// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from '../../core/common/common.js';
import type * as PlatformApi from '../../core/platform/api/api.js';
import * as Platform from '../../core/platform/platform.js';

import type {ChildrenProvider} from './ChildrenProvider.js';
import type * as HeapSnapshotModel from './HeapSnapshotModel.js';

export class HeapSnapshotWorkerProxy extends Common.ObjectWrapper.ObjectWrapper<HeapSnapshotWorkerProxy.EventTypes> {
  readonly eventHandler: (arg0: string, arg1: string) => void;
  nextObjectId = 1;
  nextCallId = 1;
  callbacks = new Map<number, (...args: any[]) => void>();
  readonly previousCallbacks = new Set<number>();
  readonly worker: PlatformApi.HostRuntime.Worker;
  interval?: number;
  readonly workerUrl?: string;

  constructor(eventHandler: (arg0: string, arg1: string) => void, workerUrl?: string) {
    super();
    this.eventHandler = eventHandler;
    this.workerUrl = workerUrl;
    this.worker = Platform.HostRuntime.HOST_RUNTIME.createWorker(
        workerUrl ?? import.meta.resolve('../../entrypoints/heap_snapshot_worker/heap_snapshot_worker-entrypoint.js'),
    );
    this.worker.onmessage = this.messageReceived.bind(this);
  }

  createLoader(profileUid: number, snapshotReceivedCallback: (arg0: HeapSnapshotProxy) => void):
      HeapSnapshotLoaderProxy {
    const objectId = this.nextObjectId++;
    const proxy = new HeapSnapshotLoaderProxy(this, objectId, profileUid, snapshotReceivedCallback);
    this.postMessage({
      callId: this.nextCallId++,
      disposition: 'createLoader',
      objectId,
    });
    return proxy;
  }

  dispose(): void {
    this.worker.terminate();
    clearInterval(this.interval);
  }

  disposeObject(objectId: number): void {
    this.postMessage({callId: this.nextCallId++, disposition: 'dispose', objectId});
  }

  evaluateForTest(script: string, callback: (...arg0: any[]) => void): void {
    const callId = this.nextCallId++;
    this.callbacks.set(callId, callback);
    this.postMessage({callId, disposition: 'evaluateForTest', source: script});
  }

  callFactoryMethod<T extends Object>(
      callback: null, objectId: string, methodName: string, proxyConstructor: new(...arg1: any[]) => T,
      transfer: PlatformApi.HostRuntime.WorkerTransferable[], ...methodArguments: any[]): T;
  callFactoryMethod<T extends Object>(
      callback: ((...arg0: any[]) => void), objectId: string, methodName: string,
      proxyConstructor: new(...arg1: any[]) => T, transfer: PlatformApi.HostRuntime.WorkerTransferable[],
      ...methodArguments: any[]): null;
  callFactoryMethod<T extends Object>(
      callback: ((...arg0: any[]) => void)|null, objectId: string, methodName: string,
      proxyConstructor: new(...arg1: any[]) => T, transfer: PlatformApi.HostRuntime.WorkerTransferable[],
      ...methodArguments: any[]): T|null {
    const callId = this.nextCallId++;
    const newObjectId = this.nextObjectId++;

    if (callback) {
      this.callbacks.set(callId, remoteResult => {
        callback(remoteResult ? new proxyConstructor(this, newObjectId) : null);
      });
      this.postMessage(
          {
            callId,
            disposition: 'factory',
            objectId,
            methodName,
            methodArguments,
            newObjectId,
          },
          transfer);
      return null;
    }
    this.postMessage(
        {
          callId,
          disposition: 'factory',
          objectId,
          methodName,
          methodArguments,
          newObjectId,
        },
        transfer);
    return new proxyConstructor(this, newObjectId);
  }

  callMethod(callback: (...arg0: any[]) => void, objectId: string, methodName: string, ...methodArguments: any[]):
      void {
    const callId = this.nextCallId++;
    if (callback) {
      this.callbacks.set(callId, callback);
    }
    this.postMessage({
      callId,
      disposition: 'method',
      objectId,
      methodName,
      methodArguments,
    });
  }

  startCheckingForLongRunningCalls(): void {
    if (this.interval) {
      return;
    }
    this.checkLongRunningCalls();
    this.interval = window.setInterval(this.checkLongRunningCalls.bind(this), 300);
  }

  checkLongRunningCalls(): void {
    for (const callId of this.previousCallbacks) {
      if (!this.callbacks.has(callId)) {
        this.previousCallbacks.delete(callId);
      }
    }
    const hasLongRunningCalls = Boolean(this.previousCallbacks.size);
    this.dispatchEventToListeners(HeapSnapshotWorkerProxy.Events.WAIT, hasLongRunningCalls);
    for (const callId of this.callbacks.keys()) {
      this.previousCallbacks.add(callId);
    }
  }

