/*
 * Copyright 2014-2025 Real Logic Limited.
 *
 * Licensed 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
 *
 * https://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.
 */
#ifndef AERON_CONCURRENT_ERROR_LOG_READER_H
#define AERON_CONCURRENT_ERROR_LOG_READER_H

#include <functional>
#include "util/BitUtil.h"
#include "concurrent/AtomicBuffer.h"
#include "concurrent/errors/ErrorLogDescriptor.h"

namespace aeron { namespace concurrent { namespace errors {

namespace ErrorLogReader {

using namespace aeron::concurrent;

typedef std::function<void(
    std::int32_t observationCount,
    std::int64_t firstObservationTimestamp,
    std::int64_t lastObservationTimestamp,
    const std::string &encodedException)> error_consumer_t;

inline static int read(AtomicBuffer &buffer, const error_consumer_t &consumer, std::int64_t sinceTimestamp)
{
    int entries = 0;
    int offset = 0;
    const int capacity = buffer.capacity();

    while (offset < capacity)
    {
        const std::int32_t length = buffer.getInt32Volatile(offset + ErrorLogDescriptor::LENGTH_OFFSET);
        if (0 == length)
        {
            break;
        }

        const std::int64_t lastObservationTimestamp =
            buffer.getInt64Volatile(offset + ErrorLogDescriptor::LAST_OBSERVATION_TIMESTAMP_OFFSET);

        if (lastObservationTimestamp >= sinceTimestamp)
        {
            auto &entry = buffer.overlayStruct<ErrorLogDescriptor::ErrorLogEntryDefn>(offset);

            ++entries;

            consumer(
                entry.observationCount,
                entry.firstObservationTimestamp,
                lastObservationTimestamp,
                buffer.getStringWithoutLength(
                    offset + ErrorLogDescriptor::ENCODED_ERROR_OFFSET,
                    static_cast<std::size_t>(length - ErrorLogDescriptor::HEADER_LENGTH)));
        }

        offset += util::BitUtil::align(length, ErrorLogDescriptor::RECORD_ALIGNMENT);
    }

    return entries;
}

}}}}

#endif
