#ifndef LSM
#define LSM

#include <stdint.h>

#define LSM_MAX_SKIP_SIZE 8

typedef enum lsm_error {
   lsm_error_ok = 0,
   lsm_error_failed_alloc = 1,
   lsm_error_not_found = 2,
   lsm_error_already_present = 3
} lsm_error;

/**
 * Represents a string (or really any kind of data) with a known length. Data
 * with length 8 or less is stored inside the pointer, and does not allocate
 * additional memory.
 */
typedef struct lsm_string {
  uint64_t len;
  union {
    void *ptr;
    char val[8];
  } str;
} lsm_string;

/**
 * The type of an attribute. Each type is represented as a single bit of a
 * 32-bit integer, so they can be easily combined into a bitmap.
 */
typedef enum lsm_attr_type {
  lsm_attr_type_entry_type = 1 << 0
} lsm_attr_type;

/**
 * A single attribute associated with an entry
 */
typedef struct lsm_attr {
  lsm_attr_type type;
  lsm_string str;
} lsm_attr;

/**
 * Represents a collection of attributes for an entry. A collection can only
 * contain one of each attribute.
 */
typedef struct lsm_attr_list {
  uint64_t count;
  lsm_attr *items;
  uint32_t bitmap;
} lsm_attr_list;

/**
 * An entry inside an LSM store
 */
typedef struct lsm_entry {
  lsm_string key;
  lsm_attr_list attrs;
  lsm_string data;
} lsm_entry;

/**
 * A store of entries, which manages its data both in-memory and on disk.
 */
typedef struct lsm_store lsm_store;

#endif