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/*
 * Copyright 2016-present Open Networking Foundation
 *
 * 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.AsyncConsistentTreeMap;
import org.onosproject.store.service.AsyncIterator;
import org.onosproject.store.service.ConsistentMapException;
import org.onosproject.store.service.ConsistentTreeMap;
import org.onosproject.store.service.MapEventListener;
import org.onosproject.store.service.Synchronous;
import org.onosproject.store.service.Versioned;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
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
        extends Synchronous>
        implements ConsistentTreeMap {
    private final AsyncConsistentTreeMap treeMap;
    private final long operationTimeoutMillis;
    private Map javaMap;

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

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

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

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

    @Override
    public Map.Entry> ceilingEntry(String key) {
        return complete(treeMap.ceilingEntry(key));
    }

    @Override
    public Map.Entry> floorEntry(String key) {
        return complete(treeMap.floorEntry(key));
    }

    @Override
    public Map.Entry> higherEntry(String key) {
        return complete(treeMap.higherEntry(key));
    }

    @Override
    public Map.Entry> lowerEntry(String key) {
        return complete(treeMap.lowerEntry(key));
    }

    @Override
    public Map.Entry> firstEntry() {
        return complete(treeMap.firstEntry());
    }

    @Override
    public Map.Entry> lastEntry() {
        return complete(treeMap.lastEntry());
    }

    @Override
    public Map.Entry> pollFirstEntry() {
        return complete(treeMap.pollFirstEntry());
    }

    @Override
    public Map.Entry> pollLastEntry() {
        return complete(treeMap.pollLastEntry());
    }

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

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

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

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


    @Override
    /**
     * {@inheritDoc}
     * This may be a long operation with greater risk of timeout.
     */
    public NavigableSet 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(String key) {
        return complete(treeMap.containsKey(key));
    }

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

    @Override
    public Versioned get(String key) {
        return complete(treeMap.get(key));
    }

    @Override
    public Versioned getOrDefault(String key, V defaultValue) {
        return complete(treeMap.getOrDefault(key, defaultValue));
    }

    @Override
    public Versioned computeIfAbsent(String key,
                                        Function mappingFunction) {
        return complete(treeMap.computeIfAbsent(key, mappingFunction));
    }

    @Override
    public Versioned compute(String key,
                                BiFunction remappingFunction) {
        return complete(treeMap.compute(key, remappingFunction));
    }

    @Override
    public Versioned computeIfPresent(
            String key,
            BiFunction remappingFunction) {
        return complete(treeMap.computeIfPresent(key, remappingFunction));
    }

    @Override
    public Versioned computeIf(String key, Predicate condition,
                                  BiFunction remappingFunction) {
        return complete(treeMap.computeIf(key, condition, remappingFunction));
    }

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

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

    @Override
    public Versioned remove(String key) {
        return complete(treeMap.remove(key));
    }

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

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

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

    @Override
    public Set>> entrySet() {
        return complete(treeMap.entrySet());
    }

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

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

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

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

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

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

    @Override
    public Iterator>> iterator() {
        return new DefaultIterator<>(complete(treeMap.iterator()));
    }

    @Override
    public void addListener(MapEventListener listener,
                            Executor executor) {
        complete(treeMap.addListener(listener, executor));
    }

    @Override
    public void removeListener(MapEventListener listener) {
        complete(treeMap.removeListener(listener));
    }

    private class DefaultIterator implements Iterator>> {
        private final AsyncIterator>> iterator;

        public DefaultIterator(AsyncIterator>> iterator) {
            this.iterator = iterator;
        }

        @Override
        public boolean hasNext() {
            return complete(iterator.hasNext());
        }

        @Override
        public Map.Entry> next() {
            return complete(iterator.next());
        }
    }

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

    @Override
    public NavigableMap subMap(String upperKey,
                                          String lowerKey,
                                          boolean inclusiveUpper,
                                          boolean inclusiveLower) {
        return complete(treeMap.subMap(upperKey, lowerKey,
                                       inclusiveUpper, inclusiveLower));
    }
}