import { describe, expect, it } from 'vitest'
import { MIN_DURATION_MIN, SNAP_MIN, snap, snapClamp } from '@/lib/timetable/snap'

describe('snap', () => {
  it('rounds to nearest multiple of step', () => {
    expect(snap(0, 5)).toBe(0)
    expect(snap(2, 5)).toBe(0)
    expect(snap(3, 5)).toBe(5)
    expect(snap(7, 5)).toBe(5)
    expect(snap(8, 5)).toBe(10)
    expect(snap(12, 5)).toBe(10)
    expect(snap(13, 5)).toBe(15)
  })

  it('returns value unchanged when step <= 0', () => {
    expect(snap(7.3, 0)).toBe(7.3)
    expect(snap(7.3, -1)).toBe(7.3)
  })

  it('handles exact-multiple inputs', () => {
    expect(snap(15, 5)).toBe(15)
    expect(snap(60, 15)).toBe(60)
  })

  it('exposes the SNAP_MIN constant', () => {
    expect(SNAP_MIN).toBeGreaterThan(0)
    expect(SNAP_MIN).toBeLessThanOrEqual(15)
  })

  it('exposes MIN_DURATION_MIN', () => {
    expect(MIN_DURATION_MIN).toBe(15)
  })
})

describe('snapClamp', () => {
  it('snaps then clamps inside [min, max]', () => {
    expect(snapClamp(7, 5, 0, 100)).toBe(5)
    expect(snapClamp(-5, 5, 0, 100)).toBe(0)
    expect(snapClamp(150, 5, 0, 100)).toBe(100)
  })
})