/*
 * SonarQube Java
 * Copyright (C) 2012-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.java.model;

import org.sonar.api.utils.log.Logger;
import org.sonar.api.utils.log.Loggers;
import org.sonar.plugins.java.api.JavaVersion;

import javax.annotation.Nullable;

public class JavaVersionImpl implements JavaVersion {

  private static final Logger LOG = Loggers.get(JavaVersionImpl.class);

  private static final int JAVA_7 = 7;
  private static final int JAVA_8 = 8;
  private final int javaVersion;

  public JavaVersionImpl() {
    this.javaVersion = -1;
  }

  public JavaVersionImpl(int javaVersion) {
    this.javaVersion = javaVersion;
  }

  public static JavaVersion fromString(@Nullable String javaVersion) {
    if (javaVersion != null) {
      try {
        return new JavaVersionImpl(Integer.parseInt(javaVersion.replaceAll("1.", "")));
      } catch (NumberFormatException e) {
        LOG.warn("Invalid java version (got \"" + javaVersion + "\"). "
          + "The version will be ignored. Accepted formats are \"1.X\", or simply \"X\" "
          + "(for instance: \"1.5\" or \"5\", \"1.6\" or \"6\", \"1.7\" or \"7\", etc.)");
      }
    }
    return new JavaVersionImpl();
  }

  @Override
  public boolean isJava7Compatible() {
    return notSetOrAtLeast(JAVA_7);
  }

  @Override
  public boolean isJava8Compatible() {
    return notSetOrAtLeast(JAVA_8);
  }

  private boolean notSetOrAtLeast(int requiredJavaVersion) {
    return isNotSet() || requiredJavaVersion <= javaVersion;
  }

  @Override
  public String java7CompatibilityMessage() {
    return compatibilityMessage(JAVA_7);
  }

  @Override
  public String java8CompatibilityMessage() {
    return compatibilityMessage(JAVA_8);
  }

  private String compatibilityMessage(int expected) {
    return isNotSet() ? (" (sonar.java.source not set. Assuming " + expected + " or greater.)") : "";
  }

  @Override
  public int asInt() {
    return javaVersion;
  }

  @Override
  public boolean isNotSet() {
    return javaVersion == -1;
  }

  @Override
  public String toString() {
    return isNotSet() ? "none" : Integer.toString(javaVersion);
  }
}