<?php

/**

 * WP_Theme_JSON_Schema class

 *

 * @package WordPress

 * @subpackage Theme

 * @since 5.9.0

 */

/**

 * Class that migrates a given theme.json structure to the latest schema.

 *

 * This class is for internal core usage and is not supposed to be used by extenders (plugins and/or themes).

 * This is a low-level API that may need to do breaking changes. Please,

 * use get_global_settings, get_global_styles, and get_global_stylesheet instead.

 *

 * @since 5.9.0

 * @access private

 */

class WP_Theme_JSON_Schema {

	/**

	 * Maps old properties to their new location within the schema's settings.

	 * This will be applied at both the defaults and individual block levels.

	 */

	const V1_TO_V2_RENAMED_PATHS = array(

		'border.customRadius'         => 'border.radius',

		'spacing.customMargin'        => 'spacing.margin',

		'spacing.customPadding'       => 'spacing.padding',

		'typography.customLineHeight' => 'typography.lineHeight',

	);

	/**

	 * Function that migrates a given theme.json structure to the last version.

	 *

	 * @since 5.9.0

	 *

	 * @param array $theme_json The structure to migrate.

	 *

	 * @return array The structure in the last version.

	 */

	public static function migrate( $theme_json ) {

		if ( ! isset( $theme_json['version'] ) ) {

			$theme_json = array(

				'version' => WP_Theme_JSON::LATEST_SCHEMA,

			);

		}

		if ( 1 === $theme_json['version'] ) {

			$theme_json = self::migrate_v1_to_v2( $theme_json );

		}

		return $theme_json;

	}

	/**

	 * Removes the custom prefixes for a few properties

	 * that were part of v1:

	 *

	 * 'border.customRadius'         => 'border.radius',

	 * 'spacing.customMargin'        => 'spacing.margin',

	 * 'spacing.customPadding'       => 'spacing.padding',

	 * 'typography.customLineHeight' => 'typography.lineHeight',

	 *

	 * @since 5.9.0

	 *

	 * @param array $old Data to migrate.

	 *

	 * @return array Data without the custom prefixes.

	 */

	private static function migrate_v1_to_v2( $old ) {

		// Copy everything.

		$new = $old;

		// Overwrite the things that changed.

		if ( isset( $old['settings'] ) ) {

			$new['settings'] = self::rename_paths( $old['settings'], self::V1_TO_V2_RENAMED_PATHS );

		}

		// Set the new version.

		$new['version'] = 2;

		return $new;

	}

	/**

	 * Processes the settings subtree.

	 *

	 * @since 5.9.0

	 *

	 * @param array $settings        Array to process.

	 * @param array $paths_to_rename Paths to rename.

	 *

	 * @return array The settings in the new format.

	 */

	private static function rename_paths( $settings, $paths_to_rename ) {

		$new_settings = $settings;

		// Process any renamed/moved paths within default settings.

		self::rename_settings( $new_settings, $paths_to_rename );

		// Process individual block settings.

		if ( isset( $new_settings['blocks'] ) && is_array( $new_settings['blocks'] ) ) {

			foreach ( $new_settings['blocks'] as &$block_settings ) {

				self::rename_settings( $block_settings, $paths_to_rename );

			}

		}

		return $new_settings;

	}

	/**

	 * Processes a settings array, renaming or moving properties.

	 *

	 * @since 5.9.0

	 *

	 * @param array $settings        Reference to settings either defaults or an individual block's.

	 * @param array $paths_to_rename Paths to rename.

	 */

	private static function rename_settings( &$settings, $paths_to_rename ) {

		foreach ( $paths_to_rename as $original => $renamed ) {

			$original_path = explode( '.', $original );

			$renamed_path  = explode( '.', $renamed );

			$current_value = _wp_array_get( $settings, $original_path, null );

			if ( null !== $current_value ) {

				_wp_array_set( $settings, $renamed_path, $current_value );

				self::unset_setting_by_path( $settings, $original_path );

			}

		}

	}

	/**

	 * Removes a property from within the provided settings by its path.

	 *

	 * @since 5.9.0

	 *

	 * @param array $settings Reference to the current settings array.

	 * @param array $path Path to the property to be removed.

	 *

	 * @return void

	 */

	private static function unset_setting_by_path( &$settings, $path ) {

		$tmp_settings = &$settings; // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable

		$last_key     = array_pop( $path );

		foreach ( $path as $key ) {

			$tmp_settings = &$tmp_settings[ $key ];

		}

		unset( $tmp_settings[ $last_key ] );

	}

}