import { describe, it, expect } from "vitest";
import { xpForLevel, levelFromXp, xpProgressInLevel } from "./levels";

describe("xpForLevel", () => {
  it("returns 0 for level 1", () => {
    expect(xpForLevel(1)).toBe(0);
  });

  it("increases with level", () => {
    expect(xpForLevel(2)).toBeGreaterThan(0);
    expect(xpForLevel(10)).toBeGreaterThan(xpForLevel(5));
  });
});

describe("levelFromXp", () => {
  it("returns level 1 at zero XP", () => {
    expect(levelFromXp(0)).toBe(1);
  });

  it("levels up at threshold", () => {
    const level2Xp = xpForLevel(2);
    expect(levelFromXp(level2Xp)).toBe(2);
    expect(levelFromXp(level2Xp - 1)).toBe(1);
  });
});

describe("xpProgressInLevel", () => {
  it("computes progress within current level", () => {
    const totalXp = xpForLevel(3) + 10;
    const progress = xpProgressInLevel(totalXp);
    expect(progress.level).toBe(3);
    expect(progress.current).toBe(10);
    expect(progress.percent).toBeGreaterThan(0);
    expect(progress.percent).toBeLessThanOrEqual(100);
  });
});