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

/**
 * [[include:core/perf/timer/README.md]]
 * @packageDocumentation
 */

import type { PerfGroup } from 'core/perf/interface';

import { PerfTimersRunner, PerfTimer } from 'core/perf/timer/impl';
import { getTimerEngine, createPredicates, PerfTimerConfig } from 'core/perf/config';

import type { PerfTimerFactory } from 'core/perf/timer/interface';

export * from 'core/perf/timer/interface';

/**
 * Returns a timers' factory for the passed config
 * @param config - config, that the new factory will use
 */
export function getTimerFactory(config: PerfTimerConfig): PerfTimerFactory {
	return (() => {
		const
			runners: Partial<Record<PerfGroup, PerfTimersRunner>> = Object.createDict(),
			scopedRunners: Dictionary<PerfTimersRunner> = Object.createDict(),
			engine = getTimerEngine(config),
			predicates = createPredicates(config.filters ?? Object.createDict());

		return {
			getTimer(group: PerfGroup): PerfTimer {
				if (runners[group] == null) {
					runners[group] = new PerfTimersRunner(engine, {filter: predicates[group]});
				}

				return runners[group]!.createTimer(group);
			},

			getScopedTimer(group: PerfGroup, scope: string): PerfTimer {
				const
					key = `${group}_${scope}`;

				let
					scopedRunner = scopedRunners[key];

				if (scopedRunner == null) {
					scopedRunner = new PerfTimersRunner(engine, {filter: predicates[group], withCurrentTimeOrigin: true});
					scopedRunners[key] = scopedRunner;
				}

				return scopedRunner.createTimer(group);
			}
		};
	})();
}