/**
 * Extended Node interface for managing regions and screen positioning.
 * Adds support for positioning elements and normalizes window size and scroll detection. 
 * @module node
 * @submodule node-screen
 */

// these are all "safe" returns, no wrapping required
Y.each([
    /**
     * Returns the inner width of the viewport (exludes scrollbar). 
     * @config winWidth
     * @for Node
     * @type {Int}
     */
    'winWidth',

    /**
     * Returns the inner height of the viewport (exludes scrollbar). 
     * @config winHeight
     * @type {Int}
     */
    'winHeight',

    /**
     * Document width 
     * @config docWidth
     * @type {Int}
     */
    'docWidth',

    /**
     * Document height 
     * @config docHeight
     * @type {Int}
     */
    'docHeight',

    /**
     * Pixel distance the page has been scrolled horizontally 
     * @config docScrollX
     * @type {Int}
     */
    'docScrollX',

    /**
     * Pixel distance the page has been scrolled vertically 
     * @config docScrollY
     * @type {Int}
     */
    'docScrollY'
    ],
    function(name) {
        Y.Node.ATTRS[name] = {
            getter: function() {
                var args = Array.prototype.slice.call(arguments);
                args.unshift(Y.Node.getDOMNode(this));

                return Y.DOM[name].apply(this, args);
            }
        };
    }
);

Y.Node.ATTRS.scrollLeft = {
    getter: function() {
        var node = Y.Node.getDOMNode(this);
        return ('scrollLeft' in node) ? node.scrollLeft : Y.DOM.docScrollX(node);
    },

    setter: function(val) {
        var node = Y.Node.getDOMNode(this);
        if (node) {
            if ('scrollLeft' in node) {
                node.scrollLeft = val;
            } else if (node.document || node.nodeType === 9) {
                Y.DOM._getWin(node).scrollTo(val, Y.DOM.docScrollY(node)); // scroll window if win or doc
            }
        } else {
            Y.log('unable to set scrollLeft for ' + node, 'error', 'Node');
        }
    }
};

Y.Node.ATTRS.scrollTop = {
    getter: function() {
        var node = Y.Node.getDOMNode(this);
        return ('scrollTop' in node) ? node.scrollTop : Y.DOM.docScrollY(node);
    },

    setter: function(val) {
        var node = Y.Node.getDOMNode(this);
        if (node) {
            if ('scrollTop' in node) {
                node.scrollTop = val;
            } else if (node.document || node.nodeType === 9) {
                Y.DOM._getWin(node).scrollTo(Y.DOM.docScrollX(node), val); // scroll window if win or doc
            }
        } else {
            Y.log('unable to set scrollTop for ' + node, 'error', 'Node');
        }
    }
};

Y.Node.importMethod(Y.DOM, [
/**
 * Gets the current position of the node in page coordinates. 
 * @method getXY
 * @for Node
 * @return {Array} The XY position of the node
*/
    'getXY',

/**
 * Set the position of the node in page coordinates, regardless of how the node is positioned.
 * @method setXY
 * @param {Array} xy Contains X & Y values for new position (coordinates are page-based)
 * @chainable
 */
    'setXY',

/**
 * Gets the current position of the node in page coordinates. 
 * @method getX
 * @return {Int} The X position of the node
*/
    'getX',

/**
 * Set the position of the node in page coordinates, regardless of how the node is positioned.
 * @method setX
 * @param {Int} x X value for new position (coordinates are page-based)
 * @chainable
 */
    'setX',

/**
 * Gets the current position of the node in page coordinates. 
 * @method getY
 * @return {Int} The Y position of the node
*/
    'getY',

/**
 * Set the position of the node in page coordinates, regardless of how the node is positioned.
 * @method setY
 * @param {Int} y Y value for new position (coordinates are page-based)
 * @chainable
 */
    'setY',

/**
 * Swaps the XY position of this node with another node. 
 * @method swapXY
 * @param {Node | HTMLElement} otherNode The node to swap with.
 * @chainable
 */
    'swapXY'
]);