<?php

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

if ( ! class_exists( 'acf_loop' ) ) :

	class acf_loop {


		/*
		*  __construct
		*
		*  This function will setup the class functionality
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function __construct() {

			// vars
			$this->loops = array();

		}


		/*
		*  is_empty
		*
		*  This function will return true if no loops exist
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   n/a
		*  @return  (boolean)
		*/

		function is_empty() {

			return empty( $this->loops );

		}


		/*
		*  is_loop
		*
		*  This function will return true if a loop exists for the given array index
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $i (int)
		*  @return  (boolean)
		*/

		function is_loop( $i = 0 ) {

			return isset( $this->loops[ $i ] );

		}


		/*
		*  get_i
		*
		*  This function will return a valid array index for the given $i
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $i (mixed)
		*  @return  (int)
		*/

		function get_i( $i = 0 ) {

			// 'active'
			if ( $i === 'active' ) {
				$i = -1;
			}

			// 'previous'
			if ( $i === 'previous' ) {
				$i = -2;
			}

			// allow negative to look at end of loops
			if ( $i < 0 ) {

				$i = count( $this->loops ) + $i;

			}

			// return
			return $i;

		}


		/*
		*  add_loop
		*
		*  This function will add a new loop
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $loop (array)
		*  @return  n/a
		*/

		function add_loop( $loop = array() ) {

			// defaults
			$loop = wp_parse_args(
				$loop,
				array(
					'selector' => '',
					'name'     => '',
					'value'    => false,
					'field'    => false,
					'i'        => -1,
					'post_id'  => 0,
					'key'      => '',
				)
			);

			// ensure array
			$loop['value'] = acf_get_array( $loop['value'] );

			// Re-index values if this loop starts from index 0.
			// This allows ajax previews to work ($_POST data contains random unique array keys)
			if ( $loop['i'] == -1 ) {

				$loop['value'] = array_values( $loop['value'] );

			}

			// append
			$this->loops[] = $loop;

			// return
			return $loop;

		}


		/*
		*  update_loop
		*
		*  This function will update a loop's setting
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $i (mixed)
		*  @param   $key (string) the loop setting name
		*  @param   $value (mixed) the loop setting value
		*  @return  (boolean) true on success
		*/

		function update_loop( $i = 'active', $key = null, $value = null ) {

			// i
			$i = $this->get_i( $i );

			// bail early if no set
			if ( ! $this->is_loop( $i ) ) {
				return false;
			}

			// set
			$this->loops[ $i ][ $key ] = $value;

			// return
			return true;

		}


		/*
		*  get_loop
		*
		*  This function will return a loop, or loop's setting for a given index & key
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $i (mixed)
		*  @param   $key (string) the loop setting name
		*  @return  (mixed) false on failure
		*/

		function get_loop( $i = 'active', $key = null ) {

			// i
			$i = $this->get_i( $i );

			// bail early if no set
			if ( ! $this->is_loop( $i ) ) {
				return false;
			}

			// check for key
			if ( $key !== null ) {

				return $this->loops[ $i ][ $key ];

			}

			// return
			return $this->loops[ $i ];

		}


		/*
		*  remove_loop
		*
		*  This function will remove a loop
		*
		*  @type    function
		*  @date    3/03/2016
		*  @since   5.3.2
		*
		*  @param   $i (mixed)
		*  @return  (boolean) true on success
		*/

		function remove_loop( $i = 'active' ) {

			// i
			$i = $this->get_i( $i );

			// bail early if no set
			if ( ! $this->is_loop( $i ) ) {
				return false;
			}

			// remove
			unset( $this->loops[ $i ] );

			// reset keys
			$this->loops = array_values( $this->loops );

			// PHP 7.2 no longer resets array keys for empty value
			if ( $this->is_empty() ) {
				$this->loops = array();
			}
		}

	}

	// initialize
	acf()->loop = new acf_loop();

endif; // class_exists check



/*
*  acf_add_loop
*
*  alias of acf()->loop->add_loop()
*
*  @type    function
*  @date    6/10/13
*  @since   5.0.0
*
*  @param   n/a
*  @return  n/a
*/

function acf_add_loop( $loop = array() ) {

	return acf()->loop->add_loop( $loop );

}


/*
*  acf_update_loop
*
*  alias of acf()->loop->update_loop()
*
*  @type    function
*  @date    6/10/13
*  @since   5.0.0
*
*  @param   n/a
*  @return  n/a
*/

function acf_update_loop( $i = 'active', $key = null, $value = null ) {

	return acf()->loop->update_loop( $i, $key, $value );

}


/*
*  acf_get_loop
*
*  alias of acf()->loop->get_loop()
*
*  @type    function
*  @date    6/10/13
*  @since   5.0.0
*
*  @param   n/a
*  @return  n/a
*/

function acf_get_loop( $i = 'active', $key = null ) {

	return acf()->loop->get_loop( $i, $key );

}


/*
*  acf_remove_loop
*
*  alias of acf()->loop->remove_loop()
*
*  @type    function
*  @date    6/10/13
*  @since   5.0.0
*
*  @param   n/a
*  @return  n/a
*/

function acf_remove_loop( $i = 'active' ) {

	return acf()->loop->remove_loop( $i );

}


