//------------------------------------------- 
// 
// roombaWorld.cpp
//
// A simple game in which the player moves roomba
// around in search of dirt for it to vacuum up.
// 
// Simon Parsons 
// September 10th 2008
 
// 
// Include C++ library definitions
 
#include <iostream>  // for cout
#include <cstdlib>   // for rand
#include <ctime>     // for time

using namespace std;

//
// Declare variables
 
int x;          // robot's x position
int y;          // robot's y position
int dirtX;      // home x position
int dirtY;      // home y position
char c;         // user's input
bool q;         // does user want to quit?

//
// Declare methods
 
void displayPosition()
{
    int dx;
    int dy;

    for(dy=10; dy>=0; dy--)
    {
        cout << "\n-----------------------\n";

        for (dx=0; dx<=11; dx++)
        {
            if((x == dx) && (y == dy))
            {
                cout << "|O";
            }
            else
            if((dirtX ==dx) && (dirtY == dy))
            {
                cout << "|x";
            }
            else
            {
                cout << "| ";
            }
        }
    }

    cout << "\n-----------------------\n\n";

}

void moveNorth() 
{
  cout << "moving North...\n";
  y = y + 1;
}

void moveSouth() 
{
  cout << "moving South...\n";
  y = y - 1;
}

void moveWest() 
{
  cout << "moving West...\n";
  x = x - 1;
}

void moveEast() 
{
  cout << "moving East...\n";
  x = x + 1;
}
 
bool didWeWin()
{
  if((x == dirtX)&&(y == dirtY)){
    return true;
  }
  else{
    return false;
  }
}

//
// Define main method
 
int main() 
 
{

  srand(time(NULL));    // Initialise random number generator

  x = 0;                // Set the location of the roomba
  y = 0;
  q = false;            // Make sure we don't quit right away

  dirtX = rand() % 11;  // Pick a random location for the dirt
  dirtY = rand() % 11;

  displayPosition();

  // We keep doing this until the user tells us to stop, or the
  // user wins.

  while ( q==false ){
 
   // Get input from user 

   cout << "Which way should the robot move (enter N,S,E,W or Q)? ";
   cin  >> c;
   cout << "You entered: ";
   cout << c;
   cout << "\n"; 
 
   // Depending on what the user entered, move the right way 

   if ( c=='N' ) {
     moveNorth();
     displayPosition();
   } 

   if ( c=='S' ) {
     moveSouth();
     displayPosition();
   }
 
   if ( c=='E' ) {
     moveEast();
     displayPosition();
   }
 
   if ( c=='W' ) {
     moveWest();
     displayPosition();
   }
 
   // If the user entered Q or the user won, set up so that we finish. 
 
   if (didWeWin()) {
     q = true;
     cout << "You won!" << endl;
   }
     
   if ( c=='Q' ) {
     q = true;
     cout << "You lost!" << endl;
   }
  }
 
  cout << "Time to go!" << endl;
  return 0;
}