import { describe, expect, it } from 'vitest';
import { buildPier } from '../src/core/geometry';
import { loadP1 } from './helpers';
import { adjustRow, defaultRowCounts, layoutText, maxCount, resolveRowCounts, rowLayout, totalPiles, type PileGeometry } from '../src/core/piles';

// Footing 10400 × 8150, pile end 700, minimum centre spacing 2250 (spec §4.6, §3).
const G: PileGeometry = { footingLength: 10.4, footingWidth: 8.15, end: 0.7, minSpacing: 2.25 };

describe('말뚝 열별 본수 (spec §4.6, plan C4)', () => {
  it('defaults give 4 열 × 5 본 = 20 for the P1 footing, and the 1단계 text is kept', () => {
    expect(defaultRowCounts(G)).toEqual([5, 5, 5, 5]);
    expect(totalPiles(defaultRowCounts(G))).toBe(20);
    expect(layoutText(defaultRowCounts(G), G)).toBe('4@2250 × 3@2250 = 20본');
  });

  it('a 열 with 6 본 gives 5 gaps at 1800 mm, as in the plan (warning, not refused)', () => {
    const counts = adjustRow(defaultRowCounts(G), 0, 1);
    expect(counts[0]).toBe(6);
    const layout = rowLayout(counts, G);
    expect(Math.round(layout[0].spacing * 1000)).toBe(1800);
    expect(layout[0].belowMinimum).toBe(true);
    expect(layout[1].belowMinimum).toBe(false);
    expect(layoutText(counts, G)).toBe('열1 5@1800 · 열2 4@2250 · 열3 4@2250 · 열4 4@2250 = 21본');
  });

  it('the total follows the counts: − and + change it by one per 열', () => {
    expect(totalPiles(adjustRow(defaultRowCounts(G), 2, -1))).toBe(19);
    expect(totalPiles(adjustRow(defaultRowCounts(G), 2, 1))).toBe(21);
  });

  it('counts are kept within the limits when adjusting', () => {
    expect(adjustRow([2, 2, 2, 2], 0, -1)[0]).toBe(2);
    expect(adjustRow([30, 2, 2, 2], 0, 1)[0]).toBe(30);
  });

  it('refuses a wrong number of 열 and a count that is not a whole number in range', () => {
    expect(() => resolveRowCounts([5, 5, 5], G)).toThrow('4개여야');
    expect(() => resolveRowCounts([5, 5, 1, 5], G)).toThrow('2–30');
    expect(() => resolveRowCounts([5, 5, 5.5, 5], G)).toThrow('정수');
    expect(resolveRowCounts([6, 5, 5, 5], G)).toEqual([6, 5, 5, 5]);
  });

  it('the default count matches the spec formula floor((L − 1400) / 2250) + 1', () => {
    expect(maxCount(10.4, G)).toBe(5);
    expect(maxCount(17.6, G)).toBe(8);
  });
});

describe('열별 본수 in the model (spec §4.6)', () => {
  it('buildPier uses the per-row counts: 6 + 5 + 5 + 5 = 21 piles, and the text follows', () => {
    const p1 = loadP1();
    const m = buildPier({ ...p1, pileRows: [6, 5, 5, 5] });
    expect(m.piles).toHaveLength(21);
    expect(m.derived.pileLayout).toBe('열1 5@1800 · 열2 4@2250 · 열3 4@2250 · 열4 4@2250 = 21본');
  });

  it('absent 열별 본수 gives the 1단계 result: 20 piles', () => {
    expect(buildPier(loadP1()).piles).toHaveLength(20);
  });

  it('a wrong number of 열 is refused by buildPier', () => {
    expect(() => buildPier({ ...loadP1(), pileRows: [5, 5, 5] })).toThrow('4개여야');
  });
});