#include <cstddef>
#include <iostream>

// Required typa alias for VTS processing funcs.
using VstInt32 = int32_t;

template<size_t nparams, size_t ninputs = 2, size_t noutputs = 2>
class LV2Plugin
{
public:
    LV2Plugin(double frame_rate)
        : rate(frame_rate)
    {}

    virtual ~LV2Plugin() {}

    void connect_port(uint32_t port, void * data)
    {
        if (port < nparams) {
            params[port] = static_cast<const float *>(data);
        }
        else if (port < nparams + ninputs) {
            in[port - nparams] = static_cast<const float *>(data);
        }
        else if (port < nparams + ninputs + noutputs) {
            out[port - nparams - ninputs] = static_cast<float *>(data);
        }
        else {
            std::cerr << "Invalid port " << port << ": ignoring." << std::endl;
        }
    }

    double getSampleRate() const
    {
        return rate;
    }

    virtual void activate() {}
    virtual void deactivate() {}

    const float * params[nparams];
    const float * in[ninputs];
    float * out[noutputs];

private:
    double rate;
};