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/*
 * 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 org.sonar.api.server.rule.RulesDefinition;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.java.ast.visitors.PublicApiChecker;
import org.sonar.java.tag.Tag;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.Tree.Kind;
import org.sonar.squidbridge.annotations.ActivatedByDefault;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
import org.sonar.squidbridge.annotations.SqaleSubCharacteristic;

import java.util.Deque;
import java.util.LinkedList;

@Rule(
  key = "MissingDeprecatedCheck",
  name = "Deprecated elements should have both the annotation and the Javadoc tag",
  priority = Priority.MAJOR,
  tags = {Tag.BAD_PRACTICE, Tag.OBSOLETE})
@ActivatedByDefault
@SqaleSubCharacteristic(RulesDefinition.SubCharacteristics.UNDERSTANDABILITY)
@SqaleConstantRemediation("5min")
public class MissingDeprecatedCheck extends AbstractDeprecatedChecker {

  private static final Kind[] CLASS_KINDS = PublicApiChecker.classKinds();
  private static final Kind[] METHOD_KINDS = PublicApiChecker.methodKinds();

  private final Deque currentParent = new LinkedList<>();
  private final Deque classOrInterfaceIsDeprecated = new LinkedList<>();

  @Override
  public void visitNode(Tree tree) {
    boolean isLocalVar = false;
    if (tree.is(Tree.Kind.VARIABLE)) {
      isLocalVar = currentParent.peek().is(METHOD_KINDS);
    } else {
      currentParent.push(tree);
    }

    boolean hasDeprecatedAnnotation = hasDeprecatedAnnotation(tree);
    boolean hasJavadocDeprecatedTag = hasJavadocDeprecatedTag(tree);
    if (currentClassNotDeprecated() && !isLocalVar) {
      if (hasDeprecatedAnnotation && !hasJavadocDeprecatedTag) {
        reportIssue(getReportTree(tree), "Add the missing @deprecated Javadoc tag.");
      } else if (hasJavadocDeprecatedTag && !hasDeprecatedAnnotation) {
        reportIssue(getReportTree(tree), "Add the missing @Deprecated annotation.");
      }
    }
    if (tree.is(CLASS_KINDS)) {
      classOrInterfaceIsDeprecated.push(hasDeprecatedAnnotation || hasJavadocDeprecatedTag);
    }
  }

  private boolean currentClassNotDeprecated() {
    return classOrInterfaceIsDeprecated.isEmpty() || !classOrInterfaceIsDeprecated.peek();
  }

  @Override
  public void leaveNode(Tree tree) {
    if (!tree.is(Tree.Kind.VARIABLE)) {
      currentParent.pop();
    }
    if (tree.is(CLASS_KINDS)) {
      classOrInterfaceIsDeprecated.pop();
    }
  }

}