/**
 * Copyright 2017 Huawei Technologies Co., Ltd.
 *
 * 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 org.onap.vnfsdk.marketplace.common;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.Collection;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;
import java.nio.file.Files;
import java.nio.file.Paths;

/**
 * common utility class.
 */
public class ToolUtil {

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

    public static final String CATALOGUE_CSAR_DIR_NAME = "csar";

    public static final String CATALOGUE_IMAGE_DIR_NAME = "image";

    public static final String CSAR_EXTENSION = ".csar";

    public static final int FILE_PERCENT = 1024 * 1024; // 1M

    private ToolUtil() {
    }

    public static boolean isEmptyString(String val) {
        return val == null || "".equals(val);
    }

    public static boolean isTrimedEmptyString(String val) {
        return val == null || "".equals(val.trim());
    }

    public static boolean isTrimedEmptyArray(String[] val) {
        return val == null || val.length == 0;
    }

    public static boolean isEmptyCollection(Collection<?> coll) {
        return null == coll || coll.isEmpty();
    }

    /**
     * store chunk file to local temp directory.
     *
     * @param dirName directory name
     * @param fileName file name
     * @param uploadedInputStream upload input stream
     * @return String
     * @throws IOException e
     */
    public static String storeChunkFileInLocal(String dirName, String fileName, InputStream uploadedInputStream)
            throws IOException {
        File tmpDir = new File(dirName);
        LOG.info("tmpdir = " + File.separator + dirName);
        if(!tmpDir.exists()) {
            tmpDir.mkdirs();
        }
        File file = new File(tmpDir + File.separator + fileName);

        try (OutputStream os = new FileOutputStream(file, true);) {
            int read = 0;
            byte[] bytes = new byte[1024];
            while((read = uploadedInputStream.read(bytes)) != -1) {
                os.write(bytes, 0, read);
            }
            os.flush();
            return file.getAbsolutePath();
        }
    }

    /**
     * get temp dirctory when upload package.
     *
     * @param dirName temp directory name
     * @param fileName package name
     * @return String
     */
    public static String getTempDir(String dirName, String fileName) {
        return Thread.currentThread().getContextClassLoader().getResource("/").getPath() + dirName + File.separator
                + fileName.replace(CSAR_EXTENSION, "");
    }

    public static String getUnzipDir(String dirName) {
        File tmpDir = new File(File.separator + dirName);
        return tmpDir.getAbsolutePath().replace(CSAR_EXTENSION, "");
    }

    /**
     * delete file.
     *
     * @param dirName the directory of file
     * @param fileName file name
     * @return boolean
     */
    public static boolean deleteFile(String dirName, String fileName) {
        File tmpDir = new File(File.separator + dirName);
        if(!tmpDir.exists()) {
            return true;
        }
        File file = new File(tmpDir.getAbsolutePath() + File.separator + fileName);
        if(file.exists()) {
            boolean isFileDeleted=false;
            String fileAbsPath = file.getAbsolutePath();
            try {
                Files.delete(Paths.get(file.getPath()));
                isFileDeleted=true;
            } catch (IOException e) {
                LOG.error("fail to delete {} {} ", fileAbsPath, e);
            }
            return isFileDeleted;
        }
        return true;
    }

    public static String getCatalogueCsarPath() {
        return File.separator + CATALOGUE_CSAR_DIR_NAME;
    }

    public static String getCatalogueImagePath() {
        return File.separator + CATALOGUE_IMAGE_DIR_NAME;
    }

    /**
     * get file size.
     *
     * @param file file which to get the size
     * @param fileUnit file unit
     * @return String file size
     */
    public static String getFileSize(File file, int fileUnit) {
        String fileSize = "";
        DecimalFormat format = new DecimalFormat("#0.00");
        if(file.exists()) {
            fileSize = format.format((double)file.length() / fileUnit) + "M";
        }
        return fileSize;
    }

    public static String formatFileSize(double fileLength, int fileUnit) {
        DecimalFormat format = new DecimalFormat("#0.00");
        return format.format(fileLength / fileUnit) + "M";
    }

    /**
     * fix package format.
     *
     * @param csarId package ID
     * @return String
     */
    public static String formatCsar(String csarId) {
        String result = csarId;
        if(csarId.indexOf(CSAR_EXTENSION) < 0) {
            result += CSAR_EXTENSION;
        }
        return result;
    }

    /**
     * judge the file's format is yaml or not.
     *
     * @param file file to judge
     * @return boolean
     */
    public static boolean isYamlFile(File file) {
        return !file.isDirectory() && file.getName().indexOf(".yaml") != -1;
    }

    /**
     * remove the csar suffix.
     *
     * @param csarName package name
     * @return String
     */
    public static String removeCsarSuffix(String csarName) {
        return csarName.replaceAll(CSAR_EXTENSION, "");
    }

    /**
     * add the csar fuffix.
     *
     * @param csarName package name
     * @return String
     */
    public static String addCsarSuffix(String csarName) {
        if(csarName.indexOf(CSAR_EXTENSION) == -1) {
            return csarName + CSAR_EXTENSION;
        }
        return csarName;
    }

    /**
     * process file name.
     *
     * @param fileName file's name
     * @return String
     */
    public static String processFileName(String fileName) {
        int index = fileName.indexOf(".zip");
        if(index == -1) {
            return fileName;
        }

        return addCsarSuffix(fileName.replaceAll(".zip", ""));
    }

    /**
     * exchange object to string.
     *
     * @param obj object
     * @return String
     */
    public static String objectToString(Object obj) {
        if(obj == null) {
            return "";
        }
        Gson gson = new Gson();

        return gson.toJson(obj);
    }

    public static String generateId() {
        return UUID.randomUUID().toString();
    }

    /**
     * get the size format according file size.
     *
     * @param fileSize file size
     * @return size format
     */
    public static String getFormatFileSize(long fileSize) {
        long kb = 1024;
        long mb = kb * 1024;
        long gb = mb * 1024;

        if(fileSize >= gb) {
            return String.format("%.1f GB", (float)fileSize / gb);
        } else if(fileSize >= mb) {
            float fi = (float)fileSize / mb;
            return String.format(fi > 100 ? "%.0f MB" : "%.1f MB", fi);
        } else if(fileSize >= kb) {
            float fi = (float)fileSize / kb;
            return String.format(fi > 100 ? "%.0f KB" : "%.1f KB", fi);
        } else {
            return String.format("%d B", fileSize);
        }
    }

    /**
     * get gson from json.
     * 
     * @param jsonString json string
     * @param templateClass template class
     * @return Template
     */
    public static <T> T fromJson(String jsonString, Class<T> templateClass) {
        Gson gson = new Gson();
        return gson.fromJson(jsonString, templateClass);
    }

}