/**
 * Server-stamped phase timer math: every screen (admin, jury, big screen)
 * derives the same countdown from cursor timestamps — no client-local clocks.
 */
import { describe, it, expect } from 'vitest'
import { elapsedMs, remainingSeconds, formatClock } from '@/lib/live-timer'

const t0 = new Date('2026-06-11T10:00:00Z')
const at = (s: number) => new Date(t0.getTime() + s * 1000)

describe('live-timer', () => {
  it('elapsedMs counts from phaseStartedAt', () => {
    expect(
      elapsedMs(
        { phaseStartedAt: t0, phaseDurationSeconds: 300, phasePausedAt: null, phasePausedAccumMs: 0 },
        at(90)
      )
    ).toBe(90_000)
  })

  it('elapsedMs freezes while paused and subtracts accumulated pause', () => {
    // paused at +60s, asked at +90s → frozen at 60s
    expect(
      elapsedMs(
        { phaseStartedAt: t0, phaseDurationSeconds: 300, phasePausedAt: at(60), phasePausedAccumMs: 0 },
        at(90)
      )
    ).toBe(60_000)
    // resumed with 30s pause accumulated, asked at +120s → 90s elapsed
    expect(
      elapsedMs(
        { phaseStartedAt: t0, phaseDurationSeconds: 300, phasePausedAt: null, phasePausedAccumMs: 30_000 },
        at(120)
      )
    ).toBe(90_000)
  })

  it('elapsedMs accepts ISO strings (serialized cursor)', () => {
    expect(
      elapsedMs(
        {
          phaseStartedAt: t0.toISOString(),
          phaseDurationSeconds: 300,
          phasePausedAt: null,
          phasePausedAccumMs: 0,
        },
        at(45)
      )
    ).toBe(45_000)
  })

  it('remainingSeconds goes negative on overtime', () => {
    expect(
      remainingSeconds(
        { phaseStartedAt: t0, phaseDurationSeconds: 60, phasePausedAt: null, phasePausedAccumMs: 0 },
        at(75)
      )
    ).toBe(-15)
  })

  it('remainingSeconds is null without a running timer', () => {
    expect(
      remainingSeconds(
        { phaseStartedAt: null, phaseDurationSeconds: null, phasePausedAt: null, phasePausedAccumMs: 0 },
        t0
      )
    ).toBeNull()
  })

  it('formatClock renders m:ss and overtime as +m:ss', () => {
    expect(formatClock(305)).toBe('5:05')
    expect(formatClock(0)).toBe('0:00')
    expect(formatClock(-83)).toBe('+1:23')
  })
})