import * as THREE from 'three';
import { describe, expect, it } from 'vitest';
import { buildPier, type PierModel } from '../src/core/geometry';
import { buildAllPiers, pierOffset } from '../src/view/all-piers';
import { loadP1 } from './helpers';

const model = buildPier(loadP1());

describe('pierOffset', () => {
  it('is zero for the reference pier', () => {
    expect(pierOffset(model.pivot, model.pivot)).toEqual({ x: 0, z: 0 });
  });

  it('moves east by the E difference and north by the N difference (z = −N)', () => {
    const ref = { e: 259865, n: 179138 };
    const other = { e: 260117, n: 179177 };
    expect(pierOffset(other, ref)).toEqual({ x: 252, z: -39 });
  });
});

describe('buildAllPiers', () => {
  it('places a pier at the same world box whatever pivot it is built around', () => {
    // The same pier with its pivot shifted: the geometry shifts by the opposite amount, so the world box must not change.
    const shifted: PierModel = { ...model, pivot: { e: model.pivot.e + 50, n: model.pivot.n - 20 } };
    const all = buildAllPiers([{ name: 'P1', model }, { name: 'P2', model: shifted }]);
    all.piers.updateMatrixWorld(true);
    const a = new THREE.Box3().setFromObject(all.scenes.get('P1')!.root);
    const b = new THREE.Box3().setFromObject(all.scenes.get('P2')!.root);
    // Float32 geometry: allow 0.1 mm.
    expect(b.min.distanceTo(a.min)).toBeLessThan(1e-4);
    expect(b.max.distanceTo(a.max)).toBeLessThan(1e-4);
  });

  it('keeps each pier 지반고 line without terrain, and hides it when the shared terrain is drawn', () => {
    const without = buildAllPiers([{ name: 'P1', model }]);
    expect([...without.scenes.keys()]).toEqual(['P1']);
    expect(without.scenes.get('P1')!.parts.ground.visible).toBe(true);
    expect(without.terrain).toBeNull();
    expect(without.view.size).toBeGreaterThan(0);

    const withTerrain = buildAllPiers([{ name: 'P1', model }], { origin: [259815.676, 179088.094], step: 5, nx: 2, ny: 2, z: [30, 31, 32, 33] });
    expect(withTerrain.scenes.get('P1')!.parts.ground.visible).toBe(false);
    expect(withTerrain.terrain).not.toBeNull();
  });

  it('keeps pier ground pads visible when the imported terrain grid has no complete cells', () => {
    const all = buildAllPiers([{ name: 'P1', model }], {
      origin: [259815.676, 179088.094],
      step: 5,
      nx: 2,
      ny: 2,
      z: [null, null, null, null],
    });
    expect(all.terrain).toBeNull();
    expect(all.scenes.get('P1')!.parts.ground.visible).toBe(true);
  });

  it('uses the imported ground elevation for each pier fallback pad', () => {
    const all = buildAllPiers([{ name: 'P1', model, groundEl: 31.25 }]);
    const pad = all.scenes.get('P1')!.parts.ground.children[0] as THREE.Mesh;
    pad.geometry.computeBoundingBox();
    expect(pad.geometry.boundingBox!.getCenter(new THREE.Vector3()).y).toBeCloseTo(31.25, 5);
  });
});