/*
 * Ext JS Library 2.0
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * licensing@extjs.com
 *
 * http://extjs.com/license
 */
/*
 * John Wilson (Daemach) daemach@gmail.com
 * http://ideamill.synaptrixgroup.com
 *
 * MODIFIED:
 * [05.05.2008 Steve 'Cutter' Blades]
 * Added the ability to read the returned JSON, even if
 * you don't use the ColdFusion QueryConvertForGrid() function
 */
Ext.data.CFJsonReader = function(meta, recordType){
  this.meta = meta || {};
  this.recordType = recordType ? Ext.data.Record.create(recordType) : {};
};

Ext.extend(Ext.data.CFJsonReader, Ext.data.DataReader, {
  read: function(response){
		var o = this.parse(response);

    return this.readRecords(o);
  },
  
  // private function a store will implement 
  onMetaChange: function(meta, recordType, o){
  },
	
	decode: function(response){
		var json = this.parse(response);
	  var aRecords = {};
		
		//if query then parse the query
		if( json.QUERY){
			 var cList = json.QUERY.COLUMNS;
       var cData = json.QUERY.DATA;
			//convert all the columns to lowercase
	    for(var i=0, len = cList.length; i < len; i++){
	      cList[i] = cList[i].toLowerCase();
	    }
	    
	    for (var i = 0; i < cData.length; i++) {
	      var oRecord = {};
	      
	      for (var j = 0; j < cList.length; j++) {
	        var currData = cData[i][j];
	        if (currData === null) {
	          currData = '';
	        }
	        oRecord[cList[j]] = currData;
	      }
	      aRecords[i] = oRecord;
	    }
	    aRecords.recordCount = cData.length;
	    aRecords.columnList = cList;	
		}else{
			//TODO: fix this for all inner objects
			for(obj in json){
				aRecords[obj.toLowerCase()] = json[obj];
			}
		}
		
	  return aRecords;
	},
  
  readRecords: function(json){
    var aRecords = [];
    var cList = json.QUERY.COLUMNS;
    var cData = json.QUERY.DATA;
    var idField = this.meta.id;
    
    for (var i = 0; i < cData.length; i++) {
      var oRecord = {};
      
      for (var j = 0; j < cList.length; j++) {
        var currData = cData[i][j];
        if (currData === null) {
          currData = '';
        }
        oRecord[cList[j].toLowerCase()] = currData;
      }
      if (idField) {
        var id = cData[i][cList.indexOf(idField)];
        aRecords.push(new Ext.data.Record(oRecord, id));
      } else {
        aRecords.push(new Ext.data.Record(oRecord));
      }
    }
    if (!json.TOTALROWCOUNT) {
      json.TOTALROWCOUNT = aRecords.length;
    }
    return {
      success: true,
      records: aRecords,
      totalRecords: json.TOTALROWCOUNT
    };
  },
	
	parse: function(response){
		var json = response.responseText;
    if (json.indexOf('COLUMNS') > 0 && json.indexOf('"QUERY":') < 0) {
      json = '{"QUERY":' + json + '}';
    }
    var o = eval("(" + json + ")");
    if (!o) {
      throw {
        message: "CFJsonReader.read: Json object not found"
      };
    }
    if (o.metaData) {
      delete this.ef;
      this.meta = o.metaData;
      this.recordType = Ext.data.Record.create(o.metaData.fields);
      this.onMetaChange(this.meta, this.recordType, o);
    }
		return o;
	}
});