import { describe, expect, it } from "vitest";
import { formatTokens, kToTokens, tokenInputError, tokenRangeText, tokensToK } from "./tokens.ts";

describe("token 以 K 为单位的换算", () => {
  it("原始值 → 输入框 K 值:整千、小数、空", () => {
    expect(tokensToK(128_000)).toBe("128");
    expect(tokensToK(1_500)).toBe("1.5");
    expect(tokensToK(4_096)).toBe("4.096");
    expect(tokensToK(2_000_000)).toBe("2000");
    expect(tokensToK(null)).toBe("");
    expect(tokensToK(undefined)).toBe("");
  });

  it("K 值 → 原始值:允许小数与尾随 K,空串 undefined,非法 NaN", () => {
    expect(kToTokens("128")).toBe(128_000);
    expect(kToTokens(" 1.5 ")).toBe(1_500);
    expect(kToTokens("200k")).toBe(200_000);
    expect(kToTokens(".5")).toBe(500);
    expect(kToTokens("0.0005")).toBe(1);
    expect(kToTokens("")).toBeUndefined();
    expect(kToTokens("  ")).toBeUndefined();
    expect(kToTokens("abc")).toBeNaN();
    expect(kToTokens("-1")).toBeNaN();
    expect(kToTokens("1e3")).toBeNaN();
  });

  it("往返不丢精度", () => {
    for (const n of [4_000, 4_096, 128_000, 131_072, 1_000_000, 2_000_000, 1]) expect(kToTokens(tokensToK(n))).toBe(n);
  });

  it("校验:范围、必填、非法输入,错误用 K 表述", () => {
    const r = { min: 4_000, max: 2_000_000, required: true };
    expect(tokenRangeText(r)).toBe("4K–2000K");
    expect(tokenInputError("128", r)).toBeNull();
    expect(tokenInputError("4", r)).toBeNull();
    expect(tokenInputError("3.9", r)).toBe("填 4K–2000K");
    expect(tokenInputError("2001", r)).toBe("填 4K–2000K");
    expect(tokenInputError("", r)).toBe("填一个数，单位 K");
    expect(tokenInputError("12x", r)).toMatch(/只填数字/);
    // 可选:空串通过;0 不行
    expect(tokenInputError("", { min: 1 })).toBeNull();
    expect(tokenInputError("0", { min: 1 })).toBe("填 0.001K 以上");
    expect(tokenInputError("0", {})).toBe("填大于 0 的数");
  });

  it("列表 / 详情显示:K / M 简写", () => {
    expect(formatTokens(512)).toBe("512");
    expect(formatTokens(1_500)).toBe("1.5K");
    expect(formatTokens(12_345)).toBe("12.3K");
    expect(formatTokens(128_000)).toBe("128K");
    expect(formatTokens(200_000)).toBe("200K");
    expect(formatTokens(999_960)).toBe("1M");
    expect(formatTokens(1_000_000)).toBe("1M");
    expect(formatTokens(1_048_576)).toBe("1.05M");
    expect(formatTokens(undefined)).toBe("—");
  });
});