<?php
namespace Linguator\Includes\Walkers;

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * @package Linguator
 */
/**
 * Displays languages in a dropdown list
 *
 *  
 *   Extends `Linguator_Walker` now.
 */
class Linguator_Walker_Dropdown extends Linguator_Walker {
	/**
	 * Database fields to use.
	 *
	 * @see https://developer.wordpress.org/reference/classes/walker/#properties Walker::$db_fields.
	 *
	 * @var string[]
	 */
	public $db_fields = array( 'parent' => 'parent', 'id' => 'id' );

	/**
	 * Outputs one element.
	 *
	 *  
	 *
	 * @param string   $output            Passed by reference. Used to append additional content.
	 * @param stdClass $element           The data object.
	 * @param int      $depth             Depth of the item.
	 * @param array    $args              An array of additional arguments.
	 * @param int      $current_object_id ID of the current item.
	 * @return void
	 */
	public function start_el( &$output, $element, $depth = 0, $args = array(), $current_object_id = 0 ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		$value_type = $args['value'];

		// Some data from the language object to be passed as HTML data attributes for fetching in JS.
		$data_lang = array(
			'id'   => $element->id,
			'name' => $element->name,
			'slug' => $element->slug,
			'dir'  => $element->is_rtl ?? '',
		);

		$output .= sprintf(
			"\t" . '<option value="%1$s"%2$s%3$s data-lang="%5$s">%4$s</option>' . "\n",
			'url' === $value_type ? esc_url( $element->$value_type ) : esc_attr( $element->$value_type ),
			! empty( $element->locale ) ? sprintf( ' lang="%s"', esc_attr( $element->locale ) ) : '',
			selected( isset( $args['selected'] ) && $args['selected'] === $element->$value_type, true, false ),
			esc_html( $element->name ),
			esc_html( (string) wp_json_encode( $data_lang ) )
		);
	}

	/**
	 * Starts the output of the dropdown list
	 *
	 *  
	 *   Use $max_depth and ...$args parameters to follow the move of WP 5.3
	 *
	 * List of parameters accepted in $args:
	 *
	 * flag     => display the selected language flag in front of the dropdown if set to 1, defaults to 0
	 * value    => the language field to use as value attribute, defaults to 'slug'
	 * selected => the selected value, mandatory
	 * name     => the select name attribute, defaults to 'lang_choice'
	 * id       => the select id attribute, defaults to $args['name']
	 * class    => the class attribute
	 * disabled => disables the dropdown if set to 1
	 *
	 * @param array $elements  An array of `Linguator_language` or `stdClass` elements.
	 * @param int   $max_depth The maximum hierarchical depth.
	 * @param mixed ...$args   Additional arguments.
	 * @return string The hierarchical item output.
	 *
	 * @phpstan-param array<Linguator_Language|stdClass> $elements
	 */
	public function walk( $elements, $max_depth, ...$args ) { // // phpcs:ignore WordPressVIPMinimum.Classes.DeclarationCompatibility.DeclarationCompatibility
		$output = '';

		$this->maybe_fix_walk_args( $max_depth, $args );

		$args = wp_parse_args( $args, array( 'value' => 'slug', 'name' => 'lang_choice' ) );

		if ( ! empty( $args['flag'] ) ) {
			$current = wp_list_filter( $elements, array( $args['value'] => $args['selected'] ) );
			$lang = reset( $current );
			if ( $lang && is_object( $lang ) ) {
				$output = sprintf(
					'<span class="lmat-select-flag">%s</span>',
					empty( $lang->flag )
						? esc_html( $lang->slug )
						: wp_kses(
							(string) $lang->flag,
							array(
								'img' => array(
									'src'      => true,
									'alt'      => true,
									'class'    => true,
									'width'    => true,
									'height'   => true,
									'style'    => true,
									'decoding' => true,
									'loading'  => true,
									'title'    => true,
								),
								'span' => array( 'class' => true, 'style' => true ),
							),
							array_merge( wp_allowed_protocols(), array( 'data' ) )
						)
				);
			}
		}

		$output .= sprintf(
			'<select name="%1$s"%2$s%3$s%4$s>' . "\n" . '%5$s' . "\n" . '</select>' . "\n",
			esc_attr( $args['name'] ),
			isset( $args['id'] ) && ! $args['id'] ? '' : ' id="' . ( empty( $args['id'] ) ? esc_attr( $args['name'] ) : esc_attr( $args['id'] ) ) . '"',
			empty( $args['class'] ) ? '' : ' class="' . esc_attr( $args['class'] ) . '"',
			disabled( empty( $args['disabled'] ), false, false ),
			parent::walk( $elements, $max_depth, $args )
		);

		return $output;
	}
}

