// miserable.cpp

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;

int main(){
    int keepGoing = 1, noOfTempValues = 24;
    double tempValue, averageValue, totalValue, max, min;
    char userChoice;
    string fileName = "templog.txt";    //file name
    ifstream inputFile(fileName);   //Opening the file.
    //if opened the file then the program will run
    if (inputFile){
        cout << "\n\nTemperature Statistics\n----------------------\n\nReading logged values for processing and presentation...\n\nPress Enter for menu: ";
        cin.get();  //waiting user to enter input

        while (keepGoing){
            system("cls");
            cout << "\n\nMENU\n----\n\n1. Display temperature values\n2. View maximum and minimum temperatures\n3. View average temperature\n4. Quit\n\nMake your choice: ";
            cin.get(userChoice);
            cin.get();
            if (userChoice == '1'){
                cout << "\nDisplaying the latest 24 temperature values:\n\n";
                for (int i = 0; i < noOfTempValues; i++){
                    if (i % 6 == 0)
                        cout << endl;
                    inputFile >> tempValue;
                    cout << fixed << setprecision(2) << setw(8) << tempValue;
                }
            }

            else if (userChoice == '2'){
                cout << "\nCalculating the maximum and minimum temperature...\n";
                max = 0, min = 0;
                inputFile >> tempValue;
                max = min = tempValue;
                for (int i = 1; i<noOfTempValues; i++){
                    inputFile >> tempValue;
                    if (tempValue>max)
                        max = tempValue;
                    if (tempValue < min)
                        min = tempValue;
                }
                cout << "\nMaximum temperature: " << fixed << setprecision(2) << max << " degrees Celcius\n";
                cout << "\nMinimum temperature: " << min << " degrees Celcius\n";
            }

            else if (userChoice == '3'){
                cout << "\nCalculating average temperature...\n";
                totalValue = 0.0;
                for (int i = 0; i < noOfTempValues; i++){
                    inputFile >> tempValue;
                    totalValue += tempValue;
                }
                averageValue = totalValue / 24;
                cout << "\nAverage temperature: ";
                cout << fixed << setprecision(2) << averageValue << " degrees Celcius\n";
            }

            else{
                keepGoing = 0;
                cout << "\n\nTerminating the program.";
            }
            cout << "\n\nPress Enter to continue:";
            cin.get();
            //this line to start reading from the beginning of the file.
            inputFile.clear();
            inputFile.seekg(0, ios::beg);
        }
        inputFile.close();
    }
    //if the file didn't open
    else
        cerr << "File could not be opened!\n"; // Report error
    return 0;
}