import { describe, it, expect } from "vitest";
import { formatDecimal, formatNumber, formatPercent, formatQtyDual } from "./utils";

describe("formatQtyDual", () => {
  it("shows both figures when a conversion happened", () => {
    expect(formatQtyDual(29.96, "ton", 29960, "kg")).toBe(
      `${formatNumber(29.96)} ton · ${formatNumber(29960)} kg`,
    );
  });

  it("shows one figure when the units match", () => {
    expect(formatQtyDual(5, "ton", 5, "ton")).toBe("5 ton");
  });

  it("shows one figure when the slip recorded no unit", () => {
    expect(formatQtyDual(5, "ton", 5, "")).toBe("5 ton");
  });

  it("omits the unit entirely when the PO line has none", () => {
    expect(formatQtyDual(5, "", 5, "")).toBe("5");
  });

  it("falls back to the raw figure when nothing converted", () => {
    expect(formatQtyDual(0, "ton", 12, "m3")).toBe("0 ton · 12 m3");
  });
});

// en-ZA everywhere a person reads a number: comma decimal, space
// thousands. Mixing toFixed ("38.7%") with Intl ("61,3%") on one card
// was the bug these pin.
describe("formatPercent", () => {
  it("uses the en-ZA decimal comma", () => {
    expect(formatPercent(38.66)).toBe("38,7%");
  });

  it("keeps trailing zeros so a column lines up", () => {
    expect(formatPercent(12, 1)).toBe("12,0%");
  });

  it("rounds to whole percent when asked", () => {
    expect(formatPercent(7.4, 0)).toBe("7%");
  });

  it("signs a variance when asked", () => {
    expect(formatPercent(4.25, 1, { signed: true })).toBe("+4,3%");
    expect(formatPercent(-99.6, 1, { signed: true })).toBe("-99,6%");
    expect(formatPercent(0, 1, { signed: true })).toBe("0,0%");
  });
});

describe("formatDecimal", () => {
  it("fixes the digits and uses en-ZA separators", () => {
    expect(formatDecimal(0.07, 2)).toBe("0,07");
    expect(formatDecimal(1234.5, 1)).toBe(formatNumber(1234.5, { minimumFractionDigits: 1, maximumFractionDigits: 1 }));
  });
});