#include <jack/jack.h>
#include <iostream>
#include <sstream>
#include <unistd.h>
#include <signal.h>

jack_client_t *client;
jack_port_t *iport;
jack_port_t *oport;

int wasted_loops = 0;

int sleep_seconds = 1;
int sleep_in_period = 100;
int counter = 0;

int process(jack_nframes_t frames, void *arg) {
	
	// std::cout << "process callback" << std::endl;
	jack_default_audio_sample_t *ibuf;
	ibuf = (jack_default_audio_sample_t*)jack_port_get_buffer(iport, frames);

	jack_default_audio_sample_t *obuf;
	obuf = (jack_default_audio_sample_t*)jack_port_get_buffer(oport, frames);

	for (jack_nframes_t frame = 0; frame < frames; frame++) {
		for (int i = 0; i < wasted_loops; ++i) {
			// do nothing
		}
		obuf[frame] = ibuf[frame];
	}
	counter++;
	if (counter == sleep_in_period) {
	  sleep(sleep_seconds);
	}

        return 0;
}
void signalled(int sig) {
  std::cout << "signalled" << std::endl;
}


int main(int argc, char *argv[]) {
	// default = 60 seconds
	unsigned int seconds_to_run = 60;
	if (argc > 1) {
		std::stringstream sec_stream;
		sec_stream << argv[1];
		sec_stream >> seconds_to_run;
		if (argc > 2) {
			std::stringstream waste_stream;
			waste_stream << argv[2];
			waste_stream >> wasted_loops;
			std::cout << "wasted loops: " << wasted_loops << std::endl;
		}
	}

	signal(SIGUSR2, signalled);

	std::cout << "seconds to run: " << seconds_to_run << std::endl;
	
	std::stringstream pid_stream;
	pid_stream << getpid();
	
        std::cout << "client_new" << std::endl;
        client = jack_client_new(pid_stream.str().c_str());

        std::cout << "port_register." << std::endl;
        iport = jack_port_register(client, "in", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput|JackPortIsTerminal, 0);
	oport = jack_port_register(client, "out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsTerminal|JackPortIsOutput, 0);

        std::cout << "set_process_callback" << std::endl;
        jack_set_process_callback(client, process, 0);

        std::cout << "activate" << std::endl;
        jack_activate(client);

        std::cout << "running" << std::endl;

        // while(1) {sleep(1);};
	sleep(seconds_to_run);

	jack_deactivate(client);
	jack_client_close(client);
}