#ifndef _LSUP_CORE_H
#define _LSUP_CORE_H

#include <ctype.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <uuid/uuid.h>

#ifdef DEBUG
#define DEBUG_TEST 1
#else
#define DEBUG_TEST 0
#endif
#define STR "%s\n"
#define TRACE(fmt, ...) \
        do {\
            if (DEBUG_TEST) \
                fprintf(stderr, "%s:%d:%s(): " fmt "\n", \
                        __FILE__,  __LINE__, __func__, __VA_ARGS__); \
        } while (0)

#define LIKELY(x)       __builtin_expect(!!(x), true)
#define UNLIKELY(x)     __builtin_expect(!!(x), false)
// TODO Handle memory errors better.
#define CRITICAL(exp)   if (UNLIKELY(((exp) == NULL))) { abort(); }

#define KLEN sizeof(LSUP_Key)
#define DBL_KLEN sizeof(LSUP_DoubleKey)
#define TRP_KLEN sizeof(LSUP_TripleKey)
#define QUAD_KLEN sizeof(LSUP_QuadKey)

# define UUIDSTR_SIZE 37

// Handy flags operations.
#define SET_FLAG(n, f) ((n) |= (f))
#define CLR_FLAG(n, f) ((n) &= ~(f))
#define TGL_FLAG(n, f) ((n) ^= (f))
#define CHK_FLAG(n, f) ((n) & (f))



/* * * RETURN CODES * * */

/**
 * 0 is success, positive integers (>88800) are warnings, and negative integers
 * (<-88800) are errors.
 */
typedef enum {
    LSUP_OK             = 0,

    LSUP_NOACTION       = 88801,
    LSUP_NORESULT       = 88802,
    LSUP_END            = 88803,

    LSUP_ERROR          = -88801,
    LSUP_PARSE_ERR      = -88802,
    LSUP_VALUE_ERR      = -88803,
    LSUP_TXN_ERR        = -88804,
} LSUP_rc;

typedef size_t LSUP_Key;
typedef LSUP_Key LSUP_DoubleKey[2];
typedef LSUP_Key LSUP_TripleKey[3];
typedef LSUP_Key LSUP_QuadKey[4];

typedef char uuid_str_t[UUIDSTR_SIZE];

// Don't use MIN and MAX macros: see
// https://dustri.org/b/min-and-max-macro-considered-harmful.html
inline int min(int x, int y) { return x < y ? x : y; }

inline int max(int x, int y) { return x > y ? x : y; }


// Error handling via goto.
#define CHECK(exp, marker) rc = (exp); if (rc != LSUP_OK) goto marker

// Jump if rc is negative (skip warnings).
#define PCHECK(exp, marker) rc = (exp); if (rc < LSUP_OK) goto marker

// Check against a list of allowed return codes.
// If none match, jump to marker.
#define MCHECK(exp, allowed, marker)                                    \
    rc = (exp);                                                         \
    bool jump = true;                                                   \
    for(int i = 0; i < sizeof(allowed) / sizeof(int); i++) {            \
        if (rc == allowed[i]) {                                         \
            jump = false;                                               \
            break;                                                      \
        }                                                               \
    }                                                                   \
    if (jump) goto marker;                                              \

#endif