/*
 * This file is part of Araknemu.
 *
 * Araknemu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Araknemu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Copyright (c) 2017-2020 Vincent Quatrevieux
 */

package fr.quatrevieux.araknemu.game.activity;

import fr.quatrevieux.araknemu.core.event.EventsSubscriber;
import fr.quatrevieux.araknemu.core.event.Listener;
import fr.quatrevieux.araknemu.game.GameConfiguration;
import fr.quatrevieux.araknemu.game.event.GameStopped;
import fr.quatrevieux.araknemu.util.ExecutorFactory;
import org.apache.logging.log4j.Logger;

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Handle game activity
 */
public final class ActivityService implements EventsSubscriber {
    private final Logger logger;
    private final ScheduledExecutorService executor;

    public ActivityService(GameConfiguration.ActivityConfiguration configuration, Logger logger) {
        this.logger = logger;
        this.executor = ExecutorFactory.create(configuration.threadsCount());
    }

    /**
     * Execute the task
     * If the task failed to execute, it will be retried
     */
    public void execute(Task task) {
        executor.schedule(
            () -> {
                try {
                    final long startTime = System.currentTimeMillis();
                    logger.info("Start task {}", task);
                    task.execute(logger);
                    logger.info("End task {} in {}ms", task, System.currentTimeMillis() - startTime);
                } catch (RuntimeException e) {
                    logger.error("Execution failed : " + e.getMessage() + " for task " + task, e);

                    if (task.retry(this)) {
                        logger.info("Retry execute the task {}", task);
                    } else {
                        logger.warn("Cannot retry the task {}", task);
                    }
                }
            },
            task.delay().toMillis(),
            TimeUnit.MILLISECONDS
        );
    }

    /**
     * Execute a periodic task
     * The period time is the {@link Task#delay()}
     * A failed task will not be retried
     */
    public void periodic(Task task) {
        executor.scheduleAtFixedRate(
            () -> {
                try {
                    final long startTime = System.currentTimeMillis();
                    logger.info("Start task {}", task);
                    task.execute(logger);
                    logger.info("End task {} in {}ms", task, System.currentTimeMillis() - startTime);
                } catch (RuntimeException e) {
                    logger.error("Execution failed : " + e.getMessage() + " for task " + task, e);
                }
            },
            task.delay().toMillis(),
            task.delay().toMillis(),
            TimeUnit.MILLISECONDS
        );
    }

    @Override
    public Listener[] listeners() {
        return new Listener[] {
            new Listener<GameStopped>() {
                @Override
                public void on(GameStopped event) {
                    executor.shutdownNow();
                }

                @Override
                public Class<GameStopped> event() {
                    return GameStopped.class;
                }
            },
        };
    }
}