"use strict";
/*
*  Copyright (C) 1998-2017 by Northwoods Software Corporation. All Rights Reserved.
*/

import * as go from "../release/go";

/**
* @constructor
* @extends Tool
* @class
* This GeometryReshapingTool class allows for a Shape's Geometry to be modified by the user
* via the dragging of tool handles. 
* This does not handle Links, whose routes should be reshaped by the LinkReshapingTool.
* The {@link #reshapeObjectName} needs to identify the named {@link Shape} within the
* selected {@link Part}.
* If the shape cannot be found or if its {@link Shape#geometry} is not of type {@link Geometry#Path},
* this will not show any GeometryReshaping {@link Adornment}.
* At the current time this tool does not support adding or removing {@link PathSegment}s to the Geometry.
*/

export class GeometryReshapingTool extends go.Tool {

	/** @type {GraphObject} */
	private _handleArchetype: go.GraphObject;

	constructor()
	{
		super();
		const h: go.Shape = new go.Shape();
		h.figure = "Diamond";
		h.desiredSize = new go.Size(7, 7);
		h.fill = "lightblue";
		h.stroke = "dodgerblue";
		h.cursor = "move";
		this._handleArchetype = h;
	}

	public readonly name = "GeometryReshaping";
	
	/** @type {string} */
	private _reshapeObjectName = 'SHAPE';  //??? can't add Part.reshapeObjectName property
	// there's no Part.reshapeAdornmentTemplate either

	// internal state
	/** @type {GraphObject} */
	private _handle: go.GraphObject = null;
	/** @type {Shape} */
	private _adornedShape: go.Shape = null;
	/** @type {Geometry} */
	private _originalGeometry: go.Geometry = null;  // in case the tool is cancelled and the UndoManager is not enabled

  /**
  * A small GraphObject used as a reshape handle for each segment.
  * The default GraphObject is a small blue diamond.
  * @name GeometryReshapingTool#handleArchetype 
  * @function.
  * @return {GraphObject}
  */
	get handleArchetype(): go.GraphObject { return this._handleArchetype }
	set handleArchetype(value: go.GraphObject) { this._handleArchetype = value }

  /**
  * The name of the GraphObject to be reshaped.
  * @name GeometryReshapingTool#reshapeObjectName
  * @function.
  * @return {string}
  */
	get reshapeObjectName(): string { return this._reshapeObjectName }
	set reshapeObjectName(value: string) { this._reshapeObjectName = value }

  /**
  * This read-only property returns the {@link GraphObject} that is the tool handle being dragged by the user.
  * This will be contained by an {@link Adornment} whose category is "GeometryReshaping".
  * Its {@link Adornment#adornedObject} is the same as the {@link #adornedShape}.
  * @name GeometryReshapingTool#handle
  * @function.
  * @return {GraphObject}
  */
	get handle(): go.GraphObject { return this._handle }

  /**
  * Gets the {@link Shape} that is being reshaped.
  * This must be contained within the selected Part.
  * @name GeometryReshapingTool#adornedShape
  * @function.
  * @return {Shape}
  */
	get adornedShape(): go.Shape { return this._adornedShape }

  /**
  * This read-only property remembers the original value for {@link Shape#geometry},
  * so that it can be restored if this tool is cancelled.
  * @name GeometryReshapingTool#originalGeometry
  * @function.
  * @return {Geometry}
  */
	get originalGeometry(): go.Geometry { return this._originalGeometry }


  /**
  * Show an {@link Adornment} with a reshape handle at each point of the geometry.
  * Don't show anything if {@link #reshapeObjectName} doesn't identify a {@link Shape}
  * that has a {@link Shape#geometry} of type {@link Geometry#Path}.
  * @this {GeometryReshapingTool}
  * @param {Part} part the part.
  */
	public updateAdornments(part: go.Part) {
		if (part === null || part instanceof go.Link) return;  // this tool never applies to Links
		if (part.isSelected && !this.diagram.isReadOnly) {
			var selelt = part.findObject(this.reshapeObjectName);
			if (selelt instanceof go.Shape && selelt.actualBounds.isReal() && selelt.isVisibleObject() &&
				part.canReshape() && part.actualBounds.isReal() && part.isVisible() &&
				selelt.geometry.type === go.Geometry.Path) {
				var adornment = part.findAdornment(this.name);
				if (adornment === null) {
					adornment = this.makeAdornment(selelt);
				}
				if (adornment !== null) {
					// update the position/alignment of each handle
					var geo = selelt.geometry;
					var b = geo.bounds;
					// update the size of the adornment
					adornment.findObject("BODY").desiredSize = b.size;
					adornment.elements.each(function (h: any) {
						if (h._typ === undefined) return;
						var fig = geo.figures.elt(h._fig);
						var seg = fig.segments.elt(h._seg);
						var x = 0;
						var y = 0;
						switch (h._typ) {
							case 0: x = fig.startX; y = fig.startY; break;
							case 1: x = seg.endX; y = seg.endY; break;
							case 2: x = seg.point1X; y = seg.point1Y; break;
							case 3: x = seg.point2X; y = seg.point2Y; break;
						}
						var bw = b.width;
						if (bw === 0) bw = 0.001;
						var bh = b.height;
						if (bh === 0) bh = 0.001;
						h.alignment = new go.Spot(Math.max(0, Math.min((x - b.x) / bw, 1)),
							Math.max(0, Math.min((y - b.y) / bh, 1)));
					});

