//
// clist.h
//
// Copyright (c) 2010 TJ Holowaychuk <tj@vision-media.ca>
//

#ifndef __CLIST_H__
#define __CLIST_H__

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdlib.h>
#include <stdint.h>

  /*
   * clist_t iterator direction.
   */

  typedef enum
  {
    LIST_HEAD,
    LIST_TAIL
  } clist_direction_t;

  /*
   * clist_t node struct.
   */

  typedef struct clist_node
  {
    struct clist_node *prev;
    struct clist_node *next;
    void *val;
  } clist_node_t;

  /*
   * clist_t struct.
   */

  typedef struct
  {
    clist_node_t *head;
    clist_node_t *tail;
    uint32_t len;
    void (*free)(void *val);
    int8_t (*compare)(void *a, void *b);
  } clist_t;

  /*
   * clist_t iterator struct.
   */

  typedef struct
  {
    clist_node_t *next;
    clist_direction_t direction;
  } clist_iterator_t;

  // Node prototypes.

  clist_node_t *
  clist_node_new(void *val);

  // clist_t prototypes.

  clist_t *
  clist_new(void);

  clist_node_t *
  clist_rpush(clist_t *self, clist_node_t *node);

  clist_node_t *
  clist_lpush(clist_t *self, clist_node_t *node);

  clist_node_t *
  clist_find(clist_t *self, void *val);

  clist_node_t *
  clist_at(clist_t *self, int index);

  clist_node_t *
  clist_rpop(clist_t *self);

  clist_node_t *
  clist_lpop(clist_t *self);

  void
  clist_remove(clist_t *self, clist_node_t *node);

  void
  clist_clear(clist_t *self);

  void
  clist_destroy(clist_t *self);

  // clist_t iterator prototypes.

  clist_iterator_t *
  clist_iterator_new(clist_t *list, clist_direction_t direction);

  clist_iterator_t *
  clist_iterator_new_from_node(clist_node_t *node, clist_direction_t direction);

  clist_node_t *
  clist_iterator_next(clist_iterator_t *self);

  void
  clist_iterator_destroy(clist_iterator_t *self);

#ifdef __cplusplus
}
#endif

#endif /* __CLIBS_LIST_H__ */