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/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.script;

import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;

/**
 * DynamicMap is used to wrap a Map for a script parameter. A set of
 * functions is provided for the overridden values where the function
 * is applied to the existing value when one exists for the
 * corresponding key.
 */
public final class DynamicMap implements Map {

    private final Map delegate;

    private final Map> functions;

    public DynamicMap(Map delegate, Map> functions) {
        this.delegate = delegate;
        this.functions = functions;
    }

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

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

    @Override
    public boolean containsKey(final Object key) {
        return delegate.containsKey(key);
    }

    @Override
    public boolean containsValue(final Object value) {
        return delegate.containsValue(value);
    }

    @Override
    public Object get(final Object key) {
        Object value = delegate.get(key);
        Function function = functions.get(key);
        if (function != null) {
            value = function.apply(value);
        }
        return value;
    }

    @Override
    public Object put(final String key, final Object value) {
        return delegate.put(key, value);
    }

    @Override
    public Object remove(final Object key) {
        return delegate.remove(key);
    }

    @Override
    public void putAll(final Map m) {
        delegate.putAll(m);
    }

    @Override
    public void clear() {
        delegate.clear();
    }

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

    @Override
    public Collection