import { describe, expect, it } from 'vitest';
import { allVisibleChecked, checkedCount, selectableVisible, setVisibleChecked, type Selectable } from '../src/core/selection';
import type { PierType } from '../src/core/types';

const TYPES: PierType[] = ['T형', '2주형', '3주형'];

/** 20 piers: mixed types, and two that failed to build (model null). */
function twenty(): (Selectable & { name: string })[] {
  return Array.from({ length: 20 }, (_, i) => ({
    name: `P${i + 1}`,
    input: { type: TYPES[i % 3] },
    model: i === 4 || i === 13 ? null : {},
    checked: false,
  }));
}

describe('교각 목록 다중 선택 (spec §9, plan C6)', () => {
  it('전체 선택 acts on visible, buildable piers only', () => {
    const next = setVisibleChecked(twenty(), 'all', true);
    expect(checkedCount(next)).toBe(18);
    expect(next.find((p) => p.name === 'P5')!.checked).toBe(false);
  });

  it('the type filter limits 전체 선택 to that type', () => {
    const next = setVisibleChecked(twenty(), 'T형', true);
    const t = next.filter((p) => p.input.type === 'T형' && p.model !== null);
    expect(t.every((p) => p.checked)).toBe(true);
    expect(checkedCount(next)).toBe(t.length);
  });

  it('checks made under one filter survive a change of filter', () => {
    let piers = setVisibleChecked(twenty(), '2주형', true);
    const before = checkedCount(piers);
    piers = setVisibleChecked(piers, 'T형', false);
    expect(checkedCount(piers)).toBe(before);
  });

  it('the button reads 선택 해제 only when all selectable visible piers are checked', () => {
    let piers = setVisibleChecked(twenty(), '3주형', true);
    expect(allVisibleChecked(piers, '3주형')).toBe(true);
    expect(allVisibleChecked(piers, 'all')).toBe(false);
    piers = setVisibleChecked(piers, '3주형', false);
    expect(allVisibleChecked(piers, '3주형')).toBe(false);
  });

  it('a list of 20 piers keeps every selectable one', () => {
    expect(selectableVisible(twenty(), 'all')).toHaveLength(18);
  });
});