/// <reference path="../../../../dist/preview release/babylon.d.ts"/>

module BABYLON.GUI {
    /**
     * Class used to create containers for controls
     */
    export class Container3D extends Control3D {
        private _blockLayout = false;

        /**
         * Gets the list of child controls
         */
        protected _children = new Array<Control3D>();

        /**
         * Gets the list of child controls
         */
        public get children(): Array<Control3D> {
            return this._children;
        }

        /**
         * Gets or sets a boolean indicating if the layout must be blocked (default is false).
         * This is helpful to optimize layout operation when adding multiple children in a row
         */
        public get blockLayout(): boolean {
            return this._blockLayout;
        }

        public set blockLayout(value: boolean) {
            if (this._blockLayout === value) {
                return;
            }

            this._blockLayout = value;

            if (!this._blockLayout) {
                this._arrangeChildren();
            }
        }

        /**
         * Creates a new container
         * @param name defines the container name
         */
        constructor(name?: string) {
            super(name);
        }

        /**
         * Gets a boolean indicating if the given control is in the children of this control
         * @param control defines the control to check
         * @returns true if the control is in the child list
         */
        public containsControl(control: Control3D): boolean {
            return this._children.indexOf(control) !== -1;
        }

        /**
         * Adds a control to the children of this control
         * @param control defines the control to add
         * @returns the current container
         */
        public addControl(control: Control3D): Container3D {
           var index = this._children.indexOf(control);

            if (index !== -1) {
                return this;
            }
            control.parent = this;
            control._host = this._host;

            this._children.push(control);

            if (this._host.utilityLayer) {
                control._prepareNode(this._host.utilityLayer.utilityLayerScene);

                if (control.node) {
                    control.node.parent = this.node;
                }

                if (!this.blockLayout) {
                    this._arrangeChildren();
                }
            }

            return this;
        }


        /**
         * This function will be called everytime a new control is added 
         */
        protected _arrangeChildren() {
        }

        protected _createNode(scene: Scene): Nullable<TransformNode> {
            return new TransformNode("ContainerNode", scene);
        }

        /**
         * Removes a control from the children of this control
         * @param control defines the control to remove
         * @returns the current container
         */
        public removeControl(control: Control3D): Container3D {
            var index = this._children.indexOf(control);

            if (index !== -1) {
                this._children.splice(index, 1);

                control.parent = null;
                control._disposeNode();
            }

            return this;
        }

        protected _getTypeName(): string {
            return "Container3D";
        }
        
        /**
         * Releases all associated resources
         */
        public dispose() {
            for (var control of this._children) {
                control.dispose();
            }

            this._children = [];

            super.dispose();
        }

        /** Control rotation will remain unchanged  */
        public static readonly UNSET_ORIENTATION = 0;

        /** Control will rotate to make it look at sphere central axis */
        public static readonly FACEORIGIN_ORIENTATION = 1;

        /** Control will rotate to make it look back at sphere central axis */
        public static readonly FACEORIGINREVERSED_ORIENTATION = 2;

        /** Control will rotate to look at z axis (0, 0, 1) */
        public static readonly FACEFORWARD_ORIENTATION = 3;

        /** Control will rotate to look at negative z axis (0, 0, -1) */
        public static readonly FACEFORWARDREVERSED_ORIENTATION = 4;

    }
}