import { describe, expect, it } from 'vitest'

import { computeKeyboardInset } from '@/lib/visualViewportKeyboardInset'

describe('computeKeyboardInset', () => {
  it('returns 0 when visual viewport matches the layout viewport', () => {
    expect(computeKeyboardInset(800, 800, 0)).toBe(0)
  })

  it('ignores small chrome/zoom deltas below the keyboard threshold', () => {
    expect(computeKeyboardInset(800, 760, 0)).toBe(0)
  })

  it('returns the occluded height when a keyboard-sized inset appears', () => {
    expect(computeKeyboardInset(800, 480, 0)).toBe(320)
  })

  it('subtracts visualViewport.offsetTop (iOS scroll-while-focused)', () => {
    expect(computeKeyboardInset(800, 480, 40)).toBe(280)
  })
})