import { describe, expect, it } from 'vitest';
import { buildPier, blockFramePoint } from '../src/core/geometry';
import { loadP1 } from './helpers';

const model = buildPier(loadP1());
const front = model.blocks.filter((b) => b.row === '전열');
const back = model.blocks.filter((b) => b.row === '후열');

describe('받침블럭 방위 (삽도 · 승인 2026-10-23)', () => {
  it('P1 rows are skewed by the bearing azimuth against the axis perpendicular: front ≈ −4.42°, back ≈ −3.11°', () => {
    expect(front.every((b) => Math.abs(b.rowSkewDeg - -4.42) < 0.02)).toBe(true);
    expect(back.every((b) => Math.abs(b.rowSkewDeg - -3.11) < 0.02)).toBe(true);
  });

  it('a block side follows the bearing row: the n side of a block runs along (−sinδ, cosδ)', () => {
    const b = front[0];
    const [s1, n1] = blockFramePoint(b, 0, -0.6);
    const [s2, n2] = blockFramePoint(b, 0, 0.6);
    const ds = s2 - s1;
    const dn = n2 - n1;
    const len = Math.hypot(ds, dn);
    const d = (b.rowSkewDeg * Math.PI) / 180;
    expect(ds / len).toBeCloseTo(-Math.sin(d), 9);
    expect(dn / len).toBeCloseTo(Math.cos(d), 9);
  });

  it('turning keeps the block centre and the bearing spacing (the row is unchanged)', () => {
    const b = front[0];
    const [s0, n0] = blockFramePoint(b, 0, 0);
    expect(s0).toBeCloseTo(b.s, 12);
    expect(n0).toBeCloseTo(b.n, 12);
  });

  it('the turned block corners stay inside the coping ends', () => {
    const L = model.copingL;
    for (const b of model.blocks) {
      for (const [a, c] of [[-0.6, -0.6], [-0.6, 0.6], [0.6, -0.6], [0.6, 0.6]] as const) {
        const [s] = blockFramePoint(b, a, c);
        expect(s, `block ${b.no}`).toBeGreaterThan(0);
        expect(s, `block ${b.no}`).toBeLessThan(L);
      }
    }
  });
});