/* 
   CPP 230 - Fall 2007
   Chapter 5 - Project 13
   by: Joey Burgett
   Instructor: Mark Laffoon
*/

#include <cstdlib>
#include <iostream>

using namespace std;

int matrix [] = { 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8 };
int tokens [4][4];
bool visible [4][4];
int pairs=0;

void MatrixAssign();
void Scramble();
void DisplayBoard(int tokens[][4]);
bool FindPair(int,int,int,int);

int main()
{
    srand(time(NULL));
    Scramble();
    MatrixAssign();

    while(true==true){
        if (pairs>7) 
        {
           cout << "\nGame Over!\n" << endl;
           break;
        }
        DisplayBoard(tokens);
        int x1,y1,x2,y2;
        cout << "\nEnter X Coordinate 1: ";
        cin >> x1;
        if (x1<1) break;
        cout << "\nEnter Y Coordinate 2: ";
        cin >> y1;
        cout << "\nEnter X Coordinate 1: ";
        cin >> x2;
        cout << "\nEnter Y Coordinate 2: ";
        cin >> y2;
        if ((x1>4) || (x2>4) || (y1>4) || (y2>4) || (x2<0) || (y1<0) || (y2<0))
        {
           cout << "\nCoordinates must be 1 thru 4!\n" << endl;
        } else {
           if (FindPair(x1-1,y1-1,x2-1,y2-1)==true) 
           {
              cout << "Match Found!\n" << endl;
              pairs++;
           }
        }   
        system("PAUSE");
    }
    system("PAUSE");
    return EXIT_SUCCESS;
}

void Scramble()
{
    int tmp [16];
    for (int counter=0;counter<15;counter++)
    {
     tmp[0]=(rand()%15)+1;
     tmp[1]=matrix[tmp[0]];
     tmp[2]=matrix[counter];
     matrix[counter]=tmp[1];
     matrix[tmp[0]]=tmp[2];
    }
}

bool FindPair(int x1,int y1,int x2,int y2)
{
     if (tokens[x1][y1]==tokens[x2][y2])
        {
           visible[x1][y1]=true;
           visible[x2][y2]=true;
           return true;
        } else {
               return false;
               }
}

void MatrixAssign()
{
     int counter=0;
     for (int x=0;x<4;x++)
     {
             for (int y=0;y<4;y++)
             {
                 tokens[x][y]=matrix[counter];
                 visible[x][y]=false;
                 counter++;
             }
     }
}

void DisplayBoard(int tokens[][4])
{
     system("CLS");
     int counter=0;
     cout << "     | 1  2  3  4  \n";
     cout << " ___________________\n";
     for (int x=0;x<4;x++)
     {
         cout << "   " << x+1 << " |";
         for (int y=0;y<4;y++)
         {
             if (!visible[x][y]) {
               cout << " " << tokens[x][y] << " ";
             } else {
               cout << " * ";
             }
             counter++;
         }
         cout << "\n";
     }
}