import { expect, it } from "vitest";
import { DEFAULT_GROUND_COLOR, type SceneSettings } from "../schema/directorProject";
import { getSceneGroupTransform } from "./sceneTransform";

function createScene(patch: Partial<SceneSettings> = {}): SceneSettings {
  return {
    scale: 1,
    position: [0, 0, 0],
    rotation: [0, 0, 0],
    backgroundColor: "#000000",
    panoramaYaw: 0,
    panoramaRadius: 60,
    showLabels: true,
    captureShowGrid: false,
    snapToGrid: false,
    showGround: true,
    groundColor: DEFAULT_GROUND_COLOR,
    groundOpacity: 0.4,
    groundHeight: 0,
    ...patch,
  };
}

it("maps the scene scale onto all three axes", () => {
  expect(getSceneGroupTransform(createScene({ scale: 2.5 }))).toEqual({
    position: [0, 0, 0],
    rotation: [0, 0, 0],
    scale: [2.5, 2.5, 2.5],
  });
});

it("converts the scene rotation from degrees to radians for the Three.js group", () => {
  const transform = getSceneGroupTransform(createScene({ position: [1, 3, -2], rotation: [0, 90, 180] }));

  expect(transform.position).toEqual([1, 3, -2]);
  expect(transform.rotation[0]).toBeCloseTo(0);
  expect(transform.rotation[1]).toBeCloseTo(Math.PI / 2);
  expect(transform.rotation[2]).toBeCloseTo(Math.PI);
  expect(transform.scale).toEqual([1, 1, 1]);
});

it("keeps the ground plane and the viewport grid on the same world height", () => {
  const scene = createScene({ scale: 1.5, position: [0, 2, 0], groundHeight: 1.2 });
  const transform = getSceneGroupTransform(scene);
  const gridElevation = 0.002;

  // 地面：局部 y = groundHeight；网格：局部 y = groundHeight + 抬升
  // 两者共用同一个场景组 → 世界高度只差 抬升 × 场景缩放，永远不会分叉成两层地面
  const groundWorldY = transform.position[1] + scene.groundHeight * transform.scale[1];
  const gridWorldY = transform.position[1] + (scene.groundHeight + gridElevation) * transform.scale[1];

  expect(gridWorldY - groundWorldY).toBeCloseTo(gridElevation * scene.scale, 6);
});