#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

//global variable allowed once here
string months[12] = {"January", "February", "March", "April", "May", "June",
                     "July", "August", "September", "October", "November", "December"};

//function prototypes. Some of these have arrays denoted by []
void getData(double[], int);
double totalRainfall(double [], int);
double averageRainfall(double [], int);
int driestMonth(double [], int);
int wettestMonth(double [], int);

void displayReport(double,int, double, int, int, double[]);





int main()
{
    const int SIZE = 12;
    double rainfall[SIZE];
    //call function getData
    getData(rainfall, SIZE);

    double totalRain = totalRainfall(rainfall, SIZE);
    double avgRain = averageRainfall(rainfall, SIZE);

    int lowRain = driestMonth(rainfall, SIZE);
    int highRain = wettestMonth(rainfall, SIZE);

    displayReport(totalRain, SIZE, avgRain, lowRain, highRain, rainfall);

    return 0;
}


void getData(double rainfall[], int SIZE)
{

    double rainInput;

    cout << "Please enter the total rainfall for all twelve months. \n";
    for (int i=0; i< SIZE; i++)
    {
        do
        {
            cout << months[i] << ": ";
            cin >> rainInput;

            if (rainInput<0)
                cout << "Error. Please enter a rainfall amount greater than zero. \n";

        }
        while (rainInput < 0);

        rainfall[i] = rainInput;
    }

}


double totalRainfall(double rainfall[], int SIZE)
{
    double total = 0;

    for (int i = 0; i < SIZE; i++)
    {
        total += rainfall[i];
    }

    return total;
}


double averageRainfall(double rainfall[], int SIZE)
{
    return totalRainfall(rainfall, SIZE) / SIZE;

}

int driestMonth(double rainfall[], int SIZE)
{
    //set the first month as the driest month.
    double driest = rainfall[0];
    int lowRain;

    //compare the first number to the other numbers in the array
    //if another number is lower than the current month
    //it will use that month instead.
    for (int i=0; i<SIZE; i++)
    {
        if(rainfall[i] < driest)
        {
            driest = rainfall[i];
            lowRain = i;
        }
    }
    return lowRain;

}

int wettestMonth(double rainfall[], int SIZE)
{
    double wettest = rainfall[0];
    int highRain;

    for (int i = 0; i < SIZE; i++)
    {
        if (rainfall[i] > wettest)
        {
            wettest = rainfall[i];
            highRain = i;
        }
    }
    return highRain;
}

 void displayReport(double totalRain, int SIZE, double avgRain, int lowRain, int highRain, double rainfall[])
{

    cout << "\n 2015 Rain Report for Neversnows County \n";
    cout << fixed << showpoint << setprecision(2);
    cout << "Total rainfall: " << totalRain <<" inches \n";
    cout << "Average monthly rainfall: " << avgRain << " inches \n";
    cout << "The least rain fell in " << months[lowRain] << " with "  << rainfall[lowRain] << " inches. \n";
    cout << "The most rain fell in " << months[highRain] << " with "  << rainfall[highRain] << " inches. \n";

}