"use strict";

const rules = require("./rules");

module.exports = {
	type: function (oldType, newType) {
		return {
			forward: rules.types[oldType].losslessConversionTo[newType],
			backward: rules.types[newType].losslessConversionTo[oldType],
		};
	},
	attribute: function (attribute, oldValue, newValue) {
		let canTransformForward = rules.attributes[attribute].isLossless(oldValue, newValue);
		let canTransformBackward = rules.attributes[attribute].isLossless(newValue, oldValue);

		return {
			forward: (canTransformForward) ? rules.attributes[attribute].losslessTransformer : undefined,
			backward: (canTransformBackward) ? rules.attributes[attribute].losslessTransformer : undefined,
		};
	}
};