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/*
 * Sonar Delphi Plugin
 * Copyright (C) 2019 Integrated Application Development
 *
 * 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 au.com.integradev.delphi.antlr.ast.node;

import au.com.integradev.delphi.antlr.ast.visitors.DelphiParserVisitor;
import javax.annotation.Nullable;
import org.antlr.runtime.Token;
import org.sonar.plugins.communitydelphi.api.ast.CommonDelphiNode;
import org.sonar.plugins.communitydelphi.api.ast.DelphiNode;
import org.sonar.plugins.communitydelphi.api.ast.ExpressionNode;
import org.sonar.plugins.communitydelphi.api.ast.IfStatementNode;
import org.sonar.plugins.communitydelphi.api.ast.StatementNode;
import org.sonar.plugins.communitydelphi.api.token.DelphiTokenType;

public final class IfStatementNodeImpl extends DelphiNodeImpl implements IfStatementNode {
  public IfStatementNodeImpl(Token token) {
    super(token);
  }

  @Override
  public  T accept(DelphiParserVisitor visitor, T data) {
    return visitor.visit(this, data);
  }

  @Override
  public ExpressionNode getGuardExpression() {
    return (ExpressionNode) getChild(0);
  }

  private CommonDelphiNode getElseToken() {
    return (CommonDelphiNode) getFirstChildWithTokenType(DelphiTokenType.ELSE);
  }

  @Override
  public boolean hasElseBranch() {
    return getElseToken() != null;
  }

  @Override
  @Nullable
  public StatementNode getThenStatement() {
    DelphiNode node = getChild(2);
    if (node instanceof StatementNode) {
      return (StatementNode) node;
    }
    return null;
  }

  @Override
  @Nullable
  public StatementNode getElseStatement() {
    if (hasElseBranch()) {
      return (StatementNode) getChild(getElseToken().getChildIndex() + 1);
    }
    return null;
  }
}