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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.code;

import java.util.Objects;

import br.com.objectos.core.lang.Preconditions;
import br.com.objectos.way.testable.Equality;
import br.com.objectos.way.testable.Testable;
import br.com.objectos.way.testable.Tester;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class AnnotationValueInfo implements Testable {

  private static final Tester TESTER = Tester.of(AnnotationValueInfo.class)
      .add("name", AnnotationValueInfo::name)
      .add("kind", AnnotationValueInfo::kind)
      .add("value", AnnotationValueInfo::value)
      .build();

  abstract String name();
  abstract AnnotationValueKind kind();
  public abstract Object value();

  AnnotationValueInfo() {
  }

  public boolean booleanValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_BOOLEAN.equals(kind()));
    return ((Boolean) value()).booleanValue();
  }

  public char charValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_CHAR.equals(kind()));
    return ((Character) value()).charValue();
  }

  public double doubleValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_DOUBLE.equals(kind()));
    return ((Double) value()).doubleValue();
  }

  public EnumConstantInfo enumConstantInfoValue() {
    Preconditions.checkArgument(AnnotationValueKind.ENUM.equals(kind()));
    return (EnumConstantInfo) value();
  }

  public > E enumValue(Class enumType) {
    return enumConstantInfoValue().getEnumValue(enumType);
  }

  public float floatValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_FLOAT.equals(kind()));
    return ((Float) value()).floatValue();
  }

  public int intValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_INT.equals(kind()));
    return ((Integer) value()).intValue();
  }

  @Override
  public Equality isEqualTo(Object that) {
    return TESTER.test(this, that);
  }

  public long longValue() {
    Preconditions.checkArgument(AnnotationValueKind.PRIMITIVE_LONG.equals(kind()));
    return ((Long) value()).longValue();
  }

  public SimpleTypeInfo simpleTypeInfoValue() {
    Preconditions.checkArgument(AnnotationValueKind.TYPE.equals(kind()));
    return (SimpleTypeInfo) value();
  }

  public String stringValue() {
    Preconditions.checkArgument(AnnotationValueKind.STRING.equals(kind()));
    return (String) value();
  }

  @Override
  public String toString() {
    return name() + "=" + value();
  }

  @Override
  public final int hashCode() {
    return Objects.hash(name(), kind(), value());
  }

  @Override
  public final boolean equals(final Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj instanceof AnnotationValueInfo) {
      final AnnotationValueInfo that = (AnnotationValueInfo) obj;
      return name().equals(that.name())
          && kind().equals(that.kind())
          && value().equals(that.value());
    } else {
      return false;
    }
  }

}