import fs from "fs";
import { BaseEthStorage } from "./ethstorage";

export class EthStorage extends BaseEthStorage {
  getFileInfo(filePath: string) {
    console.log("getFileInfo", filePath);
    const fileStat = fs.statSync(filePath);
    if (fileStat.isFile()) {
      const name = filePath.substring(filePath.lastIndexOf("/") + 1);
      return {
        isFile: true,
        isDirectory: false,
        name: name,
        size: fileStat.size,
        path: filePath,
      };
    }
    return {
      isFile: false,
      isDirectory: fileStat.isDirectory(),
    };
  }

  async getFileChunk(
    filePath: string,
    fileSize: number,
    start: number,
    end: number
  ): Promise<Buffer> {
    end = end > fileSize ? fileSize : end;
    const length = end - start;
    const buf = Buffer.alloc(length);
    const fd = fs.openSync(filePath, "r");
    fs.readSync(fd, buf, 0, length, start);
    fs.closeSync(fd);
    return buf;
  }
}