/**
@ Name            SFApexUtilFunctions
@ Author          Aslam Bari
@ Created Date    31 March, 2011
@ Description     A utility methods class for helping developers community
*/
public class SFApexUtilFunctions{
    
    /**
    @ Name            join
    @ Author          Aslam Bari
    @ Created Date    31 March, 2011
    @ Desctiption     Join one list of String to a full string
    @ Param           List<String>: list of string data
    @ Param           separator: the string by which the list is joined
    */
    public static string join(List<String> lstArg, String separator){
        String fullString = '';
        for(String item: lstArg){
            fullString += item + separator;
        }
        if(fullString.length() > 0)
            fullString = fullString.substring(0, fullString.length() - 1);
        
        return fullString;
    }
    
    /**
    @ Name            getUrlContents
    @ Author          Aslam Bari
    @ Created Date    31 March, 2011
    @ Desctiption     Fetch the contents of remote url
    @ Param           url: remote url with all parameters attached to url for GET call
    */
    public static string getUrlContents(String url){
        HttpRequest request = new HttpRequest();
        request.setEndPoint(url);
        request.setMethod('GET');
        Http call = new Http();
        HttpResponse response = call.send(request);
        return response.getBody();
    }
    
     /**
     @ Name            makeCondition
     @ Author          Akhielsh Soni
     @ Created Date    31 March, 2011
     @ Desctiption     Used to create condition part for dynamic query generation
     @ Param           name of field on which the condition is to be applied
     @ Param           type of field for determining the way of condition generation
     @ Param           value to be searched
     @ Caution         when passing date or date time values to be searched in range then that will be concatenated with ~ symbol ie. startdate~enddate and these
                       must be in dd/MM/yyyy format
     */

    public static String makeCondition(String fieldName,String fieldType,String value){
      String criteria ='';
      if(value != null && value != ''){
        if(fieldType=='STRING'){
          criteria = fieldName + ' like \'%' + value + '%\'';
        }
        else if(fieldType=='BOOLEAN'){
          if(value!='All'){
            criteria = fieldName + '=' + boolean.valueOf(value);
          }
        }
        else if(fieldType=='DATE'){
          List<String> dateRange = value.split('~');
          if(dateRange.size()>0){
            List<String> lstFirstDate ;
            List<String> lstSecondDate ;         
            //making sure to date ranage is present in list if user have not passed
            if(dateRange.size()==1){
              dateRange.add('');
            }
            //when from date range is given
            if(dateRange[0] != null && dateRange[0] != ''){
              lstFirstDate = dateRange[0].split('/');
              criteria = fieldName + '>=' + lstFirstDate[2] + '-' +lstFirstDate[0] + '-' +lstFirstDate[1];
              //when to date range is given
              if(dateRange[1] != null && dateRange[1] != ''){
                lstSecondDate = dateRange[1].split('/');
                criteria += ' AND ' + fieldName + '<=' + lstSecondDate[2] + '-' +lstSecondDate[0] + '-' +lstSecondDate[1];
              }
            }
            //when from date range is not given handle on to date range
            else{
              if(dateRange[1] != null && dateRange[1] != ''){
                lstSecondDate = dateRange[1].split('/');
                criteria = fieldName + '<=' + lstSecondDate[2] + '-' +lstSecondDate[0] + '-' +lstSecondDate[1];
              }
            }
          }
        }
        else if(fieldType=='DATETIME'){
          List<String> dateRange = value.split('~');
          if(dateRange.size()>0){
            List<String> lstFirstDate ;
            List<String> lstSecondDate ;
            //making sure to date ranage is present in list if user have not passed
            if(dateRange.size()==1){
              dateRange.add('');
            }
            //when from date range is given
            if(dateRange[0] != null && dateRange[0] != ''){
              lstFirstDate = dateRange[0].split('/');
              criteria = fieldName + '>=' + lstFirstDate[2] + '-' +lstFirstDate[0] + '-' +lstFirstDate[1] + 'T00:00:00Z';
              //when to date range is given
              if(dateRange[1] != null && dateRange[1] != ''){
                lstSecondDate = dateRange[1].split('/');
                criteria += ' AND ' + fieldName + '<=' + lstSecondDate[2] + '-' +lstSecondDate[0] + '-' +lstSecondDate[1] + 'T00:00:00Z';
              }
            }
            //when from date range is not given handle on to date range
            else{
             if(dateRange[1] != null && dateRange[1] != ''){
                lstSecondDate = dateRange[1].split('/');
                criteria = fieldName + '<=' + lstSecondDate[2] + '-' +lstSecondDate[0] + '-' +lstSecondDate[1] + 'T00:00:00Z';
              }
            }
          }
        }
      }
      return criteria;  
    }
}