<?php

/**
 * Event Manager API
 *
 * [Long Description.]
 *
 * @link https://carlalexander.ca/design-system-wordpress-event-management/
 * @since 4.0.0
 *
 * @package ItalyStrap
 */

declare(strict_types=1);

namespace ItalyStrap\Event;

/**
 * Class description
 */
class Manager
{
    public const CALLBACK = 'function_to_add';
    public const PRIORITY = 'priority';
    public const ACCEPTED_ARGS = 'accepted_args';

    /**
     * Adds an event subscriber.
     *
     * The event manager adds the given subscriber to the list of event listeners
     * for all the events that it wants to listen to.
     *
     * @param Subscriber_Interface $subscriber
     */
    public function add_subscriber(Subscriber_Interface $subscriber)
    {
        foreach ($subscriber->get_subscribed_events() as $event_name => $parameters) {
            $this->add_subscriber_listener($subscriber, $event_name, $parameters);
        }
    }

    /**
     * Adds the given subscriber listener to the list of event listeners
     * that listen to the given event.
     *
     * @param Subscriber_Interface $subscriber
     * @param string               $event_name
     * @param mixed                $parameters
     */
    private function add_subscriber_listener(Subscriber_Interface $subscriber, $event_name, $parameters)
    {
        if (\is_string($parameters)) {
            $this->add_listener($event_name, [$subscriber, $parameters]);
        } elseif (\is_array($parameters) && isset($parameters[ static::CALLBACK ])) {
            $this->add_listener(
                $event_name,
                [ $subscriber, $parameters[ static::CALLBACK ] ],
                $parameters[ static::PRIORITY ] ?? 10,
                $parameters[ static::ACCEPTED_ARGS ] ?? 1
            );
        }
    }

    /**
     * Adds the given event listener to the list of event listeners
     * that listen to the given event.
     *
     * @param string   $event_name
     * @param callable $listener
     * @param int      $priority
     * @param int      $accepted_args
     */
    public function add_listener($event_name, $listener, $priority = 10, $accepted_args = 1)
    {
        \add_filter($event_name, $listener, $priority, $accepted_args);
    }

    /**
     * Removes an event subscriber.
     *
     * The event manager removes the given subscriber from the list of event listeners
     * for all the events that it wants to listen to.
     *
     * @param Subscriber_Interface $subscriber
     */
    public function remove_subscriber(Subscriber_Interface $subscriber)
    {
        foreach ($subscriber->get_subscribed_events() as $event_name => $parameters) {
            $this->remove_subscriber_listener($subscriber, $event_name, $parameters);
        }
    }

    /**
     * Adds the given subscriber listener to the list of event listeners
     * that listen to the given event.
     *
     * @param Subscriber_Interface $subscriber
     * @param string               $event_name
     * @param mixed                $parameters
     */
    private function remove_subscriber_listener(Subscriber_Interface $subscriber, $event_name, $parameters)
    {
        if (is_string($parameters)) {
            $this->remove_listener($event_name, [$subscriber, $parameters]);
        } elseif (is_array($parameters) && isset($parameters[ static::CALLBACK ])) {
            $this->remove_listener(
                $event_name,
                [$subscriber, $parameters[ static::CALLBACK ]],
                $parameters[ static::PRIORITY ] ?? 10
            );
        }
    }

    /**
     * Removes the given event listener from the list of event listeners
     * that listen to the given event.
     *
     * @param string   $event_name
     * @param callable $listener
     * @param int      $priority
     */
    public function remove_listener($event_name, $listener, $priority = 10)
    {
        \remove_filter($event_name, $listener, $priority);
        // $this->plugin_api_manager->remove_callback( $event_name, $listener, $priority );
    }

    /**
     * Hard removing a method registerd by an anonimous object.
     *
     * From an idea of Tonia Mork of KnowTheCode
     * @link https://knowthecode.io/
     *
     * @example
     * $event_manager->hard_remove_subscriber( 'wp', 'schedule_events', 10 );
     *
     * @param  string $event_name    The event name.
     * @param  string $method_name   The method name callback to remove.
     * @param  int    $priority      The priority of the callback.
     * @param  int    $accepted_args The number of the accepted args.
     */
    public function hard_remove_subscriber($event_name, $method_name, $priority, $accepted_args = null)
    {

        global $wp_filter;

        if (! isset($wp_filter[ $event_name ][ $priority ])) {
            return;
        }

        foreach ((array) $wp_filter[ $event_name ][ $priority ] as $method_name_regstered => $value) {
            if (strpos($method_name_regstered, $method_name) !== false) {
                \remove_filter($event_name, $method_name_regstered, $priority);
            }
        }
    }
}