import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.ProcessingInstruction;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

import ca.uhn.hl7v2.HL7Exception;


public class HL7V2ValidationReport  {


	/**
	 * Takes a list of notifications sent by validator and format the result
	 * 
	 * @param notifications
	 * @param isAborted : did the validation comes to its end or not
	 * @param isFailed TODO
	 * @param objectType : the type of object being validating
	 * @param isXmlWellFormed 
	 * @param isValidCDA
	 * @param isValidEpsos
	 * @return
	 * @throws Exception 
	 */
	public static String formatValidationResult(List<HL7Exception> errorList,List<HL7Exception> warningList, boolean isAborted, boolean isFailed) throws Exception
	{
		// root
		Element root = new Element("SummaryResults");
		// document
		Document result = new Document(root);

		Element overview = new Element("ValidationResultsOverview");

		Calendar cal = Calendar.getInstance();
		// validation date
		Element date = new Element("ValidationDate");
		final String DATE_FORMAT_DAY = "yyyy, MM dd";
		SimpleDateFormat sdfDate = new SimpleDateFormat(DATE_FORMAT_DAY, Locale.ENGLISH);
		date.addContent(sdfDate.format(cal.getTime()));
		overview.addContent(date);

		// validation time
		Element time = new Element("ValidationTime");
		final String DATE_FORMAT_TIME = "hh:mm (aa)";
		SimpleDateFormat sdfTime = new SimpleDateFormat(DATE_FORMAT_TIME, Locale.ENGLISH);
		time.addContent(sdfTime.format(cal.getTime()));
		overview.addContent(time);

		// validation service version
		Element serviceVersion = new Element("ValidationServiceVersion");

		//*****************************A CHANGER************************* 
		//serviceVersion.addContent(VersionConstants.EAR_VERSION);
		serviceVersion.addContent("1.4");


		overview.addContent(serviceVersion);

		// validation service name
		Element serviceName = new Element("ValidationServiceName");
		serviceName.addContent("HL7V2.x EVS");
		overview.addContent(serviceName);


		// counters for each type of notification
		Integer errorCount = 0;
		Integer warningCount = 0;
//		Integer noteCount = 0;
//		Integer unknownCount = 0;
//		Integer reportCount = 0;
		//Integer checkCount = 0;

		Element resultStatus = new Element("ValidationTestResult");
		Element validationResult = new Element("ValidationResults");
		Element resultXML = new Element("ResultXML");
		
		
							
		

		if ((errorList == null || errorList.isEmpty()) && (warningList == null || warningList.isEmpty()))
		{
			if (isAborted)
				resultStatus.addContent("ABORTED");
			if (isFailed)
				resultStatus.addContent("FAILED");
			else
				resultStatus.addContent("PASSED");
		}	
		else
		{
			if (errorList != null && !errorList.isEmpty())
			{
				for (HL7Exception error : errorList)
				{
					errorCount ++;
					Element xmlNotification = new Element("Error");
	
					Element location = new Element("Location");
					location.addContent(error.getSegmentName() + "-" + error.getFieldPosition());
					xmlNotification.addContent(location);
					Element description = new Element("Description");
					description.addContent(error.getMessage());
					xmlNotification.addContent(description);
					resultXML.addContent(xmlNotification);
				}
			}
			
			if (warningList != null && !warningList.isEmpty())
			{
				for (HL7Exception warning : warningList)
				{
					warningCount ++;
					Element xmlNotification = new Element("Warning");
	
					Element location = new Element("Location");
					location.addContent(warning.getSegmentName() + "-" + warning.getFieldPosition());
					xmlNotification.addContent(location);
					Element description = new Element("Description");
					description.addContent(warning.getMessage());
					xmlNotification.addContent(description);
					resultXML.addContent(xmlNotification);
				}			
			}
			
			
			validationResult.addContent(resultXML);

			if (isAborted)
				resultStatus.addContent("ABORTED");
			else if (isFailed)
				resultStatus.addContent("FAILED");
			else if (errorCount > 0)
				resultStatus.addContent("FAILED");
			else
				resultStatus.addContent("PASSED");

			//checkCount = errorList.size();

		}




		overview.addContent(resultStatus);
		root.addContent(overview);


		// counters
		Element validationCounters = new Element("ValidationCounters");

		/*
		Element checks = new Element("NrOfChecks");
		checks.addContent(Integer.toString(checkCount));
		validationCounters.addContent(checks);
		*/

		Element errors = new Element("NrOfValidationErrors");
		errors.addContent(Integer.toString(errorCount));
		validationCounters.addContent(errors);

		
		Element warnings = new Element("NrOfValidationWarnings");
		warnings.addContent(Integer.toString(warningCount));
		validationCounters.addContent(warnings);
		
		/*
		Element notes = new Element("NrOfValidationNotes");
		notes.addContent(Integer.toString(noteCount));
		validationCounters.addContent(notes);

		Element reports = new Element("NrOfValidationReports");
		reports.addContent(Integer.toString(reportCount));
		validationCounters.addContent(reports);

		Element unknowns = new Element("NrOfValidationUnknown");
		unknowns.addContent(Integer.toString(unknownCount));
		validationCounters.addContent(unknowns);
		*/

		root.addContent(validationCounters);
		root.addContent(validationResult);

		// add a line to declare the location of the stylesheet to use
		//<?xml-stylesheet type="text/xsl" href="stylesheet.xsl"?>
		HashMap<String, String> parameters = new HashMap<String, String>();
		parameters.put("type", "text/xsl");
		parameters.put("href", "XSLT_LOCATION");
		ProcessingInstruction pi = new ProcessingInstruction("xml-stylesheet", parameters);
		result.getContent().add(0, pi);

		Format format = Format.getPrettyFormat();
		return new XMLOutputter(format).outputString(result);
	}



}