#include "portaudiocpp/CppFunCallbackStream.hxx"

#include "portaudiocpp/StreamParameters.hxx"
#include "portaudiocpp/Exception.hxx"

namespace portaudio
{
    namespace impl
    {
        //////
        /// Adapts any a C++ callback to a C-callable function (ie this function). A
        /// pointer to a struct with the C++ function pointer and the actual user data should be
        /// passed as the ``userData'' parameter when setting up the callback.
        //////
        int cppCallbackToPaCallbackAdapter(const void *inputBuffer, void *outputBuffer, unsigned long numFrames,
            const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags, void *userData)
        {
            FunCallbackStream::CppToCCallbackData *data = static_cast<FunCallbackStream::CppToCCallbackData *>(userData);
            return data->funPtr(inputBuffer, outputBuffer, numFrames, timeInfo, statusFlags, data->userData);
        }
    }

    // -----------------------------------------------------------------------------------

    FunCallbackStream::CppToCCallbackData::CppToCCallbackData()
    {
    }

    FunCallbackStream::CppToCCallbackData::CppToCCallbackData(CallbackFunPtr funPtr, void *userData) : funPtr(funPtr), userData(userData)
    {
    }

    void FunCallbackStream::CppToCCallbackData::init(CallbackFunPtr funPtr, void *userData)
    {
        this->funPtr = funPtr;
        this->userData = userData;
    }

    // -----------------------------------------------------------------------------------

    FunCallbackStream::FunCallbackStream()
    {
    }

    FunCallbackStream::FunCallbackStream(const StreamParameters &parameters, CallbackFunPtr funPtr, void *userData) : adapterData_(funPtr, userData)
    {
        open(parameters);
    }

    FunCallbackStream::~FunCallbackStream()
    {
        try
        {
            close();
        }
        catch (...)
        {
            // ignore all errors
        }
    }

    void FunCallbackStream::open(const StreamParameters &parameters, CallbackFunPtr funPtr, void *userData)
    {
        adapterData_.init(funPtr, userData);
        open(parameters);
    }

    void FunCallbackStream::open(const StreamParameters &parameters)
    {
        PaError err = Pa_OpenStream(&stream_, parameters.inputParameters().paStreamParameters(), parameters.outputParameters().paStreamParameters(),
            parameters.sampleRate(), parameters.framesPerBuffer(), parameters.flags(), &impl::cppCallbackToPaCallbackAdapter,
            static_cast<void *>(&adapterData_));

        if (err != paNoError)
        {
            throw PaException(err);
        }
    }

    // -----------------------------------------------------------------------------------
}
