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Editing: index.js

// Attribute mapping configurations
const ATTRIBUTE_MAPPINGS = {
	// Direct mappings (modern.key -> legacy.key)
	direct: {
		queryType: 'content_source',
	},

// Nested mappings (modern.parent.child -> legacy.key)
	nested: {
		'baseQuery.perPage': 'items_count',
		'postsQuery.source': 'posts_source',
		'postsQuery.postTypesSet': 'post_types_set',
		'postsQuery.ids': 'posts_ids',
		'postsQuery.excludeIds': 'posts_excluded_ids',
		'postsQuery.order': 'posts_order_direction',
		'postsQuery.orderBy': 'posts_order_by',
		'postsQuery.offset': 'posts_offset',
		'postsQuery.taxonomies': 'posts_taxonomies',
		'postsQuery.taxonomiesRelation': 'posts_taxonomies_relation',
		'postsQuery.avoidDuplicates': 'posts_avoid_duplicate_posts',
		'postsQuery.customQuery': 'posts_custom_query',
		'imagesQuery.images': 'images',
		'imagesQuery.categories': 'image_categories',
		'imagesQuery.orderBy': 'images_order_by',
		'imagesQuery.order': 'images_order_direction',
		'imagesQuery.titlesSource': 'images_titles_source',
		'imagesQuery.descriptionsSource': 'images_descriptions_source',
	},
};

// Value transformations for attributes that need different values
const VALUE_TRANSFORMATIONS = {
	// Modern value -> Legacy value
	modernToLegacy: {
		queryType: {
			posts: 'post-based',
		},
	},
	// Legacy value -> Modern value
	legacyToModern: {
		content_source: {
			'post-based': 'posts',
		},
	},
};

// Default structures for modern attributes
const MODERN_DEFAULTS = {
	baseQuery: {
		perPage: 6,
		maxPages: 1,
	},
	postsQuery: {
		source: 'portfolio',
		postTypesSet: [ 'post' ],
		ids: [],
		excludeIds: [],
		order: 'desc',
		orderBy: 'post_date',
		offset: 0,
		taxonomies: [],
		taxonomiesRelation: 'or',
		avoidDuplicates: false,
		customQuery: '',
	},
	imagesQuery: {
		images: [],
		categories: [],
		orderBy: 'default',
		order: 'asc',
		titlesSource: 'custom',
		descriptionsSource: 'custom',
	},
};

// Helper functions
function getNestedValue( obj, path ) {
	return path
		.split( '.' )
		.reduce( ( current, key ) => current?.[ key ], obj );
}

/**
 * Convert modern attributes to legacy format
 *
 * @param {Object}  modernAttributes - Modern attributes object.
 * @param {boolean} includeDefaults  - Whether to include default structure for unset values.
 * @return {Object} Legacy attributes object.
 */
function convertModernToLegacy( modernAttributes, includeDefaults = false ) {
	const legacy = {};

// Merge with defaults if includeDefaults is true.
	let attributesToConvert = modernAttributes;
	if ( includeDefaults ) {
		attributesToConvert = {};
		// Deep merge defaults with provided attributes
		Object.entries( MODERN_DEFAULTS ).forEach(
			( [ key, defaultValue ] ) => {
				attributesToConvert[ key ] = {
					...defaultValue,
					...modernAttributes[ key ],
				};
			}
		);
		// Add any additional keys from modernAttributes that aren't in defaults
		Object.keys( modernAttributes ).forEach( ( key ) => {
			if ( ! MODERN_DEFAULTS[ key ] ) {
				attributesToConvert[ key ] = modernAttributes[ key ];
			}
		} );
	}

// Handle direct mappings
	Object.entries( ATTRIBUTE_MAPPINGS.direct ).forEach(
		( [ modernKey, legacyKey ] ) => {
			if ( attributesToConvert[ modernKey ] !== undefined ) {
				let value = attributesToConvert[ modernKey ];

// Apply value transformation if needed
				if ( VALUE_TRANSFORMATIONS.modernToLegacy[ modernKey ] ) {
					value =
						VALUE_TRANSFORMATIONS.modernToLegacy[ modernKey ][
							value
						] || value;
				}

legacy[ legacyKey ] = value;
			}
		}
	);

// Handle nested mappings
	Object.entries( ATTRIBUTE_MAPPINGS.nested ).forEach(
		( [ modernPath, legacyKey ] ) => {
			const value = getNestedValue( attributesToConvert, modernPath );
			if ( value !== undefined ) {
				legacy[ legacyKey ] = value;
			}
		}
	);

return legacy;
}

/**
 * Convert legacy attributes to modern format
 *
 * @param {Object}  legacyAttributes - Legacy attributes object.
 * @param {boolean} includeDefaults  - Whether to include default structure for unset values.
 * @return {Object} Modern attributes object.
 */
function convertLegacyToModern( legacyAttributes, includeDefaults = false ) {
	const modern = {};

// Set default structure only if includeDefaults is true.
	if ( includeDefaults ) {
		Object.entries( MODERN_DEFAULTS ).forEach(
			( [ key, defaultValue ] ) => {
				modern[ key ] = { ...defaultValue };
			}
		);
	}

// Handle direct mappings (reverse)
	Object.entries( ATTRIBUTE_MAPPINGS.direct ).forEach(
		( [ modernKey, legacyKey ] ) => {
			if ( legacyAttributes[ legacyKey ] !== undefined ) {
				let value = legacyAttributes[ legacyKey ];

// Apply value transformation if needed
				if ( VALUE_TRANSFORMATIONS.legacyToModern[ legacyKey ] ) {
					value =
						VALUE_TRANSFORMATIONS.legacyToModern[ legacyKey ][
							value
						] || value;
				}

modern[ modernKey ] = value;
			}
		}
	);

// Handle nested mappings (reverse)
	Object.entries( ATTRIBUTE_MAPPINGS.nested ).forEach(
		( [ modernPath, legacyKey ] ) => {
			if ( legacyAttributes[ legacyKey ] !== undefined ) {
				setNestedValue(
					modern,
					modernPath,
					legacyAttributes[ legacyKey ]
				);
			}
		}
	);

return modern;
}

// Export functions
export { convertLegacyToModern, convertModernToLegacy };