/*
   Copyright 2013 Nationale-Nederlanden

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
package nl.nn.adapterframework.validation;

import nl.nn.adapterframework.util.LogUtil;
import nl.nn.adapterframework.util.XmlBuilder;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import java.io.PrintWriter;
import java.io.StringWriter;

public class XmlValidatorErrorHandler implements ErrorHandler {
	private Logger log = LogUtil.getLogger(this);
	private boolean errorOccured = false;
	private String reasons;
	private final XmlValidatorContentHandler xmlValidatorContentHandler;
	private XmlBuilder xmlReasons = new XmlBuilder("reasons");


	public XmlValidatorErrorHandler(
			XmlValidatorContentHandler xmlValidatorContentHandler,
			String mainMessage) {
		this.xmlValidatorContentHandler = xmlValidatorContentHandler;
		XmlBuilder message = new XmlBuilder("message");;
		message.setValue(mainMessage);
		xmlReasons.addSubElement(message);
		reasons = mainMessage + ":";
	}

	protected void addReason(String message, String xpath, String location) {
		if (xpath == null) {
			xpath = xmlValidatorContentHandler.getXpath();
		}

		XmlBuilder reason = new XmlBuilder("reason");
		XmlBuilder detail;

		detail = new XmlBuilder("xpath");
		detail.setValue(xpath);
		reason.addSubElement(detail);

		detail = new XmlBuilder("location");
		detail.setValue(location);
		reason.addSubElement(detail);

		detail = new XmlBuilder("message");
		detail.setValue(message);
		reason.addSubElement(detail);

		xmlReasons.addSubElement(reason);

		if (StringUtils.isNotEmpty(location)) {
			message = location + ": " + message;
		}
		message = xpath + ": " + message;

		errorOccured = true;

		if (reasons == null) {
			reasons = message;
		} else {
			reasons = reasons + "\n" + message;
		}
	}

	protected void addReason(Throwable t) {
		String location = null;
		if (t instanceof SAXParseException) {
			SAXParseException spe = (SAXParseException)t;
			location = "at ("+spe.getLineNumber()+ ","+spe.getColumnNumber()+")";
		}
        String message;
        if (t instanceof SAXException) {
			message = t.getMessage();
		} else {
			StringWriter stringWriter = new StringWriter();
			PrintWriter printWriter = new PrintWriter(stringWriter);
			t.printStackTrace(printWriter);
			printWriter.close();
			message = stringWriter.toString();
		}
		addReason(message, null, location);
	}

	public void warning(SAXParseException exception) {
		addReason(exception);
	}
    public void error(SAXParseException exception) {
    	addReason(exception);
    }
    public void fatalError(SAXParseException exception) {
		addReason(exception);
    }

    public boolean hasErrorOccured() {
        return errorOccured;
    }

     public String getReasons() {
        return reasons;
    }

	public String getXmlReasons() {
	   return xmlReasons.toXML();
   }
}