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/*
 *
 * Copyright 2015, Google 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 Google Inc. 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
 * OWNER 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.
 *
 */

#ifndef TEST_QPS_HISTOGRAM_H
#define TEST_QPS_HISTOGRAM_H

#include <grpc/support/histogram.h>
#include "src/proto/grpc/testing/stats.grpc.pb.h"

namespace grpc {
namespace testing {

class Histogram {
 public:
  // TODO: look into making histogram params not hardcoded for C++
  Histogram()
      : impl_(gpr_histogram_create(default_resolution(),
                                   default_max_possible())) {}
  ~Histogram() {
    if (impl_) gpr_histogram_destroy(impl_);
  }
  Histogram(Histogram&& other) : impl_(other.impl_) { other.impl_ = nullptr; }

  void Merge(const Histogram& h) { gpr_histogram_merge(impl_, h.impl_); }
  void Add(double value) { gpr_histogram_add(impl_, value); }
  double Percentile(double pctile) const {
    return gpr_histogram_percentile(impl_, pctile);
  }
  double Count() const { return gpr_histogram_count(impl_); }
  void Swap(Histogram* other) { std::swap(impl_, other->impl_); }
  void FillProto(HistogramData* p) {
    size_t n;
    const auto* data = gpr_histogram_get_contents(impl_, &n);
    for (size_t i = 0; i < n; i++) {
      p->add_bucket(data[i]);
    }
    p->set_min_seen(gpr_histogram_minimum(impl_));
    p->set_max_seen(gpr_histogram_maximum(impl_));
    p->set_sum(gpr_histogram_sum(impl_));
    p->set_sum_of_squares(gpr_histogram_sum_of_squares(impl_));
    p->set_count(gpr_histogram_count(impl_));
  }
  void MergeProto(const HistogramData& p) {
    gpr_histogram_merge_contents(impl_, &*p.bucket().begin(), p.bucket_size(),
                                 p.min_seen(), p.max_seen(), p.sum(),
                                 p.sum_of_squares(), p.count());
  }

  static double default_resolution() { return 0.01; }
  static double default_max_possible() { return 60e9; }

 private:
  Histogram(const Histogram&);
  Histogram& operator=(const Histogram&);

  gpr_histogram* impl_;
};
}
}

#endif /* TEST_QPS_HISTOGRAM_H */