/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: FileWriter.hpp
    Date: 2021-6-10
    Author: Reece
***/
#pragma once

namespace Aurora::IO::FS
{
    struct FileWriter : IStreamWriter
    {
        AU_NO_COPY_NO_MOVE(FileWriter)
        
        inline FileWriter() {}
        inline FileWriter(const AuSPtr<IFileStream> &stream) : stream_(stream) { }
        inline ~FileWriter()  {}

        template<typename... T>
        inline bool OpenFile(T... args)
        {
            this->stream_ = OpenWriteShared(args...);
            return bool(this->stream_);
        }

        inline virtual EStreamError IsOpen() override
        {
            return this->stream_ ? EStreamError::eErrorNone : EStreamError::eErrorStreamNotOpen;
        }

        inline virtual EStreamError Write(const Memory::MemoryViewStreamRead &parameters) override
        {
            if (!this->stream_)
            {
                return EStreamError::eErrorStreamNotOpen;
            }

            if (!this->stream_->Write(parameters))
            {
                return EStreamError::eErrorStreamInterrupted;
            }

            if (parameters.outVariable == 0)
            {
                return EStreamError::eErrorEndOfStream;
            }

            if (parameters.outVariable != parameters.length)
            {
                return EStreamError::eErrorStreamInterrupted;
            }

            return EStreamError::eErrorNone;
        }

        inline virtual void Flush() override
        {
            if (this->stream_)
            {
                this->stream_->Flush();
            }
        }

        inline virtual void Close() override
        {
            this->stream_.reset();
        }

        inline virtual AuUInt64 GetPosition()
        {
            return this->stream_ ? this->stream_->GetOffset() : 0;
        }

        inline virtual bool SetPosition(AuUInt64 pos)
        {
            return this->stream_ ? this->stream_->SetOffset(pos) : false;
        }

    private:
        AuSPtr<IFileStream> stream_ {};
    };
}