//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//

#include "FileOnlyProfilingConnection.hpp"
#include "PacketVersionResolver.hpp"

#include <armnn/Exceptions.hpp>

#include <boost/numeric/conversion/cast.hpp>
#include <iostream>
#include <thread>

namespace armnn
{

namespace profiling
{

FileOnlyProfilingConnection::~FileOnlyProfilingConnection()
{
    Close();
}

bool FileOnlyProfilingConnection::IsOpen() const
{
    // This type of connection is always open.
    return true;
}

void FileOnlyProfilingConnection::Close()
{
    // Dump any unread packets out of the queue.
    for (unsigned int i = 0; i < m_PacketQueue.size(); i++)
    {
        m_PacketQueue.pop();
    }
}

bool FileOnlyProfilingConnection::WaitForStreamMeta(const unsigned char* buffer, uint32_t length)
{
    IgnoreUnused(length);

    // The first word, stream_metadata_identifer, should always be 0.
    if (ToUint32(buffer, TargetEndianness::BeWire) != 0)
    {
        Fail("Protocol error. The stream_metadata_identifer was not 0.");
    }

    // Before we interpret the length we need to read the pipe_magic word to determine endianness.
    if (ToUint32(buffer + 8, TargetEndianness::BeWire) == PIPE_MAGIC)
    {
        m_Endianness = TargetEndianness::BeWire;
    }
    else if (ToUint32(buffer + 8, TargetEndianness::LeWire) == PIPE_MAGIC)
    {
        m_Endianness = TargetEndianness::LeWire;
    }
    else
    {
        Fail("Protocol read error. Unable to read PIPE_MAGIC value.");
    }
    return true;
}

void FileOnlyProfilingConnection::SendConnectionAck()
{
    if (!m_QuietOp)
    {
        std::cout << "Sending connection acknowledgement." << std::endl;
    }
    std::unique_ptr<unsigned char[]> uniqueNullPtr = nullptr;
    {
        std::lock_guard<std::mutex> lck(m_PacketAvailableMutex);
        m_PacketQueue.push(Packet(0x10000, 0, uniqueNullPtr));
    }
    m_ConditionPacketAvailable.notify_one();
}

bool FileOnlyProfilingConnection::SendCounterSelectionPacket()
{
    uint32_t uint16_t_size = sizeof(uint16_t);
    uint32_t uint32_t_size = sizeof(uint32_t);

    uint32_t offset   = 0;
    uint32_t bodySize = uint32_t_size + boost::numeric_cast<uint32_t>(m_IdList.size()) * uint16_t_size;

    auto uniqueData     = std::make_unique<unsigned char[]>(bodySize);
    unsigned char* data = reinterpret_cast<unsigned char*>(uniqueData.get());

    // Copy capturePeriod
    WriteUint32(data, offset, m_Options.m_CapturePeriod);

    // Copy m_IdList
    offset += uint32_t_size;
    for (const uint16_t& id : m_IdList)
    {
        WriteUint16(data, offset, id);
        offset += uint16_t_size;
    }

    {
        std::lock_guard<std::mutex> lck(m_PacketAvailableMutex);
        m_PacketQueue.push(Packet(0x40000, bodySize, uniqueData));
    }
    m_ConditionPacketAvailable.notify_one();

    return true;
}

bool FileOnlyProfilingConnection::WritePacket(const unsigned char* buffer, uint32_t length)
{
    ARMNN_ASSERT(buffer);

    // Read Header and determine case
    uint32_t outgoingHeaderAsWords[2];
    PackageActivity packageActivity = GetPackageActivity(buffer, outgoingHeaderAsWords);

    switch (packageActivity)
    {
        case PackageActivity::StreamMetaData:
        {
            if (!WaitForStreamMeta(buffer, length))
            {
                return EXIT_FAILURE;
            }

            SendConnectionAck();
            break;
        }
        case PackageActivity::CounterDirectory:
        {
            std::unique_ptr<unsigned char[]> uniqueCounterData = std::make_unique<unsigned char[]>(length - 8);

            std::memcpy(uniqueCounterData.get(), buffer + 8, length - 8);

            Packet directoryPacket(outgoingHeaderAsWords[0], length - 8, uniqueCounterData);

            armnn::profiling::PacketVersionResolver packetVersionResolver;
            DirectoryCaptureCommandHandler directoryCaptureCommandHandler(
                0, 2, packetVersionResolver.ResolvePacketVersion(0, 2).GetEncodedValue());
            directoryCaptureCommandHandler.operator()(directoryPacket);
            const ICounterDirectory& counterDirectory = directoryCaptureCommandHandler.GetCounterDirectory();
            for (auto& category : counterDirectory.GetCategories())
            {
                // Remember we need to translate the Uid's from our CounterDirectory instance to the parent one.
                std::vector<uint16_t> translatedCounters;
                for (auto const& copyUid : category->m_Counters)
                {
                    translatedCounters.emplace_back(directoryCaptureCommandHandler.TranslateUIDCopyToOriginal(copyUid));
                }
                m_IdList.insert(std::end(m_IdList), std::begin(translatedCounters), std::end(translatedCounters));
            }
            SendCounterSelectionPacket();
            break;
        }
        default:
        {
            break;
        }
    }
    return true;
}

Packet FileOnlyProfilingConnection::ReadPacket(uint32_t timeout)
{
    std::unique_lock<std::mutex> lck(m_PacketAvailableMutex);

    // Here we are using m_PacketQueue.empty() as a predicate variable
    // The conditional variable will wait until packetQueue is not empty or until a timeout
    if(!m_ConditionPacketAvailable.wait_for(lck,
                                            std::chrono::milliseconds(timeout),
                                            [&]{return !m_PacketQueue.empty();}))
    {
        throw armnn::TimeoutException("Thread has timed out as per requested time limit");
    }

    Packet returnedPacket = std::move(m_PacketQueue.front());
    m_PacketQueue.pop();
    return returnedPacket;
}

PackageActivity FileOnlyProfilingConnection::GetPackageActivity(const unsigned char* buffer, uint32_t headerAsWords[2])
{
    headerAsWords[0] = ToUint32(buffer, m_Endianness);
    headerAsWords[1] = ToUint32(buffer + 4, m_Endianness);
    if (headerAsWords[0] == 0x20000)    // Packet family = 0 Packet Id = 2
    {
        return PackageActivity::CounterDirectory;
    }
    else if (headerAsWords[0] == 0)    // Packet family = 0 Packet Id = 0
    {
        return PackageActivity::StreamMetaData;
    }
    else
    {
        return PackageActivity::Unknown;
    }
}

uint32_t FileOnlyProfilingConnection::ToUint32(const unsigned char* data, TargetEndianness endianness)
{
    // Extract the first 4 bytes starting at data and push them into a 32bit integer based on the
    // specified endianness.
    if (endianness == TargetEndianness::BeWire)
    {
        return static_cast<uint32_t>(data[0]) << 24 | static_cast<uint32_t>(data[1]) << 16 |
               static_cast<uint32_t>(data[2]) << 8 | static_cast<uint32_t>(data[3]);
    }
    else
    {
        return static_cast<uint32_t>(data[3]) << 24 | static_cast<uint32_t>(data[2]) << 16 |
               static_cast<uint32_t>(data[1]) << 8 | static_cast<uint32_t>(data[0]);
    }
}

void FileOnlyProfilingConnection::Fail(const std::string& errorMessage)
{
    Close();
    throw RuntimeException(errorMessage);
}

}    // namespace profiling

}    // namespace armnn