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/*
 * Copyright (C) 2016 Original Authors
 *
 * 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 io.fabric8.docker.client.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Utils {

  public static boolean isNullOrEmpty(String str) {
    return str == null || str.isEmpty();
  }

  public static boolean isNotNullOrEmpty(String str) {
    return !isNullOrEmpty(str);
  }

  public static String getSystemPropertyOrEnvVar(String systemPropertyName, String envVarName, String defaultValue) {
    String answer = System.getProperty(systemPropertyName);
    if (isNotNullOrEmpty(answer)) {
      return answer;
    }

    answer = System.getenv(envVarName);
    if (isNotNullOrEmpty(answer)) {
      return answer;
    }

    return defaultValue;
  }

  public static String convertSystemPropertyNameToEnvVar(String systemPropertyName) {
    return systemPropertyName.toUpperCase().replaceAll("[.-]", "_");
  }

  public static String getEnvVar(String envVarName, String defaultValue) {
    String answer = System.getenv(envVarName);
    return isNotNullOrEmpty(answer) ? answer : defaultValue;
  }

  public static String getSystemPropertyOrEnvVar(String systemPropertyName, String defaultValue) {
    return getSystemPropertyOrEnvVar(systemPropertyName, convertSystemPropertyNameToEnvVar(systemPropertyName), defaultValue);
  }

  public static String getSystemPropertyOrEnvVar(String systemPropertyName) {
    return getSystemPropertyOrEnvVar(systemPropertyName, (String) null);
  }

  public static Boolean getSystemPropertyOrEnvVar(String systemPropertyName, Boolean defaultValue) {
    String result = getSystemPropertyOrEnvVar(systemPropertyName, defaultValue.toString());
    return result.equals("1") || Boolean.parseBoolean(result);
  }

  public static int getSystemPropertyOrEnvVar(String systemPropertyName, int defaultValue) {
    String result = getSystemPropertyOrEnvVar(systemPropertyName, new Integer(defaultValue).toString());
    return Integer.parseInt(result);
  }

  public static String join(final Object[] array) {
    return join(array, ',');
  }

  public static String join(final Object[] array, final char separator) {
    if (array == null) {
      return null;
    }
    if (array.length == 0) {
      return "";
    }
    final StringBuilder buf = new StringBuilder();
    for (int i = 0; i < array.length; i++) {
      if (i > 0) {
        buf.append(separator);
      }
      if (array[i] != null) {
        buf.append(array[i]);
      }
    }
    return buf.toString();
  }


  public static String readFully(InputStream is) throws IOException {
    StringBuilder sb = new StringBuilder();
    try (BufferedReader br = new BufferedReader(new InputStreamReader(is))) {
      String read;

      while ((read = br.readLine()) != null) {
        sb.append(read);
      }

    }
    return sb.toString();
  }
}