/**
 * @class Ext.grid.GridDragZone
 * @extends Ext.dd.DragZone
 * <p>A customized implementation of a {@link Ext.dd.DragZone DragZone} which provides default implementations of two of the
 * template methods of DragZone to enable dragging of the selected rows of a GridPanel.</p>
 * <p>A cooperating {@link Ext.dd.DropZone DropZone} must be created who's template method implementations of
 * {@link Ext.dd.DropZone#onNodeEnter onNodeEnter}, {@link Ext.dd.DropZone#onNodeOver onNodeOver},
 * {@link Ext.dd.DropZone#onNodeOut onNodeOut} and {@link Ext.dd.DropZone#onNodeDrop onNodeDrop}</p> are able
 * to process the {@link #getDragData data} which is provided.
 */
Ext.grid.GridDragZone = function(grid, config){
    this.view = grid.getView();
    Ext.grid.GridDragZone.superclass.constructor.call(this, this.view.mainBody.dom, config);
    this.scroll = false;
    this.grid = grid;
    this.ddel = document.createElement('div');
    this.ddel.className = 'x-grid-dd-wrap';
    // prevent the default action, but don't stop propagation
    this.preventDefault = true;
};

Ext.extend(Ext.grid.GridDragZone, Ext.dd.DragZone, {
    ddGroup : "GridDD",

    /**
     * <p>The provided implementation of the getDragData method which collects the data to be dragged from the GridPanel on mousedown.</p>
     * <p>This data is available for processing in the {@link Ext.dd.DropZone#onNodeEnter onNodeEnter}, {@link Ext.dd.DropZone#onNodeOver onNodeOver},
     * {@link Ext.dd.DropZone#onNodeOut onNodeOut} and {@link Ext.dd.DropZone#onNodeDrop onNodeDrop} methods of a cooperating {@link Ext.dd.DropZone DropZone}.</p>
     * <p>The data object contains the following properties:<ul>
     * <li><b>grid</b> : Ext.Grid.GridPanel<div class="sub-desc">The GridPanel from which the data is being dragged.</div></li>
     * <li><b>ddel</b> : htmlElement<div class="sub-desc">An htmlElement which provides the "picture" of the data being dragged.</div></li>
     * <li><b>rowIndex</b> : Number<div class="sub-desc">The index of the row which receieved the mousedown gesture which triggered the drag.</div></li>
     * <li><b>selections</b> : Array<div class="sub-desc">Array of the selected Records which are being dragged from the GridPanel.
     * Unless a CellSelectionModel is being used and the grid is configured <code>dragCell: true</code>, in which case, this will be
     * an Array containing the single selected cell data as <code>[rowIndex, cellIndex]</code>.</div></li>
     * </ul></p>
     */
    getDragData : function(e){
        var t = Ext.lib.Event.getTarget(e),
            sm,
            rowIndex = this.view.findRowIndex(t),
            cellIndex,
            selectedCell,
            selection;

        if (rowIndex !== false){
            sm = this.grid.selModel;

            // Handle mousedown on unselected items (depending on what kind of selection we are using)
            // Select the mousedowned item
            if (sm.getSelectedCell) {
                cellIndex = this.view.findCellIndex(t);
                selectedCell = sm.getSelectedCell();
                if (!selectedCell || selectedCell[0] !== rowIndex || selectedCell[1] !== cellIndex) {
                    sm.handleMouseDown(this.grid, rowIndex, cellIndex, e);
                }
                if (this.grid.dragCell) {
                    // Selection is the cell coordinates
                    selection = sm.getSelectedCell();
                    if (!this.grid.hasOwnProperty('ddText')) {
                        this.grid.ddText = '{0} selected cell{1}';
                    }
                } else {
                    // Selection is the mousedowned row
                    selection = [this.grid.store.getAt(rowIndex)];
                }
            } else {
                if(!sm.isSelected(rowIndex) || e.hasModifier()){
                    sm.handleMouseDown(this.grid, rowIndex, e);
                }
                selection = sm.getSelections();
            }
            return {grid: this.grid, ddel: this.ddel, rowIndex: rowIndex, selections: selection};
        }
        return false;
    },

    /**
     * <p>The provided implementation of the onInitDrag method. Sets the <tt>innerHTML</tt> of the drag proxy which provides the "picture"
     * of the data being dragged.</p>
     * <p>The <tt>innerHTML</tt> data is found by calling the owning GridPanel's {@link Ext.grid.GridPanel#getDragDropText getDragDropText}.</p>
     */
    onInitDrag : function(e){
        var data = this.dragData;
        this.ddel.innerHTML = this.grid.getDragDropText();
        this.proxy.update(this.ddel);
        // fire start drag?
    },

    /**
     * An empty immplementation. Implement this to provide behaviour after a repair of an invalid drop. An implementation might highlight
     * the selected rows to show that they have not been dragged.
     */
    afterRepair : function(){
        this.dragging = false;
    },

    /**
     * <p>An empty implementation. Implement this to provide coordinates for the drag proxy to slide back to after an invalid drop.</p>
     * <p>Called before a repair of an invalid drop to get the XY to animate to.</p>
     * @param {EventObject} e The mouse up event
     * @return {Array} The xy location (e.g. [100, 200])
     */
    getRepairXY : function(e, data){
        return false;
    },

    onEndDrag : function(data, e){
        // fire end drag?
    },

    onValidDrop : function(dd, e, id){
        // fire drag drop?
        this.hideProxy();
    },

    beforeInvalidDrop : function(e, id){

    }
});