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

export function hashFile(file: string, algorithm = "sha512", encoding: "base64" | "hex" = "base64", options?: any) {
  return new Promise<string>((resolve, reject) => {
    const hash = createHash(algorithm)
    hash.on("error", reject).setEncoding(encoding)

    createReadStream(file, { ...options, highWaterMark: 1024 * 1024 /* better to use more memory but hash faster */ })
      .on("error", reject)
      .on("end", () => {
        hash.end()
        resolve(hash.read() as string)
      })
      .pipe(hash, { end: false })
  })
}