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

// WebNN API currently does not have a TypeScript definition file. This file is a workaround with types generated from
// WebNN API specification.
// https://github.com/webmachinelearning/webnn/issues/677
/// <reference path="jsep/webnn/webnn.d.ts" />

import type {Tensor} from 'onnxruntime-common';

/* eslint-disable @typescript-eslint/naming-convention */

export declare namespace JSEP {
  type BackendType = unknown;
  type AllocFunction = (size: number) => number;
  type FreeFunction = (size: number) => number;
  type UploadFunction = (dataOffset: number, gpuDataId: number, size: number) => void;
  type DownloadFunction = (gpuDataId: number, dataOffset: number, size: number) => Promise<void>;
  type CreateKernelFunction = (name: string, kernel: number, attribute: unknown) => void;
  type ReleaseKernelFunction = (kernel: number) => void;
  type RunFunction =
      (kernel: number, contextDataOffset: number, sessionHandle: number, errors: Array<Promise<string|null>>) => number;
  type CaptureBeginFunction = () => void;
  type CaptureEndFunction = () => void;
  type ReplayFunction = () => void;

  export interface Module extends WebGpuModule, WebNnModule {
    /**
     * Mount the external data file to an internal map, which will be used during session initialization.
     *
     * @param externalDataFilePath - specify the relative path of the external data file.
     * @param externalDataFileData - specify the content data.
     */
    mountExternalData(externalDataFilePath: string, externalDataFileData: Uint8Array): void;
    /**
     * Unmount all external data files from the internal map.
     */
    unmountExternalData(): void;

    /**
     * This is the entry of JSEP initialization. This function is called once when initializing ONNX Runtime per
     * backend. This function initializes Asyncify support. If name is 'webgpu', also initializes WebGPU backend and
     * registers a few callbacks that will be called in C++ code.
     */
    jsepInit(name: 'webgpu', initParams: [
      backend: BackendType, alloc: AllocFunction, free: FreeFunction, upload: UploadFunction,
      download: DownloadFunction, createKernel: CreateKernelFunction, releaseKernel: ReleaseKernelFunction,
      run: RunFunction, captureBegin: CaptureBeginFunction, captureEnd: CaptureEndFunction, replay: ReplayFunction
    ]): void;
    jsepInit(name: 'webnn', initParams?: never): void;
  }

  export interface WebGpuModule {
    /**
     * [exported from wasm] Specify a kernel's output when running OpKernel::Compute().
     *
     * @param context - specify the kernel context pointer.
     * @param index - specify the index of the output.
     * @param data - specify the pointer to encoded data of type and dims.
     */
    _JsepOutput(context: number, index: number, data: number): number;
    /**
     * [exported from wasm] Get name of an operator node.
     *
     * @param kernel - specify the kernel pointer.
     * @returns the pointer to a C-style UTF8 encoded string representing the node name.
     */
    _JsepGetNodeName(kernel: number): number;

    /**
     * [exported from pre-jsep.js] Register a user GPU buffer for usage of a session's input or output.
     *
     * @param sessionId - specify the session ID.
     * @param index - specify an integer to represent which input/output it is registering for. For input, it is the
     *     input_index corresponding to the session's inputNames. For output, it is the inputCount + output_index
     *     corresponding to the session's ouputNames.
     * @param buffer - specify the GPU buffer to register.
     * @param size - specify the original data size in byte.
     * @returns the GPU data ID for the registered GPU buffer.
     */
    jsepRegisterBuffer: (sessionId: number, index: number, buffer: GPUBuffer, size: number) => number;
    /**
     * [exported from pre-jsep.js] Get the GPU buffer by GPU data ID.
     *
     * @param dataId - specify the GPU data ID
     * @returns the GPU buffer.
     */
    jsepGetBuffer: (dataId: number) => GPUBuffer;
    /**
     * [exported from pre-jsep.js] Create a function to be used to create a GPU Tensor.
     *
     * @param gpuBuffer - specify the GPU buffer
     * @param size - specify the original data size in byte.
     * @param type - specify the tensor type.
     * @returns the generated downloader function.
     */
    jsepCreateDownloader:
        (gpuBuffer: GPUBuffer, size: number,
         type: Tensor.GpuBufferDataTypes) => () => Promise<Tensor.DataTypeMap[Tensor.GpuBufferDataTypes]>;
    /**
     *  [exported from pre-jsep.js] Called when InferenceSession.run started. This function will be called before
     * _OrtRun[WithBinding]() is called.
     * @param sessionId - specify the session ID.
     */
    jsepOnRunStart: (sessionId: number) => void;
    /**
     * [exported from pre-jsep.js] Release a session. This function will be called before _OrtReleaseSession() is
     * called.
     * @param sessionId - specify the session ID.
     * @returns
     */
    jsepOnReleaseSession: (sessionId: number) => void;
  }

  export interface WebNnModule {
    /**
     * Active MLContext used to create WebNN EP.
     */
    currentContext: MLContext;
  }
}

export interface OrtInferenceAPIs {
  _OrtInit(numThreads: number, loggingLevel: number): number;

  _OrtGetLastError(errorCodeOffset: number, errorMessageOffset: number): void;

