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/*
 * Copyright (c) 2016, Groupon, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * Neither the name of GROUPON nor the names of its contributors may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.groupon.lex.metrics.timeseries;

import com.groupon.lex.metrics.GroupName;
import com.groupon.lex.metrics.MetricName;
import com.groupon.lex.metrics.MetricValue;
import gnu.trove.map.hash.THashMap;
import static java.util.Collections.unmodifiableMap;
import java.util.Map;
import static java.util.Objects.requireNonNull;
import java.util.function.Function;
import java.util.stream.Stream;

/**
 *
 * @author ariane
 */
public final class MutableTimeSeriesValue extends AbstractTimeSeriesValue implements TimeSeriesValue {
    private GroupName group_;
    private final Map metrics_ = new THashMap<>(4, 1);  // Favour small, dense hashmaps, since there are a lot of instances.

    public MutableTimeSeriesValue(GroupName group) {
        group_ = requireNonNull(group);
    }

    public MutableTimeSeriesValue(GroupName group, Map metrics) {
        this(group, metrics.entrySet().stream(), Map.Entry::getKey, Map.Entry::getValue);
    }

    public  MutableTimeSeriesValue(GroupName group, Stream metric_stream, Function name_fn, Function value_fn) {
        group_ = requireNonNull(group);
        metric_stream.forEach((T t) -> metrics_.put(requireNonNull(name_fn.apply(t)), requireNonNull(value_fn.apply(t))));
    }

    public MutableTimeSeriesValue(TimeSeriesValue tsv) {
        this(tsv.getGroup(), tsv.getMetrics());
    }

    @Override
    public GroupName getGroup() {
        return group_;
    }

    public MutableTimeSeriesValue setGroup(GroupName group) {
        group_ = requireNonNull(group);
        return this;
    }

    @Override
    public Map getMetrics() {
        return unmodifiableMap(metrics_);
    }

    public MutableTimeSeriesValue addMetric(MetricName name, MetricValue value) {
        metrics_.put(name, value);
        return this;
    }

    public MutableTimeSeriesValue addMetrics(Map values) {
        return addMetrics(values.entrySet().stream(), Map.Entry::getKey, Map.Entry::getValue);
    }

    public  MutableTimeSeriesValue addMetrics(Stream values, Function name_fn, Function value_fn) {
        values.forEach(v -> addMetric(requireNonNull(name_fn.apply(v)), requireNonNull(value_fn.apply(v))));
        return this;
    }

    @Override
    public MutableTimeSeriesValue clone() {
        return new MutableTimeSeriesValue(this);
    }
}