import { describe, expect, it } from 'vitest';
import { buildPier } from '../src/core/geometry';
import { c14Bars, c14Length, copingSideBars, tStepBars, undersideAt } from '../src/core/rebar/coping';
import { loadP1 } from './helpers';

const m = buildPier(loadP1());
const L = m.copingL * 1000;
const B = m.copingB * 1000;
const side = copingSideBars(L, 41.288, 42.538);
const rows = [...side.c13, ...side.c12];
const under = (x: number) => undersideAt(L, x, m.endBottom, m.levelBottom);

describe('C14 / C15 / C16 (코핑철근.md §7–8)', () => {
  it('C14: 2 upper lines of 11 (C2, C3) and lower rows 5 / 6 / 3 / 2 = 38', () => {
    const bars = c14Bars(L, m.copingRefTop, rows, under);
    const count = (line: number) => bars.filter((b) => b.line === line).length;
    expect(count(1)).toBe(11);
    expect(count(2)).toBe(11);
    expect([3, 4, 5, 6].map(count)).toEqual([5, 6, 3, 2]);
    expect(bars.length).toBe(38);
  });

  it('C14 heights: upper 43.208 / 43.108, lower 42.810 / 42.310 / 41.810 / 41.310 (상면 단 간격 100)', () => {
    const bars = c14Bars(L, m.copingRefTop, rows, under);
    const z = (line: number) => bars.find((b) => b.line === line)!.z;
    expect(z(1)).toBeCloseTo(43.208, 3);
    expect(z(2)).toBeCloseTo(43.108, 3);
    expect([3, 4, 5, 6].map(z)).toEqual([42.81, 42.31, 41.81, 41.31].map((v) => expect.closeTo(v, 2)));
  });

  it('C14 length 3447.5 (2855.5 run + 2 × 296 legs)', () => {
    expect(c14Length(B)).toBeCloseTo(3447.5, 0);
  });

  // P1 문서값 (§7) = 일반 규칙의 기준 (결정 2026-11-10): 모델의 계단 72/144/215/287 → C15 5구간, C16 3·4구간.
  const steps = tStepBars(m).bars;
  const c15 = steps.filter((b) => b.name === 'C15');
  const c16 = steps.filter((b) => b.name === 'C16');

  it('C15: 11 bars, z 43.598, length 3852 (2088 + 2 × 882), from 9.812 to 11.900', () => {
    expect(c15.length).toBe(11);
    expect(c15[0].z).toBeCloseTo(43.598, 3);
    expect(c15[0].length).toBe(3852);
    expect([c15[0].x0, c15[0].x1]).toEqual([9812, 11900]);
  });

  it('C16: 22 bars (3·4구간), z 43.436 / 43.507, lengths 4070 / 4069, leg at the low side', () => {
    expect(c16.length).toBe(22);
    expect(c16[0].z).toBeCloseTo(43.436, 3);
    expect(c16[11].z).toBeCloseTo(43.507, 3);
    expect(c16[0].length).toBe(4070);
    expect(c16[11].length).toBe(4069);
    expect([c16[0].x0, c16[0].x1, c16[11].x0, c16[11].x1]).toEqual([4801, 7989, 7307, 10494]);
    expect(c16.every((b) => b.legs === 'start')).toBe(true);
  });

  it('C15 / C16 across positions: 137.5 from the cover line (문서 137), then @250, 11 bars', () => {
    expect(c15[0].n * 1000).toBeCloseTo(-B / 2 + 237.5, 6);
    expect((c15[10].n - c15[0].n) * 1000).toBeCloseTo(2500, 6);
  });
});

describe('C14 연직 발 (코핑철근.md §8)', () => {
  it('upper lines keep their legs; a lower bar keeps its legs only if they end above the underside', () => {
    const bars = c14Bars(L, m.copingRefTop, rows, under);
    expect(bars.filter((b) => b.line <= 2).every((b) => b.legs)).toBe(true);
    // The leg of the C12 5단 bar (line 4) at the ends (x 1 m, 11 m) would end below the sloped underside, so it is left out.
    const omitted = bars.filter((b) => !b.legs).map((b) => [b.line, Math.round(b.x / 1000)]);
    expect(omitted).toEqual([[4, 1], [4, 11]]);
  });
});

describe('C15 간격 = 2 × 주철근 기본간격 (승인 2026-10-26)', () => {
  it('the default pitch is 250, and a 140 기본간격 moves the C15 bars to 280', () => {
    const base = tStepBars(m).bars.filter((b) => b.name === 'C15');
    expect(Math.round((base[1].n - base[0].n) * 1000)).toBe(250);
    const wider = tStepBars(buildPier({ ...loadP1(), copingRebar: { mainSpacing: 140 } })).bars.filter((b) => b.name === 'C15');
    expect(Math.round((wider[1].n - wider[0].n) * 1000)).toBe(280);
  });
});