/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.currysrc.api.process.ast;

import org.eclipse.jdt.core.dom.AbstractTypeDeclaration;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.EnumConstantDeclaration;
import org.eclipse.jdt.core.dom.EnumDeclaration;

import java.util.List;

/**
 * Locates the {@link org.eclipse.jdt.core.dom.BodyDeclaration} associated with an enum
 * declaration.
 */
public final class EnumConstantLocator implements BodyDeclarationLocator {

  static final String LOCATOR_TYPE_NAME = "enumConstant";

  private final TypeLocator typeLocator;

  private final String constantName;

  public EnumConstantLocator(String packageName, String typeName, String constantName) {
    this(new TypeLocator(packageName, typeName), constantName);
  }

  public EnumConstantLocator(TypeLocator typeLocator, String constantName) {
    this.typeLocator = typeLocator;
    this.constantName = constantName;
  }

  @Override public TypeLocator getTypeLocator() {
    return typeLocator;
  }

  @Override
  public boolean matches(BodyDeclaration node) {
    if (!(node instanceof EnumConstantDeclaration)) {
      return false;
    }

    if (typeLocator.matches((BodyDeclaration) node.getParent())) {
      EnumConstantDeclaration enumConstantDeclaration = (EnumConstantDeclaration) node;
      if (enumConstantDeclaration.getName().getFullyQualifiedName().equals(constantName)) {
        return true;
      }
    }
    return false;
  }

  @Override
  public BodyDeclaration find(CompilationUnit cu) {
    AbstractTypeDeclaration typeDeclaration = typeLocator.find(cu);
    if (typeDeclaration == null || !(typeDeclaration instanceof EnumDeclaration)) {
      return null;
    }
    for (EnumConstantDeclaration enumConstantDeclaration
        : (List<EnumConstantDeclaration>) ((EnumDeclaration) typeDeclaration).enumConstants()) {
      if (enumConstantDeclaration.getName().getFullyQualifiedName().equals(constantName)) {
        return enumConstantDeclaration;
      }
    }
    return null;
  }

  @Override public String getStringFormType() {
    return LOCATOR_TYPE_NAME;
  }

  @Override public String getStringFormTarget() {
    return typeLocator.getStringFormTarget() + "#" + constantName;
  }

  @Override
  public String toString() {
    return "EnumConstantLocator{" +
        "typeLocator=" + typeLocator +
        ", constantName='" + constantName + '\'' +
        '}';
  }
}