<?php
/**
 * Plugin orchestrator.
 *
 * @package ElevenRank
 * @since   1.0.0
 */

namespace ElevenRank;

use ElevenRank\Admin\Admin_Module;
use ElevenRank\Modules\Analysis\Analysis_Module;
use ElevenRank\Modules\Breadcrumbs\Breadcrumbs_Module;
use ElevenRank\Modules\Images\Images_Module;
use ElevenRank\Modules\Import\Import_Module;
use ElevenRank\Modules\Meta\Meta_Module;
use ElevenRank\Modules\Monitor404\Monitor404_Module;
use ElevenRank\Modules\Redirects\Redirects_Module;
use ElevenRank\Modules\Robots\Robots_Module;
use ElevenRank\Modules\Schema\Schema_Module;
use ElevenRank\Modules\Settings\Settings_Module;
use ElevenRank\Modules\Sitemap\Sitemap_Module;
use ElevenRank\Modules\Tools\Tools_Module;

defined( 'ABSPATH' ) || exit;

/**
 * Wires the plugin together. Nothing runs at file load; everything starts in boot().
 *
 * @since 1.0.0
 */
final class Plugin {

	/**
	 * The single booted instance.
	 *
	 * @since 1.0.0
	 *
	 * @var Plugin|null
	 */
	private static $instance = null;

	/**
	 * Settings store.
	 *
	 * @since 1.0.0
	 *
	 * @var Settings
	 */
	private $settings;

	/**
	 * Capability definitions and fallbacks.
	 *
	 * @since 1.0.0
	 *
	 * @var Capabilities
	 */
	private $capabilities;

	/**
	 * Module registry.
	 *
	 * @since 1.0.0
	 *
	 * @var Module_Registry
	 */
	private $registry;

	/**
	 * Version bookkeeping and migrations.
	 *
	 * @since 1.0.0
	 *
	 * @var Upgrader
	 */
	private $upgrader;

	/**
	 * Boots the plugin once. Hooked to `plugins_loaded`.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	public static function boot(): void {
		if ( null !== self::$instance ) {
			return;
		}

		self::$instance = new self();
		self::$instance->run();
	}

	/**
	 * Builds the object graph. Constructors are free of side effects.
	 *
	 * @since 1.0.0
	 */
	private function __construct() {
		$this->settings     = new Settings();
		$this->capabilities = new Capabilities();
		$this->registry     = new Module_Registry( $this->settings );
		$this->upgrader     = new Upgrader();
	}

	/**
	 * Registers hooks, registers and boots the modules.
	 *
	 * @since 1.0.0
	 *
	 * @return void
	 */
	private function run(): void {
		add_action( 'init', array( $this->settings, 'register' ) );
		add_action( 'init', array( $this->upgrader, 'maybe_upgrade' ), 5 );

		require_once __DIR__ . '/template-functions.php';

		$this->capabilities->hooks();
		( new Rewrite_Rules( $this->settings ) )->hooks();

		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			\WP_CLI::add_command( 'elevenrank', new CLI\Root_Command() );
		}

		$gate = new Output_Gate( $this->settings, new Conflicts() );

		$this->registry->register( new Settings_Module( $this->settings, $gate ), true );
		$this->registry->register( new Meta_Module( $this->settings, $gate ), true );
		$this->registry->register( new Import_Module( $this->settings ), true );
		$this->registry->register( new Analysis_Module( $this->settings ) );
		$this->registry->register( new Sitemap_Module( $this->settings, $gate ) );
		$this->registry->register( new Robots_Module( $this->settings, $gate ) );
		$this->registry->register( new Breadcrumbs_Module( $this->settings ) );
		$this->registry->register( new Images_Module( $this->settings, $gate ) );
		$this->registry->register( new Schema_Module( $this->settings, $gate ) );
		$this->registry->register( new Redirects_Module( $this->settings, $gate ) );
		$this->registry->register( new Monitor404_Module( $this->settings, $gate ) );
		$this->registry->register( new Tools_Module( $this->settings, $gate, $this->registry ), true );
		$this->registry->register( new Admin_Module( $gate, $this->registry ), true );

		/**
		 * Lets add-ons register their own modules before any module boots.
		 *
		 * @since 1.0.0
		 *
		 * @param Module_Registry $registry The module registry.
		 */
		do_action( 'elevenrank_register_modules', $this->registry );

		$this->registry->boot();

		/**
		 * Fires once ElevenRank and all active modules are booted.
		 *
		 * @since 1.0.0
		 */
		do_action( 'elevenrank_loaded' );
	}
}