#include "MemoryInfo.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
MemoryInfo* MemoryInfo::m_pInstance=nullptr;
MemoryInfo::Garbo MemoryInfo::garbo;

MemoryInfo::MemoryInfo(/* args */)
{
}

// MemoryInfo::~MemoryInfo()
// {

// }

MemoryInfo* MemoryInfo::GetInstance()
{
    if(m_pInstance==nullptr)
    {
        m_pInstance= new MemoryInfo();
    }
    return m_pInstance;
}
float MemoryInfo::GetMemoryUsed()
{
    float ret=0.0f;
    Mem_info info;
    getMemInfo(info);
    if(info.total!=0)
        ret=(100.0 * (info.total - info.available) / info.total);
    return ret;
}

void MemoryInfo::getMemInfo(Mem_info& info)
{
    FILE* fpMemInfo = fopen("/proc/meminfo", "r");
    if (NULL == fpMemInfo)
    {
        return ;
    }
    int i = 0;
    int value;
    char name[1024];
    char line[1024];
    int nFiledNumber = 2;
    int nMemberNumber = 5;
    while (fgets(line, sizeof(line) - 1, fpMemInfo))
    {
        if (sscanf(line, "%s%u", name, &value) != nFiledNumber)
        {
            continue;
        }
        if (0 == strcmp(name, "MemTotal:"))
        {
            ++i;
            info.total = value;
        }
        else if (0 == strcmp(name, "MemFree:"))
        {
            ++i;
            info.free = value;
        }
        else if (0 == strcmp(name, "MemAvailable:"))
        {
            ++i;
            info.available = value;
        }
        else if (0 == strcmp(name, "Buffers:"))
        {
            ++i;
            info.buffers = value;
        }
        else if (0 == strcmp(name, "Cached:"))
        {
            ++i;
            info.cached = value;
        }
        if (i == nMemberNumber)
        {
            break;
        }
    }
    fclose(fpMemInfo);
}