/** Sizes and durations in the words a person reads: pin each ladder's rungs,
 * because the debug page and the admin screens render these directly. */

import { expect } from "@std/expect";
import { describe, it as test } from "@std/testing/bdd";
import {
  countLabel,
  durationWords,
  formatBytes,
  formatLimitValue,
  formatMs,
  formatSeconds,
} from "#shared/format-units.ts";

describe("format-units", () => {
  test("bytes name the biggest rung they reach, else the bare count", () => {
    expect(formatBytes(0)).toBe("0B");
    expect(formatBytes(999)).toBe("999B");
    expect(formatBytes(1024)).toBe("1KB");
    expect(formatBytes(1048576)).toBe("1MB");
    expect(formatBytes(32 * 1024 * 1024)).toBe("32MB");
  });

  test("milliseconds climb from seconds through minutes to hours", () => {
    expect(formatMs(500)).toBe("500ms");
    expect(formatMs(1000)).toBe("1s");
    expect(formatMs(60 * 1000)).toBe("1min");
    expect(formatMs(60 * 60 * 1000)).toBe("1h");
  });

  test("seconds climb from minutes through hours to days", () => {
    expect(formatSeconds(59)).toBe("59s");
    expect(formatSeconds(60)).toBe("1min");
    expect(formatSeconds(3600)).toBe("1h");
    expect(formatSeconds(24 * 60 * 60)).toBe("1d");
  });

  test("a value rounding onto a rung rounds to a whole rung", () => {
    expect(formatSeconds(90)).toBe("2min");
  });

  test("a limit value reads its unit's ladder, or the plain count", () => {
    expect(formatLimitValue(1024, "bytes")).toBe("1KB");
    expect(formatLimitValue(3600, "seconds")).toBe("1h");
    expect(formatLimitValue(60, "ms")).toBe("60ms");
    expect(formatLimitValue(5, "attempts")).toBe("5 attempts");
    // A unit that names an inherited Object member is still an unknown unit.
    expect(formatLimitValue(5, "toString")).toBe("5 toString");
  });

  test("duration words read whole hours in hours", () => {
    expect(durationWords(3600)).toBe("an hour");
    expect(durationWords(2 * 3600)).toBe("2 hours");
    expect(durationWords(24 * 3600)).toBe("24 hours");
  });

  test("duration words read every other window in minutes or seconds", () => {
    expect(durationWords(60)).toBe("a minute");
    expect(durationWords(15 * 60)).toBe("15 minutes");
    expect(durationWords(90 * 60)).toBe("90 minutes");
    expect(durationWords(90)).toBe("90 seconds");
  });

  test("a count label stays singular on one and names every other count", () => {
    // The restore summary shape: multi-word nouns, several counts in a row.
    expect(countLabel(1, "SQL statement")).toBe("1 SQL statement");
    expect(countLabel(2, "SQL statement")).toBe("2 SQL statements");
    expect(countLabel(0, "table")).toBe("0 tables");
    // The activity-log shape: a counted choice update.
    expect(countLabel(1, "listing choice")).toBe("1 listing choice");
    expect(countLabel(4, "listing choice")).toBe("4 listing choices");
  });
});