/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

/** Converts the specified speed factor into the exact static enter duration. */
export function convertSpeedFactorToDuration(factor: number) {
  // Based on the numeric speed factor value that only affected the `enterDuration` we can
  // now calculate the exact `enterDuration`. 450ms is the enter duration without factor.
  return 450 / (factor || 1);
}

/**
 * Creates a runtime TypeScript expression that can be used in order to calculate the duration
 * from the speed factor expression that couldn't be statically analyzed.
 *
 * @param speedFactorValue Speed factor expression that couldn't be statically analyzed.
 */
export function createSpeedFactorConvertExpression(speedFactorValue: string): string {
  // To be sure that the speed factor value expression is calculated properly, we need to add
  // the according parenthesis.
  return `450 / (${speedFactorValue})`;
}