import { describe, it, expect } from "vitest";
import { cn, getDifficultyColor, getDifficultyLabel, capitalize } from "./utils";

describe("cn", () => {
  it("joins multiple class names", () => {
    expect(cn("foo", "bar")).toBe("foo bar");
  });

  it("filters out falsy values", () => {
    expect(cn("foo", undefined, false, "bar")).toBe("foo bar");
  });

  it("returns empty string for no classes", () => {
    expect(cn()).toBe("");
  });
});

describe("getDifficultyColor", () => {
  it("returns easy difficulty CSS variable classes", () => {
    const result = getDifficultyColor("easy");
    expect(result).toContain("--difficulty-easy");
  });

  it("returns medium difficulty CSS variable classes", () => {
    const result = getDifficultyColor("medium");
    expect(result).toContain("--difficulty-medium");
  });

  it("returns hard difficulty CSS variable classes", () => {
    const result = getDifficultyColor("hard");
    expect(result).toContain("--difficulty-hard");
  });
});

describe("getDifficultyLabel", () => {
  it("returns accessible label for easy", () => {
    expect(getDifficultyLabel("easy")).toBe("Easy difficulty");
  });

  it("returns accessible label for medium", () => {
    expect(getDifficultyLabel("medium")).toBe("Medium difficulty");
  });

  it("returns accessible label for hard", () => {
    expect(getDifficultyLabel("hard")).toBe("Hard difficulty");
  });
});

describe("capitalize", () => {
  it("capitalizes first letter", () => {
    expect(capitalize("hello")).toBe("Hello");
  });

  it("handles already capitalized strings", () => {
    expect(capitalize("Hello")).toBe("Hello");
  });

  it("handles single character", () => {
    expect(capitalize("a")).toBe("A");
  });

  it("handles empty string", () => {
    expect(capitalize("")).toBe("");
  });
});