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/*
 * SonarQube Java
 * Copyright (C) 2012 SonarSource
 * [email protected]
 *
 * 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  02
 */
package org.sonar.java.checks;

import com.google.common.collect.ImmutableList;
import org.sonar.api.server.rule.RulesDefinition;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.java.tag.Tag;
import org.sonar.plugins.java.api.tree.ExpressionTree;
import org.sonar.plugins.java.api.tree.IdentifierTree;
import org.sonar.plugins.java.api.tree.MemberSelectExpressionTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.squidbridge.annotations.ActivatedByDefault;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
import org.sonar.squidbridge.annotations.SqaleSubCharacteristic;

import java.util.List;

@Rule(
  key = "S2209",
  name = "\"static\" members should be accessed statically",
  priority = Priority.MAJOR,
  tags = {Tag.PITFALL})
@ActivatedByDefault
@SqaleSubCharacteristic(RulesDefinition.SubCharacteristics.INSTRUCTION_RELIABILITY)
@SqaleConstantRemediation("5min")
public class StaticMembersAccessCheck extends SubscriptionBaseVisitor {

  @Override
  public List nodesToVisit() {
    return ImmutableList.of(
      Tree.Kind.MEMBER_SELECT);
  }

  @Override
  public void visitNode(Tree tree) {
    MemberSelectExpressionTree memberSelect = (MemberSelectExpressionTree) tree;
    if (memberSelect.identifier().symbol().isStatic()) {
      ExpressionTree memberSelectExpression = memberSelect.expression();
      if (memberSelectExpression.is(Tree.Kind.MEMBER_SELECT)) {
        memberSelectExpression = ((MemberSelectExpressionTree) memberSelectExpression).identifier();
      }
      if (!memberSelectExpression.is(Tree.Kind.IDENTIFIER) || ((IdentifierTree) memberSelectExpression).symbol().isVariableSymbol()) {
        context.addIssue(tree, this, "Change this instance-reference to a static reference.");
      }
    }
  }

}