/**
 * @class YAHOO.ext.grid.DefaultColumnModel
 * @extends YAHOO.ext.grid.AbstractColumnModel
 * This is the default implementation of a ColumnModel used by the Grid. It defines
 * the columns in the grid.
 * <br>Usage:<br>
 <pre><code>
 var sort = YAHOO.ext.grid.DefaultColumnModel.sortTypes;
 var myColumns = [
	{header: "Ticker", width: 60, sortable: true, sortType: sort.asUCString}, 
	{header: "Company Name", width: 150, sortable: true, sortType: sort.asUCString}, 
	{header: "Market Cap.", width: 100, sortable: true, sortType: sort.asFloat}, 
	{header: "$ Sales", width: 100, sortable: true, sortType: sort.asFloat, renderer: money}, 
	{header: "Employees", width: 100, sortable: true, sortType: sort.asFloat}
 ];
 var colModel = new YAHOO.ext.grid.DefaultColumnModel(myColumns);
 </code></pre>
 * @constructor
 * @param {Object} config The config object
*/
YAHOO.ext.grid.DefaultColumnModel = function(config){
	YAHOO.ext.grid.DefaultColumnModel.superclass.constructor.call(this);
    /**
     * The config passed into the constructor
     */
    this.config = config;
    
    /**
     * The width of columns which have no width specified (defaults to 100)
     * @type Number
     */
    this.defaultWidth = 100;
    /**
     * Default sortable of columns which have no sortable specified (defaults to false)
     * @type Boolean
     */
    this.defaultSortable = false;
};
YAHOO.extendX(YAHOO.ext.grid.DefaultColumnModel, YAHOO.ext.grid.AbstractColumnModel, {
    
    /**
     * Returns the number of columns.
     * @return {Number}
     */
    getColumnCount : function(){
        return this.config.length;
    },
        
    /**
     * Returns true if the specified column is sortable.
     * @param {Number} col The column index
     * @return {Boolean}
     */
    isSortable : function(col){
        if(typeof this.config[col].sortable == 'undefined'){
            return this.defaultSortable;
        }
        return this.config[col].sortable;
    },
        
    /**
     * Returns the sorting comparison function defined for the column (defaults to sortTypes.none).
     * @param {Number} col The column index
     * @return {Function}
     */
    getSortType : function(col){
        if(!this.dataMap){
            // build a lookup so we don't search every time
            var map = [];
            for(var i = 0, len = this.config.length; i < len; i++){
                map[this.getDataIndex(i)] = i;
            }
            this.dataMap = map;
        }
        col = this.dataMap[col];
        if(!this.config[col].sortType){
            return YAHOO.ext.grid.DefaultColumnModel.sortTypes.none;
        }
        return this.config[col].sortType;
    },
        
    /**
     * Sets the sorting comparison function for a column.
     * @param {Number} col The column index
     * @param {Function} fn
     */
    setSortType : function(col, fn){
        this.config[col].sortType = fn;
    },
        
    
    /**
     * Returns the rendering (formatting) function defined for the column.
     * @param {Number} col The column index
     * @return {Function}
     */
    getRenderer : function(col){
        if(!this.config[col].renderer){
            return YAHOO.ext.grid.DefaultColumnModel.defaultRenderer;
        }
        return this.config[col].renderer;
    },
        
    /**
     * Sets the rendering (formatting) function for a column.
     * @param {Number} col The column index
     * @param {Function} fn
     */
    setRenderer : function(col, fn){
        this.config[col].renderer = fn;
    },
        
    /**
     * Returns the width for the specified column.
     * @param {Number} col The column index
     * @return {Number}
     */
    getColumnWidth : function(col){
        return this.config[col].width || this.defaultWidth;
    },
        
    /**
     * Sets the width for a column.
     * @param {Number} col The column index
     * @param {Number} width The new width
     */
    setColumnWidth : function(col, width, suppressEvent){
        this.config[col].width = width;
        this.totalWidth = null;
        if(!suppressEvent){
             this.onWidthChange.fireDirect(this, col, width);
        }
    },
        
    /**
     * Returns the total width of all columns.
     * @param {Boolean} includeHidden True to include hidden column widths
     * @return {Number}
     */
    getTotalWidth : function(includeHidden){
        if(!this.totalWidth){
            this.totalWidth = 0;
            for(var i = 0; i < this.config.length; i++){
                if(includeHidden || !this.isHidden(i)){
                    this.totalWidth += this.getColumnWidth(i);
                }
            }
        }
        return this.totalWidth;
    },
        
