var math = require('../math'),
    TransformBase = require('./TransformBase');

/**
 * Transform that takes care about its versions
 *
 * @class
 * @extends PIXI.TransformBase
 * @memberof PIXI
 */
class TransformStatic extends TransformBase { 
    constructor()
    {
        super();
         /**
         * The coordinate of the object relative to the local coordinates of the parent.
         *
         * @member {PIXI.ObservablePoint}
         */
        this.position = new math.ObservablePoint(this.onChange, this,0,0);

        /**
         * The scale factor of the object.
         *
         * @member {PIXI.ObservablePoint}
         */
        this.scale = new math.ObservablePoint(this.onChange, this,1,1);

        /**
         * The pivot point of the displayObject that it rotates around
         *
         * @member {PIXI.ObservablePoint}
         */
        this.pivot = new math.ObservablePoint(this.onChange, this,0, 0);

        /**
         * The skew amount, on the x and y axis.
         *
         * @member {PIXI.ObservablePoint}
         */
        this.skew = new math.ObservablePoint(this.updateSkew, this,0, 0);

        this._rotation = 0;

        this._sr = Math.sin(0);
        this._cr = Math.cos(0);
        this._cy  = Math.cos(0);//skewY);
        this._sy  = Math.sin(0);//skewY);
        this._nsx = Math.sin(0);//skewX);
        this._cx  = Math.cos(0);//skewX);

        this._localID = 0;
        this._currentLocalID = 0;
    }

    onChange()
    {
        this._localID ++;
    }

    updateSkew()
    {
        this._cy  = Math.cos(this.skew._y);
        this._sy  = Math.sin(this.skew._y);
        this._nsx = Math.sin(this.skew._x);
        this._cx  = Math.cos(this.skew._x);

        this._localID ++;
    }

    /**
     * Updates only local matrix
     */
    updateLocalTransform() {
        var lt = this.localTransform;
        if(this._localID !== this._currentLocalID)
        {
            // get the matrix values of the displayobject based on its transform properties..
            var a,b,c,d;

            a  =  this._cr * this.scale._x;
            b  =  this._sr * this.scale._x;
            c  = -this._sr * this.scale._y;
            d  =  this._cr * this.scale._y;

            lt.a  = this._cy * a + this._sy * c;
            lt.b  = this._cy * b + this._sy * d;
            lt.c  = this._nsx * a + this._cx * c;
            lt.d  = this._nsx * b + this._cx * d;

            lt.tx =  this.position._x - (this.pivot._x * lt.a + this.pivot._y * lt.c);
            lt.ty =  this.position._y - (this.pivot._x * lt.b + this.pivot._y * lt.d);
            this._currentLocalID = this._localID;

            // force an update..
            this._parentID = -1;
        }
    }

    /**
     * Updates the values of the object and applies the parent's transform.
     * @param parentTransform {PIXI.Transform} The transform of the parent of this object
     *
     */
    updateTransform(parentTransform)
    {
        var pt = parentTransform.worldTransform;
        var wt = this.worldTransform;
        var lt = this.localTransform;

        if(this._localID !== this._currentLocalID)
        {
            // get the matrix values of the displayobject based on its transform properties..
            var a,b,c,d;

            a  =  this._cr * this.scale._x;
            b  =  this._sr * this.scale._x;
            c  = -this._sr * this.scale._y;
            d  =  this._cr * this.scale._y;

            lt.a  = this._cy * a + this._sy * c;
            lt.b  = this._cy * b + this._sy * d;
            lt.c  = this._nsx * a + this._cx * c;
            lt.d  = this._nsx * b + this._cx * d;

            lt.tx =  this.position._x - (this.pivot._x * lt.a + this.pivot._y * lt.c);
            lt.ty =  this.position._y - (this.pivot._x * lt.b + this.pivot._y * lt.d);
            this._currentLocalID = this._localID;

            // force an update..
            this._parentID = -1;
        }

        if(this._parentID !== parentTransform._worldID)
        {
            // concat the parent matrix with the objects transform.
            wt.a  = lt.a  * pt.a + lt.b  * pt.c;
            wt.b  = lt.a  * pt.b + lt.b  * pt.d;
            wt.c  = lt.c  * pt.a + lt.d  * pt.c;
            wt.d  = lt.c  * pt.b + lt.d  * pt.d;
            wt.tx = lt.tx * pt.a + lt.ty * pt.c + pt.tx;
            wt.ty = lt.tx * pt.b + lt.ty * pt.d + pt.ty;

            this._parentID = parentTransform._worldID;

            // update the id of the transform..
            this._worldID ++;
        }
    }

    /**
     * Decomposes a matrix and sets the transforms properties based on it.
     * @param {PIXI.Matrix} The matrix to decompose
     */
    setFromMatrix(matrix)
    {
        matrix.decompose(this);
        this._localID ++;
    }

}

Object.defineProperties(TransformStatic.prototype, {
    /**
     * The rotation of the object in radians.
     *
     * @member {number}
     * @memberof PIXI.TransformStatic#
     */
    rotation: {
        get: function () {
            return this._rotation;
        },
        set: function (value) {
            this._rotation = value;
            this._sr = Math.sin(value);
            this._cr = Math.cos(value);
            this._localID ++;
        }
    }
});

module.exports = TransformStatic;