/*
    Scores.cpp
    Dave Klick
    CIS 150
    2017-03-28
    
    Demo of arrays.
*/

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>
using namespace std;

int getInt(string prompt, int min, int max);
void getScores(int ar[], int len);
void display(int ar[], int len);
int getTotal(int ar[], int len);
int min(int ar[], int len);
int max(int ar[], int len);
double average(int ar[], int len);
void writeToFile(string fname, int ar[], int len);
void readFile(string fname);

int main() {
    const int SIZE = 5;
    int score[SIZE];
    int sum;
    string filename("elizabeth.txt");
    
    getScores(score, SIZE);
    display(score, SIZE);
    sum = getTotal(score, SIZE);
    cout << "The sum is " << sum << endl;
    cout << "The highest score is " << max(score, SIZE) << endl;
    cout << "The lowest score is " << min(score, SIZE) << endl;
    cout << "The average score is " << average(score, SIZE) << endl;
    writeToFile(filename, score, SIZE);
    readFile(filename);
    
    return 0;
}

void writeToFile(string fname, int ar[], int len) {
    ofstream ofile(fname.c_str());
    if (!ofile) {
        cout << "Error opening file " << fname << " for output\n";
        exit(EXIT_FAILURE);
    }
    for (int i=0; i<len; i++) {
        ofile << ar[i] << '\n';
    }
    ofile.close();
}

void readFile(string fname) {
    int num;
    ifstream ifile(fname.c_str());
    if (!ifile) {
        cout << "Error opening file " << fname << " for input\n";
        exit(EXIT_FAILURE);
    }
    while (ifile >> num) {
        cout << num << " ";
    }
    cout << endl;
    ifile.close();
}

void getScores(int ar[], int len) {
    for (int i=0; i<len; i++) {
        ar[i] = getInt("Enter score ", 0, 30);
    }
}

void display(int ar[], int len) {
    for (int i=0; i<len; i++) {
        cout << ar[i] << " ";
    }
    cout << endl;
}

int getTotal(int ar[], int len) {
    int sum = 0;
    for (int i=0; i<len; i++) {
        sum = sum + ar[i];
    }
    return sum;
}

int min(int ar[], int len) {
    int smallest = ar[0];
    for (int i=1; i<len; i++) {
        if (ar[i] < smallest) smallest = ar[i];
    }
    return smallest;
}

int max(int ar[], int len) {
    int largest = ar[0];
    for (int i=1; i<len; i++) {
        if (ar[i] > largest) largest = ar[i];
    }
    return largest;
}

double average(int ar[], int len) {
    return (double) getTotal(ar, len) / len;
}

int getInt(string prompt, int min, int max) {
    int val;
    bool valid = false;
    while (!valid) {  // Keep looping while we do not have valid input
        cout << prompt << "(" << min << "-" << max << "): ";
        cin >> val;
        if (!cin) {  // This is true if the wrong data type was entered
            cout << "Invalid integer\n";
            cin.clear();              // Clears the input error condition
            cin.ignore(10000, '\n');  // Clears the input buffer
        } else {
            // The rest of this is normal data validation
            if (val < min) cout << "Error: Below minimum of " << min << '\n';
            else if (val > max) cout << "Error: Above maximum of " << max << '\n';
            else valid = true;  // Input was valid, so set flag to stop loop
        }
    }
    return val;
}