/*
*  Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
*/

/*
* This is an extension and not part of the main GoJS library.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/

import * as go from '../release/go-module.js';

/**
 * A class for simulating mouse and keyboard input.
 *
 * As a special hack, this supports limited simulation of drag-and-drop between Diagrams,
 * by setting both the `sourceDiagram` and `targetDiagram` properties
 * on the `eventprops` argument of the mouseDown/mouseMove/mouseUp methods.
 * Although {@link InputEvent#targetDiagram} is a real property,
 * the `sourceDiagram` property is only used by these Robot methods.
 *
 * If you want to experiment with this extension, try the <a href="../../extensionsTS/Robot.html">Simulating Input</a> sample.
 * @category Extension
 */
export class Robot {
  private _diagram: go.Diagram;

  /**
   * Construct a robot for a given {@link Diagram}. If none is provided, a new Diagram will be created.
   */
  constructor(dia?: go.Diagram) {
    if (dia instanceof go.Diagram) {
      this._diagram = dia;
    } else {
      this._diagram = new go.Diagram();
    }
  }

  /**
   * Gets or sets the {@link Diagram} associated with this Robot.
   */
  get diagram(): go.Diagram { return this._diagram; }
  set diagram(val: go.Diagram) {
    if (!(val instanceof go.Diagram)) throw new Error('Robot.diagram must be a Diagram, not: ' + val);
    this._diagram = val;
  }

  /**
   * @hidden @internal
   * Transfer property settings from a JavaScript Object to an {@link InputEvent}.
   */
  public initializeEvent(e: go.InputEvent, props?: go.ObjectData): void {
    if (!props) return;
    for (const p in props) {
      if (p !== 'sourceDiagram') (e as any)[p] = (props as any)[p];
    }
  }

  /**
   * Simulate a mouse down event.
   * @param {number} x the X-coordinate of the mouse point in document coordinates.
   * @param {number} y the Y-coordinate of the mouse point in document coordinates.
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public mouseDown(x: number, y: number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof x !== 'number' || typeof y !== 'number') throw new Error('Robot.mouseDown first two args must be X,Y numbers');
    if (time === undefined) time = 0;

    let diagram = this._diagram;
    if (eventprops && (eventprops as any).sourceDiagram) diagram = (eventprops as any).sourceDiagram;
    if (!diagram.isEnabled) return;

    const n = new go.InputEvent();
    n.diagram = diagram;
    n.documentPoint = new go.Point(x, y);
    n.viewPoint = diagram.transformDocToView(n.documentPoint);
    n.timestamp = time;
    n.down = true;
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    diagram.firstInput = n.copy();
    diagram.currentTool.doMouseDown();
  }

  /**
   * Simulate a mouse move event.
   * @param {number} x the X-coordinate of the mouse point in document coordinates.
   * @param {number} y the Y-coordinate of the mouse point in document coordinates.
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public mouseMove(x: number, y: number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof x !== 'number' || typeof y !== 'number') throw new Error('Robot.mouseMove first two args must be X,Y numbers');
    if (time === undefined) time = 0;

    let diagram = this._diagram;
    if (eventprops && (eventprops as any).sourceDiagram) diagram = (eventprops as any).sourceDiagram;
    if (!diagram.isEnabled) return;

    const n = new go.InputEvent();
    n.diagram = diagram;
    n.documentPoint = new go.Point(x, y);
    n.viewPoint = diagram.transformDocToView(n.documentPoint);
    n.timestamp = time;
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    diagram.currentTool.doMouseMove();
  }

  /**
   * Simulate a mouse up event.
   * @param {number} x the X-coordinate of the mouse point in document coordinates.
   * @param {number} y the Y-coordinate of the mouse point in document coordinates.
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public mouseUp(x: number, y: number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof x !== 'number' || typeof y !== 'number') throw new Error('Robot.mouseUp first two args must be X,Y numbers');
    if (time === undefined) time = 0;

    let diagram = this._diagram;
    if (eventprops && (eventprops as any).sourceDiagram) diagram = (eventprops as any).sourceDiagram;
    if (!diagram.isEnabled) return;

    const n: go.InputEvent = new go.InputEvent();
    n.diagram = diagram;
    n.documentPoint = new go.Point(x, y);
    n.viewPoint = diagram.transformDocToView(n.documentPoint);
    n.timestamp = time;
    n.up = true;
    if (diagram.firstInput.documentPoint.equals(n.documentPoint)) n.clickCount = 1;  // at least??
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    // if (diagram.simulatedMouseUp(null, (n as any).sourceDiagram, n.documentPoint, n.targetDiagram)) return;
    diagram.currentTool.doMouseUp();
  }

  /**
   * Simulate a mouse wheel event.
   * @param {number} delta non-zero turn
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public mouseWheel(delta: number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof delta !== 'number') throw new Error('Robot.mouseWheel first arg must be DELTA number');
    if (time === undefined) time = 0;

    const diagram = this._diagram;
    if (!diagram.isEnabled) return;

    const n = diagram.lastInput.copy();
    n.diagram = diagram;
    n.delta = delta;
    n.timestamp = time;
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    diagram.currentTool.doMouseWheel();
  }

  /**
   * Simulate a key down event.
   * @param {string|number} keyorcode
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public keyDown(keyorcode: string | number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof keyorcode !== 'string' && typeof keyorcode !== 'number') throw new Error('Robot.keyDown first arg must be a string or a number');
    if (time === undefined) time = 0;

    const diagram = this._diagram;
    if (!diagram.isEnabled) return;

    const n = diagram.lastInput.copy();
    n.diagram = diagram;
    if (typeof (keyorcode) === 'string') {
      n.key = keyorcode;
    } else if (typeof (keyorcode) === 'number') {
      n.key = String.fromCharCode(keyorcode);
    }
    n.timestamp = time;
    n.down = true;
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    diagram.currentTool.doKeyDown();
  }

  /**
   * Simulate a key up event.
   * @param {string|number} keyorcode
   * @param {number=} time the timestamp of the simulated event, in milliseconds; default zero
   * @param {Object=} eventprops an optional argument providing properties for the InputEvent.
   */
  public keyUp(keyorcode: string | number, time?: number, eventprops?: go.ObjectData): void {
    if (typeof keyorcode !== 'string' && typeof keyorcode !== 'number') throw new Error('Robot.keyUp first arg must be a string or a number');
    if (time === undefined) time = 0;

    const diagram = this._diagram;
    if (!diagram.isEnabled) return;

    const n = diagram.lastInput.copy();
    n.diagram = diagram;
    if (typeof (keyorcode) === 'string') {
      n.key = keyorcode;
    } else if (typeof (keyorcode) === 'number') {
      n.key = String.fromCharCode(keyorcode);
    }
    n.timestamp = time;
    n.up = true;
    this.initializeEvent(n, eventprops);
    diagram.lastInput = n;
    diagram.currentTool.doKeyUp();
  }

}