  setupForSecondaryInit(port: MessagePort): Promise<void> {
    const callId = this.nextCallId++;
    const done = new Promise<void>(resolve => {
      this.callbacks.set(callId, resolve);
    });
    this.postMessage(
        {
          callId,
          disposition: 'setupForSecondaryInit',
          objectId: this.nextObjectId++,
        },
        [port]);
    return done;
  }

  messageReceived(event: PlatformApi.HostRuntime.WorkerMessageEvent): void {
    const data = event.data;
    if (data.eventName) {
      if (this.eventHandler) {
        this.eventHandler(data.eventName, data.data);
      }
      return;
    }
    if (data.error) {
      Common.Console.Console.instance().error(
          `An error occurred when a call to method '${data.errorMethodName}' was requested`);
      Common.Console.Console.instance().error(data['errorCallStack']);
      this.callbacks.delete(data.callId);
      return;
    }
    const callback = this.callbacks.get(data.callId);
    if (!callback) {
      return;
    }
    this.callbacks.delete(data.callId);
    callback(data.result);
  }

  postMessage(message: unknown, transfer?: PlatformApi.HostRuntime.WorkerTransferable[]): void {
    this.worker.postMessage(message, transfer);
  }
}

export namespace HeapSnapshotWorkerProxy {
  export const enum Events {
    WAIT = 'Wait',
  }

  export interface EventTypes {
    [Events.WAIT]: boolean;
  }
}

export class HeapSnapshotProxyObject {
  readonly worker: HeapSnapshotWorkerProxy;
  readonly objectId: number;
  constructor(worker: HeapSnapshotWorkerProxy, objectId: number) {
    this.worker = worker;
    this.objectId = objectId;
  }

  dispose(): void {
    this.worker.disposeObject(this.objectId);
  }

  callFactoryMethod<T extends Object>(methodName: string, proxyConstructor: new(...arg1: any[]) => T, ...args: any[]):
      T {
    return this.worker.callFactoryMethod(null, String(this.objectId), methodName, proxyConstructor, [], ...args);
  }

  callFactoryMethodPromise<T extends Object>(
      methodName: string, proxyConstructor: new(...arg1: any[]) => T,
      transfer: PlatformApi.HostRuntime.WorkerTransferable[], ...args: any[]): Promise<T> {
    return new Promise(
        resolve => this.worker.callFactoryMethod(
            resolve, String(this.objectId), methodName, proxyConstructor, transfer, ...args));
  }

  callMethodPromise<T>(methodName: string, ...args: any[]): Promise<T> {
    return new Promise(resolve => this.worker.callMethod(resolve, String(this.objectId), methodName, ...args));
  }
}

export class HeapSnapshotLoaderProxy extends HeapSnapshotProxyObject implements Common.StringOutputStream.OutputStream {
  readonly profileUid: number;
  readonly snapshotReceivedCallback: (arg0: HeapSnapshotProxy) => void;
  constructor(
      worker: HeapSnapshotWorkerProxy,
      objectId: number,
      profileUid: number,
      snapshotReceivedCallback: (arg0: HeapSnapshotProxy) => void,
  ) {
    super(worker, objectId);
    this.profileUid = profileUid;
    this.snapshotReceivedCallback = snapshotReceivedCallback;
  }

  async write(chunk: string): Promise<void> {
    await this.callMethodPromise('write', chunk);
  }

  async close(): Promise<void> {
    await this.callMethodPromise('close');
    const secondWorker = new HeapSnapshotWorkerProxy(() => {}, this.worker.workerUrl);
    const channel = new MessageChannel();
    await secondWorker.setupForSecondaryInit(channel.port2);
    const snapshotProxy = await this.callFactoryMethodPromise('buildSnapshot', HeapSnapshotProxy, [channel.port1]);
    secondWorker.dispose();
    this.dispose();
    // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration)
    // @ts-expect-error
    snapshotProxy.setProfileUid(this.profileUid);
    await snapshotProxy.updateStaticData();
    this.snapshotReceivedCallback(snapshotProxy);
  }
}

export class HeapSnapshotProxy extends HeapSnapshotProxyObject {
  staticData: HeapSnapshotModel.StaticData|null;
  profileUid?: string;

  constructor(worker: HeapSnapshotWorkerProxy, objectId: number) {
    super(worker, objectId);
    this.staticData = null;
  }

  search(searchConfig: HeapSnapshotModel.SearchConfig, filter: HeapSnapshotModel.NodeFilter): Promise<number[]> {
    return this.callMethodPromise('search', searchConfig, filter);
  }

  interfaceDefinitions(): Promise<string> {
    return this.callMethodPromise('interfaceDefinitions');
  }

  aggregatesWithFilter(filter: HeapSnapshotModel.NodeFilter):
      Promise<Record<string, HeapSnapshotModel.AggregatedInfo>> {
    return this.callMethodPromise('aggregatesWithFilter', filter);
  }

  aggregatesForDiff(interfaceDefinitions: string): Promise<Record<string, HeapSnapshotModel.AggregateForDiff>> {
    return this.callMethodPromise('aggregatesForDiff', interfaceDefinitions);
  }

