/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: RingBuffer.cpp
    Date: 2022-1-24
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "RingBuffer.hpp"

namespace Aurora::Logging::Sinks
{
    RingBufferSink::RingBufferSink(AuUInt32 count) : maxCount_(count)
    {

    }

    bool RingBufferSink::Init()
    {
        this->logMutex_ = AuThreadPrimitives::MutexUnique();
        this->logBuffer_.reserve(maxCount_);
        return static_cast<bool>(this->logMutex_);
    }

    void RingBufferSink::OnMessageBlocking(AuUInt8 level, const ConsoleMessage &msg)
    {}

    bool RingBufferSink::OnMessageNonblocking(AuUInt8 level, const ConsoleMessage &msg)
    {
        bool drop {};
        TryAddMsg(level, msg, drop);
        return false;
    }

    bool RingBufferSink::TryAddMsg(AuUInt8 level, const ConsoleMessage &msg, bool &drop)
    {
        AU_LOCK_GUARD(this->logMutex_);


        try
        {
            auto nextIndex = this->index_++;

            if (this->logBuffer_.size() < this->maxCount_)
            {
                if (nextIndex >= this->logBuffer_.size())
                {
                    return AuTryInsert(this->logBuffer_, msg);
                }
            }

            this->logBuffer_[nextIndex % this->logBuffer_.size()] = msg;
        }
        catch (...)
        {
            return false;
        }

        return true;
    }

    void RingBufferSink::SaveToPath(const AuString &path, bool binary)
    {
        auto file = AuIOFS::OpenWriteUnique(path);
        if (!file)
        {
            return;
        }

        for (const auto &message : Export())
        {
            if (binary)
            {
                AuByteBuffer buffer;
                message.Write(buffer);
                file->Write(AuMemoryViewRead(buffer));
            }
            else
            {
                file->Write(message.ToPersistentString());
                file->Write(AuLocale::NewLine());
            }
        }
    }

    AuList<ConsoleMessage> RingBufferSink::Export()
    {
        AU_LOCK_GUARD(this->logMutex_);
        AuList<ConsoleMessage> messages;

        auto nextIndex = this->index_;
        if (nextIndex >= this->logBuffer_.size())
        {
            auto nextIndex = (this->index_ + 1) % this->logBuffer_.size();

            for (AU_ITERATE_N_TO_X(i, nextIndex, this->logBuffer_.size()))
            {
                messages.push_back(this->logBuffer_[i]);
            }

            for (AU_ITERATE_N_TO_X(i, 0, nextIndex))
            {
                messages.push_back(this->logBuffer_[i]);
            }
        }
        else
        {
            for (AU_ITERATE_N_TO_X(i, 0, this->logBuffer_.size()))
            {
                messages.push_back(this->logBuffer_[i]);
            }
        }

        return messages;
    }

    void RingBufferSink::OnFlush()
    {
    }

    IBasicSinkRB *NewRingBufferNew(AuUInt32 maxLogEntries)
    {
        try
        {
            auto logger = _new RingBufferSink(maxLogEntries);
            if (!logger)
            {
                return nullptr;
            }

            if (!logger->Init())
            {
                return nullptr;
            }

            return logger;
        }
        catch (...)
        {
            return {};
        }
    }

    void NewRingBufferRelease(IBasicSink *logger)
    {
        AuSafeDelete<RingBufferSink *>(logger);
    }
}