    /**
     * Returns the header for the specified column.
     * @param {Number} col The column index
     * @return {String}
     */
    getColumnHeader : function(col){
        return this.config[col].header;
    },
         
    /**
     * Sets the header for a column.
     * @param {Number} col The column index
     * @param {String} header The new header
     */
    setColumnHeader : function(col, header){
        this.config[col].header = header;
        this.onHeaderChange.fireDirect(this, col, header);
    },
    
    /**
     * Returns the tooltip for the specified column.
     * @param {Number} col The column index
     * @return {String}
     */
    getColumnTooltip : function(col){
            return this.config[col].tooltip;
    },
    /**
     * Sets the tooltip for a column.
     * @param {Number} col The column index
     * @param {String} tooltip The new tooltip
     */
    setColumnTooltip : function(col, header){
            this.config[col].tooltip = tooltip;
    },
        
    /**
     * Returns the dataIndex for the specified column.
     * @param {Number} col The column index
     * @return {Number}
     */
    getDataIndex : function(col){
        if(typeof this.config[col].dataIndex != 'number'){
            return col;
        }
        return this.config[col].dataIndex;
    },
         
    /**
     * Sets the dataIndex for a column.
     * @param {Number} col The column index
     * @param {Number} dataIndex The new dataIndex
     */
    setDataIndex : function(col, dataIndex){
        this.config[col].dataIndex = dataIndex;
    },
    /**
     * Returns true if the cell is editable.
     * @param {Number} colIndex The column index
     * @param {Number} rowIndex The row index
     * @return {Boolean}
     */
    isCellEditable : function(colIndex, rowIndex){
        return this.config[colIndex].editable || (typeof this.config[colIndex].editable == 'undefined' && this.config[colIndex].editor);
    },
    
    /**
     * Returns the editor defined for the cell/column.
     * @param {Number} colIndex The column index
     * @param {Number} rowIndex The row index
     * @return {Object}
     */
    getCellEditor : function(colIndex, rowIndex){
        return this.config[colIndex].editor;
    },
       
    /**
     * Sets if a column is editable.
     * @param {Number} col The column index
     * @param {Boolean} editable True if the column is editable
     */
    setEditable : function(col, editable){
        this.config[col].editable = editable;
    },
    
    
    /**
     * Returns true if the column is hidden.
     * @param {Number} colIndex The column index
     * @return {Boolean}
     */
    isHidden : function(colIndex){
        return this.config[colIndex].hidden;
    },
    
    
    /**
     * Returns true if the column width cannot be changed
     */
    isFixed : function(colIndex){
        return this.config[colIndex].fixed;
    },
    
    /**
     * Returns true if the column cannot be resized
     * @return {Boolean}
     */
    isResizable : function(colIndex){
        return this.config[colIndex].resizable !== false;
    },
    /**
     * Sets if a column is hidden.
     * @param {Number} colIndex The column index
     */
    setHidden : function(colIndex, hidden){
        this.config[colIndex].hidden = hidden;
        this.totalWidth = null;
        this.fireHiddenChange(colIndex, hidden);
    },
    
    /**
     * Sets the editor for a column.
     * @param {Number} col The column index
     * @param {Object} editor The editor object
     */
    setEditor : function(col, editor){
        this.config[col].editor = editor;
    }
});

/**
 * Defines the default sorting (casting?) comparison functions used when sorting data:
 * <br>&nbsp;&nbsp;sortTypes.none - sorts data as it is without casting or parsing (the default)
 * <br>&nbsp;&nbsp;sortTypes.asUCString - case insensitive string
 * <br>&nbsp;&nbsp;sortTypes.asDate - attempts to parse data as a date
 * <br>&nbsp;&nbsp;sortTypes.asFloat
 * <br>&nbsp;&nbsp;sortTypes.asInt
 * @static
 */
YAHOO.ext.grid.DefaultColumnModel.sortTypes = {
    none : function(s) {
    	return s;
    },

    asUCString : function(s) {
    	return String(s).toUpperCase();
    },
    
    asDate : function(s) {
        if(s instanceof Date){
            return s.getTime();
        }
    	return Date.parse(String(s));
    },
    
    asFloat : function(s) {
    	var val = parseFloat(String(s).replace(/,/g, ''));
        if(isNaN(val)) val = 0;
    	return val;
    },
    
    asInt : function(s) {
        var val = parseInt(String(s).replace(/,/g, ''));
        if(isNaN(val)) val = 0;
    	return val;
    }
};

YAHOO.ext.grid.DefaultColumnModel.defaultRenderer = function(value){
	if(typeof value == 'string' && value.length < 1){
	    return '&#160;';
	}
	return value;
}