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#include "histogram_snapshot.h"
#include <util/stream/output.h>
#include <iostream>
namespace NMonitoring {
IHistogramSnapshotPtr ExplicitHistogramSnapshot(TConstArrayRef<TBucketBound> bounds, TConstArrayRef<TBucketValue> values, bool shrinkBuckets) {
Y_ENSURE(bounds.size() == values.size(),
"mismatched sizes: bounds(" << bounds.size() <<
") != buckets(" << values.size() << ')');
size_t requiredSize = shrinkBuckets ? std::min(bounds.size(), static_cast<size_t>(HISTOGRAM_MAX_BUCKETS_COUNT)) : bounds.size();
auto snapshot = TExplicitHistogramSnapshot::New(requiredSize);
if (requiredSize < bounds.size()) {
auto remains = bounds.size() % requiredSize;
auto divided = bounds.size() / requiredSize;
size_t idx{bounds.size()};
for (size_t i = requiredSize; i > 0; --i) {
Y_ENSURE(idx > 0);
(*snapshot)[i - 1].first = bounds[idx - 1];
(*snapshot)[i - 1].second = 0;
auto repeat = divided;
if (remains > 0) {
++repeat;
--remains;
}
for (; repeat > 0; --repeat) {
Y_ENSURE(idx > 0);
(*snapshot)[i - 1].second += values[idx - 1];
--idx;
}
}
} else {
for (size_t i = 0; i != bounds.size(); ++i) {
(*snapshot)[i].first = bounds[i];
(*snapshot)[i].second = values[i];
}
}
return snapshot;
}
} // namespace NMonitoring
namespace {
template <typename TStream>
auto& Output(TStream& os, const NMonitoring::IHistogramSnapshot& hist) {
os << TStringBuf("{");
ui32 i = 0;
ui32 count = hist.Count();
if (count > 0) {
for (; i < count - 1; ++i) {
os << hist.UpperBound(i) << TStringBuf(": ") << hist.Value(i);
os << TStringBuf(", ");
}
if (hist.UpperBound(i) == Max<NMonitoring::TBucketBound>()) {
os << TStringBuf("inf: ") << hist.Value(i);
} else {
os << hist.UpperBound(i) << TStringBuf(": ") << hist.Value(i);
}
}
os << TStringBuf("}");
return os;
}
} // namespace
std::ostream& operator<<(std::ostream& os, const NMonitoring::IHistogramSnapshot& hist) {
return Output(os, hist);
}
template <>
void Out<NMonitoring::IHistogramSnapshot>(IOutputStream& os, const NMonitoring::IHistogramSnapshot& hist) {
Output(os, hist);
}
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