import assert from 'node:assert/strict'
import test from 'node:test'
import {
  clampOverlayTransform,
  fitDisplayDimensions,
  positionInCorner,
} from '../src/utils/editorMath.ts'

test('fitDisplayDimensions keeps source coordinates independent from display size', () => {
  assert.deepEqual(fitDisplayDimensions({ width: 4032, height: 3024 }, 900), {
    width: 900,
    height: 675,
  })
  assert.deepEqual(fitDisplayDimensions({ width: 800, height: 600 }, 1200), {
    width: 800,
    height: 600,
  })
})

test('clampOverlayTransform keeps the full overlay inside the source image', () => {
  const result = clampOverlayTransform(400, 200, 950, -50, 0.5, {
    width: 1000,
    height: 500,
  })

  assert.equal(result.scale, 0.5)
  assert.equal(result.width, 200)
  assert.equal(result.height, 100)
  assert.equal(result.x, 800)
  assert.equal(result.y, 0)
})

test('clampOverlayTransform limits oversized overlays without changing aspect ratio', () => {
  const result = clampOverlayTransform(2000, 1000, 0, 0, 1, {
    width: 1000,
    height: 400,
  })

  assert.equal(result.scale, 0.4)
  assert.equal(result.width, 800)
  assert.equal(result.height, 400)
})

test('positionInCorner uses a proportional margin and does not clip the object', () => {
  const position = positionInCorner(
    'bottom-right',
    { width: 200, height: 100 },
    { width: 1000, height: 500 },
  )

  assert.equal(position.x, 787.5)
  assert.equal(position.y, 387.5)
})