// Wyatt Vandenburg
// Paintingco.cpp
// the following code takes in the the size of a painting job and calculates the size of job, how many paint cans it
// will take and the cost, next the program takes an inputed numeric date and calculates the day of the week, and
// the calculates the correct month while considering if there is a leap year or not
// Xcode

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

void displayTitle();
void getData(int &length, int &width);
char convert12Format(int &hour);
int calcSqMeter(int length, int width);
int calcTotalCans(int area);
double calcCost(int cans);
void displayResults(int area, int cans, double cost);
bool isLeapYear(int year);
int getYearValue(int year);
int getMonthNumber(string month);
int getMonthVa0lue(int m, int year);
int dayOfWeek(int day, int month, int year);
void displayMsg(int cans);

int main()
{
    int length, width, hour, minute, day, month, year;
    string weekDay[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    string monthsInYear[] = {"January", "Feburary", "March","April", "May", "June", "July", "August", "September", "November", "Decemeber"};
//
    displayTitle();
    getData(length, width);
       
    while (length != 0) {
        cout << "  Enter the transaction time in 24-hour notation: " <<endl;
        cout<<"  Hour: ";
        cin >> hour;
        cout<<"  Minute: ";
        cin >> minute;
        cout << "  Enter the transaction date (dd mm yyyy): ";
        cin >> day >>  month >> year;

        int area = calcSqMeter(length, width);
        int cans = calcTotalCans(area);
        double cost = calcCost(cans);
        displayResults(area, cans, cost);
        
        int idx = dayOfWeek(day, month, year);
   
        char ampm = convert12Format(hour);
        cout << "\n\tDate/Time: " << weekDay[idx] <<", " << monthsInYear[month -1] << " " << day << ", " << year
             << " " << hour << ":" << minute;
        if(ampm == 'P')
            cout<<"PM" << endl;
        else
            cout <<"AM"<<endl;
        displayMsg(cans);

        cout <<"\tThank you for your purchase.\n "<<endl;
        cout <<"========================================================="<<endl;
        getData(length, width);
    }
}


void displayTitle()
{
    cout<<"\t\tRainbow Printing Company Paint Costing"<<endl;
    cout<<"\t-----------------------------------------------"<<endl;

}
// uses call by reference
void getData(int &length, int &width)
{
    cout<<"\n  Enter the length in meter (0 to stop).....";
    cin >> length;
    if(length == 0)
        return;
    cout<<"  Enter the width in meter....................";
    cin >> width;
}

// this method converts  24 hour period into a 12 hour also is using call by reference
char convert12Format(int &hour)
{
    if(hour > 12)
    {
        hour = hour - 12;
        return 'P';
    }
    return 'A';
}

//function receives the values for length and width, and
int calcSqMeter(int length, int width)
{
    int height = 3;
    return length * width + 2 * height * (length + width);
}

//function calculates and returns the # of cans
int calcTotalCans(int area)
{
    int coverArea = 20;
    int cans =  ceil((double)area/coverArea); // ceil will round the value up
    return cans;
}

//function calculates and returns the total cost
double calcCost(int cans)
{
    double price = 15.50;
    return cans * price;
}
// method displays numeric values and makes sure that the cost is set to two decimal places
void displayResults(int area, int cans, double cost)
{
    cout << "\n--------------------------------------------------------------------------"<<endl;
    cout << "\tArea\t\t=\t\t" << area << " Square meters"<<endl;
    cout << "\tCans\t\t=\t\t" << cans << endl;
    cout<<fixed <<setprecision(2);
    cout << "\tCost\t\t=\t\t" << cost << endl;
}

// the year must be divisble by 400 OR be divisible by 4 AND is NOT divisible by 100
bool isLeapYear(int year)
{
    
    if(!(year%4 && year%100)||year%400)
        return false; // if the above conditiion is met it is true otherwise the statement is false, and the year is not a leap year.
else
    return true;
}

//function computes a value based on the years since the beginning of the century
int getYearValue(int year)
{
    int remainder;
    remainder = year%100;
    int num;
    num= remainder / 4;
    
    return remainder + num;
}

//function returns a month number based on a 3 charater month name
 int getMonthNumber(int m)
{
     switch(m)
        {
         case 1:
                cout << ("January\n");
                break;
         case 2:
                cout << ("February\n");
                break;
         case 3:
                cout << ("March\n");
                break;
         case 4:
                cout << ("April\n");
                break;
         case 5:
                cout << ("May\n");
                break;
         case 6:
                cout << ("June\n");
                break;
         case 7:
                cout << ("July\n");
                break;
         case 8:
                cout << ("August\n");
                break;
         case 9:
                cout << ("September\n");
                break;
         case 10:
                cout << ("October\n");
                break;
         case 11:
                cout << ("November\n");
                break;
         case 12:
                cout << ("December\n");
                break;
         default:
                cout << ("invalid Month number. \nPlease try again ....\n");
                break;
        }return m;}
//function uses the values in the textbook and envokes the isLeapYear function
int getMonthVa0lue(int month, int year)
{
    
    const int modifier[] = {
     0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5
    };
    if (month > 12 || month < 1)
     return -1;
    else if (month > 2 || !isLeapYear(year))
     return modifier[month - 1];
    else
     return (modifier[month - 1] + 6) % 7;
    }


//function returns the day of the week of the specified date as an int (Sunday = 0, Monday = 1, etc.)
int dayOfWeek(int d, int m, int y)
{
    static int t[] = { 0, 3, 2, 5, 0, 3,
                           5, 1, 4, 6, 2, 4 };
        y -= m < 3;
        return ( y + y / 4 - y / 100 +
                 y / 400 + t[m - 1] + d) % 7;
}

// this fucntion will give the customer a free gift depending on the amount of cans they purchcase
void displayMsg(int cans)
{
    if(cans>1 && cans<4)
        cout<<"Gift: free paint brush\n "<<endl;
    else if(cans < 8)
        cout<<"Gift: Free paint tray\n"<<endl;
    else
        cout<<"Gift: $10 gift card\n"<<endl;
}