#include "gtl_hw_audio_input_device.h"

#include <QDebug>

namespace gtl
{
    namespace hw
    {
        audio_input_device::audio_input_device(QObject *parent)
            : QIODevice{parent}
            , _buffer(1000)
            , _ptr_recv(0)
            , _ptr_send(0)
            , _frame_bytes(1)
        {

        }

        void audio_input_device::set_buffer(qreal rate, int frame_bytes)
        {
            _buffer.resize(rate * frame_bytes);
            _ptr_recv = 0;
            _ptr_send = 0;
            _frame_bytes = frame_bytes;
        }

        void audio_input_device::get_data(std::back_insert_iterator<std::vector<char>> buffer)
        {
            int ptr_send = _ptr_send;
            int cnt = 0;
            while(ptr_send != _ptr_recv)
            {
                ptr_send = (ptr_send + 1) % _buffer.size();
                cnt++;

                if(cnt % _frame_bytes == 0)
                {
                    auto begin = _buffer.begin() + _ptr_send;
                    auto end = ptr_send == 0 ? _buffer.end() : _buffer.begin() + ptr_send;

                    std::copy(begin, end, buffer);
                    _ptr_send = ptr_send;
                }
            }

//            qDebug() << "prt_send: " << _ptr_send;
        }

        qint64 audio_input_device::readData(char *data, qint64 maxSize)
        {
            Q_UNUSED(data);
            Q_UNUSED(maxSize);
            return -1;
        }

        qint64 audio_input_device::writeData(const char *data, qint64 maxSize)
        {
            int cnt = 0;
            while(cnt != maxSize)
            {
                int size = std::min<int>(_buffer.size() - _ptr_recv, maxSize - cnt);

                std::copy(&data[cnt], &data[cnt + size], &_buffer[_ptr_recv]);

                _ptr_recv = (_ptr_recv + size) % _buffer.size();

                cnt += size;
            }

//            qDebug() << "prt_recv: " << _ptr_recv;

            return maxSize;
        }
    }
}