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/**
 * Configurate
 * Copyright (C) zml and Configurate 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 ninja.leaping.configurate;


import com.google.common.collect.ImmutableList;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

class ListConfigValue extends ConfigValue {
    final AtomicReference> values = new AtomicReference<>();

    ListConfigValue(SimpleConfigurationNode holder) {
        super(holder);
        values.set(new ArrayList());
    }

    ListConfigValue(SimpleConfigurationNode holder, Object startValue) {
        super(holder);
        this.values.set(new ArrayList());
        SimpleConfigurationNode child = holder.createNode(0);
        child.attached = true;
        child.setValue(startValue);
        this.values.get().add(child);
    }

    @Override
    public Object getValue() {
        final List values = this.values.get();
        synchronized (values) {
            final List ret = new ArrayList<>(values.size());
            for (SimpleConfigurationNode obj : values) {
                ret.add(obj.getValue());
            }
            return ret.isEmpty() ? null : ret;
        }
    }

    @Override
    public void setValue(Object value) {
        if (!(value instanceof Collection)) {
            value = Collections.singleton(value);
        }
        final Collection valueList = (Collection) value;
        final List newValue = new ArrayList<>(valueList.size());
        int count = 0;
        for (Object o : valueList) {
            SimpleConfigurationNode child = holder.createNode(count);
            newValue.add(count, child);
            child.attached = true;
            child.setValue(o);
            ++count;
        }
        detachNodes(values.getAndSet(newValue));

    }

    @Override
    public SimpleConfigurationNode putChild(Object key, SimpleConfigurationNode value) {
        return putChild(key, value, false);
    }

    @Override
    SimpleConfigurationNode putChildIfAbsent(Object key, SimpleConfigurationNode value) {
        return putChild(key, value, true);
    }

    private SimpleConfigurationNode putChild(Object key, SimpleConfigurationNode value, boolean onlyIfAbsent) {
        SimpleConfigurationNode ret = null;
        List values;
        do {
            values = this.values.get();
            synchronized (values) {
                final int index = (Integer) key;
                if (value == null) {
                    if (index < values.size()) {
                        ret = values.remove(index);
                        for (int i = index; i < values.size(); ++i) {
                            values.get(i).key = index;
                        }
                    }
                } else {
                    if (index >= 0 && index < values.size()) {
                        if (onlyIfAbsent) {
                            return values.get(index);
                        } else {
                            ret = values.set(index, value);
                        }
                    } else if (index == -1) { // Gotta correct the child path for the correct path name
                        values.add(value);
                        value.key = values.lastIndexOf(value);
                    } else {
                        values.add(index, value);
                    }
                }
            }
        } while (!this.values.compareAndSet(values, values));
        return ret;
    }


    @Override
    public SimpleConfigurationNode getChild(Object key) {
        final List values = this.values.get();
        synchronized (values) {
            Integer value = Types.asInt(key);
            if (value == null || value < 0 || value >= values.size()) {
                return null;
            }
            return values.get(value);
        }
    }

    @Override
    public Iterable iterateChildren() {
        List values = this.values.get();
        synchronized (values) {
            return ImmutableList.copyOf(values);
        }
    }

    private void detachNodes(List children) {
        synchronized (children) {
            for (SimpleConfigurationNode node : children) {
                node.attached = false;
                node.clear();
            }
        }
    }

    @Override
    public void clear() {
        List oldValues = values.getAndSet(new ArrayList());
        detachNodes(oldValues);
    }
}
    

    

    

            

    

            



    
    






    
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