/* This program will get the day the month starts on, and
   the day it ends on, then it will output a calendar.
   Made by Nathan Anderson 4-5-01 Exercise 11

---------------------Algorithm-------------------
set BoxWidth as 8, BoxHeight as 3
Get the starting day
error check
set 'day' to StartDay * -1 + 2
Get amount of days in month
calculate amount of weeks (EndDay + StartDay - 2) / 7
Show days, Sunday through Saturday
output '*' (BoxWidth * 7 + 1) times
do the following 'weeks' times
output '*'
do the following 7 times
if day is smaller than 1, or bigger than 'EndDay', output space
else output day
add 1 to day value
end line
do the following 'BoxHeight' + 1 times
ouput '*'
do the following 7 times
set width to 'BoxWidth'
output '*'
output '*' (BoxWidth * 7 + 1) times
*/

//-------------------Includes--------------------
#include <iostream.h>

//--------------Function Prototypes--------------
int ShowDateLine(int day, int EndDay, int BoxWidth);
void ShowRestOfBox(int BoxWidth, int BoxHeight);
void ShowDates(int BoxWidth);
void Divider(int BoxWidth);

//---------------------Main----------------------
int main()
{
    int StartDay, EndDay, day, counter, weeks, end;
    const int BoxWidth = 8, BoxHeight = 3;
    cout << "1. Sun  2. Mon  3. Tue  4. Wed " << endl;
    cout << "5. Thu  6. Fri  7. Sat" << endl << endl;
    do
    {
        cout << "Enter the starting day: ";
        cin >> StartDay;
        if ((StartDay < 1) || (StartDay > 7))
        {
            cout << "\aError, must be between 1 and 7.\n";
        }
    }
    while ((StartDay < 1) || (StartDay > 7)); //Error checking
    day = StartDay * -1 + 2;
    cout << "Enter the amount of days in the month: ";
    cin >> EndDay;
    cout << endl;
    weeks = (EndDay + StartDay - 2) / 7;
    weeks++;
    //----------------Draw Calendar------------------
    ShowDates(BoxWidth);
    Divider(BoxWidth);
    for (counter = 0; counter < weeks; counter++)
    {
        day = ShowDateLine(day, EndDay, BoxWidth);
        ShowRestOfBox(BoxWidth, BoxHeight);
        Divider(BoxWidth);
    }
    cin >> end; // Used to keep window open
}

//------------------Functions--------------------
int ShowDateLine(int day, int EndDay, int BoxWidth)
/* Outputs a '*' then it outputs the days till it reaches the 'EndWeek' value.
If day reaches the EndDay value, then it will output a space instead of a day.
After each date it will output a '*', then proceed 'BoxWidth' spaces ahead. */
{
    int counter, EndWeek;
    cout.setf(ios::right);
    cout << "*";
    EndWeek = day + 7;
    for (counter = 0; counter < 7; counter++, day++)
    {
        cout.width(BoxWidth - 1);
        if ((day < 1) || (day > EndDay))
        {
            cout << " ";
        }
        else
        {
            cout << day;
        }
        cout << "*";
    }
    cout << endl;

    return day;
}
//-----------------------------------------------
void ShowRestOfBox(int BoxWidth, int BoxHeight)
/* Outputs a '*' every 'BoxWidth' length, for a total of 8 '*'.
It does that 'BoxHeight' times. */
{
    int countera, counterb;
    cout.setf(ios::right);
    for (countera = 1; countera < BoxHeight + 0; countera++)
    {
        cout << "*";
        for (counterb = 0; counterb < 7; counterb++)
        {
             cout.width(BoxWidth);
             cout << "*";
        }
        cout << endl;
    }
}
//-----------------------------------------------
void ShowDates(int BoxWidth)
/* Outputs the all 7 days of the week. It takes the 'BoxWidth' and outputs the day in the
middle of where the box will be. */
{
  cout.setf(ios::right);
  cout.width(BoxWidth / 2 + 2);
  cout << "Sun";
  cout.width(BoxWidth);
  cout << "Mon";
  cout.width(BoxWidth);
  cout << "Tue";
  cout.width(BoxWidth);
  cout << "Wed";
  cout.width(BoxWidth);
  cout << "Thu";
  cout.width(BoxWidth);
  cout << "Fri";
  cout.width(BoxWidth);
  cout << "Sat" << endl;
}
//-----------------------------------------------
void Divider(int BoxWidth)
//Outputs a bar of '*' 'BoxWidth' * 7 + 1
{
    int length, counter;
    length = BoxWidth * 7 + 1;
    for (counter = 0; counter < length; counter++)
    {
        cout << "*";
    }
    cout << endl;
}

/*--------------------Output---------------------
1. Sun  2. Mon  3. Tue  4. Wed
5. Thu  6. Fri  7. Sat

Enter the starting day: 2
Enter the amount of days in the month: 28

   Sun     Mon     Tue     Wed     Thu     Fri     Sat
*********************************************************
*       *      1*      2*      3*      4*      5*      6*
*       *       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*********************************************************
*      7*      8*      9*     10*     11*     12*     13*
*       *       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*********************************************************
*     14*     15*     16*     17*     18*     19*     20*
*       *       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*********************************************************
*     21*     22*     23*     24*     25*     26*     27*
*       *       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*********************************************************
*     28*       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*       *       *       *       *       *       *       *
*********************************************************

*/