#ifndef MAIN_H_
#define MAIN_H_

#include "util.h"

#include <stdint.h>


typedef uint16_t jiffies_t;
typedef int16_t s_jiffies_t;

/* Jiffies timing helpers derived from the Linux Kernel sources.
 * These inlines deal with timer wrapping correctly.
 *
 * time_after(a, b) returns true if the time a is after time b.
 *
 * Do this with "<0" and ">=0" to only test the sign of the result. A
 * good compiler would generate better code (and a really good compiler
 * wouldn't care). Gcc is currently neither.
 */
#define time_after(a, b)	((s_jiffies_t)(b) - (s_jiffies_t)(a) < 0)
#define time_before(a, b)	time_after(b, a)

#define JIFFIES_PER_SECOND	1000
#define msec_to_jiffies(msec)	((jiffies_t)((uint32_t)JIFFIES_PER_SECOND * (uint32_t)(msec) / (uint32_t)1000))

jiffies_t get_jiffies(void);


struct pressure_config {
	/* Desired pressure in mBar */
	uint16_t desired;
	/* Pressure hysteresis in mBar */
	uint16_t hysteresis;
	/* Auto-adjustment is enabled. */
	bool autoadjust_enable;
};

struct pressure_state {
	/* Sensing and adjustment logic enabled? */
	bool device_enabled;
	/* Current pressure in the tank (in mBar) */
	uint16_t mbar;
	/* Reported pressure via RS232 */
	uint16_t reported_mbar;
	/* True, if the current pressure value needs checking against
	 * the desired pressure config. */
	bool needs_checking;
	/* Trigger count:
	 * >0 = waiting
	 * 0  = trigger now
	 * -1 = triggered and running. */
	int8_t sensor_trigger_cnt;
};

void get_pressure_config(struct pressure_config *cfg);
void set_pressure_config(struct pressure_config *cfg);
void get_pressure_state(struct pressure_state *state);
void prepare_turn_on(void);
void prepare_shutdown(void);


struct valves;
extern struct valves xy_control_valves;
extern struct valves z_control_valves;


#endif /* MAIN_H_ */