#include <iostream>
#include <fstream>
#include <string>
#include <time.h>

std::string getFilePath();
size_t findBiggestNum(std::ifstream&);

int main() {
    double timeS = clock();

    std::ifstream inputFileS;
    while (true) {
        std::string inputFilePath = getFilePath();
        inputFileS.open(inputFilePath, std::ios_base::in);
        if (inputFileS.fail())
            inputFilePath.clear();
        else
            break;
    }

    std::cout << "The biggest num in file is: " << findBiggestNum(inputFileS) << std::endl;

    double timeE = clock();
    std::cout << "Time: " << (timeE - timeS) / (1000 * CLOCKS_PER_SEC) << std::endl;
    system("pause");
    return 0;
}

std::string getFilePath() {
    std::string filePath = "";
    std::cout << "\nEnter the path to the input file or its name: ";
    std::cin.clear();
    getline(std::cin, filePath);
    //if file path is empty -> save the output to the out.txt in the root folder
    std::string rootFolder = "D:/Studying/Programming/LABS/Labka 2.5 v.1/Labka 2.5 v.1/";
    if (filePath.empty())
        filePath = rootFolder + "out.txt";
    //if user didn't provided full adress -> create a new file in the root folder
    else if (filePath.find('\\') == std::string::npos and filePath.find('/') == std::string::npos)
        filePath.insert(0, rootFolder); // prepend address of the root folder
    filePath.append(".txt"); // append extension of a text file
    return filePath;
}

size_t findBiggestNum(std::ifstream& ifs) {
    size_t biggestNum = 0;
    size_t checkVal = 0;
    while (ifs.peek() != std::ifstream::traits_type::eof()) {
        ifs >> checkVal;
        if (checkVal > biggestNum)
            biggestNum = checkVal;
    }
    return biggestNum;
}