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/*
 * 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 io.trino.execution.scheduler;

import com.google.common.collect.ImmutableSet;
import com.google.common.util.concurrent.ListenableFuture;
import io.trino.execution.RemoteTask;

import java.util.Optional;
import java.util.Set;

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static java.util.Objects.requireNonNull;

public class ScheduleResult
{
    public enum BlockedReason
    {
        WRITER_SCALING,
        SPLIT_QUEUES_FULL,
        WAITING_FOR_SOURCE,
        /**/;
    }

    private final Set newTasks;
    private final ListenableFuture blocked;
    private final Optional blockedReason;
    private final boolean finished;
    private final int splitsScheduled;

    public ScheduleResult(boolean finished, Iterable newTasks, int splitsScheduled)
    {
        this(finished, newTasks, immediateVoidFuture(), Optional.empty(), splitsScheduled);
    }

    public ScheduleResult(boolean finished, Iterable newTasks, ListenableFuture blocked, BlockedReason blockedReason, int splitsScheduled)
    {
        this(finished, newTasks, blocked, Optional.of(requireNonNull(blockedReason, "blockedReason is null")), splitsScheduled);
    }

    private ScheduleResult(boolean finished, Iterable newTasks, ListenableFuture blocked, Optional blockedReason, int splitsScheduled)
    {
        this.finished = finished;
        this.newTasks = ImmutableSet.copyOf(requireNonNull(newTasks, "newTasks is null"));
        this.blocked = requireNonNull(blocked, "blocked is null");
        this.blockedReason = requireNonNull(blockedReason, "blockedReason is null");
        this.splitsScheduled = splitsScheduled;
    }

    public boolean isFinished()
    {
        return finished;
    }

    public Set getNewTasks()
    {
        return newTasks;
    }

    public ListenableFuture getBlocked()
    {
        return blocked;
    }

    public int getSplitsScheduled()
    {
        return splitsScheduled;
    }

    public Optional getBlockedReason()
    {
        return blockedReason;
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("finished", finished)
                .add("newTasks", newTasks.size())
                .add("blocked", !blocked.isDone())
                .add("splitsScheduled", splitsScheduled)
                .add("blockedReason", blockedReason)
                .toString();
    }
}