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

import {
  FIELD_STAMP_MAX_SPRITES,
  decimateFieldStampPoints,
  fieldStampMinSpacingN,
} from './fieldEffectStampPoints';
import type { NPoint } from './types/effects';

function pt(x: number, y: number, tMs = 0): NPoint {
  return { x, y, tMs };
}

void test('decimateFieldStampPoints: пустой и одна точка', () => {
  assert.deepEqual(decimateFieldStampPoints([], 0.05), []);
  const one = [pt(0.2, 0.3)];
  assert.deepEqual(decimateFieldStampPoints(one, 0.05), one);
});

void test('decimateFieldStampPoints: оставляет концы и выкидывает близкие середины', () => {
  const points = [pt(0, 0.5), pt(0.01, 0.5), pt(0.02, 0.5), pt(0.5, 0.5), pt(0.51, 0.5), pt(1, 0.5)];
  const out = decimateFieldStampPoints(points, 0.1);
  assert.equal(out[0]?.x, 0);
  assert.equal(out[out.length - 1]?.x, 1);
  assert.ok(out.length < points.length);
  assert.ok(out.length >= 3);
});

void test('decimateFieldStampPoints: maxPoints режет длинный штрих', () => {
  const points: NPoint[] = [];
  for (let i = 0; i <= 200; i += 1) {
    points.push(pt(i / 200, 0.4, i));
  }
  const out = decimateFieldStampPoints(points, 0.001, 16);
  assert.ok(out.length <= 16);
  assert.equal(out[0]?.x, 0);
  assert.equal(out[out.length - 1]?.x, 1);
});

void test('fieldStampMinSpacingN: огонь реже тумана', () => {
  const r = 0.04;
  assert.ok(fieldStampMinSpacingN('fire', r) > fieldStampMinSpacingN('fog', r));
  assert.ok(fieldStampMinSpacingN('fog', r) >= 0.006);
  assert.equal(FIELD_STAMP_MAX_SPRITES, 40);
});