#ifndef _LSUP_TRIPLE_H
#define _LSUP_TRIPLE_H

#include "term.h"

typedef struct LSUP_Triple {
    LSUP_Term *s;
    LSUP_Term *p;
    LSUP_Term *o;
} LSUP_Triple;

typedef struct LSUP_SerTriple {
    LSUP_SerTerm *s;
    LSUP_SerTerm *p;
    LSUP_SerTerm *o;
} LSUP_SerTriple;

typedef enum {
    TRP_POS_S = 0,
    TRP_POS_P = 1,
    TRP_POS_O = 2,
} LSUP_TriplePos;


#define _FN_BODY \
    if (n == 0) return trp->s; \
    if (n == 1) return trp->p; \
    if (n == 2) return trp->o; \
    return NULL;


/** @brief Get triple by term position.
 *
 * Useful for looping over all terms.
 *
 * @param trp[in] Triple pointer.
 *
 * @param n[in] A number between 0÷2.
 *
 * @return Corresponding triple term or NULL if n is out of range.
 */
inline LSUP_Term *
LSUP_triple_term_by_pos(const LSUP_Triple *trp, LSUP_TriplePos n)
{ _FN_BODY }


/** @brief Get serialized triple by term position.
 *
 * Useful for looping over all terms.
 *
 * @param trp[in] Serialized triple pointer.
 *
 * @param n[in] A number between 0÷2.
 *
 * @return Corresponding serialized term or NULL if n is out of range.
 */
inline LSUP_SerTerm *
LSUP_ser_triple_term_by_pos(const LSUP_SerTriple *trp, LSUP_TriplePos n)
{ _FN_BODY }


// TODO Add constructors and destructors with term type checks.
#endif