// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

#include "predicate_attribute_saver.h"
#include "iattributesavetarget.h"
#include <vespa/searchlib/predicate/i_saver.h>
#include <vespa/searchlib/predicate/nbo_write.h>
#include <filesystem>

#include <vespa/log/log.h>
LOG_SETUP(".searchlib.attribute.predicate_attribute_saver");

using search::predicate::nbo_write;

namespace search {

PredicateAttributeSaver::PredicateAttributeSaver(GenerationHandler::Guard &&guard,
                                                 const attribute::AttributeHeader &header,
                                                 uint32_t version,
                                                 std::unique_ptr<predicate::ISaver> index_saver,
                                                 MinFeatureVector min_feature,
                                                 IntervalRangeVector interval_range_vector,
                                                 uint16_t max_interval_range)
    : AttributeSaver(std::move(guard), header),
      _version(version),
      _index_saver(std::move(index_saver)),
      _min_feature(std::move(min_feature)),
      _interval_range_vector(std::move(interval_range_vector)),
      _max_interval_range(max_interval_range)
{
}

PredicateAttributeSaver::~PredicateAttributeSaver() = default;

bool
PredicateAttributeSaver::onSave(IAttributeSaveTarget& save_target)
{
    auto name = std::filesystem::path(get_file_name()).filename().native();
    LOG(info, "Saving predicate attribute version %u name '%s'", _version, name.c_str());
    auto writer = save_target.datWriter().allocBufferWriter();
    _index_saver->save(*writer);
    uint32_t  highest_doc_id = static_cast<uint32_t>(_min_feature.size() - 1);
    nbo_write<uint32_t>(*writer, highest_doc_id);
    writer->write(&_min_feature[1], highest_doc_id);
    for (size_t i = 1; i <= highest_doc_id; ++i) {
        nbo_write<uint16_t>(*writer, _interval_range_vector[i]);
    }
    nbo_write<uint16_t>(*writer, _max_interval_range);
    writer->flush();
    return true;
}

}