#ifndef _LSUP_CORE_H
#define _LSUP_CORE_H

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.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()

// TODO Cross-platform ramdisk path.
#define TMPDIR "/tmp"

#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_DB_ERR         = -88805,
    LSUP_NOT_IMPL_ERR   = -88806,
    LSUP_IO_ERR         = -88807,
    LSUP_MEM_ERR        = -88808,
} LSUP_rc;

typedef enum {
    LSUP_BOOL_UNION,
    LSUP_BOOL_SUBTRACTION,
    LSUP_BOOL_INTERSECTION,
    LSUP_BOOL_XOR,
} LSUP_bool_op;


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];

// Yes, a textbook mistake; but writing min and max for all int types is crazy.
#define min(x, y) (x) < (y) ? (x) : (y)
#define max(x, y) (x) > (y) ? (x) : (y)

/** @brief Make recursive directories.
 *
 * from https://gist.github.com/JonathonReinhart/8c0d90191c38af2dcadb102c4e202950
 */
LSUP_rc mkdir_p(const char *path, mode_t mode);

/** @brief Remove a directory recursively, as in Unix "rm -r".
 *
 * @param path[in] Path of directory to remove.
 */
LSUP_rc
rm_r (const char *path);


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

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

// Return rc if it is of LSUP_rc type and is negative (=error)
#define RCCK(exp) LSUP_rc _rc = (exp); if (_rc < 0) return _rc

// Return NULL if it is of LSUP_rc type and is negative (=error)
#define RCNL(exp) if((exp) < 0) return NULL

#endif