import * as asn1js from "asn1js";
import { getParametersValue, clearProps } from "pvutils";
import Extension from "./Extension.js";
//**************************************************************************************
/**
 * Class from RFC5280
 */
export default class Extensions
{
	//**********************************************************************************
	/**
	 * Constructor for Extensions class
	 * @param {Object} [parameters={}]
	 * @param {Object} [parameters.schema] asn1js parsed value to initialize the class from
	 */
	constructor(parameters = {})
	{
		//region Internal properties of the object
		/**
		 * @type {Array.<Extension>}
		 * @desc type
		 */
		this.extensions = getParametersValue(parameters, "extensions", Extensions.defaultValues("extensions"));
		//endregion

		//region If input argument array contains "schema" for this object
		if("schema" in parameters)
			this.fromSchema(parameters.schema);
		//endregion
	}
	//**********************************************************************************
	/**
	 * Return default values for all class members
	 * @param {string} memberName String name for a class member
	 */
	static defaultValues(memberName)
	{
		switch(memberName)
		{
			case "extensions":
				return [];
			default:
				throw new Error(`Invalid member name for Extensions class: ${memberName}`);
		}
	}
	//**********************************************************************************
	/**
	 * Return value of pre-defined ASN.1 schema for current class
	 *
	 * ASN.1 schema:
	 * ```asn1
	 * Extensions  ::=  SEQUENCE SIZE (1..MAX) OF Extension
	 * ```
	 *
	 * @param {Object} parameters Input parameters for the schema
	 * @param {boolean} optional Flag that current schema should be optional
	 * @returns {Object} asn1js schema object
	 */
	static schema(parameters = {}, optional = false)
	{
		/**
		 * @type {Object}
		 * @property {string} [blockName]
		 * @property {string} [extensions]
		 * @property {string} [extension]
		 */
		const names = getParametersValue(parameters, "names", {});

		return (new asn1js.Sequence({
			optional,
			name: (names.blockName || ""),
			value: [
				new asn1js.Repeated({
					name: (names.extensions || ""),
					value: Extension.schema(names.extension || {})
				})
			]
		}));
	}
	//**********************************************************************************
	/**
	 * Convert parsed asn1js object into current class
	 * @param {!Object} schema
	 */
	fromSchema(schema)
	{
		//region Clear input data first
		clearProps(schema, [
			"extensions"
		]);
		//endregion
		
		//region Check the schema is valid
		const asn1 = asn1js.compareSchema(schema,
			schema,
			Extensions.schema({
				names: {
					extensions: "extensions"
				}
			})
		);

		if(asn1.verified === false)
			throw new Error("Object's schema was not verified against input data for Extensions");
		//endregion

		//region Get internal properties from parsed schema
		this.extensions = Array.from(asn1.result.extensions, element => new Extension({ schema: element }));
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convert current object to asn1js object and set correct values
	 * @returns {Object} asn1js object
	 */
	toSchema()
	{
		//region Construct and return new ASN.1 schema for this object
		return (new asn1js.Sequence({
			value: Array.from(this.extensions, element => element.toSchema())
		}));
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convertion for the class to JSON object
	 * @returns {Object}
	 */
	toJSON()
	{
		return {
			extensions: Array.from(this.extensions, element => element.toJSON())
		};
	}
	//**********************************************************************************
}
//**************************************************************************************