import { describe, expect, test } from "bun:test";
import {
  buildLevelProgress,
  totalXpForLevel,
  xpRequiredForLevel,
} from "@/lib/leaderboard/level-progress";

describe("leaderboard level formula", () => {
  test("matches the bot thresholds", () => {
    expect(xpRequiredForLevel(0)).toBe(BigInt(500));
    expect(xpRequiredForLevel(1)).toBe(BigInt(625));
    expect(totalXpForLevel(1)).toBe(BigInt(500));
    expect(totalXpForLevel(2)).toBe(BigInt(1_125));
  });

  test("calculates progress at level boundaries", () => {
    expect(buildLevelProgress(0, "499")).toMatchObject({
      xpIntoLevel: "499",
      xpRequired: "500",
      xpToNextLevel: "1",
      percentage: 99.8,
    });
    expect(buildLevelProgress(1, "500")).toMatchObject({
      xpIntoLevel: "0",
      xpRequired: "625",
      xpToNextLevel: "625",
      percentage: 0,
    });
  });

  test("clamps inconsistent and very large totals without losing precision", () => {
    expect(buildLevelProgress(12, "1").percentage).toBe(0);

    const huge = buildLevelProgress(12, "9999999999999999999999999999999999999999");
    expect(huge.percentage).toBe(100);
    expect(huge.totalXp).toBe("9999999999999999999999999999999999999999");
  });

  test("marks level 200 as max level and caps the formula", () => {
    const maxLevel = buildLevelProgress(200, totalXpForLevel(200).toString());

    expect(maxLevel.isMaxLevel).toBeTrue();
    expect(xpRequiredForLevel(200)).toBe(xpRequiredForLevel(199));
  });
});