import { describe, expect, it } from 'vitest';
import { buildPier, type BlockModel } from '../src/core/geometry';
import { bearingEdgeDistances, PAIR_ECCENTRICITY_LIMIT_MM, pairEccentricities } from '../src/core/bearing-layout';
import { loadP1 } from './helpers';

const model = buildPier(loadP1());

function block(no: number, row: '전열' | '후열', s: number): BlockModel {
  return { no, row, s, n: 0, k: 0, g: 0, bottom: 0, top: 0, padTop: 0, rowSkewDeg: 0 } as BlockModel;
}

describe('받침 배치 규칙 (승인 2026-10-26)', () => {
  it('C4 and C5 from the model: distances from each coping edge to the bearing centre (P1 ≈ 943 / 950 mm)', () => {
    const d = bearingEdgeDistances(model);
    expect(d).toHaveLength(10);
    const first = d.find((x) => x.no === 1 && x.row === '전열')!;
    expect(first.leftMm).toBeCloseTo(943, 0);
    expect(first.rightMm).toBeCloseTo(12000 - 943, 0);
    // the two ends of one bearing sum to the coping length
    for (const x of d) expect(x.leftMm + x.rightMm).toBeCloseTo(12000, 6);
  });

  it('the front and back bearings of one number are about 85 mm apart on P1, so 일체 is allowed', () => {
    const pairs = pairEccentricities(model.blocks);
    expect(pairs).toHaveLength(5);
    for (const p of pairs) {
      expect(p.eccentricityMm).toBeGreaterThan(80);
      expect(p.eccentricityMm).toBeLessThan(90);
      expect(p.allowed).toBe(true);
    }
  });

  it('an eccentricity above 100 mm forbids 일체 for that pair (분리 우선)', () => {
    expect(PAIR_ECCENTRICITY_LIMIT_MM).toBe(100);
    const pairs = pairEccentricities([block(1, '전열', 1.0), block(1, '후열', 1.12), block(2, '전열', 3), block(2, '후열', 3.09)]);
    expect(pairs.find((p) => p.frontNo === 1)!.allowed).toBe(false);
    expect(pairs.find((p) => p.frontNo === 2)!.allowed).toBe(true);
  });

  it('pairs by order within each row, so 전열 1 pairs with 후열 6 on P1 (numbers run on across the rows)', () => {
    const pairs = pairEccentricities(model.blocks);
    expect(pairs[0]).toMatchObject({ frontNo: 1, backNo: 6 });
  });

  it('a bearing left without a partner (the rows have different counts) is not paired', () => {
    expect(pairEccentricities([block(1, '전열', 1), block(2, '전열', 3), block(6, '후열', 1.05)])).toHaveLength(1);
  });
});