// Copyright 2012 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 * as SDK from '../../core/sdk/sdk.js';
import type * as Protocol from '../../generated/protocol.js';
import type * as Workspace from '../workspace/workspace.js';

const uiSourceCodeToAttributionMap = new WeakMap<Workspace.UISourceCode.UISourceCode, Map<Protocol.Page.FrameId, {
                                                   frame: SDK.ResourceTreeModel.ResourceTreeFrame,
                                                   count: number,
                                                 }>>();
const projectToTargetMap = new WeakMap<Workspace.Workspace.Project, SDK.Target.Target>();

let networkProjectManagerInstance: NetworkProjectManager;

export class NetworkProjectManager extends Common.ObjectWrapper.ObjectWrapper<EventTypes> {
  private constructor() {
    super();
  }

  static instance({forceNew}: {
    forceNew: boolean,
  } = {forceNew: false}): NetworkProjectManager {
    if (!networkProjectManagerInstance || forceNew) {
      networkProjectManagerInstance = new NetworkProjectManager();
    }

    return networkProjectManagerInstance;
  }
}

export const enum Events {
  FRAME_ATTRIBUTION_ADDED = 'FrameAttributionAdded',
  FRAME_ATTRIBUTION_REMOVED = 'FrameAttributionRemoved',
}

export interface FrameAttributionEvent {
  uiSourceCode: Workspace.UISourceCode.UISourceCode;
  frame: SDK.ResourceTreeModel.ResourceTreeFrame;
}

export interface EventTypes {
  [Events.FRAME_ATTRIBUTION_ADDED]: FrameAttributionEvent;
  [Events.FRAME_ATTRIBUTION_REMOVED]: FrameAttributionEvent;
}

export class NetworkProject {
  static resolveFrame(uiSourceCode: Workspace.UISourceCode.UISourceCode, frameId: Protocol.Page.FrameId):
      SDK.ResourceTreeModel.ResourceTreeFrame|null {
    const target = NetworkProject.targetForUISourceCode(uiSourceCode);
    const resourceTreeModel = target?.model(SDK.ResourceTreeModel.ResourceTreeModel);
    return resourceTreeModel ? resourceTreeModel.frameForId(frameId) : null;
  }

  static setInitialFrameAttribution(uiSourceCode: Workspace.UISourceCode.UISourceCode, frameId: Protocol.Page.FrameId):
      void {
    if (!frameId) {
      return;
    }
    const frame = NetworkProject.resolveFrame(uiSourceCode, frameId);
    if (!frame) {
      return;
    }
    const attribution = new Map<Protocol.Page.FrameId, {
      frame: SDK.ResourceTreeModel.ResourceTreeFrame,
      count: number,
    }>();
    attribution.set(frameId, {frame, count: 1});
    uiSourceCodeToAttributionMap.set(uiSourceCode, attribution);
  }

  static cloneInitialFrameAttribution(
      fromUISourceCode: Workspace.UISourceCode.UISourceCode,
      toUISourceCode: Workspace.UISourceCode.UISourceCode): void {
    const fromAttribution = uiSourceCodeToAttributionMap.get(fromUISourceCode);
    if (!fromAttribution) {
      return;
    }
    const toAttribution = new Map<Protocol.Page.FrameId, {
      frame: SDK.ResourceTreeModel.ResourceTreeFrame,
      count: number,
    }>();
    for (const frameId of fromAttribution.keys()) {
      const value = fromAttribution.get(frameId);
      if (typeof value !== 'undefined') {
        toAttribution.set(frameId, {frame: value.frame, count: value.count});
      }
    }
    uiSourceCodeToAttributionMap.set(toUISourceCode, toAttribution);
  }

  static addFrameAttribution(uiSourceCode: Workspace.UISourceCode.UISourceCode, frameId: Protocol.Page.FrameId): void {
    const frame = NetworkProject.resolveFrame(uiSourceCode, frameId);
    if (!frame) {
      return;
    }
    const frameAttribution = uiSourceCodeToAttributionMap.get(uiSourceCode);
    if (!frameAttribution) {
      return;
    }
    const attributionInfo = frameAttribution.get(frameId) || {frame, count: 0};
    attributionInfo.count += 1;
    frameAttribution.set(frameId, attributionInfo);
    if (attributionInfo.count !== 1) {
      return;
    }

    const data = {uiSourceCode, frame};
    NetworkProjectManager.instance().dispatchEventToListeners(Events.FRAME_ATTRIBUTION_ADDED, data);
  }

  static removeFrameAttribution(uiSourceCode: Workspace.UISourceCode.UISourceCode, frameId: Protocol.Page.FrameId):
      void {
    const frameAttribution = uiSourceCodeToAttributionMap.get(uiSourceCode);
    if (!frameAttribution) {
      return;
    }
    const attributionInfo = frameAttribution.get(frameId);
    console.assert(Boolean(attributionInfo), 'Failed to remove frame attribution for url: ' + uiSourceCode.url());
    if (!attributionInfo) {
      return;
    }
    attributionInfo.count -= 1;
    if (attributionInfo.count > 0) {
      return;
    }
    frameAttribution.delete(frameId);
    const data = {uiSourceCode, frame: attributionInfo.frame};
    NetworkProjectManager.instance().dispatchEventToListeners(Events.FRAME_ATTRIBUTION_REMOVED, data);
  }

  static targetForUISourceCode(uiSourceCode: Workspace.UISourceCode.UISourceCode): SDK.Target.Target|null {
    return projectToTargetMap.get(uiSourceCode.project()) || null;
  }

  static setTargetForProject(project: Workspace.Workspace.Project, target: SDK.Target.Target): void {
    projectToTargetMap.set(project, target);
  }

  static getTargetForProject(project: Workspace.Workspace.Project): SDK.Target.Target|null {
    return projectToTargetMap.get(project) || null;
  }

  static framesForUISourceCode(uiSourceCode: Workspace.UISourceCode.UISourceCode):
      SDK.ResourceTreeModel.ResourceTreeFrame[] {
    const target = NetworkProject.targetForUISourceCode(uiSourceCode);
    const resourceTreeModel = target?.model(SDK.ResourceTreeModel.ResourceTreeModel);
    const attribution = uiSourceCodeToAttributionMap.get(uiSourceCode);
    if (!resourceTreeModel || !attribution) {
      return [];
    }
    const frames = Array.from(attribution.keys()).map(frameId => resourceTreeModel.frameForId(frameId));
    return frames.filter(frame => !!frame);
  }
}