/**
 * Copyright © Volker Schukai and all contributing authors, {{copyRightYear}}. All rights reserved.
 * Node module: @schukai/monster
 *
 * This source code is licensed under the GNU Affero General Public License version 3 (AGPLv3).
 * The full text of the license can be found at: https://www.gnu.org/licenses/agpl-3.0.en.html
 *
 * For those who do not wish to adhere to the AGPLv3, a commercial license is available.
 * Acquiring a commercial license allows you to use this software without complying with the AGPLv3 terms.
 * For more information about purchasing a commercial license, please contact Volker Schukai.
 *
 * SPDX-License-Identifier: AGPL-3.0
 */

import { Base } from "../types/base.mjs";
import { validateString } from "../types/validate.mjs";
import { Transformer } from "./transformer.mjs";

export { Pipe };

/**
 * @private
 * @type {string}
 */
const DELIMITER = "|";

/**
 * The pipe class makes it possible to combine several processing steps.
 *
 * A pipe consists of commands whose input and output are connected with the pipe symbol `|`.
 *
 * With the Pipe, processing steps can be combined. Here, the value of an object is accessed via the pathfinder (path command).
 * the word is then converted to uppercase letters and a prefix Hello is added. the two backslash safe the space char.
 *
 * @example /examples/libraries/pipe/example-1/
 *
 * @license AGPLv3
 * @since 1.5.0
 * @copyright Volker Schukai
 * @summary A processing pipeline utility for chaining multiple data transformation steps.
 */
class Pipe extends Base {
	/**
	 * @param {string} pipe a pipe consists of commands whose input and output are connected with the pipe symbol `|`.
	 * @throws {TypeError}
	 */
	constructor(pipe) {
		super();
		validateString(pipe);

		this.pipe = pipe.split(DELIMITER).map((v) => {
			return new Transformer(v);
		});
	}

	/**
	 * @param {string} name
	 * @param {function} callback
	 * @param {object} context
	 * @return {Pipe}
	 * @throws {TypeError} value is not a string
	 * @throws {TypeError} value is not a function
	 */
	setCallback(name, callback, context) {
		for (const [, t] of Object.entries(this.pipe)) {
			t.setCallback(name, callback, context);
		}

		return this;
	}

	/**
	 * run a pipe
	 *
	 * @param {*} value
	 * @return {*}
	 */
	run(value) {
		return this.pipe.reduce((accumulator, transformer, currentIndex, array) => {
			return transformer.run(accumulator);
		}, value);
	}
}
