import { registerSync } from './reconstruct.ts';
import type { Loadable } from './loadable.ts';

export class Uint64 implements Loadable<bigint> {
  static readonly byteSize = 8;
  static readonly byteAlignment = 8;
  private readonly view: BigUint64Array;

  constructor(buffer?: SharedArrayBuffer, byteOffset?: number) {
    const buf = buffer ?? new SharedArrayBuffer(8);
    const offset = byteOffset ?? 0;
    this.view = new BigUint64Array(buf, offset, 1);
  }

  load(): bigint {
    return this.view[0];
  }

  store(value: bigint): void {
    this.view[0] = value;
  }

  [Symbol.for('moroutine.shared')](): { tag: string; buffer: SharedArrayBuffer; byteOffset: number } {
    return { tag: 'Uint64', buffer: this.view.buffer as SharedArrayBuffer, byteOffset: this.view.byteOffset };
  }
}

registerSync('Uint64', Uint64);