/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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 org.apache.edgent.console.server;

import java.io.IOException;
import java.io.File;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.List;

public class ServerUtil {

	/**
	 *  The public constructor of this utility class for use by the HttpServer class.
	 */
    public ServerUtil() {

    }
    /**
     * Returns the path to the jar file for this package
     * @return a String representing the path to the jar file of this package
     */
    private String getPath() {
        return getClass().getProtectionDomain().getCodeSource().getLocation().getPath();
    }

    /**
     * Returns a file object representing the parent's parent directory of the jar file.
     * @return a File object
     */
    private File getTopDirFilePath() {
        String topDirProp = System.getProperty("edgent.test.top.dir.file.path");
        if (topDirProp != null) {
          return new File(topDirProp);
        }
        File jarFile = new File(getPath());
        return jarFile.getParentFile().getParentFile().getParentFile();
    }

    /**
     * Returns the File object representing the "webapps" directory
     * @return a File object or null if the "webapps" directory is not found
     */
    private File getWarFilePath() {
        List<File> foundFiles = new ArrayList<>();
        try {
            Files.walkFileTree(getTopDirFilePath().toPath(), new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                    if (dir.endsWith("webapps")) {
                      foundFiles.add(dir.toFile());
                    }
                    return FileVisitResult.CONTINUE;
                }
            });
        } catch (IOException e) {
          // end of file searching
        }
        if (foundFiles.size() != 0) {
            return foundFiles.get(0);
        }
        return null;
    }
    
    /**
     * Looks for the absolute file path of the name of the warFileName argument
     * @param warFileName the name of the war file to find the absolute path to
     * @return the absolute path to the warFileName argument as a String
     */
    public String getAbsoluteWarFilePath(String warFileName) {
        File warFilePath = getWarFilePath();
        if (warFilePath != null) {
        	File warFile = new File(warFilePath.getAbsolutePath() + "/" + warFileName);
        	if (warFile.exists()) {        	
        		return warFile.getAbsolutePath();
        	} else {
        		return "";
        	}
        }
        else {
            return "";
        }
    }
    
    /**
     * Looks for the absolute file path of the name of the warFileName argument when running from Eclipse
     * @param pDomain the ProtectionDomain to use to get the source's location
     * @param warFileName the name of the war file to find the absolute path to
     * @return the absolute path to the warFileName argument as a String
     */
    public String getEclipseWarFilePath(ProtectionDomain pDomain, String warFileName) {
        URL location = pDomain.getCodeSource().getLocation();
        File topEdgent = new File(location.getPath()).getParentFile().getParentFile();
        File warFile = new File(topEdgent, "./target/java8/console/webapps/" +warFileName);
        if (warFile.exists()) {
        	return warFile.getAbsolutePath();
        } else {
        	return "";
        }
	
    }

}