/**
 * 单文件上限的环境变量解析 + commit message 默认文案。
 *
 * 上限:`HUB_FILELIB_MAX_FILE_BYTES` 覆盖,缺省 10MiB;非法值按缺省 ——
 * 配置写错不该让上传静默变成 0 上限(那会把每次上传都拒掉)。
 * 文案:`【用户名】修改了【路径】`,用户名取 displayName、缺失回退 userId。
 */
import { describe, expect, it } from "vitest";
import {
  FILE_CONTENT_MAX_BYTES_DEFAULT,
  defaultCommitMessage,
  parseMaxFileBytes,
} from "../../src/database/filelib/fileService.js";

describe("parseMaxFileBytes", () => {
  it("缺省 10MiB", () => {
    expect(FILE_CONTENT_MAX_BYTES_DEFAULT).toBe(10 * 1024 * 1024);
    expect(parseMaxFileBytes(undefined)).toBe(FILE_CONTENT_MAX_BYTES_DEFAULT);
    expect(parseMaxFileBytes("")).toBe(FILE_CONTENT_MAX_BYTES_DEFAULT);
    expect(parseMaxFileBytes("   ")).toBe(FILE_CONTENT_MAX_BYTES_DEFAULT);
  });

  it("合法正整数生效(可上调也可下调)", () => {
    expect(parseMaxFileBytes("1048576")).toBe(1024 * 1024);
    expect(parseMaxFileBytes(" 52428800 ")).toBe(50 * 1024 * 1024);
    expect(parseMaxFileBytes("1")).toBe(1);
  });

  it("非法值一律回退缺省,不产生 0 或负数上限", () => {
    for (const bad of ["0", "-1", "abc", "1.5", "NaN", "Infinity", "1e999", "10MB"]) {
      expect(parseMaxFileBytes(bad)).toBe(FILE_CONTENT_MAX_BYTES_DEFAULT);
    }
  });
});

describe("defaultCommitMessage", () => {
  it("【用户名】修改了【路径】,用户名取 displayName", () => {
    expect(defaultCommitMessage({ userId: "u1", isWebsiteAdmin: false, displayName: "张老师" }, "讲义/第一课.md"))
      .toBe("【张老师】修改了【讲义/第一课.md】");
  });

  it("displayName 缺失/空白时回退 userId", () => {
    expect(defaultCommitMessage({ userId: "u_alice", isWebsiteAdmin: false }, "a.md"))
      .toBe("【u_alice】修改了【a.md】");
    expect(defaultCommitMessage({ userId: "u_alice", isWebsiteAdmin: false, displayName: "   " }, "a.md"))
      .toBe("【u_alice】修改了【a.md】");
  });
});

/**
 * message 优先级的纯函数复刻(commitFile 里的那三行):
 * 非空则用调用方的,否则回退默认文案。空串必须算“没传” ——
 * `git commit -m ""` 会以 empty commit message 失败。
 */
function resolveMessage(input: string | undefined, fallback: string): string {
  const trimmed = input?.trim();
  return trimmed === undefined || trimmed === "" ? fallback : trimmed;
}

describe("commit message 优先级", () => {
  const fallback = "【张老师】修改了【a.md】";

  it("手填了就用手填的", () => {
    expect(resolveMessage("补上第三课的课件", fallback)).toBe("补上第三课的课件");
    expect(resolveMessage("  前后有空格  ", fallback)).toBe("前后有空格");
  });

  it("未传/空/约空白一律回退默认文案", () => {
    for (const raw of [undefined, "", "   ", "\n\t"]) {
      expect(resolveMessage(raw, fallback)).toBe(fallback);
    }
  });
});