<?php
/**
 * ACF 5 Field Class
 *
 * This file holds the class required for our field to work with ACF 5
 *
 * @author Daniel Pataki
 * @since 3.0.0
 *
 */

/**
 * ACF 5 Taxonomy Selector Class
 *
 * The taxonomy selector class enables users to select terms and taxonomies.
 * This is the class that is used for ACF 5.
 *
 * @author Daniel Pataki
 * @since 3.0.0
 *
 */

class acf_field_advanced_taxonomy_selector extends acf_field {


	/**
	 * Field Constructor
	 *
	 * Sets basic properties and runs the parent constructor
	 *
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function __construct() {

		$this->name = 'advanced_taxonomy_selector';
		$this->label = __('Advanced Taxonomy Selector', 'acf-advanced_taxonomy_selector');
		$this->category = 'Relational';

		$this->defaults = array(
			'taxonomies' => '',
			'data_type' => 'terms',
			'field_type' => 'multiselect',
			'allow_null' => true,
			'post_type'  => false,
			'return_value' => 'term_id'
		);

		parent::__construct();

	}


	/**
	 * Field Options
	 *
	 * Creates the options for the field, they are shown when the user
	 * creates a field in the back-end. Currently there are six fields.
	 *
	 * The Type sets the field to a term or a taxonomy selector
	 *
	 * The Taxonomies setting will put a restriction on the taxonomies shown
	 *
	 * The Restrict To Post Type setting allows you to restrict to taxonomies
	 * defined for the selected post types
	 *
	 * The Field Type setting sets the type of field shown to the user
	 *
	 * By checking Allow Null you can make sure that users can select an empty
	 * value
	 *
	 * The Return Value determines how the value is returned to be used on the
	 * front end
	 *
	 * @param array $field The details of this field
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function render_field_settings( $field ) {

		acf_render_field_setting( $field, array(
			'label'			=> __('Type','acf-advanced-taxonomy-selector'),
			'type'			=> 'radio',
			'name'			=> 'data_type',
			'choices' =>  array(
				'terms' => __( 'Term Selector', 'acf-advanced-taxonomy-selector' ),
				'taxonomy'  => __( 'Taxonomy Selector', 'acf-advanced-taxonomy-selector' ),
			)
		));

		acf_render_field_setting( $field, array(
			'label'			=> __('Taxonomy Restrictions','acf-advanced-taxonomy-selector'),
			'type'			=> 'select',
			'name'			=> 'taxonomies',
			'multiple'      =>  true,
			'choices'       =>  acfats_taxonomies_array()
		));

		acf_render_field_setting( $field, array(
			'label'			=> __('Post Type Restrictions','acf-advanced-taxonomy-selector'),
			'type'			=> 'select',
			'name'			=> 'post_type',
			'multiple'      =>  true,
			'choices'       =>  acfats_post_types_array()
		));

		acf_render_field_setting( $field, array(
			'label'			=> __('Field Type','acf-advanced-taxonomy-selector'),
			'type'			=> 'select',
			'name'			=> 'field_type',
			'choices' =>  array(
				'multiselect'  => __( 'Multiselect', 'acf-advanced-taxonomy-selector' ),
				'select'       => __( 'Select', 'acf-advanced-taxonomy-selector' )
			)
		));

		acf_render_field_setting( $field, array(
			'label'			=> __('Allow Null?','acf-advanced-taxonomy-selector'),
			'type'			=> 'radio',
			'name'			=> 'allow_null',
			'layout'  => 'horizontal',
			'choices' =>  array(
				1 => __( 'Yes', 'acf-advanced-taxonomy-selector' ),
				0  => __( 'No', 'acf-advanced-taxonomy-selector' ),
			)
		));

		acf_render_field_setting( $field, array(
			'label'			=> __('Return Value','acf-advanced-taxonomy-selector'),
			'type'			=> 'radio',
			'name'			=> 'return_value',
			'choices' =>  array(
				'term_id' => __( 'Term ID / Taxonomy Slug', 'acf-advanced-taxonomy-selector' ),
				'object'  => __( 'Term Object / Taxonomy Object', 'acf-advanced-taxonomy-selector' ),
			)
		));


	}


	/**
	 * Field Display
	 *
	 * This function takes care of displaying our field to the users, taking
	 * the field options into account.
	 *
	 * @param array $field The details of this field
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function render_field( $field ) {
		call_user_func( array( $this, 'render_field_' . $field['data_type'] ), $field );
	}


