main.cpp

#include "calculations.h"
#include <iostream>
#include <limits>
#include <string>
#include <sstream>
#include <algorithm> // Include this header for std::replace
#include <iomanip>   // Include this header for std::fixed and std::setprecision RS74

void clearInput() {
    std::cin.clear();
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}

double getValidatedInput(const std::string& prompt) {
    std::string input;
    double value;
    while (true) {
        std::cout << prompt;
        std::cin >> input;
        std::replace(input.begin(), input.end(), ',', '.');
        std::stringstream ss(input);
        if (ss >> value && value > 0) {
            return value;
        } else {
            std::cout << "Invalid input. Please enter a positive number.\n\n";
            clearInput();
        }
    }
}

double getTimeInput() {
    int hours, minutes;
    while (true) {
        std::cout << "Enter time (hours and minutes, separated by space): ";
        std::cin >> hours >> minutes;
        if (std::cin.fail() || hours < 0 || minutes < 0 || minutes >= 60) {
            std::cout << "Invalid input. Please enter valid hours and minutes.\n\n";
            clearInput();
        } else {
            return hours + minutes / 60.0;
        }
    }
}

void displayTime(double time) {
    int hours = static_cast<int>(time);
    int minutes = static_cast<int>((time - hours) * 60);
    std::cout << "\nTime: " << hours << " hours and " << minutes << " minutes\n\n";
}

int main() {
    double speed, distance, time;
    int choice;

    while (true) {
        std::cout << "* * * Choose the calculation you want to perform: * * *\n\n";
        std::cout << "1. Calculate required speed (knots)\n\n";
        std::cout << "2. Calculate distance (nautical miles)\n\n";
        std::cout << "3. Calculate time (hours and minutes)\n\n";
        std::cout << "4. Exit\n\n";
        std::cin >> choice;

        if (std::cin.fail() || choice < 1 || choice > 4) {
            std::cout << "Invalid choice. Enter a number between 1 and 4.\n";
            clearInput();
            continue;
        }

        if (choice == 4) {
            break;
        }

        switch (choice) {
            case 1:
                distance = getValidatedInput("Enter distance (nautical miles): ");
                time = getTimeInput();
                speed = calculateSpeed(distance, time);
                std::cout << std::fixed << std::setprecision(2);
                std::cout << "\nSpeed: " << speed << " knots\n\n";
                break;
            case 2:
                speed = getValidatedInput("Enter speed (knots): ");
                time = getTimeInput();
                distance = calculateDistance(speed, time);
                std::cout << std::fixed << std::setprecision(2);
                std::cout << "\nDistance: " << distance << " nautical miles\n\n";
                break;
            case 3:
                distance = getValidatedInput("Enter distance (nautical miles): ");
                speed = getValidatedInput("\nEnter speed (knots): ");
                time = calculateTime(distance, speed);
                displayTime(time);
                break;
        }
    }

    return 0;
}