package de.intevation.flys.artifacts.services;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.log4j.Logger;

import org.apache.commons.codec.binary.Base64;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import de.intevation.artifacts.common.ArtifactNamespaceContext;
import de.intevation.artifacts.common.utils.XMLUtils;
import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
import de.intevation.artifacts.common.utils.FileTools;

import de.intevation.artifacts.CallMeta;
import de.intevation.artifacts.GlobalContext;

import de.intevation.flys.utils.FLYSUtils;

/**
 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
 */
public class FileUploadService extends FLYSService {

    /** The logger used in this service.*/
    private static Logger logger = Logger.getLogger(FileUploadService.class);

    /** XPath that points to the artifact uuid.*/
    public static final String XPATH_ARTIFACT_UUID =
        "/upload/artifact-uuid/text()";

    /** XPath that points to the base64 encoded data.*/
    public static final String XPATH_DATA = "/upload/data/text()";

    public FileUploadService() {
    }


    @Override
    protected Document doProcess(
        Document data,
        GlobalContext context,
        CallMeta callMeta
    ) {
        logger.debug("FileUploadService.process");

        String uuid = extractUuid(data);

        byte[] fileData = extractData(data);
        if (fileData != null) {
            try {
                String shapePath = FLYSUtils.getXPathString(
                    FLYSUtils.XPATH_SHAPEFILE_DIR);

                File artifactDir = FileTools.getDirectory(shapePath, uuid);
                FileOutputStream fos =
                    new FileOutputStream(
                    new File(artifactDir, "user-rgd.zip"));
                try {
                    fos.write(fileData);
                }
                finally {
                    fos.close();
                }
            }
            catch (IOException ioe) {
                logger.warn(ioe, ioe);
            }
        }
        else {
            logger.debug("No data in uploaded xml.");
        }

        Document doc = XMLUtils.newDocument();
        ElementCreator ec = new ElementCreator(doc, null, null);
        Element resp = ec.create("response");
        doc.appendChild(resp);

        return doc;
    }


    protected String extractUuid(Document data) {
        return XMLUtils.xpathString(
            data, XPATH_ARTIFACT_UUID, ArtifactNamespaceContext.INSTANCE);
    }


    protected byte[] extractData(Document data) {
        String b64Data = XMLUtils.xpathString(
            data, XPATH_DATA, ArtifactNamespaceContext.INSTANCE);

        if (b64Data != null && b64Data != "") {
           byte[] fileData = Base64.decodeBase64(b64Data);
           return fileData;
        }
        return null;
    }
}