import SevenZip  from "./7z-wasm/7zz.es6.js";
let sevenZipInstance;

self.onmessage = async (e) => {
  const { filename, arrayBuffer } = e.data;

  try {
    if (!sevenZipInstance) {
      sevenZipInstance = await SevenZip();
    }

    // 写入 WASM FS
    const data = new Uint8Array(arrayBuffer);
    const stream = sevenZipInstance.FS.open(filename, "w+");
    sevenZipInstance.FS.write(stream, data, 0, data.length);
    sevenZipInstance.FS.close(stream);

    // 调用 7z 解压命令
    // 解压到当前 FS 根目录
    sevenZipInstance.callMain(["x", filename]);

    // 获取解压后的文件列表
    const files = sevenZipInstance.FS.readdir("/").filter(f => f.indexOf('.bin')!=-1);
    const buffers = files.map(f => ({
      name: f,
      data: sevenZipInstance.FS.readFile(f)
    }));

    // 清理 FS，防止堆积
    sevenZipInstance.FS.unlink(filename);
    for (const f of files) sevenZipInstance.FS.unlink(f);

    self.postMessage({ type: "done", result: buffers });
  } catch (err) {
    console.error(`[Worker] 解压失败 ${filename}:`, err);
    self.postMessage({ type: "done", result: null });
  }
};