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

import type { SessionHandler, InferenceSession, Tensor } from 'onnxruntime-common';

export interface SupportedBackend {
  name: string;
}

export interface ValueMetadata {
  name: string;
  isTensor: boolean;
  type: number;
  shape: number[];
  symbolicDimensions: string[];
}

type FeedsType = SessionHandler.FeedsType;
type FetchesType = SessionHandler.FetchesType;
type ReturnType = SessionHandler.ReturnType;
export type SessionOptions = InferenceSession.SessionOptions & {
  ortExtLibPath?: string;
};
export type RunOptions = InferenceSession.RunOptions;

export interface InferenceSessionImpl {
  loadModel(modelPath: string, options: SessionOptions): Promise<void>;
  loadModel(buffer: ArrayBuffer, byteOffset: number, byteLength: number, options: SessionOptions): Promise<void>;

  readonly inputMetadata: ValueMetadata[];
  readonly outputMetadata: ValueMetadata[];

  run(feeds: FeedsType, fetches: FetchesType, options: RunOptions): Promise<ReturnType>;

  endProfiling(): void;

  dispose(): void;
}

export declare interface OrtApi {
  createInferenceSession(): InferenceSessionImpl;

  listSupportedBackends(): SupportedBackend[];

  initOrtOnce(logLevel: number, tensorConstructor: typeof Tensor): void;

  version: string;
}