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<?php
/**
 * WP Currencies ACF 4 currency field
 *
 * Support for Advanced Custom Fields version 4.x
 *
 * @package WP_Currencies\ACF
 */

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

/**
 * Class WP Currencies ACF v4
 *
 * Extends ACF 4.x with a Currency field.
 *
 * @since 1.1.0
 */
class WP_Currency_ACF_v4 extends acf_field {

	/**
	 * Field settings.
	 *
	 * @since 1.1.0
	 * @access public
	 * @var array
	 */
	public $settings;

	/**
	 * Field defaults.
	 *
	 * @since 1.1.0
	 * @access public
	 * @var array
	 */
	public $defaults;

	/**
	 * Setup field data.
	 *
	 * @since 1.1.0
	 */
	public function __construct() {

		// Field basic properties.
		$this->name     = 'currency';
		$this->label    = __( 'Currency', 'wp_currencies' );
		$this->category = __( "Choice", 'acf' );

		// Field default values.
		$this->defaults = array(
			'multiple' 		=>	0,		// disallow for multiple selection
			'allow_null' 	=>	0,		// disallow null choice
			'default_value'	=>	'USD'	// set US Dollar as default currency
		);

		// Leave this here (ACF API).
		parent::__construct();

		// Field settings.
		$this->settings = array(
			'path'    => apply_filters('acf/helpers/get_path', __FILE__),
			'dir'     => apply_filters('acf/helpers/get_dir', __FILE__),
			'version' => WP_CURRENCIES_VERSION
		);

	}

	/**
	 * Create field options.
	 *
	 * Create extra options for your field. This is rendered when editing a field.
	 *
	 * @param array $field An array holding all the field's data.
	 */
	public function create_options( $field ) {

		$key = $field['name'];

		?>
		<tr class="field_option field_option_<?php echo $this->name; ?>">
			<td class="label">
				<label><?php _e( "Default Value", 'acf' ); ?></label>
				<p class="description"><?php _e( "Choose a default value", 'acf' ); ?></p>
			</td>
			<td>
				<?php do_action( 'acf/create_field', array(
					'type'	=>  'currency',
					'name'	=>	'fields[' . $key . '][default_value]',
					'value'	=>	$field['default_value'],
					'allow_null' => 1,
				)); ?>
			</td>
		</tr>
		<tr class="field_option field_option_<?php echo $this->name; ?>">
			<td class="label">
				<label><?php _e( "Allow Null?", 'acf' ); ?></label>
			</td>
			<td>
				<?php
				do_action( 'acf/create_field', array(
					'type'	=>	'radio',
					'name'	=>	'fields[' . $key . '][allow_null]',
					'value'	=>	$field['allow_null'],
					'choices'	=>	array(
						1	=>	__( "Yes", 'acf' ),
						0	=>	__( "No", 'acf' ),
					),
					'layout'	=>	'horizontal',
				));
				?>
			</td>
		</tr>
		<tr class="field_option field_option_<?php echo $this->name; ?>">
			<td class="label">
				<label><?php _e( "Select multiple values?", 'acf' ); ?></label>
			</td>
			<td>
				<?php
				do_action( 'acf/create_field', array(
					'type'	=>	'radio',
					'name'	=>	'fields[' . $key . '][multiple]',
					'value'	=>	$field['multiple'],
					'choices'	=>	array(
						1	=>	__( "Yes", 'acf' ),
						0	=>	__( "No", 'acf' ),
					),
					'layout'	=>	'horizontal',
				));
				?>
			</td>
		</tr>
		<?php

	}

	/**
	 * Create field.
	 *
	 * Creates the HTML interface for the Currency field.
	 *
	 * @since 1.1.0
	 *
	 * @param  array $field	an array holding all the field's data
	 */
	public function create_field( $field ) {

		// value must be array
		if( !is_array( $field['value'] ) ) {
			// perhaps this is a default value with new lines in it?
			if( strpos( $field['value'], "\n") !== false ) {
				// found multiple lines, explode it
				$field['value'] = explode("\n", $field['value']);
			} else {
				$field['value'] = array( $field['value'] );
			}
		}
		// trim value
		$field['value'] = array_map( 'trim', $field['value'] );

		// multiple select
		$multiple = '';
		if ( $field['multiple'] ) {
			// create a hidden field to allow for no selections
			echo '<input type="hidden" name="' . $field['name'] . '" />';

			$multiple = ' multiple="multiple" size="5" ';
			$field['name'] .= '[]';
		}

		echo '<select id="' . $field['id'] . '" class="select" name="' . $field['name'] . '" ' . $multiple . '>';

			// null option
			if ( $field['allow_null'] ) {
				echo '<option value="null">- ' . __( "Select", 'acf' ) . ' -</option>';
			}

			// get currencies via WP Currencies
			$currencies = get_currencies();

			// print options
			foreach( $currencies as $currency => $data ) :

				$data = (array) $data;
				$selected = in_array($currency, $field['value']) ? 'selected="selected"' : '';
				echo '<option value="' . $currency . '" ' . $selected . '>' . $currency . ' ' . $data['name'] . '</option>' . "\n";

			endforeach;

		echo '</select>';

	}


	/**
	 * Format value for API.
	 *
	 * This filter is applied to the $value after it is loaded from the db and before it is passed back to the API functions such as the_field.
	 *
	 * @since 1.1.0
	 *
	 * @param  mixed $value	  The value which was loaded from the database.
	 * @param  int	 $post_id The $post_id from which the value was loaded.
	 * @param  array $field   The field array holding all the field options.
	 *
	 * @return mixed $value The modified value.
	 */
	function format_value_for_api( $value, $post_id, $field ) {

		$currency = '';

		if ( $value == 'null' || $value == '' || $value == false ) :
			$currency = false;
		else :
			if ( is_array( $value ) ) {
				foreach ( $value as $code ) :
					$currency[$code] = get_currency( $code );
				endforeach;
			} else {
				$currency[$value] = get_currency( $value );
			}
		endif;

		return $currency;
	}

}

// create field
new WP_Currency_ACF_v4();