#include "app_ring_buffer.h"

// 큐 초기화
bool RingBuffer_Initialization(RING_BUFFER* pRingbuffer, bool isOverWrite, uint32_t buffer_size, uint8_t* pBuffer)
{
    if(buffer_size == 0 || pRingbuffer == NULL || pBuffer == NULL)
        return false;
    pRingbuffer->pBuffer = pBuffer;
    pRingbuffer->BufferSize = buffer_size;
    pRingbuffer->isOverWrite = isOverWrite;
    pRingbuffer->front = -1;
    pRingbuffer->rear = -1;
    return true;
}

bool RingBuffer_Clear(RING_BUFFER* pRingbuffer)
{
    if(pRingbuffer == NULL || pRingbuffer->BufferSize == 0 || pRingbuffer->pBuffer == NULL)
        return false;
    
    pRingbuffer->front = -1;
    pRingbuffer->rear = -1;
    return true;
}

bool RingBuffer_isEmpty(RING_BUFFER* pRingbuffer)
{
    return (pRingbuffer->front == -1);        
}

bool RingBuffer_isFull(RING_BUFFER* pRingbuffer)
{
    return ((pRingbuffer->front == 0 && pRingbuffer->rear == (pRingbuffer->BufferSize - 1)) || (pRingbuffer->front == (pRingbuffer->rear + 1)));
}
// 큐에 요소를 추가 (enqueue)
bool RingBuffer_Enqueue(RING_BUFFER* pRingbuffer, uint8_t value) 
{
    uint8_t temp;
    if (RingBuffer_isFull(pRingbuffer)) 
    {
        if(pRingbuffer->isOverWrite == false)
            return false;
        else
            RingBuffer_Dequeue(pRingbuffer, &temp);
    }
    
    if (pRingbuffer->front == -1) 
    {
        pRingbuffer->front = 0;
    }
    pRingbuffer->rear = (pRingbuffer->rear + 1) % pRingbuffer->BufferSize;
    pRingbuffer->pBuffer[pRingbuffer->rear] = value;
    return true;
    
}

// 큐에서 요소를 제거하고 반환 (dequeue)
bool RingBuffer_Dequeue(RING_BUFFER* pRingbuffer, uint8_t* pRetValue)  
{    
    if (RingBuffer_isEmpty(pRingbuffer)) 
    {        
        return false;        
    } 
    else 
    {
        *pRetValue = pRingbuffer->pBuffer[pRingbuffer->front];
        if (pRingbuffer->front == pRingbuffer->rear) 
        {
            pRingbuffer->front = -1;
            pRingbuffer->rear = -1;
        } 
        else 
        {
            pRingbuffer->front = (pRingbuffer->front + 1) % pRingbuffer->BufferSize;
        }
        return true;
    }
}

bool RingBuffer_GetData(RING_BUFFER* pRingbuffer, uint8_t* pRetValue)  
{
    *pRetValue = pRingbuffer->pBuffer[pRingbuffer->front];
    return true;
}

bool RingBuffer_PopData(RING_BUFFER* pRingbuffer)  
{
    if (pRingbuffer->front == pRingbuffer->rear) 
    {
        pRingbuffer->front = -1;
        pRingbuffer->rear = -1;
    } 
    else 
    {
        pRingbuffer->front = (pRingbuffer->front + 1) % pRingbuffer->BufferSize;
    }
    return true;
}

uint32_t RingBuffer_Get_DataSize(RING_BUFFER* pRingbuffer) 
{
    if (RingBuffer_isEmpty(pRingbuffer)) 
    {
        return 0;
    } 
    else if (pRingbuffer->front <= pRingbuffer->rear) 
    {
        return (pRingbuffer->rear - pRingbuffer->front + 1);
    } 
    else 
    {
        return (pRingbuffer->BufferSize - pRingbuffer->front + pRingbuffer->rear + 1);
    }
}