<?php
/**
 * WPTheMoon Addon Manager
 */

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

class WPTheMoon_Addon_Manager {

	private $addons = array();

	private $loaded_addons = array();

	private $errors = array();

	public function register( $addon ) {
		if ( ! $addon instanceof WPTheMoon_Addon_Interface ) {
			return new WP_Error( 'invalid_addon', __( 'Addon must implement WPTheMoon_Addon_Interface.', 'wpthemoon' ) );
		}

		$addon_id = sanitize_key( $addon->get_id() );

		if ( empty( $addon_id ) ) {
			return new WP_Error( 'invalid_addon_id', __( 'Addon ID is required.', 'wpthemoon' ) );
		}

		if ( isset( $this->addons[ $addon_id ] ) ) {
			return new WP_Error( 'duplicate_addon', __( 'Addon is already registered.', 'wpthemoon' ) );
		}

		$this->addons[ $addon_id ] = $addon;

		return true;
	}

	public function boot_available_addons() {
		foreach ( $this->addons as $addon_id => $addon ) {
			if ( ! $this->is_addon_available( $addon_id ) ) {
				continue;
			}

			try {
				$addon->boot();
				$this->loaded_addons[ $addon_id ] = true;

				do_action( 'wpthemoon_addon_loaded', $addon_id, $addon );
			} catch ( Throwable $exception ) {
				$this->errors[ $addon_id ] = $exception->getMessage();
			}
		}
	}

	public function get_addons() {
		return $this->addons;
	}

	public function get_addon( $addon_id ) {
		$addon_id = sanitize_key( $addon_id );

		return isset( $this->addons[ $addon_id ] ) ? $this->addons[ $addon_id ] : null;
	}

	public function is_addon_loaded( $addon_id ) {
		$addon_id = sanitize_key( $addon_id );

		return ! empty( $this->loaded_addons[ $addon_id ] );
	}

	public function is_addon_available( $addon_id ) {
		$addon = $this->get_addon( $addon_id );

		if ( ! $addon ) {
			return false;
		}

		return (bool) $addon->is_available();
	}

	public function get_addon_error( $addon_id ) {
		$addon_id = sanitize_key( $addon_id );

		return isset( $this->errors[ $addon_id ] ) ? $this->errors[ $addon_id ] : '';
	}
}