import { describe, expect, it } from 'vitest';
import { buildPier } from '../src/core/geometry';
import { barsAcross, bearingBlockRebar, blockBars, totals } from '../src/core/rebar/bearing-block';
import { loadP1 } from './helpers';

describe('받침블럭 철근 (spec §6.3, plan C2)', () => {
  it('a 1200 block takes 8 bars at 125 mm: 7 gaps = 875, ends 162.5 each', () => {
    const a = barsAcross(1200);
    expect(a.count).toBe(8);
    expect(a.spacing).toBe(125);
    expect((a.count - 1) * a.spacing).toBe(875);
    expect(a.firstEnd).toBeCloseTo(162.5, 6);
  });

  it('each bar is 1100 + 700 × 2 = 2500 mm long', () => {
    for (const bar of blockBars(150)) expect(bar.length).toBe(2500);
  });

  it('coping embedment: S2 600 (front) / 550 (back), S1 619.1 (front) / 569.1 (back), as in the spec', () => {
    const front = blockBars(150);
    const back = blockBars(200);
    expect(front.find((b) => b.name === 'S2')!.embedment).toBeCloseTo(600, 6);
    expect(back.find((b) => b.name === 'S2')!.embedment).toBeCloseTo(550, 6);
    expect(front.find((b) => b.name === 'S1')!.embedment).toBeCloseTo(619.1, 6);
    expect(back.find((b) => b.name === 'S1')!.embedment).toBeCloseTo(569.1, 6);
  });

  it('P1: 10 blocks, 80 bars each of S1 and S2 (spec table: 8 本 per block)', () => {
    const m = buildPier(loadP1());
    const rebar = bearingBlockRebar(m);
    expect(rebar).toHaveLength(10);
    expect(totals(rebar)).toEqual({ S1: 80, S2: 80 });
  });
});

describe('받침블럭 도면 재현 (spec §6.3)', () => {
  it('integrated block 2500 × 1200: 18@125 = 2250 along (ends 50 + 75), 7@125 = 875 across (ends 50 + 113 ≈ 162.5)', () => {
    const along = barsAcross(2500);
    expect(along.spacing).toBe(125);
    expect(along.count - 1).toBe(18);
    expect((along.count - 1) * along.spacing).toBe(2250);
    expect(along.firstEnd).toBeCloseTo(125, 6);

    const across = barsAcross(1200);
    expect(across.count - 1).toBe(7);
    expect((across.count - 1) * across.spacing).toBe(875);
    expect(across.firstEnd).toBeCloseTo(162.5, 6); // 50 + 75 + 37.5, printed as 50 + 113 in the drawing
  });
});