#ifndef INCLUDED_C_LINKDQUEUE_H
#define INCLUDED_C_LINKDQUEUE_H

#ifndef INCLUDED_C_TYPES_H
#include <c_Types.h>
#endif /*INCLUDED_C_TYPES_H*/


/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

typedef struct c_LinkDQueueNode_t {
    void* data;
    struct c_LinkDQueueNode_t* prev;
    struct c_LinkDQueueNode_t* next;
} c_LinkDQueueNode_t;

// 雙端佇列控制結構
typedef struct {
    c_LinkDQueueNode_t* head;
    c_LinkDQueueNode_t* tail;
    int obj_size;
    c_size_t size;
} c_LinkDQueue_t;

// 雙端佇列迭代器（維持指標的指標設計，預設從 head 往 tail 走訪）
typedef struct {
    c_LinkDQueue_t* dqueue;
    c_LinkDQueueNode_t** node;
} c_LinkDQueueIter_t;

// 核心函數宣告
c_err_t c_LinkDQueue_Init(c_LinkDQueue_t* self, int obj_size);
void c_LinkDQueue_Destroy(c_LinkDQueue_t* self);

c_err_t c_LinkDQueue_PushHead(c_LinkDQueue_t* self, void* obj);
c_err_t c_LinkDQueue_PushTail(c_LinkDQueue_t* self, void* obj);

c_err_t c_LinkDQueue_PopHead(c_LinkDQueue_t* self, void* obj);
c_err_t c_LinkDQueue_PopTail(c_LinkDQueue_t* self, void* obj);

void* c_LinkDQueue_PeekHead(c_LinkDQueue_t* self);
void* c_LinkDQueue_PeekTail(c_LinkDQueue_t* self);

void c_LinkDQueueIter_Remove(c_LinkDQueueIter_t* self);

// 迭代器內聯函數
C_STATIC_FORCE_INLINE
void c_LinkDQueueIter_Init(c_LinkDQueueIter_t* self, c_LinkDQueue_t* dqueue) {
    if (!self || !dqueue) return;
    self->dqueue = dqueue;
    self->node = &dqueue->head;
}

C_STATIC_FORCE_INLINE
c_bool_t c_LinkDQueueIter_HasNext(c_LinkDQueueIter_t* self) {
    if (!self) return C_FALSE;
    return (self->node != NULL) && (*(self->node) != NULL);
}

C_STATIC_FORCE_INLINE
void* c_LinkDQueueIter_Next(c_LinkDQueueIter_t* self) {
    if (!self || !self->node || !*(self->node)) return NULL;
    void* data = (*(self->node))->data;
    self->node = &(*(self->node))->next;
    return data;
}

C_STATIC_FORCE_INLINE
void* c_LinkDQueueIter_Get(c_LinkDQueueIter_t* self) {
    if (!self || !self->node || !*(self->node)) return NULL;
    return (*(self->node))->data;
}

void c_LinkDQueueIter_Remove(c_LinkDQueueIter_t* self);

#endif /*INCLUDED_C_LINKDQUEUE_H*/