#include <algorithm>
#include <chrono>
#include <fstream>
#include <iostream>
#include <string>
#include <thread>

int main(int argc, char **argv) {

    if (argc != 3) {
        std::cerr << "Error incorrect arguments." << std::endl;
        std::cout << "Use: input_tex_file.txt delay" << std::endl;
        return EXIT_FAILURE;
    }

    unsigned int milli = std::stoi(argv[2]);
    if (milli == 0) {
        std::cerr << "Invalid delay\n";
        return EXIT_FAILURE;
    }

    std::fstream file;
    file.open(argv[1], std::ios::in);
    if (!file.is_open()) {
        std::cerr << "Error open file: " << argv[1] << std::endl;
        return EXIT_FAILURE;
    }

    std::vector<std::string> data;
    std::string line;
    while (std::getline(file, line)) {
        data.push_back(line);
    }
    file.close();
    int index = 0;

    while (1) {
        std::string line = data[index];
        for (std::string::size_type i = 0; i < line.length(); ++i) {
            std::cout << line[i];
            fflush(stdout);
            std::this_thread::sleep_for(std::chrono::milliseconds(milli));
        }
        std::cout << std::endl;
        if (index < data.size() - 1)
            index++;
        else
            index = 0;
    }

    return 0;
}