#pragma once

#include <iostream>

#include <stdarg.h>
#include <ctime>

#include<sys/types.h>
#include<sys/stat.h>
#include<sys/fcntl.h>
#include<unistd.h>

#define Info 0
#define Debug 1
#define Warning 2
#define Error 3
#define Fatal 4

#define SIZE 1024
#define Screen 1
#define Onefile 2
#define Classfile 3
#define LogFile "log.txt"

class Log
{
public:
    Log()
    {
        printMethod = Screen;
        path = "./log/";
    }

    void Enable(int method)
    {
        printMethod = method;
    }

    std::string levelToString(int level)
    {
        switch(level)
        {
            case Info:
                return "Info";
            case Debug:
                return "Debug";
            case Warning:
                return "Warning";
            case Error:
                return "Error";
            case Fatal:
                return "Fatal";
            default:
                return "None";
        }
    }

    void printLog(int level, std::string logtxt)
    {
        switch(printMethod)
        {
            case Screen: 
                std::cout << logtxt;   
                break;
            case Onefile:
                printOnefile(LogFile, logtxt);
                break;
            case Classfile:
                printClassfile(level, logtxt);
                break;
            default:
            break;    
        }
    }

    void printOnefile(const std::string &logName, const std::string &logtxt)
    {
        std::string _logName = path + logtxt;
        int fd = open(_logName.c_str(), O_CREAT | O_WRONLY | O_APPEND, 0666);
        if(fd < 0)  return;
        write(fd,logtxt.c_str(),logtxt.size());
        close(fd);
    }

    void printClassfile(int level, std::string logtxt)
    {
        std::string fileNmae = LogFile;
        fileNmae += ".";
        fileNmae += levelToString(level);
        printOnefile(fileNmae,logtxt);
    }

    void operator()(int level, const char *format, ...) // 可变参数
    {
        time_t t = time(nullptr);
        struct tm *ctime = localtime(&t);
        char leftbuffer[SIZE] = {0};
        snprintf(leftbuffer, sizeof(leftbuffer), "[%s][%d-%d-%d-%d:%d:%d]",levelToString(level).c_str(),
            ctime->tm_year+1900,ctime->tm_mon+1,ctime->tm_mday,
            ctime->tm_hour,ctime->tm_min,ctime->tm_sec);

        va_list s;
        va_start(s,format);
        char rightbuffer[SIZE]={0};
        vsnprintf(rightbuffer,sizeof(rightbuffer),format,s);
        va_end(s);

        //日志格式：默认+自定义部分
        char logtxt[SIZE]={0};
        snprintf(logtxt,sizeof(logtxt),"%s %s\n",leftbuffer,rightbuffer);
        //std::cout << logtxt << std::endl;
        printLog(level,logtxt);
        // std::cout << time(nullptr) << std::endl;
    }

    ~Log()
    {}

private:
    int printMethod;
    std::string path;
};


//////////////////////////////////////////////////////
/*  形参从右向左入栈
    n最后入栈实例化
    可变参数列表必须要有一个实参，用于找到起始地址
    栈 自顶向下 高地址 --> 低地址
*/
//////////////////////////////////////////////////////
// n代表有几个值
void sum(int n, ...)
{
    va_list s; // char*
    va_start(s, n);

    int sum = 0;
    while (n)
    {
        sum += va_arg(s, int);
        n--;
    }

    va_end(s); // s = nullptr
}