import { describe, expect, it } from "vitest";
import { formatTimecode, parseTimecode } from "./timecode";

describe("formatTimecode", () => {
  it("is m:ss.d below an hour and h:mm:ss.d from one", () => {
    expect(formatTimecode(12.44)).toBe("0:12.4");
    expect(formatTimecode(75)).toBe("1:15.0");
    expect(formatTimecode(3723.4)).toBe("1:02:03.4");
  });

  it("shows hours when the item reaches one, so an item's fields agree", () => {
    expect(formatTimecode(65, true)).toBe("0:01:05.0");
  });

  it("carries a rounded tenth into the next second, never a 60.0", () => {
    expect(formatTimecode(59.96)).toBe("1:00.0");
  });

  it("reads a bad clock as zero", () => {
    expect(formatTimecode(NaN)).toBe("0:00.0");
    expect(formatTimecode(-3)).toBe("0:00.0");
  });
});

describe("parseTimecode", () => {
  it("reads every shape it writes, and bare seconds", () => {
    expect(parseTimecode("0:12.4")).toBeCloseTo(12.4);
    expect(parseTimecode("1:02:03.4")).toBeCloseTo(3723.4);
    expect(parseTimecode(" 90.5 ")).toBeCloseTo(90.5);
  });

  it("takes a decimal comma, in the seconds only", () => {
    expect(parseTimecode("1:02,5")).toBeCloseTo(62.5);
    expect(parseTimecode("12,4")).toBeCloseTo(12.4);
  });

  it("is null for what is not a timecode", () => {
    for (const v of ["", "abc", "1::2", "1:2:3:4", "-5", "1:-2", "1,5:00", "1:02,5,5"])
      expect(parseTimecode(v)).toBeNull();
  });
});