import { describe, expect, it } from "bun:test";

import { formatDatetime } from "../../src/web/shared/utils/format";

describe("formatDatetime", () => {
  it("formats ISO date string to YYYY-MM-DD HH:mm:ss", () => {
    expect(formatDatetime("2024-06-15T14:30:45.123Z")).toMatch(/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/);
  });

  it("pads single-digit month, day, hour, minute, second", () => {
    const result = formatDatetime("2024-01-05T09:08:07.000Z");
    expect(result).toMatch(/2024-0[1-9]-0[1-9] 0[0-9]:0[0-9]:0[0-9]/);
  });

  it("handles end-of-year date", () => {
    const result = formatDatetime("2024-12-31T23:59:59.000Z");
    expect(result).toContain("2024");
    expect(result).toContain("59:59");
  });

  it("produces consistent output format", () => {
    const result = formatDatetime("2024-06-15T14:30:45.123Z");
    expect(result.length).toBe(19);
  });
});