import { describe, expect, it } from "vitest";
import { readSpreadsheet } from "@/infra/spreadsheet/parse";
import { buildCsv, buildXlsx } from "@/infra/export/tabular";

function csv(rows: number): Buffer {
  const lines = ["Nome,Valor"];
  for (let index = 0; index < rows; index += 1) lines.push(`Pessoa ${index},${index}`);
  return Buffer.from(lines.join("\n"), "utf8");
}

async function measure(rows: number) {
  const bytes = csv(rows);
  const started = performance.now();
  const parsed = await readSpreadsheet("amostra.csv", bytes);
  const readMs = performance.now() - started;
  const writeStarted = performance.now();
  buildCsv(parsed.grid.headers, parsed.grid.rows);
  const csvMs = performance.now() - writeStarted;
  const xlsxStarted = performance.now();
  await buildXlsx(parsed.grid.headers, parsed.grid.rows);
  const xlsxMs = performance.now() - xlsxStarted;
  return { rows, readMs, csvMs, xlsxMs, heapMb: Math.round(process.memoryUsage().heapUsed / 1024 / 1024) };
}

describe("baseline de planilha", () => {
  it("mede leitura e escrita em amostra pequena e média", async () => {
    const small = await measure(200);
    const medium = await measure(5_000);
    expect(small.readMs).toBeLessThan(5_000);
    expect(medium.readMs).toBeLessThan(15_000);
    expect(medium.xlsxMs).toBeLessThan(30_000);
    expect(small.rows).toBe(200);
  });
});