/**
 * @file deque.h
 * @author wenjf (Orig5826@163.com)
 * @brief
 * @version 0.1
 * @date 2024-06-23
 *
 * @copyright Copyright (c) 2024
 *
 */
#ifndef _DEQUE_H_
#define _DEQUE_H_

#include "unicstl_internal.h"
#include "ringbuf.h"
#include "segarray.h"

// 0.rinfbuf   1.segarray
#define DEQUE_DEFAULT_SELECT    0

#if DEQUE_DEFAULT_SELECT == 1
#define DEQUE_RINGBUF   0
#define DEQUE_SEGARRAY  1
#else
#define DEQUE_RINGBUF   1
#define DEQUE_SEGARRAY  0
#endif

#if DEQUE_RINGBUF && DEQUE_SEGARRAY
#error "Cannot enable both DEQUE_RINGBUF and DEQUE_SEGARRAY at the same time."
#endif
#if !(DEQUE_RINGBUF || DEQUE_SEGARRAY)
#error "You must enable at least one backend: DEQUE_RINGBUF or DEQUE_SEGARRAY."
#endif

struct _deque
{
    // -------------------- private -------------------- 
    union 
    {
        ringbuf_t ringbuf;
        segarray_t _segarray;
    };
    iterator_t _iter_ptr;
    
    struct _iterator _iter;
    void (*_destory)(struct _deque* self);

    // -------------------- public -------------------- 
    // kernel
    bool (*push_back)(struct _deque* self, void* obj);
    bool (*push_front)(struct _deque* self, void* obj);
    bool (*pop_back)(struct _deque* self, void* obj);
    bool (*pop_front)(struct _deque* self, void* obj);
    bool (*back)(struct _deque* self, void* obj);
    bool (*front)(struct _deque* self, void* obj);
    
    // base
    bool (*reserve)(struct _deque* self, size_t capacity);
    size_t (*size)(struct _deque* self);
    size_t (*capacity)(struct _deque* self);
    bool (*clear)(struct _deque* self);
    bool (*empty)(struct _deque* self);
    bool (*full)(struct _deque* self);

    // iter
    iterator_t (*iter)(struct _deque* self, linear_order_t order);

    // -------------------- debug -------------------- 
    void (*print)(struct _deque* self);
    void (*print_obj)(const void* obj);
};
typedef struct _deque* deque_t;

deque_t deque_new(size_t obj_size, size_t capacity);
void deque_free(deque_t* deque);

#endif