<?php
/**
 * Hook registration class.
 *
 * Maintains lists of all hooks registered by the plugin and
 * registers them with WordPress when run() is called.
 *
 * @package Waitlytics
 */

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

/**
 * Class WTLY_Loader
 *
 * Central hook registration for Waitlytics.
 */
class WTLY_Loader {

	/**
	 * Array of actions registered with WordPress.
	 *
	 * @var array
	 */
	protected $actions;

	/**
	 * Array of filters registered with WordPress.
	 *
	 * @var array
	 */
	protected $filters;

	/**
	 * Initialize the collections used to maintain the actions and filters.
	 */
	public function __construct() {
		$this->actions = array();
		$this->filters = array();
	}

	/**
	 * Add a new action to the collection to be registered with WordPress.
	 *
	 * @param string $hook          The name of the WordPress action.
	 * @param object $component     A reference to the instance of the object on which the action is defined.
	 * @param string $callback      The name of the function defined on the $component.
	 * @param int    $priority      Optional. The priority at which the function should be fired. Default 10.
	 * @param int    $accepted_args Optional. The number of arguments that should be passed to the $callback. Default 1.
	 */
	public function add_action( $hook, $component, $callback, $priority = 10, $accepted_args = 1 ) {
		$this->actions = $this->add( $this->actions, $hook, $component, $callback, $priority, $accepted_args );
	}

	/**
	 * Add a new filter to the collection to be registered with WordPress.
	 *
	 * @param string $hook          The name of the WordPress filter.
	 * @param object $component     A reference to the instance of the object on which the filter is defined.
	 * @param string $callback      The name of the function defined on the $component.
	 * @param int    $priority      Optional. The priority at which the function should be fired. Default 10.
	 * @param int    $accepted_args Optional. The number of arguments that should be passed to the $callback. Default 1.
	 */
	public function add_filter( $hook, $component, $callback, $priority = 10, $accepted_args = 1 ) {
		$this->filters = $this->add( $this->filters, $hook, $component, $callback, $priority, $accepted_args );
	}

	/**
	 * Utility function to register the actions and hooks into a single collection.
	 *
	 * @param array  $hooks         The collection of hooks (actions or filters).
	 * @param string $hook          The name of the WordPress hook.
	 * @param object $component     A reference to the instance of the object.
	 * @param string $callback      The name of the function on the $component.
	 * @param int    $priority      The priority at which the function should be fired.
	 * @param int    $accepted_args The number of arguments passed to the $callback.
	 * @return array The collection of hooks with the new addition.
	 */
	private function add( $hooks, $hook, $component, $callback, $priority, $accepted_args ) {
		$hooks[] = array(
			'hook'          => $hook,
			'component'     => $component,
			'callback'      => $callback,
			'priority'      => $priority,
			'accepted_args' => $accepted_args,
		);

		return $hooks;
	}

	/**
	 * Register the filters and actions with WordPress.
	 */
	public function run() {
		foreach ( $this->filters as $hook ) {
			add_filter(
				$hook['hook'],
				array( $hook['component'], $hook['callback'] ),
				$hook['priority'],
				$hook['accepted_args']
			);
		}

		foreach ( $this->actions as $hook ) {
			add_action(
				$hook['hook'],
				array( $hook['component'], $hook['callback'] ),
				$hook['priority'],
				$hook['accepted_args']
			);
		}
	}
}
