public with sharing class CaseHistoriesComponentController {
	
	public Id caseId {get; set;}
	public cHistories[] histories; 
	
	public List<cHistories> getHistories()
	{
		list<cHistories> histories = new list<cHistories>();
		String prevDate = '';
		for(CaseHistory cHistory : [Select CreatedDate, CreatedBy.Name, CreatedBy.Id, Field, NewValue, OldValue from CaseHistory where CaseId = :caseId order by CreatedDate desc])
		{
			if((cHistory.newValue == null && cHistory.oldValue == null) 
					|| (cHistory.newValue != null && !(string.valueOf(cHistory.newValue).startsWith('005') || string.valueOf(cHistory.newValue).startsWith('00G')))
					|| (cHistory.oldValue != null && !(string.valueOf(cHistory.oldValue).startsWith('005') || string.valueOf(cHistory.oldValue).startsWith('00G'))))
			{
				cHistories tempHistory = new cHistories();
				// Set the Date and who performed the action
				if(String.valueOf(cHistory.CreatedDate) != prevDate)
				{
					tempHistory.theDate = String.valueOf(cHistory.CreatedDate);
					tempHistory.who = cHistory.CreatedBy.Name;
					tempHistory.userId = cHistory.CreatedBy.Id;
				}
				else
				{
					tempHistory.theDate = '';
					tempHistory.who = '';
					tempHistory.userId = cHistory.CreatedBy.Id;
				}
				prevDate = String.valueOf(cHistory.CreatedDate);
				
				// Get the field label
				String fieldLabel = TeasTicketGlobalFunction.returnFieldLabel(String.valueOf(cHistory.Field));
				
				// Set the Action value
	       		if (String.valueOf(cHistory.Field) == 'created') {    // on Creation
	       			tempHistory.action = 'Created.';
	      		}
	      		else if(cHistory.OldValue != null && cHistory.NewValue == null){ // when deleting a value from a field
	      			// Format the Date and if there's an error, catch it and re
	      			try {
	         			tempHistory.action = 'Deleted ' + Date.valueOf(cHistory.OldValue).format() + ' in <b>' + fieldLabel + '</b>.';
	        		} catch (Exception e){
	         			tempHistory.action = 'Deleted ' + String.valueOf(cHistory.OldValue) + ' in <b>' + fieldLabel + '</b>.';
	        		}
	      		}
	      		else{  // all other scenarios
	      			String fromText = '';
	        		if (cHistory.OldValue != null) {
		         		try {
		          			fromText = ' from ' + Date.valueOf(cHistory.OldValue).format();
		         		} catch (Exception e) {
		          			fromText = ' from ' + String.valueOf(cHistory.OldValue);
		         		}
	        		}
	        		
	        		String toText = '';
	        		if (cHistory.OldValue != null) {
		        		try {
				         	toText = Date.valueOf(cHistory.NewValue).format();
				        } catch (Exception e) {
				         	toText = String.valueOf(cHistory.NewValue);
				        }
	        		}
	        		if(toText != '')
	        			tempHistory.action = 'Changed <b>' + fieldLabel + '</b>' + fromText + ' to <b>' + toText + '</b>.';
	        		else
	        			tempHistory.action = 'Changed <b>' + fieldLabel;
	       		}
	       		
	       		// Add to the list
	       		histories.add(tempHistory);
			}
	 	}
	 	
	 	return histories;
	}	
	
	// Inner Class to store the detail of the case histories	
	public class cHistories {

		public String theDate {get; set;}
	    public String who {get; set;}
	    public Id userId {get; set;} 
	    public String action {get; set;}
	}
}