import type { QuickJSContext, QuickJSHandle } from "quickjs-emscripten";

import { isArrayBuffer } from "../vmutil";

export default function unmarshalPrimitive(
  ctx: QuickJSContext,
  handle: QuickJSHandle,
): [any, boolean] {
  if (isArrayBuffer(ctx, handle)) {
    const value = ctx.getArrayBuffer(handle);
    const buffer = value.value;
    return [buffer.buffer, true];
  }
  const ty = ctx.typeof(handle);
  if (
    ty === "undefined" ||
    ty === "number" ||
    ty === "string" ||
    ty === "boolean" ||
    ty === "bigint"
  ) {
    return [ctx.dump(handle), true];
  } else if (ty === "object") {
    const isNull = ctx
      .unwrapResult(ctx.evalCode("a => a === null"))
      .consume(n => ctx.dump(ctx.unwrapResult(ctx.callFunction(n, ctx.undefined, handle))));
    if (isNull) {
      return [null, true];
    }
  }

  return [undefined, false];
}