import { describe, it, expect } from 'vitest'
import { formatDuration } from './QueryPerformance.utils'
import { calculatePercentilesFromHistogram } from './WithMonitor/WithMonitor.utils'

describe('formatDuration', () => {
  it('should format seconds', () => {
    expect(formatDuration(1000)).toBe('1.00s')
    expect(formatDuration(30000)).toBe('30.00s')
  })

  it('should format minutes and seconds', () => {
    expect(formatDuration(60000)).toBe('1m')
    expect(formatDuration(125000)).toBe('2m 5s')
  })

  it('should format hours, minutes and seconds', () => {
    expect(formatDuration(3600000)).toBe('1h')
    expect(formatDuration(3661000)).toBe('1h 1m 1s')
  })

  it('should format days, hours, minutes and seconds', () => {
    expect(formatDuration(86400000)).toBe('1d')
    expect(formatDuration(90061000)).toBe('1d 1h 1m 1s')
  })
})

describe('calculatePercentilesFromHistogram', () => {
  it('should return zero for empty histogram', () => {
    const result = calculatePercentilesFromHistogram([])
    expect(result.p95).toBe(0)
  })

  it('should return valid p95 for typical distribution', () => {
    const result = calculatePercentilesFromHistogram([10, 20, 30, 20, 10, 10])
    expect(result.p95).toBeGreaterThan(0)
    expect(result.p95).toBeGreaterThanOrEqual(result.p50)
  })

  it('should return consistent p95 for same input', () => {
    const histogram = [10, 20, 30, 20, 10, 10]
    const result1 = calculatePercentilesFromHistogram(histogram)
    const result2 = calculatePercentilesFromHistogram(histogram)
    expect(result1.p95).toBe(result2.p95)
  })
})