#pragma once
#include <vector>
#include <Windows.h>
#include <io.h>
#include <fstream>
#include <chrono>

class FileTools
{
public:
	
	static std::vector<std::string> getFiles(std::string path)
	{
		std::vector<std::string> files;
		getFiles(path, files);
		return files;
	}

	static void write_log(std::string filepath, std::string log)
	{
		std::ofstream ofs(filepath, std::ios::app);
		ofs << log << std::endl;
	}

private:
	static void getFiles(std::string path, std::vector<std::string>& files)
	{
		//文件句柄  
		long   hFile = 0;
		//文件信息  
		struct _finddata_t fileinfo;
		std::string p;
		if ((hFile = _findfirst(p.assign(path).append("\\*").c_str(), &fileinfo))!=-1)
		{
			do
			{
				//如果是目录,迭代之  
				//如果不是,加入列表  
				if ((fileinfo.attrib &  _A_SUBDIR))
				{
					if (strcmp(fileinfo.name, ".") != 0 && strcmp(fileinfo.name, "..") != 0)
						getFiles(p.assign(path).append("\\").append(fileinfo.name), files);
				}
				else
				{
					files.push_back(p.assign(path).append("\\").append(fileinfo.name));
				}
			} while (_findnext(hFile, &fileinfo) == 0);
			_findclose(hFile);
		}
	}
	
};

class StopWatch
{
public:
	StopWatch() {
		_start = std::chrono::steady_clock::now();
	}

	void reset() {
		_start = std::chrono::steady_clock::now();
	}

	double elapsed_s() {
		return std::chrono::duration<double>(std::chrono::steady_clock::now() - _start).count();
	}

	double elapsed_ms() {
		return std::chrono::duration<double, std::milli>(std::chrono::steady_clock::now() - _start).count();
	}

	double elapsed_us() {
		return std::chrono::duration<double, std::micro>(std::chrono::steady_clock::now() - _start).count();
	}

	double elapsed_ns() {
		return std::chrono::duration<double, std::nano>(std::chrono::steady_clock::now() - _start).count();
	}

private:
	std::chrono::steady_clock::time_point _start;
};