/*!
 * V4Fire Core
 * https://github.com/V4Fire/Core
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Core/blob/master/LICENSE
 */

import type { PerfPredicate } from 'core/perf/config';

/**
 * Internal timer measurement
 */
export interface PerfTimerMeasurement {
	/**
	 * Timestamp when the measurement was started
	 */
	startTimestamp: number;

	/**
	 * Full name of the measurement
	 */
	name: string;
}

/**
 * Performance timer
 */
export interface PerfTimer {
	/**
	 * Starts measuring for the specified name and returns an identifier of the metrics
	 * @param name - full name of the metrics
	 */
	start(name: string): PerfTimerId;

	/**
	 * Finishes started measurement by its identifier.
	 * Works together with the `start` method.
	 *
	 * @param timerId - id of the metrics to stop
	 * @param [additional] - additional parameters to send along with the metrics
	 */
	finish(timerId: PerfTimerId, additional?: Dictionary): void;

	/**
	 * Measures difference between the current moment and the time origin of a corresponding timers runner
	 *
	 * @param name - full name of the metrics
	 * @param [additional] - additional parameters to send along with the metrics
	 */
	markTimestamp(name: string, additional?: Dictionary): void;

	/**
	 * Returns a new instance of the performance timer but with the passed suffix
	 *
	 * @param ns - namespace suffix
	 *
	 * @example
	 * ```js
	 * // `timer` has a namespace "components"
	 * const timer = getTimer('components');
	 *
	 * // `newTimer` has a namespace "components.button"
	 * const newTimer = timer.namespace('button');
	 * ```
	 */
	namespace(ns: string): PerfTimer;
}

/**
 * Options of a performance timers runner
 */
export interface PerfTimersRunnerOptions {
	/**
	 * Predicate to filter metrics
	 */
	filter?: PerfPredicate;

	/**
	 * If `true`, then a moment of instantiating of the runner is considering as its time origin
	 */
	withCurrentTimeOrigin?: boolean;
}

export type PerfTimerId = CanUndef<string>;