<?php

namespace Glovario\Domain;

defined( 'ABSPATH' ) || exit;

final class TypeRegistry {
	public function all() {
		$types = array(
			'text'      => array( 'label' => __( 'Text', 'glovario' ) ),
			'multiline' => array( 'label' => __( 'Multiline text', 'glovario' ) ),
			'url'       => array( 'label' => __( 'URL', 'glovario' ) ),
			'email'     => array( 'label' => __( 'Email', 'glovario' ) ),
			'number'    => array( 'label' => __( 'Number', 'glovario' ) ),
			'image'     => array( 'label' => __( 'Image', 'glovario' ) ),
		);

		/**
		 * Filter registered variable types.
		 *
		 * Each type requires a translatable label. Custom sanitization, validation,
		 * and rendering can use the dedicated filters below.
		 */
		return apply_filters( 'glovario_supported_variable_types', $types );
	}

	public function exists( $type ) {
		// Imports and filters can pass anything; only a string can name a type.
		return is_string( $type ) && isset( $this->all()[ $type ] );
	}

	public function sanitize( $value, $type ) {
		switch ( $type ) {
			case 'multiline':
				$value = sanitize_textarea_field( $value );
				break;
			case 'url':
				$value = esc_url_raw( $value );
				break;
			case 'email':
				$value = sanitize_email( $value );
				break;
			case 'number':
				$value = sanitize_text_field( $value );
				break;
			case 'image':
				// The attachment ID of an image in the Media Library.
				$value = absint( $value ) ? (string) absint( $value ) : '';
				break;
			default:
				$value = sanitize_text_field( $value );
		}
		return apply_filters( 'glovario_sanitized_variable_value', $value, $type );
	}

	public function validate( $value, $type ) {
		if ( ! $this->exists( $type ) ) {
			return new \WP_Error( 'invalid_type', __( 'Select a supported variable type.', 'glovario' ) );
		}
		if ( 'url' === $type && '' !== $value && ! wp_http_validate_url( $value ) ) {
			return new \WP_Error( 'invalid_url', __( 'Enter a valid HTTP or HTTPS URL.', 'glovario' ) );
		}
		if ( 'email' === $type && '' !== $value && ! is_email( $value ) ) {
			return new \WP_Error( 'invalid_email', __( 'Enter a valid email address.', 'glovario' ) );
		}
		if ( 'number' === $type && '' !== $value && ! is_numeric( $value ) ) {
			return new \WP_Error( 'invalid_number', __( 'Enter a valid number.', 'glovario' ) );
		}
		if ( 'image' === $type && '' !== (string) $value && ! self::is_image( $value ) ) {
			return new \WP_Error( 'invalid_image', __( 'Choose an image from the Media Library.', 'glovario' ) );
		}
		return apply_filters( 'glovario_validate_variable_value', true, $value, $type );
	}

	/**
	 * Whether a value is the ID of an image attachment.
	 *
	 * @param mixed $value Candidate attachment ID.
	 * @return bool
	 */
	public static function is_image( $value ) {
		$id = is_scalar( $value ) && ctype_digit( trim( (string) $value ) ) ? absint( $value ) : 0;
		return $id && 'attachment' === get_post_type( $id ) && wp_attachment_is_image( $id );
	}
}