	/**
	 * Term Type Field Display
	 *
	 * Displays the field when the Type setting is set to term
	 *
	 * @param array $field The details of this field
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function render_field_terms( $field ) {
		$taxonomies = acfats_get_taxonomies_from_selection( $field );
		$multiple = ( $field['field_type'] == 'multiselect' ) ? 'multiple="multiple"' : '';

		foreach( $taxonomies as $slug => $taxonomy ) {
			if( wp_count_terms( $slug ) == 0 ) {
				unset( $taxonomies[$slug] );
			}
		}
		?>
		<select name="<?php echo $field['name'] ?>[]" <?php echo $multiple ?>>
			<?php if( $field['allow_null'] == true ) : ?>
			<option value=''><?php _e( 'None', 'acf-advanced_taxonomy_selector' ) ?></option>
			<?php endif ?>
			<?php
				foreach( $taxonomies as $taxonomy ) :
			?>
				<optgroup label='<?php echo $taxonomy->label ?>'>
					<?php
						$terms = get_terms( $taxonomy->name, array( 'hide_empty' => false ) );
						foreach( $terms as $term ) :
							$selected = ( !empty( $field['value'] ) && in_array( $taxonomy->name . '_' . $term->term_id, $field['value'] ) ) ? 'selected="selected"' : '';
					?>
						<option <?php echo $selected ?> value='<?php echo $taxonomy->name ?>_<?php echo $term->term_id ?>'><?php echo $term->name ?></option>
					<?php endforeach ?>
				</optgroup>
			<?php endforeach ?>
		</select>

		<?php
	}

	/**
	 * Taxonomy Type Field Display
	 *
	 * Displays the field when the Type setting is set to taxonomy
	 *
	 * @param array $field The details of this field
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function render_field_taxonomy( $field ) {
		$taxonomies = acfats_get_taxonomies_from_selection( $field );
		$multiple = ( $field['field_type'] == 'multiselect' ) ? 'multiple="multiple"' : '';
		?>

		<select name="<?php echo $field['name'] ?>[]" <?php echo $multiple ?>>
			<?php if( $field['allow_null'] == true ) : ?>
			<option value=''><?php _e( 'None', 'acf-advanced_taxonomy_selector' ) ?></option>
			<?php endif ?>
			<?php if( empty( $taxonomies ) ) : ?>
				<option><?php _e( 'No Taxonomies Exist For This Post Type', 'acf-advanced_taxonomy_selector' ) ?></option>

			<?php else :
				foreach( $taxonomies as $taxonomy ) :
					$selected = ( !empty( $field['value'] ) && in_array( $taxonomy->name, $field['value'] ) ) ? 'selected="selected"' : '';
			?>
				<option <?php echo $selected ?> value='<?php echo $taxonomy->name ?>'><?php echo $taxonomy->label ?></option>
			<?php endforeach ?>
			<?php endif ?>
		</select>

		<?php
	}


	/**
	 * Pre-Save Value Modification
	 *
	 * Modifies the data before it is passed to the database for saving
	 *
	 * @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 details of this field
	 * @return mixed $value The modified value
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function update_value( $value, $post_id, $field ) {

		if( $value == array( 0 => '' ) ) {
			return '';
		}

		return $value;

	}


	/**
	 * Format Value
	 *
	 * This filter is appied to the $value after it is loaded from the
	 * db and before it is passed to the create_field action
	 *
	 * @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 details of this field
	 * @return mixed $value The modified value
	 * @author Daniel Pataki
	 * @since 3.0.0
	 *
	 */
	function format_value( $value, $post_id, $field ) {

		if( empty($value) ) {
			return $value;
		}

		if( $field['data_type'] == 'terms' ) {
			foreach( $value as $i => $val ) {
				$term = substr( $val, strrpos( $val, '_' ) + 1 );
				if( $field['return_value'] == 'object' ) {
					$taxonomy = substr( $val, 0, strrpos( $val, '_' ) );
					$term = get_term( $term, $taxonomy );
				}
				$value[$i] = $term;
			}
		}
		elseif( $field['data_type'] == 'taxonomy' && $field['return_value'] == 'object' ) {
			foreach( $value as $i => $val ) {
				$value[$i] = get_taxonomy( $val );
			}
		}

		return $value;
	}


}


// create field
new acf_field_advanced_taxonomy_selector();

?>