import assert from 'node:assert/strict'
import test from 'node:test'

import { preserveAnnotationScreenPositions } from '../src/utils/annotationGeometry.ts'

test('keeps annotation points at the same screen position when the origin moves', () => {
  const annotations = [
    { points: [{ x: 30, y: 40 }, { x: 80, y: 90 }] },
    { points: [{ x: 12, y: 18 }] },
  ]

  preserveAnnotationScreenPositions(
    annotations,
    { x: 100, y: 200 },
    { x: 125, y: 230 }
  )

  assert.deepEqual(annotations, [
    { points: [{ x: 5, y: 10 }, { x: 55, y: 60 }] },
    { points: [{ x: -13, y: -12 }] },
  ])
  assert.deepEqual(
    annotations[0].points.map((point) => ({
      x: 125 + point.x,
      y: 230 + point.y,
    })),
    [{ x: 130, y: 240 }, { x: 180, y: 290 }]
  )
})

test('does not move annotations when only the right or bottom edge changes', () => {
  const annotations = [{ points: [{ x: 30, y: 40 }] }]

  preserveAnnotationScreenPositions(
    annotations,
    { x: 100, y: 200 },
    { x: 100, y: 200 }
  )

  assert.deepEqual(annotations, [{ points: [{ x: 30, y: 40 }] }])
})

test('preserves screen positions across repeated drags and an edge crossover', () => {
  const annotations = [{ points: [{ x: 50, y: 60 }] }]

  preserveAnnotationScreenPositions(
    annotations,
    { x: 100, y: 100 },
    { x: 140, y: 130 }
  )
  preserveAnnotationScreenPositions(
    annotations,
    { x: 140, y: 130 },
    { x: 300, y: 150 }
  )

  assert.deepEqual(annotations, [{ points: [{ x: -150, y: 10 }] }])
  assert.deepEqual(
    {
      x: 300 + annotations[0].points[0].x,
      y: 150 + annotations[0].points[0].y,
    },
    { x: 150, y: 160 }
  )
})