/*
 * Copyright 2013 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.errorprone.refaster;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.util.ASTHelpers;

import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.TreeVisitor;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;

import java.util.List;

import javax.annotation.Nullable;

/**
 * {@link UTree} version of {@link MethodInvocationTree}.
 *
 * @author [email protected] (Louis Wasserman)
 */
@AutoValue
public abstract class UMethodInvocation extends UExpression implements MethodInvocationTree {
  public static UMethodInvocation create(UExpression methodSelect, List<UExpression> arguments) {
    return new AutoValue_UMethodInvocation(methodSelect, arguments);
  }

  public static UMethodInvocation create(UExpression methodSelect, UExpression... arguments) {
    return create(methodSelect, ImmutableList.copyOf(arguments));
  }

  @Override
  public abstract UExpression getMethodSelect();

  @Override
  public abstract List<UExpression> getArguments();

  @Override
  @Nullable
  public Unifier visitMethodInvocation(
      MethodInvocationTree methodInvocation, @Nullable Unifier unifier) {
    unifier = getMethodSelect().unify(methodInvocation.getMethodSelect(), unifier);
    return Unifier.unifyList(
        unifier, getArguments(), methodInvocation.getArguments(), allowVarargs());
  }

  @Override
  public <R, D> R accept(TreeVisitor<R, D> visitor, D data) {
    return visitor.visitMethodInvocation(this, data);
  }

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

  @Override
  public List<UTree<?>> getTypeArguments() {
    return ImmutableList.of();
  }

  @Override
  public JCMethodInvocation inline(Inliner inliner) throws CouldNotResolveImportException {
    return inliner.maker().Apply(
        com.sun.tools.javac.util.List.<JCExpression>nil(),
        getMethodSelect().inline(inliner),
        inliner.<JCExpression, UExpression>inlineList(getArguments()));
  }

  private boolean allowVarargs() {
    Symbol symbol = ASTHelpers.getSymbol(this);
    if (symbol == null || !(symbol instanceof MethodSymbol)) {
      return false;
    }
    MethodSymbol methodSymbol = (MethodSymbol) symbol;

    return methodSymbol.isVarArgs();
  }
}