const test = require('node:test');
const assert = require('node:assert/strict');

const { reverseCurve } = require('../../src/curves/reverseCurve');

test('reverseCurve: swaps x and y for each pressure key', () => {
  const input = {
    700: { x: [0, 50, 100], y: [0, 10, 20] },
    800: { x: [0, 50, 100], y: [0, 11, 22] },
  };
  const out = reverseCurve(input);
  assert.deepEqual(out['700'].x, [0, 10, 20]);
  assert.deepEqual(out['700'].y, [0, 50, 100]);
  assert.deepEqual(out['800'].x, [0, 11, 22]);
  assert.deepEqual(out['800'].y, [0, 50, 100]);
});

test('reverseCurve: returns a fresh object with cloned arrays', () => {
  const input = { 700: { x: [1, 2], y: [3, 4] } };
  const out = reverseCurve(input);
  out['700'].x.push(999);
  assert.deepEqual(input['700'].x, [1, 2]);
  assert.deepEqual(input['700'].y, [3, 4]);
});

test('reverseCurve: handles empty input', () => {
  assert.deepEqual(reverseCurve({}), {});
  assert.deepEqual(reverseCurve(null), {});
});