/*******************************************************************************
 * ============LICENSE_START========================================================================
 * ONAP : ccsdk feature sdnr wt
 * =================================================================================================
 * Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
 * =================================================================================================
 * 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.
 * ============LICENSE_END==========================================================================
 ******************************************************************************/
package org.onap.ccsdk.features.sdnr.wt.common;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Resources {

    private static final Logger LOG = LoggerFactory.getLogger(Resources.class);

    private static URL getFileURL(Class<?> cls,String resFile) {
        Bundle b = FrameworkUtil.getBundle(cls);
        URL u = null;
        LOG.debug("try to get file {}", resFile);
        if (b == null) {
            LOG.info("Load resource as file: {}", resFile);
            u = getUrlForRessource(cls,resFile);
        } else {
            LOG.info("Load resource from bundle: {}", resFile);
            u = b.getEntry(resFile);
        }
        return u;
    }

    private static String readFile(final URL u) throws IOException {
        return readFile(u.openStream());
    }

    private static String readFile(final InputStream s) throws IOException {
        // read file
        final String LR = "\n";
        BufferedReader in = new BufferedReader(new InputStreamReader(s));
        StringBuilder sb = new StringBuilder();
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            sb.append(inputLine+LR);
        }
        in.close();
        s.close();
        return sb.toString();
    }

    public static String getFileContent( Class<?> cls, String resFile) {
         LOG.debug("loading file {} from res", resFile);
         URL u = getFileURL(cls,resFile);
         String s=null;
         if (u == null) {
             LOG.warn("cannot find resfile: {}", resFile);
             return null;
         }
         try {
             s=readFile(u);
         } catch (Exception e) {
             LOG.warn("problem reading file: {}", e.getMessage());
         }
         return s;

    }

    public static URL getUrlForRessource(Class<?> cls,String fileOrDirectory) {
        //ClassLoader loader = Thread.currentThread().getContextClassLoader();
        ClassLoader loader = cls.getClassLoader();
        URL url = loader.getResource(fileOrDirectory);
        if(url==null && fileOrDirectory.startsWith("/")) {
            url = loader.getResource(fileOrDirectory.substring(1));
        }
        return url;
    }
}