_History();
		$api_client    = new API_Client( $settings );
		$sync_service  = new Sync_Service( $settings, $api_client, $debug_history );
		$scheduler     = new Scheduler( $settings, $sync_service );
		$scheduler->clear_schedule();
	}
}