/**
 * Deterministic clock for Storybook stories.
 *
 * Stories that render relative timestamps ("3m ago", "yesterday") must use these
 * helpers instead of `new Date()` / `Date.now()`, or visual diffs in Chromatic
 * will drift on every run.
 *
 * FROZEN_NOW is the reference instant. Helpers below produce timestamps relative
 * to it so the rendered output is identical regardless of when the build runs.
 */

export const FROZEN_NOW = new Date('2026-01-15T12:00:00.000Z')

const MS_PER_SEC = 1000
const MS_PER_MIN = 60 * MS_PER_SEC
const MS_PER_HOUR = 60 * MS_PER_MIN
const MS_PER_DAY = 24 * MS_PER_HOUR

export const now = (): Date => new Date(FROZEN_NOW)

export const secondsAgo = (n: number): Date =>
  new Date(FROZEN_NOW.getTime() - n * MS_PER_SEC)

export const minutesAgo = (n: number): Date =>
  new Date(FROZEN_NOW.getTime() - n * MS_PER_MIN)

export const hoursAgo = (n: number): Date =>
  new Date(FROZEN_NOW.getTime() - n * MS_PER_HOUR)

export const daysAgo = (n: number): Date =>
  new Date(FROZEN_NOW.getTime() - n * MS_PER_DAY)