import * as XLSX from 'xlsx';
import { describe, expect, it } from 'vitest';
import { buildTemplateWorkbook } from '../src/core/template';
import { parseWorkbook } from '../src/core/parseWorkbook';

describe('input template (명세 §2.3 ④)', () => {
  const wb = buildTemplateWorkbook();

  it('has the three sheets 교각, IP, 받침 in that order', () => {
    expect(wb.SheetNames).toEqual(['교각', 'IP', '받침']);
  });

  it('is recognised by the parser: each sheet has its table and no errors', () => {
    const { piers, issues, sheets } = parseWorkbook(wb);
    expect(piers).toEqual([]);
    expect(issues).toEqual([]);
    expect(sheets.map((s) => [s.name, s.tables])).toEqual([
      ['교각', { pier: 1, ip: 0, bearing: 0 }],
      ['IP', { pier: 0, ip: 1, bearing: 0 }],
      ['받침', { pier: 0, ip: 0, bearing: 1 }],
    ]);
  });

  it('round-trips through a file: written and re-read the same way', () => {
    const bytes = XLSX.write(wb, { type: 'array', bookType: 'xlsx' }) as ArrayBuffer;
    const back = XLSX.read(new Uint8Array(bytes), { type: 'array' });
    expect(back.SheetNames).toEqual(['교각', 'IP', '받침']);
    expect(parseWorkbook(back).issues).toEqual([]);
  });
});