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package no.digipost.api.interceptors;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.ws.WebServiceMessage;
import org.springframework.ws.soap.SoapMessage;
import org.springframework.xml.transform.TransformerObjectSupport;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamResult;
import java.io.StringWriter;

public class SoapLog extends TransformerObjectSupport {

    private static final Logger LOG = LoggerFactory.getLogger("PAYLOAD_FILE");

    private final LogLevel logLevel;

    public SoapLog(final LogLevel logLevel) {
        this.logLevel = logLevel;
    }

    public LogLevel getLogLevel() {
        return logLevel;
    }

    public boolean isTraceEnabled() {
        return LOG.isTraceEnabled();
    }

    public void logMessageSource(final String logMessage, final Source source) {
        try {
            if (source != null) {
                Transformer transformer = createNonIndentingTransformer();
                StringWriter writer = new StringWriter();
                transformer.transform(source, new StreamResult(writer));
                String message = logMessage + writer.toString();
                logMessage(message);
            }
        } catch (TransformerException e) {
            LOG.warn("Error logging message source", e);
        }
    }

    public Source getSource(final WebServiceMessage message) {
        if (message instanceof SoapMessage) {
            SoapMessage soapMessage = (SoapMessage) message;
            return soapMessage.getEnvelope().getSource();
        } else {
            return null;
        }
    }

    private void logMessage(final String message) {
        LOG.info(message);
    }

    private Transformer createNonIndentingTransformer() throws TransformerConfigurationException {
        Transformer transformer = createTransformer();
        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        transformer.setOutputProperty(OutputKeys.INDENT, "no");
        return transformer;
    }

    public enum LogLevel {
        NONE,
        FAULTS_ONLY,
        ALL
    }

}