import { Readable } from "node:stream";

export type StreamResolvable = Buffer | Readable | ReadableStream<Uint8Array>;

export function intoReadable(input: StreamResolvable): Readable {
  if (Buffer.isBuffer(input)) {
    return Readable.from(input);
  }

  if (input instanceof Readable) {
    return input;
  }

  if ("getReader" in input && typeof input.getReader === "function") {
    const reader = input.getReader();

    return new Readable({
      async read() {
        try {
          const { done, value } = await reader.read();
          if (done) {
            this.push(null);
          } else {
            if (value) this.push(Buffer.from(value));
          }
        } catch (err) {
          this.destroy(err as Error);
        }
      },
    });
  }

  throw new TypeError("Unsupported stream type");
}