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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.internal.utils.concurrent.task;

import net.dv8tion.jda.api.exceptions.ContextException;
import net.dv8tion.jda.api.utils.concurrent.Task;
import net.dv8tion.jda.internal.requests.WebSocketClient;
import net.dv8tion.jda.internal.utils.Checks;
import net.dv8tion.jda.internal.utils.JDALogger;
import org.slf4j.Logger;

import javax.annotation.Nonnull;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.LongConsumer;

public class GatewayTask implements Task
{
    private static final Logger log = JDALogger.getLog(Task.class);
    private final Runnable onCancel;
    private final CompletableFuture future;
    private LongConsumer setTimeout;

    public GatewayTask(CompletableFuture future, Runnable onCancel)
    {
        this.future = future;
        this.onCancel = onCancel;
    }

    public GatewayTask onSetTimeout(LongConsumer setTimeout)
    {
        this.setTimeout = setTimeout;
        return this;
    }

    @Override
    public boolean isStarted()
    {
        return true;
    }

    @Nonnull
    @Override
    public Task onError(@Nonnull Consumer callback)
    {
        Checks.notNull(callback, "Callback");
        Consumer failureHandler = ContextException.here((error) -> log.error("Task Failure callback threw error", error));
        future.exceptionally(error -> {
            try
            {
                callback.accept(error);
            }
            catch (Throwable e)
            {
                failureHandler.accept(e);
                if (e instanceof Error)
                    throw e;
            }
            return null;
        });
        return this;
    }

    @Nonnull
    @Override
    public Task onSuccess(@Nonnull Consumer callback)
    {
        Checks.notNull(callback, "Callback");
        Consumer failureHandler = ContextException.here((error) -> log.error("Task Success callback threw error", error));
        future.thenAccept(result -> {
            try
            {
                callback.accept(result);
            }
            catch (Throwable error)
            {
                failureHandler.accept(error);
                if (error instanceof Error)
                    throw error;
            }
        });
        return this;
    }

    @Nonnull
    @Override
    public Task setTimeout(@Nonnull Duration timeout)
    {
        Checks.notNull(timeout, "Timeout");
        long millis = timeout.toMillis();
        Checks.positive(millis, "Timeout");
        if (this.setTimeout != null)
            this.setTimeout.accept(millis);
        return this;
    }

    @Nonnull
    @Override
    public T get()
    {
        if (WebSocketClient.WS_THREAD.get())
            throw new UnsupportedOperationException("Blocking operations are not permitted on the gateway thread");
        return future.join();
    }

    @Override
    public void cancel()
    {
        onCancel.run();
    }
}