// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

import {Tensor} from 'onnxruntime-common';

import {tensorTypeToTypedArrayConstructor} from '../wasm-common';

export const createView = (dataBuffer: ArrayBuffer, type: Tensor.Type): Int32Array|Uint32Array|BigInt64Array|
    BigUint64Array|Uint8Array|Float32Array|Float64Array|Int8Array|Int16Array|Uint16Array =>
        new (tensorTypeToTypedArrayConstructor(type))(dataBuffer);

/**
 * a TensorView does not own the data.
 */
export interface TensorView {
  readonly data: number;
  readonly dataType: number;
  readonly dims: readonly number[];

  /**
   * get a Float32Array data view of the tensor data. tensor data must be on CPU.
   */
  getFloat32Array(): Float32Array;

  /**
   * get a BigInt64Array data view of the tensor data. tensor data must be on CPU.
   */
  getBigInt64Array(): BigInt64Array;

  /**
   * get a Int32Array data view of the tensor data. tensor data must be on CPU.
   */
  getInt32Array(): Int32Array;

  /**
   * create a new tensor view with the same data but different dimensions.
   */
  reshape(newDims: readonly number[]): TensorView;
}