import { createHash } from "crypto";
import fs from "fs";

class FileUtils {
  public static formatBytes(bytes: number, decimals: number = 2): string {
    if (bytes === 0) return "0 Bytes";
    const k = 1024; // 1 KB = 1024 Bytes
    const dm = decimals < 0 ? 0 : decimals; // Ensure decimal places are not less than 0
    const sizes = ["Bytes", "KB", "MB", "GB", "TB"];

    const i = Math.floor(Math.log(bytes) / Math.log(k)); // Calculate unit index
    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + " " + sizes[i]; // Return formatted string
  }

  public static calculateFileChecksum(filePath: string) {
    const fileBuffer = fs.readFileSync(filePath);
    const hash = createHash("sha256");
    hash.update(fileBuffer);
    return hash.digest("hex");
  }

  public static mkdir(path: string) {
    if (!fs.existsSync(path)) {
      fs.mkdirSync(path, { recursive: true, mode: 0o777 });
    }
  }
}

export default FileUtils;