import { describe, expect, test } from "bun:test";
import { BACKUP_HEADER, backupStats, packBackup, readBackupFile, unpackBackup } from "../src/index.ts";

const sampleBackupPath = "resources/备份2026_4_26 19_17_42.bak";

describe("备份文件处理", () => {
  test("真实备份可以解包并统计", () => {
    const backup = readBackupFile(sampleBackupPath);
    expect(backupStats(backup)).toEqual({
      version: 2,
      ruleCount: 15,
      globalVariableCount: 25,
      nodeCount: 267,
    });
  });

  test("打包结果使用固定头并可往返解包", () => {
    const backup = readBackupFile(sampleBackupPath);
    const packed = packBackup(backup);
    expect([...packed.subarray(0, 4)]).toEqual([...BACKUP_HEADER]);
    expect(unpackBackup(packed)).toEqual(backup);
  });

  test("非法文件头会报错", () => {
    expect(() => unpackBackup(new Uint8Array([0, 1, 2, 3, 4]))).toThrow("备份文件头不匹配");
  });
});