/**
 * @class YAHOO.ext.grid.PagedGridView
 * @extends YAHOO.ext.grid.GridView
 * Extends the default GridView to add a paging interface.
 * @constructor
 * This class is created for you automatically if your data model is set to use paging.
 */
YAHOO.ext.grid.PagedGridView = function(){
    YAHOO.ext.grid.PagedGridView.superclass.constructor.call(this);
    this.cursor = 1;
};

YAHOO.extendX(YAHOO.ext.grid.PagedGridView, YAHOO.ext.grid.GridView, {
    appendFooter : function(parentEl){
        var fwrap = document.createElement('div');
        fwrap.className = 'ygrid-wrap-footer';
        var fbody = document.createElement('span');
        fbody.className = 'ygrid-footer';
        fwrap.appendChild(fbody);
        parentEl.appendChild(fwrap);
        this.createPagingToolbar(fbody);
        return fwrap;
    },

    createPagingToolbar : function(container){
        var tb = new YAHOO.ext.Toolbar(container);
        this.pageToolbar = tb;
        this.first = tb.addButton({
            tooltip: this.firstText, 
            className: 'ygrid-page-first',
            disabled: true,
            click: this.onClick.createDelegate(this, ['first'])
        });
        this.prev = tb.addButton({
            tooltip: this.prevText, 
            className: 'ygrid-page-prev', 
            disabled: true,
            click: this.onClick.createDelegate(this, ['prev'])
        });
        tb.addSeparator();
        tb.add(this.beforePageText);
        var pageBox = document.createElement('input');
        pageBox.type = 'text';
        pageBox.size = 3;
        pageBox.value = '1';
        pageBox.className = 'ygrid-page-number';
        tb.add(pageBox);
        this.field = getEl(pageBox, true);
        this.field.mon('keydown', this.onEnter, this, true);
        this.field.on('focus', function(){pageBox.select();});
        this.afterTextEl = tb.addText(this.afterPageText.replace('%0', '1'));
        this.field.setHeight(18);
        tb.addSeparator();
        this.next = tb.addButton({
            tooltip: this.nextText, 
            className: 'ygrid-page-next', 
            disabled: true,
            click: this.onClick.createDelegate(this, ['next'])
        });
        this.last = tb.addButton({
            tooltip: this.lastText, 
            className: 'ygrid-page-last', 
            disabled: true,
            click: this.onClick.createDelegate(this, ['last'])
        });
        tb.addSeparator();
        this.loading = tb.addButton({
            tooltip: this.refreshText, 
            className: 'ygrid-loading',
            disabled: true,
            click: this.onClick.createDelegate(this, ['refresh'])
        });
        this.onPageLoaded(1, this.grid.dataModel.getTotalPages());
    },
    
    /**
     * Returns the toolbar used for paging so you can add new buttons.
     * @return {YAHOO.ext.Toolbar}
     */
    getPageToolbar : function(){
        return this.pageToolbar;  
    },
    
    onPageLoaded : function(pageNum, totalPages){
        this.cursor = pageNum;
        this.lastPage = totalPages;
        this.afterTextEl.innerHTML = this.afterPageText.replace('%0', totalPages);
        this.field.dom.value = pageNum;
        this.first.setDisabled(pageNum == 1);
        this.prev.setDisabled(pageNum == 1);
        this.next.setDisabled(pageNum == totalPages);
        this.last.setDisabled(pageNum == totalPages);
        this.loading.enable();
    },
    
    onLoadError : function(){
        this.loading.enable();
    },
    
    onEnter : function(e){
        if(e.browserEvent.keyCode == e.RETURN){
            var v = this.field.dom.value;
            if(!v){
                this.field.dom.value = this.cursor;
                return;
            }
            var pageNum = parseInt(v, 10);
            if(isNaN(pageNum)){
                this.field.dom.value = this.cursor;
                return;
            }
            pageNum = Math.min(Math.max(1, pageNum), this.lastPage);
            this.grid.dataModel.loadPage(pageNum);
            e.stopEvent();
        }
    },
    
    beforeLoad : function(){
        this.grid.stopEditing();
        if(this.loading){
            this.loading.disable();
        }  
    },
    
    onClick : function(which){
        switch(which){
            case 'first':
                this.grid.dataModel.loadPage(1);
            break;
            case 'prev':
                this.grid.dataModel.loadPage(this.cursor -1);
            break;
            case 'next':
                this.grid.dataModel.loadPage(this.cursor + 1);
            break;
            case 'last':
                this.grid.dataModel.loadPage(this.lastPage);
            break;
            case 'refresh':
                this.grid.dataModel.loadPage(this.cursor);
            break;
        }
    },
    
    unplugDataModel : function(dm){
        dm.removeListener('beforeload', this.beforeLoad, this);
        dm.removeListener('load', this.onPageLoaded, this);
        dm.removeListener('loadexception', this.onLoadError, this);
        YAHOO.ext.grid.PagedGridView.superclass.unplugDataModel.call(this, dm);
    },
    
    plugDataModel : function(dm){
        dm.on('beforeload', this.beforeLoad, this, true);
        dm.on('load', this.onPageLoaded, this, true);
        dm.on('loadexception', this.onLoadError, this);
        YAHOO.ext.grid.PagedGridView.superclass.plugDataModel.call(this, dm);
    },
    
    /**
     * Customizable piece of the default paging text (defaults to "Page")
     * @type String
     */
    beforePageText : "Page",
    /**
     * Customizable piece of the default paging text (defaults to "of %0")
     * @type String
     */
    afterPageText : "of %0",
    /**
     * Customizable piece of the default paging text (defaults to "First Page")
     * @type String
     */
    firstText : "First Page",
    /**
     * Customizable piece of the default paging text (defaults to "Previous Page")
     * @type String
     */
    prevText : "Previous Page",
    /**
     * Customizable piece of the default paging text (defaults to "Next Page")
     * @type String
     */
    nextText : "Next Page",
    /**
     * Customizable piece of the default paging text (defaults to "Last Page")
     * @type String
     */
    lastText : "Last Page",
    /**
     * Customizable piece of the default paging text (defaults to "Refresh")
     * @type String
     */
    refreshText : "Refresh"
});