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/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * 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 net.dv8tion.jda.api.events.self;

import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.entities.SelfUser;
import net.dv8tion.jda.api.events.Event;
import net.dv8tion.jda.api.events.UpdateEvent;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * Indicates that a {@link net.dv8tion.jda.api.entities.SelfUser SelfUser} changed or started an activity.
 * 
Every SelfUserEvent is derived from this event and can be casted.
 *
 * Can be used to detect any SelfUserEvent.
 */
public abstract class GenericSelfUpdateEvent extends Event implements UpdateEvent
{
    protected final T previous;
    protected final T next;
    protected final String identifier;

    public GenericSelfUpdateEvent(
            @Nonnull JDA api, long responseNumber,
            @Nullable T previous, @Nullable T next, @Nonnull String identifier)
    {
        super(api, responseNumber);
        this.previous = previous;
        this.next = next;
        this.identifier = identifier;
    }

    /**
     * The {@link net.dv8tion.jda.api.entities.SelfUser SelfUser}
     *
     * @return The {@link net.dv8tion.jda.api.entities.SelfUser SelfUser}
     */
    @Nonnull
    public SelfUser getSelfUser()
    {
        return api.getSelfUser();
    }

    @Nonnull
    @Override
    public SelfUser getEntity()
    {
        return getSelfUser();
    }

    @Nonnull
    @Override
    public String getPropertyIdentifier()
    {
        return identifier;
    }

    @Nullable
    @Override
    public T getOldValue()
    {
        return previous;
    }

    @Nullable
    @Override
    public T getNewValue()
    {
        return next;
    }
}