import { StreamEncoderHelper } from '../stream-helper/encoder.js';
import type { EncodeOptions } from '../options.js';

/** 流式编码 UBJSON */
export class EncodeTransformer implements Transformer<unknown, Uint8Array<ArrayBuffer>> {
    constructor(options?: EncodeOptions) {
        this.helper = new StreamEncoderHelper(options, (binary) => {
            this.controller.enqueue(binary);
        });
    }
    private readonly helper;
    private controller!: TransformStreamDefaultController<Uint8Array<ArrayBuffer>>;

    /** @inheritdoc */
    transform(obj: unknown, controller: TransformStreamDefaultController<Uint8Array<ArrayBuffer>>): void {
        this.controller = controller;
        this.helper.encode(obj);
    }

    /** @inheritdoc */
    flush(controller: TransformStreamDefaultController<Uint8Array<ArrayBuffer>>): void {
        this.controller = controller;
        this.helper.destroy();
        controller.terminate();
    }
}