////////////////////////////////////////////////////////////////////////////////
// Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
// Unauthorized copying of this file, via any medium is strictly prohibited.
// Proprietary and confidential.
////////////////////////////////////////////////////////////////////////////////
#include "CommonUtil.h"
#include "utils/Log.h"

#include <unistd.h>
#include <sys/sysinfo.h>
#include <pwd.h>
#include <thread>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>
#include <iostream>

#include "boost/filesystem.hpp"

#if defined(__x86_64__)
#define THREAD_MULTIPLY_CPU 1
#elif defined(__powerpc64__)
#define THREAD_MULTIPLY_CPU 4
#else
#define THREAD_MULTIPLY_CPU 1
#endif

namespace zilliz {
namespace vecwise {
namespace server {

namespace fs = boost::filesystem;

bool CommonUtil::GetSystemMemInfo(unsigned long &totalMem, unsigned long &freeMem) {
    struct sysinfo info;
    int ret = sysinfo(&info);
    totalMem = info.totalram;
    freeMem = info.freeram;

    return ret == 0;//succeed 0, failed -1
}

bool CommonUtil::GetSystemAvailableThreads(unsigned int &threadCnt) {
    //threadCnt = std::thread::hardware_concurrency();
    threadCnt = sysconf(_SC_NPROCESSORS_CONF);
    threadCnt *= THREAD_MULTIPLY_CPU;
    if (threadCnt == 0)
        threadCnt = 8;

    return true;
}

bool CommonUtil::IsDirectoryExit(const std::string &path)
{
    DIR *dp = nullptr;
    if ((dp = opendir(path.c_str())) == nullptr) {
        return false;
    }

    closedir(dp);
    return true;
}

ServerError CommonUtil::CreateDirectory(const std::string &path) {
    struct stat directoryStat;
    int statOK = stat(path.c_str(), &directoryStat);
    if (statOK == 0) {
        return SERVER_SUCCESS;//already exist
    }

    fs::path fs_path(path);
    fs::path parent_path = fs_path.parent_path();
    ServerError err = CreateDirectory(parent_path.string());
    if(err != SERVER_SUCCESS){
        return err;
    }

    statOK = stat(path.c_str(), &directoryStat);
    if (statOK == 0) {
        return SERVER_SUCCESS;//already exist
    }

    int makeOK = mkdir(path.c_str(), S_IRWXU|S_IRGRP|S_IROTH);
    if (makeOK != 0) {
        return SERVER_UNEXPECTED_ERROR;
    }

    return SERVER_SUCCESS;
}

namespace {
    void RemoveDirectory(const std::string &path) {
        DIR *pDir = NULL;
        struct dirent *dmsg;
        char szFileName[256];
        char szFolderName[256];

        strcpy(szFolderName, path.c_str());
        strcat(szFolderName, "/%s");
        if ((pDir = opendir(path.c_str())) != NULL) {
            while ((dmsg = readdir(pDir)) != NULL) {
                if (strcmp(dmsg->d_name, ".") != 0
                    && strcmp(dmsg->d_name, "..") != 0) {
                    sprintf(szFileName, szFolderName, dmsg->d_name);
                    std::string tmp = szFileName;
                    if (tmp.find(".") == std::string::npos) {
                        RemoveDirectory(szFileName);
                    }
                    remove(szFileName);
                }
            }
        }

        if (pDir != NULL) {
            closedir(pDir);
        }
        remove(path.c_str());
    }
}

ServerError CommonUtil::DeleteDirectory(const std::string &path) {
    struct stat directoryStat;
    int statOK = stat(path.c_str(), &directoryStat);
    if (statOK != 0)
        return SERVER_SUCCESS;

    RemoveDirectory(path);
    return SERVER_SUCCESS;
}

bool CommonUtil::IsFileExist(const std::string &path) {
    return (access(path.c_str(), F_OK) == 0);
}

std::string CommonUtil::GetExePath() {
    const size_t buf_len = 1024;
    char buf[buf_len];
    size_t cnt = readlink("/proc/self/exe", buf, buf_len);
    if(cnt < 0|| cnt >= buf_len) {
        return "";
    }

    buf[cnt] = '\0';

    std::string exe_path = buf;
    if(exe_path.rfind('/') != exe_path.length()){
        std::string sub_str = exe_path.substr(0, exe_path.rfind('/'));
        return sub_str + "/";
    }
    return exe_path;
}

void CommonUtil::ConvertTime(int year, int month, int day, int hour, int minute, int second, time_t& t_t) {
    tm t_m;
    t_m.tm_year = year;
    t_m.tm_mon = month;
    t_m.tm_mday = day;
    t_m.tm_hour = hour;
    t_m.tm_min = minute;
    t_m.tm_sec = second;
    t_t = mktime(&t_m);
}

}
}
}