/*
 * Copyright 2013 MovingBlocks
 *
 * 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 org.terasology.entitySystem.prefab.internal;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import org.terasology.assets.AssetType;
import org.terasology.assets.ResourceUrn;
import org.terasology.entitySystem.Component;
import org.terasology.entitySystem.prefab.Prefab;
import org.terasology.entitySystem.prefab.PrefabData;

import java.util.List;
import java.util.Map;

/**
 */
public class PojoPrefab extends Prefab {

    private Prefab parent;
    private Map<Class<? extends Component>, Component> componentMap;
    private List<Prefab> children = Lists.newArrayList();
    private boolean persisted;
    private boolean alwaysRelevant = true;

    public PojoPrefab(ResourceUrn urn, AssetType<?, PrefabData> assetType, PrefabData data) {
        super(urn, assetType);
        reload(data);
    }

    @Override
    public Prefab getParent() {
        return parent;
    }

    @Override
    public List<Prefab> getChildren() {
        return ImmutableList.copyOf(children);
    }

    @Override
    public boolean isPersisted() {
        return persisted;
    }

    @Override
    public boolean isAlwaysRelevant() {
        return alwaysRelevant;
    }

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

    @Override
    public boolean hasComponent(Class<? extends Component> component) {
        return componentMap.containsKey(component);
    }

    @Override
    public <T extends Component> T getComponent(Class<T> componentClass) {
        return componentClass.cast(componentMap.get(componentClass));
    }

    @Override
    public Iterable<Component> iterateComponents() {
        return ImmutableList.copyOf(componentMap.values());
    }

    @Override
    protected void doReload(PrefabData data) {
        this.componentMap = ImmutableMap.copyOf(data.getComponents());
        this.persisted = data.isPersisted();
        this.alwaysRelevant = data.isAlwaysRelevant();
        this.parent = data.getParent();
        if (parent != null && parent instanceof PojoPrefab) {
            ((PojoPrefab) parent).children.add(this);
        }
    }

}