<?php

namespace Glovario\Domain;

defined( 'ABSPATH' ) || exit;

final class Renderer {
	private $types;

	public function __construct( TypeRegistry $types ) {
		$this->types = $types;
	}

	public function render( $value, $type, $context = array() ) {
		switch ( $type ) {
			case 'multiline':
				$output = nl2br( esc_html( (string) $value ) );
				break;
			case 'url':
				$output = esc_url( (string) $value );
				break;
			case 'email':
				$output = esc_html( (string) $value );
				break;
			case 'image':
				$output = $this->image( $value, $context );
				break;
			default:
				$output = esc_html( (string) $value );
		}
		$filtered = apply_filters( 'glovario_rendered_value', $output, $value, $type, $context );
		// A callback may have added markup: allow only what post content allows.
		return $filtered === $output ? $output : wp_kses( (string) $filtered, self::allowed_html() );
	}

	/**
	 * Post content markup plus the responsive image attributes that
	 * wp_get_attachment_image() prints, for output changed by a filter.
	 *
	 * @return array Allowed HTML for wp_kses().
	 */
	private static function allowed_html() {
		$allowed        = wp_kses_allowed_html( 'post' );
		$allowed['img'] = array_merge(
			$allowed['img'] ?? array(),
			array(
				'srcset'        => true,
				'sizes'         => true,
				'decoding'      => true,
				'fetchpriority' => true,
			)
		);
		return $allowed;
	}

	/**
	 * A value as plain text, for places that cannot show markup such as titles,
	 * menus, and search results; an image becomes its alternative text.
	 *
	 * @param mixed  $value Resolved value.
	 * @param string $type  Variable type.
	 * @return string
	 */
	public static function text( $value, $type ) {
		if ( 'image' !== $type ) {
			return (string) $value;
		}
		if ( ! TypeRegistry::is_image( $value ) ) {
			return '';
		}
		$alt = trim( (string) get_post_meta( absint( $value ), '_wp_attachment_image_alt', true ) );
		return '' !== $alt ? $alt : get_the_title( absint( $value ) );
	}

	/**
	 * Responsive image markup from the Media Library, with its alternative text.
	 *
	 * @param mixed $value   Attachment ID.
	 * @param array $context Render context; image_size selects a registered size.
	 * @return string
	 */
	private function image( $value, $context ) {
		if ( ! TypeRegistry::is_image( $value ) ) {
			return '';
		}
		$size = sanitize_key( (string) ( $context['image_size'] ?? '' ) );
		if ( ! in_array( $size, array_merge( get_intermediate_image_sizes(), array( 'full' ) ), true ) ) {
			$size = 'full';
		}
		return wp_get_attachment_image( absint( $value ), $size, false, array( 'class' => 'glovario-image' ) );
	}
}