/*
 * This file is part of LanternServer, licensed under the MIT License (MIT).
 *
 * Copyright (c) LanternPowered <https://www.lanternpowered.org>
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the Software), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.lanternpowered.server.behavior.pipeline.impl;

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

import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import org.lanternpowered.server.behavior.Behavior;
import org.lanternpowered.server.behavior.pipeline.BehaviorPipeline;
import org.lanternpowered.server.behavior.pipeline.SubBehaviorPipeline;
import org.spongepowered.api.util.GuavaCollectors;

import java.util.List;

public class BehaviorPipelineImpl<B extends Behavior> implements BehaviorPipeline<B> {

    final Class<B> behaviorType;
    final List<B> behaviors;

    final LoadingCache<Class<?>, SubBehaviorPipeline<?>> pipelineCache = Caffeine.newBuilder().build(this::load);

    SubBehaviorPipeline<?> load(Class<?> type) {
        //noinspection unchecked
        return new SubBehaviorPipelineImpl((Class) this.behaviorType, (List) this.behaviors.stream()
                .filter(type::isInstance).collect(GuavaCollectors.toImmutableList()), this);
    }

    public BehaviorPipelineImpl(Class<B> behaviorType, List<B> behaviors) {
        this.behaviorType = behaviorType;
        this.behaviors = behaviors;
    }

    @Override
    public List<B> getBehaviors() {
        return this.behaviors;
    }

    @Override
    public <S extends B> SubBehaviorPipeline<S> pipeline(Class<S> behaviorType) {
        checkNotNull(behaviorType, "behaviorType");
        //noinspection unchecked
        return (SubBehaviorPipeline<S>) this.pipelineCache.get(behaviorType);
    }
}