<?php
/**
 * Abstract input field class which is used for all <input> fields.
 */
abstract class RWMB_Input_Field extends RWMB_Field
{
	/**
	 * Get field HTML
	 *
	 * @param mixed $meta
	 * @param array $field
	 * @return string
	 */
	static function html( $meta, $field )
	{
		$attributes = call_user_func( array( RW_Meta_Box::get_class_name( $field ), 'get_attributes' ), $field, $meta );
		return sprintf( '<input %s>%s', self::render_attributes( $attributes ), self::datalist_html( $field ) );
	}

	/**
	 * Normalize parameters for field
	 *
	 * @param array $field
	 * @return array
	 */
	static function normalize( $field )
	{
		$field = parent::normalize( $field );
		$field = wp_parse_args( $field, array(
			'datalist' => false,
			'readonly' => false,
		) );
		if ( $field['datalist'] )
		{
			$field['datalist'] = wp_parse_args( $field['datalist'], array(
				'id'      => $field['id'] . '_list',
				'options' => array(),
			) );
		}
		return $field;
	}

	/**
	 * Get the attributes for a field
	 *
	 * @param array $field
	 * @param mixed $value
	 * @return array
	 */
	static function get_attributes( $field, $value = null )
	{
		$attributes = parent::get_attributes( $field, $value );
		$attributes = wp_parse_args( $attributes, array(
			'list'        => $field['datalist'] ? $field['datalist']['id'] : false,
			'readonly'    => $field['readonly'],
			'value'       => $value,
			'placeholder' => $field['placeholder'],
		) );

		return $attributes;
	}

	/**
	 * Create datalist, if any
	 *
	 * @param array $field
	 * @return array
	 */
	static function datalist_html( $field )
	{
		if ( empty( $field['datalist'] ) )
			return '';

		$datalist = $field['datalist'];
		$html     = sprintf( '<datalist id="%s">', $datalist['id'] );
		foreach ( $datalist['options'] as $option )
		{
			$html .= sprintf( '<option value="%s"></option>', $option );
		}
		$html .= '</datalist>';
		return $html;
	}
}
