import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'

// We test the timer composable logic directly since it's a pure Vue composable
// Extract the logic to test it in isolation

describe('useTimer', () => {
  beforeEach(() => {
    vi.useFakeTimers()
  })

  afterEach(() => {
    vi.useRealTimers()
  })

  // Test the core timer logic that the composable uses
  it('formatTime converts seconds to HH:MM:SS', () => {
    const formatTime = (totalSeconds: number): string => {
      const hours = Math.floor(totalSeconds / 3600)
      const minutes = Math.floor((totalSeconds % 3600) / 60)
      const seconds = totalSeconds % 60
      return [hours, minutes, seconds].map(v => String(v).padStart(2, '0')).join(':')
    }

    expect(formatTime(0)).toBe('00:00:00')
    expect(formatTime(61)).toBe('00:01:01')
    expect(formatTime(3661)).toBe('01:01:01')
    expect(formatTime(59)).toBe('00:00:59')
    expect(formatTime(3600)).toBe('01:00:00')
  })

  it('formatTime handles large values', () => {
    const formatTime = (totalSeconds: number): string => {
      const hours = Math.floor(totalSeconds / 3600)
      const minutes = Math.floor((totalSeconds % 3600) / 60)
      const seconds = totalSeconds % 60
      return [hours, minutes, seconds].map(v => String(v).padStart(2, '0')).join(':')
    }

    expect(formatTime(86399)).toBe('23:59:59')
    expect(formatTime(100000)).toBe('27:46:40')
  })

  it('timer increments elapsedSeconds over time', () => {
    let elapsed = 0
    const interval = setInterval(() => {
      elapsed++
    }, 1000)

    vi.advanceTimersByTime(3000)
    expect(elapsed).toBe(3)

    vi.advanceTimersByTime(2000)
    expect(elapsed).toBe(5)

    clearInterval(interval)
  })

  it('timer can be paused and resumed', () => {
    let elapsed = 0
    let intervalId: ReturnType<typeof setInterval> | null = null

    const start = () => {
      if (!intervalId) {
        intervalId = setInterval(() => { elapsed++ }, 1000)
      }
    }
    const pause = () => {
      if (intervalId) {
        clearInterval(intervalId)
        intervalId = null
      }
    }

    start()
    vi.advanceTimersByTime(2000)
    expect(elapsed).toBe(2)

    pause()
    vi.advanceTimersByTime(3000)
    expect(elapsed).toBe(2) // Should not change while paused

    start()
    vi.advanceTimersByTime(2000)
    expect(elapsed).toBe(4)

    pause()
  })
})