/**
 * -------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.
 * See License in the project root for license information.
 * -------------------------------------------------------------------------------------------
 */

/**
 * @module RedirectHandlerOptions
 */

import { MiddlewareOptions } from "./IMiddlewareOptions";

/**
 * @type
 * A type declaration for shouldRetry callback
 */
export type ShouldRedirect = (response: Response) => boolean;

/**
 * @class
 * @implements MiddlewareOptions
 * A class representing RedirectHandlerOptions
 */
export class RedirectHandlerOptions implements MiddlewareOptions {
	/**
	 * @private
	 * @static
	 * A member holding default max redirects value
	 */
	private static DEFAULT_MAX_REDIRECTS = 5;

	/**
	 * @private
	 * @static
	 * A member holding maximum max redirects value
	 */
	private static MAX_MAX_REDIRECTS = 20;

	/**
	 * @public
	 * A member holding max redirects value
	 */
	public maxRedirects: number;

	/**
	 * @public
	 * A member holding shouldRedirect callback
	 */
	public shouldRedirect: ShouldRedirect;

	/**
	 * @private
	 * A member holding default shouldRedirect callback
	 */
	private static defaultShouldRedirect: ShouldRedirect = () => true;

	/**
	 * @public
	 * @constructor
	 * To create an instance of RedirectHandlerOptions
	 * @param {number} [maxRedirects = RedirectHandlerOptions.DEFAULT_MAX_REDIRECTS] - The max redirects value
	 * @param {ShouldRedirect} [shouldRedirect = RedirectHandlerOptions.DEFAULT_SHOULD_RETRY] - The should redirect callback
	 * @returns An instance of RedirectHandlerOptions
	 */
	public constructor(maxRedirects: number = RedirectHandlerOptions.DEFAULT_MAX_REDIRECTS, shouldRedirect: ShouldRedirect = RedirectHandlerOptions.defaultShouldRedirect) {
		if (maxRedirects > RedirectHandlerOptions.MAX_MAX_REDIRECTS) {
			const error = new Error(`MaxRedirects should not be more than ${RedirectHandlerOptions.MAX_MAX_REDIRECTS}`);
			error.name = "MaxLimitExceeded";
			throw error;
		}
		if (maxRedirects < 0) {
			const error = new Error(`MaxRedirects should not be negative`);
			error.name = "MinExpectationNotMet";
			throw error;
		}
		this.maxRedirects = maxRedirects;
		this.shouldRedirect = shouldRedirect;
	}
}