					part.addAdornment(this.name, adornment);
					adornment.location = selelt.getDocumentPoint(go.Spot.TopLeft);
					adornment.angle = selelt.getDocumentAngle();
					return;
				}
			}
		}
		part.removeAdornment(this.name);
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public makeAdornment(selelt: go.Shape) {
		var adornment = new go.Adornment();
		adornment.type = go.Panel.Spot;
		adornment.locationObjectName = "BODY";
		adornment.locationSpot = new go.Spot(0, 0, -selelt.strokeWidth / 2, -selelt.strokeWidth / 2);
		var h: any = new go.Shape();
		h.name = "BODY";
		h.fill = null;
		h.stroke = null;
		h.strokeWidth = 0;
		adornment.add(h);

		var geo = selelt.geometry;
		// requires Path Geometry, checked above in updateAdornments
		for (var f = 0; f < geo.figures.count; f++) {
			var fig = geo.figures.elt(f);
			for (var g = 0; g < fig.segments.count; g++) {
				var seg = fig.segments.elt(g);
				var h;
				if (g === 0) {
					h = this.makeHandle(selelt, fig, seg);
					if (h !== null) {
						h._typ = 0;
						h._fig = f;
						h._seg = g;
						adornment.add(h);
					}
				}
				h = this.makeHandle(selelt, fig, seg);
				if (h !== null) {
					h._typ = 1;
					h._fig = f;
					h._seg = g;
					adornment.add(h);
				}
				if (seg.type === go.PathSegment.QuadraticBezier || seg.type === go.PathSegment.Bezier) {
					h = this.makeHandle(selelt, fig, seg);
					if (h !== null) {
						h._typ = 2;
						h._fig = f;
						h._seg = g;
						adornment.add(h);
					}
					if (seg.type === go.PathSegment.Bezier) {
						h = this.makeHandle(selelt, fig, seg);
						if (h !== null) {
							h._typ = 3;
							h._fig = f;
							h._seg = g;
							adornment.add(h);
						}
					}
				}
			}
		}
		adornment.category = this.name;
		adornment.adornedObject = selelt;
		return adornment;
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public makeHandle(selelt: go.GraphObject, fig: go.PathFigure, seg: go.PathSegment) {
		var h = this.handleArchetype;
		if (h === null) return null;
		return h.copy();
	};


  /**
  * @this {GeometryReshapingTool}
  */
	public canStart() {
		if (!this.isEnabled) return false;

		var diagram = this.diagram;
		if (diagram === null || diagram.isReadOnly) return false;
		if (!diagram.allowReshape) return false;
		if (!diagram.lastInput.left) return false;
		var h = this.findToolHandleAt(diagram.firstInput.documentPoint, this.name);
		return (h !== null);
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public doActivate() {
		var diagram = this.diagram;
		if (diagram === null) return;
		this._handle = this.findToolHandleAt(diagram.firstInput.documentPoint, this.name);
		if (this._handle === null) return;
		var shape = (this.handle.part as go.Adornment).adornedObject as go.Shape;
		if (!shape) return;
		this._adornedShape = shape;
		diagram.isMouseCaptured = true;
		this.startTransaction(this.name);
		this._originalGeometry = shape.geometry;
		this.isActive = true;
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public doDeactivate() {
		this.stopTransaction();

		this._handle = null;
		this._adornedShape = null;
		var diagram = this.diagram;
		if (diagram !== null) diagram.isMouseCaptured = false;
		this.isActive = false;
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public doCancel() {
		var shape = this._adornedShape;
		if (shape !== null) {
			// explicitly restore the original route, in case !UndoManager.isEnabled
			shape.geometry = this._originalGeometry;
		}
		this.stopTool();
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public doMouseMove() {
		var diagram = this.diagram;
		if (this.isActive && diagram !== null) {
			var newpt = this.computeReshape(diagram.lastInput.documentPoint);
			this.reshape(newpt);
		}
	};

  /**
  * @this {GeometryReshapingTool}
  */
	public doMouseUp() {
		var diagram = this.diagram;
		if (this.isActive && diagram !== null) {
			var newpt = this.computeReshape(diagram.lastInput.documentPoint);
			this.reshape(newpt);
			this.transactionResult = this.name;  // success
		}
		this.stopTool();
	};

  /**
  * @expose
  * @this {GeometryReshapingTool}
  * @param {Point} newPoint the value of the call to {@link #computeReshape}.
  */
	public reshape(newPoint: go.Point) {
		var shape = this.adornedShape;
		var locpt = shape.getLocalPoint(newPoint);
		var geo = shape.geometry.copy();
		shape.desiredSize = new go.Size(NaN, NaN); // set the desiredSize once we've gotten our Geometry so we don't clobber
		var type = (this.handle as any)._typ;
		if (type === undefined) return;
		var fig = geo.figures.elt((this.handle as any)._fig);
		var seg = fig.segments.elt((this.handle as any)._seg);
		switch (type) {
			case 0: fig.startX = locpt.x; fig.startY = locpt.y; break;
			case 1: seg.endX = locpt.x; seg.endY = locpt.y; break;
			case 2: seg.point1X = locpt.x; seg.point1Y = locpt.y; break;
			case 3: seg.point2X = locpt.x; seg.point2Y = locpt.y; break;
		}
		var offset = geo.normalize();  // avoid any negative coordinates in the geometry
		shape.geometry = geo;  // modify the Shape
		var part = shape.part;  // move the Part holding the Shape
		if (!part.locationSpot.equals(go.Spot.Center)) {  // but only if the locationSpot isn't Center
			part.move(part.position.copy().subtract(offset));
		}
		this.updateAdornments(part);  // update any Adornments of the Part
		this.diagram.maybeUpdate();  // force more frequent drawing for smoother looking behavior
	};


  /**
  * @expose
  * @this {GeometryReshapingTool}
  * @param {Point} p the point where the handle is being dragged.
  * @return {Point}
  */
	public computeReshape(p: go.Point) {
		return p;  // no constraints on the points
	};

}