  _OrtCreateSession(dataOffset: number, dataLength: number, sessionOptionsHandle: number): Promise<number>;
  _OrtReleaseSession(sessionHandle: number): void;
  _OrtGetInputOutputCount(sessionHandle: number, inputCountOffset: number, outputCountOffset: number): number;
  _OrtGetInputName(sessionHandle: number, index: number): number;
  _OrtGetOutputName(sessionHandle: number, index: number): number;

  _OrtFree(stringHandle: number): void;

  _OrtCreateTensor(
      dataType: number, dataOffset: number, dataLength: number, dimsOffset: number, dimsLength: number,
      dataLocation: number): number;
  _OrtGetTensorData(tensorHandle: number, dataType: number, dataOffset: number, dimsOffset: number, dimsLength: number):
      number;
  _OrtReleaseTensor(tensorHandle: number): void;
  _OrtCreateBinding(sessionHandle: number): number;
  _OrtBindInput(bindingHandle: number, nameOffset: number, tensorHandle: number): Promise<number>;
  _OrtBindOutput(bindingHandle: number, nameOffset: number, tensorHandle: number, location: number): number;
  _OrtClearBoundOutputs(ioBindingHandle: number): void;
  _OrtReleaseBinding(ioBindingHandle: number): void;
  _OrtRunWithBinding(
      sessionHandle: number, ioBindingHandle: number, outputCount: number, outputsOffset: number,
      runOptionsHandle: number): Promise<number>;
  _OrtRun(
      sessionHandle: number, inputNamesOffset: number, inputsOffset: number, inputCount: number,
      outputNamesOffset: number, outputCount: number, outputsOffset: number, runOptionsHandle: number): Promise<number>;

  _OrtCreateSessionOptions(
      graphOptimizationLevel: number, enableCpuMemArena: boolean, enableMemPattern: boolean, executionMode: number,
      enableProfiling: boolean, profileFilePrefix: number, logId: number, logSeverityLevel: number,
      logVerbosityLevel: number, optimizedModelFilePath: number): number;
  _OrtAppendExecutionProvider(sessionOptionsHandle: number, name: number): number;
  _OrtAddFreeDimensionOverride(sessionOptionsHandle: number, name: number, dim: number): number;
  _OrtAddSessionConfigEntry(sessionOptionsHandle: number, configKey: number, configValue: number): number;
  _OrtReleaseSessionOptions(sessionOptionsHandle: number): void;

  _OrtCreateRunOptions(logSeverityLevel: number, logVerbosityLevel: number, terminate: boolean, tag: number): number;
  _OrtAddRunConfigEntry(runOptionsHandle: number, configKey: number, configValue: number): number;
  _OrtReleaseRunOptions(runOptionsHandle: number): void;

  _OrtEndProfiling(sessionHandle: number): number;
}

export interface OrtTrainingAPIs {
  _OrtTrainingLoadCheckpoint(dataOffset: number, dataLength: number): number;

  _OrtTrainingReleaseCheckpoint(checkpointHandle: number): void;

  _OrtTrainingCreateSession(
      sessionOptionsHandle: number, checkpointHandle: number, trainOffset: number, trainLength: number,
      evalOffset: number, evalLength: number, optimizerOffset: number, optimizerLength: number): number;

  _OrtTrainingLazyResetGrad(trainingHandle: number): number;

  _OrtTrainingRunTrainStep(
      trainingHandle: number, inputsOffset: number, inputCount: number, outputsOffset: number, outputCount: number,
      runOptionsHandle: number): number;

  _OrtTrainingOptimizerStep(trainingHandle: number, runOptionsHandle: number): number;

  _OrtTrainingEvalStep(
      trainingHandle: number, inputsOffset: number, inputCount: number, outputsOffset: number, outputCount: number,
      runOptionsHandle: number): number;

  _OrtTrainingGetParametersSize(trainingHandle: number, paramSizeT: number, trainableOnly: boolean): number;

  _OrtTrainingCopyParametersToBuffer(
      trainingHandle: number, parametersBuffer: number, parameterCount: number, trainableOnly: boolean): number;

  _OrtTrainingCopyParametersFromBuffer(
      trainingHandle: number, parametersBuffer: number, parameterCount: number, trainableOnly: boolean): number;

  _OrtTrainingGetModelInputOutputCount(
      trainingHandle: number, inputCount: number, outputCount: number, isEvalModel: boolean): number;
  _OrtTrainingGetModelInputOutputName(trainingHandle: number, index: number, isInput: boolean, isEvalModel: boolean):
      number;

  _OrtTrainingReleaseSession(trainingHandle: number): void;
}

/**
 * The interface of the WebAssembly module for ONNX Runtime, compiled from C++ source code by Emscripten.
 */
export interface OrtWasmModule extends EmscriptenModule, OrtInferenceAPIs, Partial<OrtTrainingAPIs>,
                                       Partial<JSEP.Module> {
  // #region emscripten functions
  stackSave(): number;
  stackRestore(stack: number): void;
  stackAlloc(size: number): number;

  UTF8ToString(offset: number, maxBytesToRead?: number): string;
  lengthBytesUTF8(str: string): number;
  stringToUTF8(str: string, offset: number, maxBytes: number): void;
  // #endregion

  // #region config
  numThreads?: number;
  // #endregion
}