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/*
 * SonarQube Python Plugin
 * Copyright (C) 2011-2019 SonarSource SA
 * mailto:info 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.python.tree;

import java.util.Objects;
import org.sonar.python.api.tree.Token;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.CheckForNull;
import org.sonar.python.api.tree.ElseStatement;
import org.sonar.python.api.tree.Expression;
import org.sonar.python.api.tree.IfStatement;
import org.sonar.python.api.tree.StatementList;
import org.sonar.python.api.tree.TreeVisitor;
import org.sonar.python.api.tree.Tree;

public class IfStatementImpl extends PyTree implements IfStatement {

  private final Token keyword;
  private final Expression condition;
  private final StatementList statements;
  private final List elifBranches;
  private final boolean isElif;
  @CheckForNull
  private final ElseStatement elseStatement;

  /**
   *
   * If statement constructor
   */
  public IfStatementImpl(Token ifKeyword, Expression condition,
                         StatementList statements, List elifBranches, @CheckForNull ElseStatement elseStatement) {
    super(ifKeyword, statements.lastToken());
    this.keyword = ifKeyword;
    this.condition = condition;
    this.statements = statements;
    this.elifBranches = elifBranches;
    this.isElif = false;
    this.elseStatement = elseStatement;
  }

  /**
   * Elif statement constructor
   */
  public IfStatementImpl(Token elifKeyword, Expression condition, StatementList statements) {
    super(elifKeyword, statements.lastToken());
    this.keyword = elifKeyword;
    this.condition = condition;
    this.statements = statements;
    this.elifBranches = Collections.emptyList();
    this.isElif = true;
    this.elseStatement = null;
  }

  @Override
  public Token keyword() {
    return keyword;
  }

  @Override
  public Expression condition() {
    return condition;
  }

  @Override
  public StatementList body() {
    return statements;
  }

  @Override
  public List elifBranches() {
    return elifBranches;
  }

  @Override
  public boolean isElif() {
    return isElif;
  }

  @CheckForNull
  @Override
  public ElseStatement elseBranch() {
    return elseStatement;
  }

  @Override
  public Kind getKind() {
    return Tree.Kind.IF_STMT;
  }

  @Override
  public void accept(TreeVisitor visitor) {
    visitor.visitIfStatement(this);
  }

  @Override
  public List children() {
    return Stream.of(Arrays.asList(keyword, condition, statements), elifBranches, Collections.singletonList(elseStatement))
      .flatMap(List::stream).filter(Objects::nonNull).collect(Collectors.toList());
  }
}