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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.model.expression;

import com.google.common.collect.Iterators;
import org.sonar.java.model.AbstractTypedTree;
import org.sonar.java.model.InternalSyntaxToken;
import org.sonar.java.model.declaration.ClassTreeImpl;
import org.sonar.plugins.java.api.semantic.Symbol;
import org.sonar.plugins.java.api.tree.Arguments;
import org.sonar.plugins.java.api.tree.ClassTree;
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.NewClassTree;
import org.sonar.plugins.java.api.tree.ParameterizedTypeTree;
import org.sonar.plugins.java.api.tree.SyntaxToken;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.TreeVisitor;
import org.sonar.plugins.java.api.tree.TypeArguments;
import org.sonar.plugins.java.api.tree.TypeTree;

import javax.annotation.Nullable;

import java.util.Iterator;

public class NewClassTreeImpl extends AbstractTypedTree implements NewClassTree {

  @Nullable
  private ExpressionTree enclosingExpression;
  @Nullable
  private SyntaxToken dotToken;
  @Nullable
  private SyntaxToken newKeyword;
  @Nullable
  private TypeArguments typeArguments;
  private TypeTree identifier;
  private final Arguments arguments;
  @Nullable
  private final ClassTree classBody;

  public NewClassTreeImpl(Arguments arguments, @Nullable ClassTreeImpl classBody) {
    super(Kind.NEW_CLASS);
    this.enclosingExpression = null;
    this.arguments = arguments;
    this.classBody = classBody;
  }

  public NewClassTreeImpl completeWithIdentifier(TypeTree identifier) {
    this.identifier = identifier;
    return this;
  }

  public NewClassTreeImpl completeWithEnclosingExpression(ExpressionTree enclosingExpression) {
    this.enclosingExpression = enclosingExpression;
    return this;
  }

  public NewClassTreeImpl completeWithNewKeyword(SyntaxToken newKeyword) {
    this.newKeyword = newKeyword;
    return this;
  }

  public NewClassTreeImpl completeWithTypeArguments(TypeArgumentListTreeImpl typeArguments) {
    this.typeArguments = typeArguments;
    return this;
  }

  @Override
  public Kind kind() {
    return Kind.NEW_CLASS;
  }

  @Nullable
  @Override
  public ExpressionTree enclosingExpression() {
    return enclosingExpression;
  }

  @Nullable
  @Override
  public TypeArguments typeArguments() {
    return typeArguments;
  }

  @Override
  public TypeTree identifier() {
    return identifier;
  }

  @Override
  public Arguments arguments() {
    return arguments;
  }

  @Nullable
  @Override
  public ClassTree classBody() {
    return classBody;
  }

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

  @Override
  public Iterator childrenIterator() {
    Iterator result = Iterators.emptyIterator();
    result = addIfNotNull(result, enclosingExpression, dotToken, newKeyword, typeArguments);
    result = add(result, identifier, arguments);
    result = addIfNotNull(result, classBody);
    return result;
  }

  private static Iterator add(Iterator iterator, Tree... trees) {
    return Iterators.concat(iterator, Iterators.forArray(trees));
  }

  public IdentifierTree getConstructorIdentifier() {
    return getConstructorIdentifier(identifier());
  }

  private IdentifierTree getConstructorIdentifier(Tree constructorSelect) {
    IdentifierTree constructorIdentifier;
    if (constructorSelect.is(Tree.Kind.MEMBER_SELECT)) {
      MemberSelectExpressionTree mset = (MemberSelectExpressionTree) constructorSelect;
      constructorIdentifier = mset.identifier();
    } else if (constructorSelect.is(Tree.Kind.IDENTIFIER)) {
      constructorIdentifier = (IdentifierTree) constructorSelect;
    } else if (constructorSelect.is(Tree.Kind.PARAMETERIZED_TYPE)) {
      constructorIdentifier = getConstructorIdentifier(((ParameterizedTypeTree) constructorSelect).type());
    } else {
      throw new IllegalStateException("Constructor select is not of the expected type " + constructorSelect);
    }
    return constructorIdentifier;
  }
  @Nullable
  @Override
  public SyntaxToken newKeyword() {
    return newKeyword;
  }

  public void completeWithDotToken(InternalSyntaxToken dotToken) {
    this.dotToken = dotToken;
  }

  @Nullable
  @Override
  public SyntaxToken dotToken() {
    return dotToken;
  }

  @Override
  public Symbol constructorSymbol() {
    return this.getConstructorIdentifier().symbol();
  }

  private static Iterator addIfNotNull(Iterator iterator, Tree... trees) {
    Iterator result = iterator;
    for (Tree tree : trees) {
      if (tree != null) {
        result = Iterators.concat(result, Iterators.singletonIterator(tree));
      }
    }
    return result;
  }
}