/*
 * 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.checks;

import com.google.common.collect.ImmutableList;
import org.sonar.check.Rule;
import org.sonar.java.model.ModifiersUtils;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.semantic.Symbol;
import org.sonar.plugins.java.api.tree.ClassTree;
import org.sonar.plugins.java.api.tree.IdentifierTree;
import org.sonar.plugins.java.api.tree.Modifier;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.Tree.Kind;
import org.sonar.plugins.java.api.tree.VariableTree;

import java.util.List;

@Rule(key = "S1258")
public class AtLeastOneConstructorCheck extends IssuableSubscriptionVisitor {

  @Override
  public List<Kind> nodesToVisit() {
    return ImmutableList.of(Kind.CLASS, Kind.ENUM);
  }

  @Override
  public void visitNode(Tree tree) {
    if(!hasSemantic()) {
      return;
    }
    checkClassTree((ClassTree) tree);
  }

  private void checkClassTree(ClassTree tree) {
    IdentifierTree simpleName = tree.simpleName();
    if (simpleName != null && !ModifiersUtils.hasModifier(tree.modifiers(), Modifier.ABSTRACT)) {
      boolean hasPrivateMember = false;
      for (Tree member : tree.members()) {
        if (member.is(Kind.CONSTRUCTOR)) {
          return;
        } else if (member.is(Kind.VARIABLE)) {
          VariableTree variable = (VariableTree) member;
          Symbol symbol = variable.symbol();
          hasPrivateMember |= variable.initializer() == null && symbol.isPrivate() && !symbol.isStatic();
        }
      }
      if (hasPrivateMember) {
        reportIssue(simpleName, "Add a constructor to the " + tree.declarationKeyword().text() + ".");
      }
    }
  }

}