#ifndef __STATEMACHINE_H__
#define __STATEMACHINE_H__

#ifdef __cplusplus
extern "C" {
#endif
#if 0
} // workaround for CB folding bug
#endif

#include <stdint.h>


enum SM_EVENTS {
   EV_STATE_ENTER,
   EV_STATE_EXIT,
   EV_TIMER_TICK,

   EV_USER_FIRST
};

#define  SM_SET_STATE(st)    do { \
   ((STATE_MACHINE*)me)->StateNew = (SM_STATE_FUNC*)(st); \
} while (0)

#define  SM_SET_STATE_DELAYED(st, delay)    do { \
   ((STATE_MACHINE*)me)->StateDelayed = (SM_STATE_FUNC*)(st); \
   ((STATE_MACHINE*)me)->Timer_StateDelay = delay; \
   ((STATE_MACHINE*)me)->StateNew = &SM_ST_StateDelayed; \
} while (0)

struct _STATE_MACHINE;
typedef struct _STATE_MACHINE STATE_MACHINE;
typedef void SM_STATE_FUNC(STATE_MACHINE* me, uint16_t event);

struct _STATE_MACHINE {
   SM_STATE_FUNC*  State;        // actual state
   SM_STATE_FUNC*  StateNew;     // new state
   SM_STATE_FUNC*  StateDelayed; // auto state switch after delay
   SM_STATE_FUNC*  StateReturn;  // return state for nested states
   uint16_t Timer_StateDelay;
};

extern void StateMachineInit(STATE_MACHINE* const me, SM_STATE_FUNC* const init_state);
extern void StateMachine(STATE_MACHINE* const me, uint16_t ev);
extern void SM_ST_StateDelayed(STATE_MACHINE* const me, uint16_t event);

#if 0
{  // workaround for CB folding bug
#endif
#ifdef __cplusplus
}
#endif

#endif // __STATEMACHINE_H__