/*
 * Copyright 2016 Open Networking Laboratory
 *
 * 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.onosproject.store.primitives;

import com.google.common.base.Throwables;
import org.onosproject.store.service.ConsistentMapException;
import org.onosproject.store.service.AsyncConsistentTreeMap;
import org.onosproject.store.service.MapEventListener;
import org.onosproject.store.service.Synchronous;
import org.onosproject.store.service.ConsistentTreeMap;
import org.onosproject.store.service.Versioned;

import java.util.Collection;
import java.util.Map;
import java.util.NavigableSet;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;

/**
 * Implementation of the {@link ConsistentTreeMap} interface.
 */
public class DefaultConsistentTreeMap<K, V> extends Synchronous<AsyncConsistentTreeMap<K, V>>
        implements ConsistentTreeMap<K, V> {
    private static final int MAX_DELAY_BETWEEN_RETRY_MILLIS = 50;
    private final AsyncConsistentTreeMap<K, V> treeMap;
    private final long operationTimeoutMillis;
    private Map<K, V> javaMap;

    public DefaultConsistentTreeMap(AsyncConsistentTreeMap<K, V> treeMap, long operationTimeoutMillis) {
        super(treeMap);
        this.treeMap = treeMap;
        this.operationTimeoutMillis = operationTimeoutMillis;
    }

    private <T> T complete(CompletableFuture<T> future) {
        try {
            return future.get(operationTimeoutMillis, TimeUnit.MILLISECONDS);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw new ConsistentMapException.Interrupted();
        } catch (ExecutionException e) {
            throw new ConsistentMapException.Timeout();
        } catch (TimeoutException e) {
            Throwables.propagateIfPossible(e.getCause());
            throw new ConsistentMapException(e.getCause());
        }
    }

    @Override
    public K firstKey() {
        return complete(treeMap.firstKey());
    }

    @Override
    public K lastKey() {
        return complete(treeMap.lastKey());
    }

    @Override
    public Map.Entry<K, Versioned<V>> ceilingEntry(K key) {
        return complete(treeMap.ceilingEntry(key));
    }

    @Override
    public Map.Entry<K, Versioned<V>> floorEntry(K key) {
        return complete(treeMap.floorEntry(key));
    }

    @Override
    public Map.Entry<K, Versioned<V>> higherEntry(K key) {
        return complete(treeMap.higherEntry(key));
    }

    @Override
    public Map.Entry<K, Versioned<V>> lowerEntry(K key) {
        return complete(treeMap.lowerEntry(key));
    }

    @Override
    public Map.Entry<K, Versioned<V>> firstEntry() {
        return complete(treeMap.firstEntry());
    }

    @Override
    public Map.Entry<K, Versioned<V>> lastEntry() {
        return complete(treeMap.lastEntry());
    }

    @Override
    public Map.Entry<K, Versioned<V>> pollFirstEntry() {
        return complete(treeMap.pollFirstEntry());
    }

    @Override
    public Map.Entry<K, Versioned<V>> pollLastEntry() {
        return complete(treeMap.pollLastEntry());
    }

    @Override
    public K lowerKey(K key) {
        return complete(treeMap.lowerKey(key));
    }

    @Override
    public K floorKey(K key) {
        return complete(treeMap.floorKey(key));
    }

    @Override
    public K ceilingKey(K key) {
        return complete(treeMap.ceilingKey(key));
    }

    @Override
    public K higherKey(K key) {
        return complete(treeMap.higherKey(key));
    }


    @Override
    /**
     * {@inheritDoc}
     * <p>This may be a long operation with greater risk of timeout.</p>
     */
    public NavigableSet<K> navigableKeySet() {
        return complete(treeMap.navigableKeySet());
    }

    @Override
    public int size() {
        return complete(treeMap.size());
    }

    @Override
    public boolean isEmpty() {
        return complete(treeMap.isEmpty());
    }

    @Override
    public boolean containsKey(K key) {
        return complete(treeMap.containsKey(key));
    }

    @Override
    public boolean containsValue(V value) {
        return complete(treeMap.containsValue(value));
    }

    @Override
    public Versioned<V> get(K key) {
        return complete(treeMap.get(key));
    }

    @Override
    public Versioned<V> computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
        return complete(treeMap.computeIfAbsent(key, mappingFunction));
    }

    @Override
    public Versioned<V> compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        return complete(treeMap.compute(key, remappingFunction));
    }

    @Override
    public Versioned<V> computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        return complete(treeMap.computeIfPresent(key, remappingFunction));
    }

    @Override
    public Versioned<V> computeIf(K key, Predicate<? super V> condition,
                                  BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        return complete(treeMap.computeIf(key, condition, remappingFunction));
    }

    @Override
    public Versioned<V> put(K key, V value) {
        return complete(treeMap.put(key, value));
    }

    @Override
    public Versioned<V> putAndGet(K key, V value) {
        return complete(treeMap.putAndGet(key, value));
    }

    @Override
    public Versioned<V> remove(K key) {
        return complete(treeMap.remove(key));
    }

    @Override
    public void clear() {
        complete(treeMap.clear());
    }

    @Override
    public Set<K> keySet() {
        return complete(treeMap.keySet());
    }

    @Override
    public Collection<Versioned<V>> values() {
        return complete(treeMap.values());
    }

    @Override
    public Set<Map.Entry<K, Versioned<V>>> entrySet() {
        return complete(treeMap.entrySet());
    }

    @Override
    public Versioned<V> putIfAbsent(K key, V value) {
        return complete(treeMap.putIfAbsent(key, value));
    }

    @Override
    public boolean remove(K key, V value) {
        return complete(treeMap.remove(key, value));
    }

    @Override
    public boolean remove(K key, long version) {
        return complete(treeMap.remove(key, version));
    }

    @Override
    public Versioned<V> replace(K key, V value) {
        return complete(treeMap.replace(key, value));
    }

    @Override
    public boolean replace(K key, V oldValue, V newValue) {
        return complete(treeMap.replace(key, oldValue, newValue));
    }

    @Override
    public boolean replace(K key, long oldVersion, V newValue) {
        return complete(treeMap.replace(key, oldVersion, newValue));
    }

    @Override
    public void addListener(MapEventListener<K, V> listener) {
        complete(treeMap.addListener(listener));
    }

    @Override
    public void removeListener(MapEventListener<K, V> listener) {
        complete(treeMap.removeListener(listener));
    }

    @Override
    public Map<K, V> asJavaMap() {
        synchronized (this) {
            if (javaMap == null) {
                javaMap = new ConsistentMapBackedJavaMap<>(this);
            }
        }
        return javaMap;
    }
}