<?php

namespace ADP\HighLander;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

class CallBackDetails {
	const TYPE_UNKNOWN = 0;
	const TYPE_COMPLETE = 1;
	const TYPE_FUNCTION = 2;
	const TYPE_CLOSURE = 3;

	/**
	 * @var callable
	 */
	protected $function;

	/**
	 * @var int
	 */
	protected $type;

	/**
	 * @param array $callbackDetails
	 */
	public function __construct( $callbackDetails ) {
		$this->type  = self::TYPE_UNKNOWN;
		$this->parse( $callbackDetails );
	}

	/**
	 * @param array $callbackDetails
	 */
	private function parse( $callbackDetails ) {
		if ( ! isset( $callbackDetails['function'] ) ) {
			return;
		}

		$function = $callbackDetails['function'];

		if ( $function instanceof \Closure ) {
			$this->function = $function;
			$this->type     = self::TYPE_CLOSURE;

			return;
		}

		if ( is_array( $function ) ) {
			$callbackObj  = $function[0];
			$callbackFunc = $function[1];
		} elseif ( is_string( $function ) ) {
			$callbackObj  = '';
			$callbackFunc = $function;
		} else {
			return;
		}

		if ( is_object( $callbackObj ) ) {
			$callbackClass = get_class( $callbackObj );
		} elseif ( is_string( $callbackObj ) && class_exists( $callbackObj ) ) {
			$callbackClass = $callbackObj;
		} else {
			$callbackClass = null;
		}

		if ( isset( $callbackClass ) ) {
			$this->function   = array( $callbackClass, $callbackFunc );
			$this->type       = self::TYPE_COMPLETE;
		} else {
			$this->function = $callbackFunc;
			$this->type     = self::TYPE_FUNCTION;
		}
	}

	/**
	 * @return int
	 */
	public function getType() {
		return $this->type;
	}

	/**
	 * @param int $type
	 *
	 * @return bool
	 */
	public function isType( $type ) {
		return $this->type === $type;
	}

	/**
	 * @return string|null
	 */
	public function maybeGetClassName() {
		if ( $this->type !== self::TYPE_COMPLETE ) {
			return null;
		}

		list( $className, $methodName ) = $this->function;

		return $className;
	}

	/**
	 * @return string|null
	 */
	public function maybeGetClassMethodName() {
		if ( $this->type !== self::TYPE_COMPLETE ) {
			return null;
		}

		list( $className, $methodName ) = $this->function;

		return $methodName;
	}

	/**
	 * @return string|null
	 */
	public function maybeGetFuncName() {
		if ( $this->type !== self::TYPE_FUNCTION ) {
			return null;
		}

		return $this->function;
	}

	public function maybeGetClosure() {
		if ( $this->type !== self::TYPE_CLOSURE ) {
			return null;
		}

		return $this->function;
	}

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

}