/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.jclouds.glesys.domain;

import static com.google.common.base.Preconditions.checkNotNull;

import java.beans.ConstructorProperties;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.base.MoreObjects.ToStringHelper;

/**
 * Detailed information on an Email Account
 *
 * @see <a href="https://customer.glesys.com/api.php?a=doc#email_list" />
 */
public class EmailAlias {

   public static Builder<?> builder() {
      return new ConcreteBuilder();
   }

   public Builder<?> toBuilder() {
      return new ConcreteBuilder().fromEmailAlias(this);
   }

   public abstract static class Builder<T extends Builder<T>> {
      protected abstract T self();

      protected String alias;
      protected String forwardTo;

      /**
       * @see org.jclouds.glesys.domain.EmailAlias#getAlias()
       */
      public T alias(String alias) {
         this.alias = checkNotNull(alias, "alias");
         return self();
      }

      /**
       * @see EmailAlias#getForwardTo()
       */
      public T forwardTo(String forwardTo) {
         this.forwardTo = checkNotNull(forwardTo, "forwardTo");
         return self();
      }

      public EmailAlias build() {
         return new EmailAlias(alias, forwardTo);
      }

      public T fromEmailAlias(EmailAlias in) {
         return this.alias(in.getAlias()).forwardTo(in.getForwardTo());
      }
   }

   private static class ConcreteBuilder extends Builder<ConcreteBuilder> {
      @Override
      protected ConcreteBuilder self() {
         return this;
      }
   }

   private final String alias;
   private final String forwardTo;

   @ConstructorProperties({
         "emailalias", "goto"
   })
   protected EmailAlias(String alias, String forwardTo) {
      this.alias = checkNotNull(alias, "alias");
      this.forwardTo = checkNotNull(forwardTo, "forwardTo");
   }

   /**
    * @return the e-mail address being forwarded
    */
   public String getAlias() {
      return this.alias;
   }

   /**
    * @return the e-mail address this address forwards to
    */
   public String getForwardTo() {
      return this.forwardTo;
   }

   @Override
   public int hashCode() {
      return Objects.hashCode(alias);
   }

   @Override
   public boolean equals(Object obj) {
      if (this == obj) return true;
      if (obj == null || getClass() != obj.getClass()) return false;
      EmailAlias that = EmailAlias.class.cast(obj);
      return Objects.equal(this.alias, that.alias);
   }

   protected ToStringHelper string() {
      return MoreObjects.toStringHelper("")
            .add("alias", alias).add("forwardTo", forwardTo);
   }

   @Override
   public String toString() {
      return string().toString();
   }

}