/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011-2016 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.javascript.checks;

import org.sonar.api.server.rule.RulesDefinition;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.plugins.javascript.api.tree.Tree.Kind;
import org.sonar.plugins.javascript.api.tree.expression.LiteralTree;
import org.sonar.plugins.javascript.api.tree.statement.ExpressionStatementTree;
import org.sonar.plugins.javascript.api.visitors.DoubleDispatchVisitorCheck;
import org.sonar.squidbridge.annotations.ActivatedByDefault;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
import org.sonar.squidbridge.annotations.SqaleSubCharacteristic;

@Rule(
  key = "StrictMode",
  name = "\"strict\" mode should be used with caution",
  priority = Priority.INFO,
  tags = {Tags.CROSS_BROWSER, Tags.USER_EXPERIENCE})
@ActivatedByDefault
@SqaleSubCharacteristic(RulesDefinition.SubCharacteristics.ARCHITECTURE_RELIABILITY)
@SqaleConstantRemediation("5min")
public class StrictModeCheck extends DoubleDispatchVisitorCheck {

  private static final String MESSAGE = "Use of JavaScript strict mode may result in unexpected behaviour in some browsers.";

  @Override
  public void visitExpressionStatement(ExpressionStatementTree tree) {
    if (tree.expression().is(Kind.STRING_LITERAL)) {
      String value = ((LiteralTree) tree.expression()).value();

      if ("\"use strict\"".equals(value) || "'use strict'".equals(value)) {
        addLineIssue(tree, MESSAGE);
      }
    }

    super.visitExpressionStatement(tree);
  }

}
