type TProcessFunction = (input: string) => Promise<string>;

interface ISmartAiOptions {
  processFunction: TProcessFunction;
}

class SmartAi {
  private processFunction: TProcessFunction;
  private inputStreamWriter: WritableStreamDefaultWriter<string> | null = null;
  private outputStreamController: ReadableStreamDefaultController<string> | null = null;

  constructor(options: ISmartAiOptions) {
    this.processFunction = options.processFunction;
  }

  private setupOutputStream(): ReadableStream<string> {
    return new ReadableStream<string>({
      start: (controller) => {
        this.outputStreamController = controller;
      }
    });
  }

  private setupInputStream(): WritableStream<string> {
    return new WritableStream<string>({
      write: async (chunk) => {
        const processedData = await this.processFunction(chunk);
        if (this.outputStreamController) {
          this.outputStreamController.enqueue(processedData);
        }
      },
      close: () => {
        this.outputStreamController?.close();
      },
      abort: (err) => {
        console.error('Stream aborted', err);
        this.outputStreamController?.error(err);
      }
    });
  }

  public getInputStreamWriter(): WritableStreamDefaultWriter<string> {
    if (!this.inputStreamWriter) {
      const inputStream = this.setupInputStream();
      this.inputStreamWriter = inputStream.getWriter();
    }
    return this.inputStreamWriter;
  }

  public getOutputStream(): ReadableStream<string> {
    return this.setupOutputStream();
  }
}