import * as THREE from 'three';
import { describe, expect, it } from 'vitest';
import { buildPier } from '../src/core/geometry';
import type { TerrainGrid } from '../src/core/ground-model';
import { buildPierScene } from '../src/view/scene';
import { loadP1 } from './helpers';

const model = buildPier(loadP1());

const terrain: TerrainGrid = { origin: [259815.676, 179088.094], step: 5, nx: 2, ny: 2, z: [30, 31, 32, 33] };

describe('지반 표시 (지형 모델이 없을 때)', () => {
  it('draws a thin ground-level line at the pier 지반고, not a 60 m square', () => {
    const scene = buildPierScene(model);
    const box = new THREE.Box3().setFromObject(scene.parts.ground);
    const size = box.getSize(new THREE.Vector3());
    // Thin: a line, not a plane. Centred on the ground EL.
    expect(size.y).toBeLessThan(0.1);
    expect(box.getCenter(new THREE.Vector3()).y).toBeCloseTo(model.groundEl, 2);
    // Spans the coping along the pier, plus a small margin. The line may be rotated to the 교축, so measure its
    // horizontal extent as a diagonal of the box's x and z extents.
    const plan = Math.hypot(size.x, size.z);
    expect(plan).toBeGreaterThan(model.copingL);
    expect(plan).toBeLessThan(model.copingL + 3);
  });

  it('keeps the ground group out of the pier size', () => {
    const scene = buildPierScene(model);
    expect(scene.size).toBeLessThan(60);
  });

  it('does not draw the line when the terrain grid is present (the terrain replaces it)', () => {
    const scene = buildPierScene(model, terrain);
    expect(scene.parts.ground.children.length).toBe(1);
    const mesh = scene.parts.ground.children[0] as THREE.Mesh;
    expect(mesh.geometry.type).toBe('BufferGeometry');
  });
});