  calculateSnapshotDiff(
      baseSnapshotId: string,
      baseSnapshotAggregates: Record<string, HeapSnapshotModel.AggregateForDiff>,
      ): Promise<Record<string, HeapSnapshotModel.Diff>> {
    return this.callMethodPromise('calculateSnapshotDiff', baseSnapshotId, baseSnapshotAggregates);
  }

  nodeClassKey(snapshotObjectId: number): Promise<string|null> {
    return this.callMethodPromise('nodeClassKey', snapshotObjectId);
  }

  createEdgesProvider(nodeIndex: number): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createEdgesProvider', HeapSnapshotProviderProxy, nodeIndex);
  }

  createRetainingEdgesProvider(nodeIndex: number): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createRetainingEdgesProvider', HeapSnapshotProviderProxy, nodeIndex);
  }

  createAddedNodesProvider(baseSnapshotId: string, classKey: string): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createAddedNodesProvider', HeapSnapshotProviderProxy, baseSnapshotId, classKey);
  }

  createDeletedNodesProvider(nodeIndexes: number[]): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createDeletedNodesProvider', HeapSnapshotProviderProxy, nodeIndexes);
  }

  createNodesProvider(filter: (...args: any[]) => boolean): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createNodesProvider', HeapSnapshotProviderProxy, filter);
  }

  createNodesProviderForClass(classKey: string, nodeFilter: HeapSnapshotModel.NodeFilter): HeapSnapshotProviderProxy {
    return this.callFactoryMethod('createNodesProviderForClass', HeapSnapshotProviderProxy, classKey, nodeFilter);
  }

  allocationTracesTops(): Promise<HeapSnapshotModel.SerializedAllocationNode[]> {
    return this.callMethodPromise('allocationTracesTops');
  }

  allocationNodeCallers(nodeId: number): Promise<HeapSnapshotModel.AllocationNodeCallers> {
    return this.callMethodPromise('allocationNodeCallers', nodeId);
  }

  allocationStack(nodeIndex: number): Promise<HeapSnapshotModel.AllocationStackFrame[]|null> {
    return this.callMethodPromise('allocationStack', nodeIndex);
  }

  override dispose(): void {
    throw new Error('Should never be called');
  }

  get nodeCount(): number {
    if (!this.staticData) {
      return 0;
    }
    return this.staticData.nodeCount;
  }

  get rootNodeIndex(): number {
    if (!this.staticData) {
      return 0;
    }
    return this.staticData.rootNodeIndex;
  }

  async updateStaticData(): Promise<void> {
    this.staticData = await this.callMethodPromise('updateStaticData');
  }

  getStatistics(): Promise<HeapSnapshotModel.Statistics> {
    return this.callMethodPromise('getStatistics');
  }

  getLocation(nodeIndex: number): Promise<HeapSnapshotModel.Location|null> {
    return this.callMethodPromise('getLocation', nodeIndex);
  }

  getSamples(): Promise<HeapSnapshotModel.Samples|null> {
    return this.callMethodPromise('getSamples');
  }

  ignoreNodeInRetainersView(nodeIndex: number): Promise<void> {
    return this.callMethodPromise('ignoreNodeInRetainersView', nodeIndex);
  }

  unignoreNodeInRetainersView(nodeIndex: number): Promise<void> {
    return this.callMethodPromise('unignoreNodeInRetainersView', nodeIndex);
  }

  unignoreAllNodesInRetainersView(): Promise<void> {
    return this.callMethodPromise('unignoreAllNodesInRetainersView');
  }

  areNodesIgnoredInRetainersView(): Promise<boolean> {
    return this.callMethodPromise('areNodesIgnoredInRetainersView');
  }

  get totalSize(): number {
    if (!this.staticData) {
      return 0;
    }
    return this.staticData.totalSize;
  }

  get uid(): string|undefined {
    return this.profileUid;
  }

  setProfileUid(profileUid: string): void {
    this.profileUid = profileUid;
  }

  maxJSObjectId(): number {
    if (!this.staticData) {
      return 0;
    }
    return this.staticData.maxJSObjectId;
  }
}

export class HeapSnapshotProviderProxy extends HeapSnapshotProxyObject implements ChildrenProvider {
  nodePosition(snapshotObjectId: number): Promise<number> {
    return this.callMethodPromise('nodePosition', snapshotObjectId);
  }

  isEmpty(): Promise<boolean> {
    return this.callMethodPromise('isEmpty');
  }

  serializeItemsRange(startPosition: number, endPosition: number): Promise<HeapSnapshotModel.ItemsRange> {
    return this.callMethodPromise('serializeItemsRange', startPosition, endPosition);
  }

  async sortAndRewind(comparator: HeapSnapshotModel.ComparatorConfig): Promise<void> {
    await this.callMethodPromise('sortAndRewind', comparator);
  }
}