/**
 * Physics Shape Superset
 * @param engine R3.D3.Engine
 * @param shapeType
 * @param scale R3.API.Vector3
 * @param vertices Number[]
 * @param indices Number[]
 * @param radius Number
 * @param halfExtensions R3.API.Vector3
 * @param radiusTop Number
 * @param radiusBottom Number
 * @param height Number
 * @param numSegments Number
 * @param heightmap R3.D3.Heightmap
 * @param elementSize
 * @constructor
 */
R3.D3.Shape = function(
    engine,
    shapeType,
    scale,
    vertices,
    indices,
    radius,
    halfExtensions,
    radiusTop,
    radiusBottom,
    height,
    numSegments,
    heightmap
) {

    this.engine = engine;

    this.engine.isNotCannonThrow();

    this.shapeType = shapeType;

    if (typeof scale == 'undefined') {
        scale = new R3.API.Vector3(1, 1, 1)
    }
    this.scale = scale;

    if (typeof vertices == 'undefined') {
        vertices = [];
    }
    this.vertices = vertices;

    if (typeof indices == 'undefined') {
        indices = [];
    }
    this.indices = indices;

    if (typeof radius == 'undefined') {
        radius = 1;
    }
    this.radius = radius;

    if (typeof halfExtensions == 'undefined') {
        halfExtensions = new R3.API.Vector3(1,1,1);
    }
    this.halfExtensions = halfExtensions;

    if (typeof radiusTop == 'undefined') {
        radiusTop = 1;
    }
    this.radiusTop = radiusTop;

    if (typeof radiusBottom == 'undefined') {
        radiusBottom = 1;
    }
    this.radiusBottom = radiusBottom;

    if (typeof height == 'undefined') {
        height = 1;
    }
    this.height = height;

    if (typeof numSegments == 'undefined') {
        numSegments = 1;
    }
    this.numSegments = numSegments;

    if (typeof heightmap == 'undefined') {
        heightmap = new R3.D3.Heightmap();
    }
    this.heightmap = heightmap;

    this.instance = this.createInstance();
};

/**
 * Shape constants
 * @type {number}
 */
R3.D3.Shape.SHAPE_TYPE_SPHERE        = 1;
R3.D3.Shape.SHAPE_TYPE_BOX           = 2;
R3.D3.Shape.SHAPE_TYPE_TRIMESH       = 3;
R3.D3.Shape.SHAPE_TYPE_CYLINDER      = 4;
R3.D3.Shape.SHAPE_TYPE_HEIGHT_MAP    = 5;
R3.D3.Shape.SHAPE_TYPE_CONVEX_HULL   = 6;
R3.D3.Shape.SHAPE_TYPE_PLANE         = 7;

/**
 *
 */
R3.D3.Shape.prototype.createInstance = function() {

    var instance = null;

    if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_TRIMESH) {

    } else if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_SPHERE) {;
    } else if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_BOX) {

    } else if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_CYLINDER) {

    } else if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_HEIGHT_MAP) {

    } else if (this.shapeType == R3.D3.Shape.SHAPE_TYPE_CONVEX_HULL) {

        instance = new this.engine.instance.ConvexPolyhedron(
            this.vertices, this.indices
        );

    } else if(this.shapeType == R3.D3.Shape.SHAPE_TYPE_PLANE) {
        instance = new this.engine.instance.Plane();
    } else {
        console.warn('Shape type not implemented: ' + this.shapeType);
        throw new Error('Shape type not implemented: ' + this.shapeType);
    }

    this.instance = instance;

    return instance;
};


/**
 * update
 */
R3.D3.Shape.prototype.update = function(
    engine
) {
    engine.isNotCannonThrow();

    if(this.shapeType === R3.D3.Shape.SHAPE_TYPE_TRIMESH) {
        this.instance.setScale(
            new engine.instance.Vec3(
                this.scale.x,
                this.scale.y,
                this.scale.z
            )
        );
        this.instance.updateAABB();
        this.instance.updateNormals();
        this.instance.updateEdges();
        this.instance.updateBoundingSphereRadius();
        this.instance.updateTree();
    }
};

/**
 * Converts a R3.D3.Shape to a R3.D3.API.Shape
 * @returns {R3.D3.API.Shape}
 */
R3.D3.Shape.prototype.toApiShape = function() {

    return new R3.D3.API.Shape(
        this.engine.toApiEngine(),
        this.shapeType,
        this.scale.toApiVector(),
        this.vertices,
        this.indices,
        this.radius,
        this.halfExtensions,
        this.radiusTop,
        this.radiusBottom,
        this.height,
        this.numSegments,
        this.heightmap.toApiHeightMap()
    )

};

/**
 * Converts from an Object to a Shape
 * @param graphics R3.D3.Graphics
 * @param objectShape Object
 * @constructor
 */
R3.D3.Shape.FromObjectShape = function(graphics, objectShape) {
    //todo: implement this still
    return null;
};