/** Node-type for signal generation.
 *
 * @file
 * @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache 2.0
 *********************************************************************************/

#pragma once

#include <villas/timing.hpp>
#include <villas/task.hpp>

namespace villas {
namespace node {

/* Forward declarations */
class NodeCompat;
struct Sample;

struct signal_node {
	struct Task task;		/**< Timer for periodic events. */
	int rt;				/**< Real-time mode? */

	enum class SignalType {
		RANDOM,
		SINE,
		SQUARE,
		TRIANGLE,
		RAMP,
		COUNTER,
		CONSTANT,
		MIXED,
		PULSE
	} *type;			/**< Signal type */

	double rate;			/**< Sampling rate. */
	double *frequency;		/**< Frequency of the generated signals. */
	double *amplitude;		/**< Amplitude of the generated signals. */
	double *stddev;			/**< Standard deviation of random signals (normal distributed). */
	double *offset;			/**< A constant bias. */
	double *pulse_width;		/**< Width of a pulse with respect to the rate (duration = pulse_width/rate) */
	double *pulse_low;		/**< Amplitude when pulse signal is off */
	double *pulse_high;		/**< Amplitude when pulse signal is on */
	double *phase;			/**< Phase (rad) offset with respect to program start */
	int monitor_missed;		/**< Boolean, if set, node counts missed steps and warns user. */

	double *last;			/**< The values from the previous period which are required for random walk. */

	unsigned values;			/**< The number of values which will be emitted by this node. */
	int limit;			/**< The number of values which should be generated by this node. <0 for infinitve. */

	struct timespec started;	/**< Point in time when this node was started. */
	unsigned counter;			/**< The number of packets already emitted. */
	unsigned missed_steps;		/**< Total number of missed steps. */
};

char * signal_node_print(NodeCompat *n);

int signal_node_parse(NodeCompat *n, json_t *json);

int signal_node_start(NodeCompat *n);

int signal_node_stop(NodeCompat *n);

int signal_node_init(NodeCompat *n);

int signal_node_destroy(NodeCompat *n);

int signal_node_prepare(NodeCompat *n);

int signal_node_read(NodeCompat *n, struct Sample * const smps[], unsigned cnt);

int signal_node_poll_fds(NodeCompat *n, int fds[]);

} /* namespace node */
} /* namespace villas */