import { expect, test } from "vitest";
import toWords from "./toWords";

test.each([
  ["a", "a"],
  ["thing", "thing"],
  ["some_snake_case_thing", "some snake case thing"],
  ["Some_Caps_Snake_Case_Thing", "Some Caps Snake Case Thing"],
  ["SCREAMING_SNAKE_CASE_THING", "SCREAMING SNAKE CASE THING"],
  ["someCamelCaseThing", "some Camel Case Thing"],
  ["SomePascalCaseThing", "Some Pascal Case Thing"],
  ["some-kebab-case-thing", "some kebab case thing"],
  ["Some-Kebab-Case-Thing", "Some Kebab Case Thing"],
  ["SCREAMING-KEBAB-CASE-THING", "SCREAMING KEBAB CASE THING"],
  ["some spaced thing", "some spaced thing"],
  ["some-cursed mixOfThings_going_on", "some cursed mix Of Things going on"],
  ["downloadUrl", "download Url"],
  ["download_url", "download url"],
  ["download_Url", "download Url"],
  ["Download_Url", "Download Url"],
  ["downloadURL", "download URL"],
  ["DownloadURL", "Download URL"],
  ["XMLHttpRequest", "XML Http Request"],
  ["XmlHTTPRequest", "Xml HTTP Request"],
  ["someAI", "some AI"],
  ["SomeAI", "Some AI"],
  ["MP4Enabled", "MP4 Enabled"],
  ["mp4Enabled", "mp4 Enabled"],
  ["v2", "v2"],
  ["V2", "V2"],
  ["flagV2", "flag V2"],
  ["flag_V2", "flag V2"],
  ["flag_v2", "flag v2"],
  ["upgradeOn20230428", "upgrade On 20230428"],
  ["flagVersion2", "flag Version 2"],
  ["useHTTP2", "use HTTP2"],
  ["1234", "1234"],
  ["    spaced -_out -", "spaced out"],
])("%s -> %s", (input, expected) => {
  expect(toWords(input)).toEqual(expected.split(" "));
});

test("returns empty array for empty input", () => {
  expect(toWords("")).toEqual([]);
});

test("returns empty array for blank input", () => {
  expect(toWords("     ")).toEqual([]);
});

test("returns empty array for spacer-only input", () => {
  expect(toWords("   _  -- ")).toEqual([]);
});