#include<iostream>
#include<string>
#include<sys/types.h>
#include<unistd.h>
#include<stdio.h>
#include<cstdarg>
#include<time.h>
using namespace std;


// 日志系统是有等级的

enum 
{
    Debug=0,
    Info,
    Warning,
    Error,
    Fatal,
    Uknown
};

static string toLevelString(int level)
{
    switch (level)
    {
    case Debug:
        return "Debug";
    case Info:
        return "Info";
    case Warning:
        return "Warning";
    case Error:
        return "Error";
    case Fatal:
        return "Fatal";
    default:
        return "Uknown";
    }
}


string getTime()
{
    time_t curr=time(nullptr);
    struct tm*tmp=localtime(&curr);
    char buffer[128];
    snprintf(buffer,sizeof(buffer),"%d-%d-%d %d:%d:%d",tmp->tm_year+1900,tmp->tm_mon+1,tmp->tm_mday,
            tmp->tm_hour,tmp->tm_min,tmp->tm_sec);
    return buffer;
}


// 日志格式: 日志等级 时间 pid 消息体
// logLeft:  日志等级 时间 pid        logRight:  消息体
// logMessage(Debug, "hello: %d, %s",12,s.c_str())   Debug, hello: 12, world

void logMessage(int level, const char*format,...)
{
    char logLeft[1024];
    string level_string=toLevelString(level);
    string curr_time=getTime();
    snprintf(logLeft,sizeof(logLeft),"[%s] [%s] [%d] ",level_string.c_str(),curr_time.c_str(),getpid());

    char logRight[1024];
    va_list p;
    va_start(p,format);
    vsnprintf(logRight,sizeof(logRight),format,p);
    va_end(p);

    printf("%s%s\n",logLeft,logRight);

}