// Programmieren 1, Praktikum 4, Aufgabe 1
// Sven Eisenhauer
// 08.12.2004
//
// file: main.cpp
//
// purpose: Play craps and analyse results
//          
//          
//          
//

#include <iostream>

using std::cout;
using std::endl;

#include <iomanip>

using std::setprecision;
using std::setw;

// contains function prototypes for functions srand and rand
#include <cstdlib>

#include <ctime>   // contains prototype for function time

int rollDice( void );  // function prototype

int main()
{
   // enumeration constants represent game status
   enum Status { CONTINUE, WON, LOST };

   int sum;
   int myPoint;

   const int maxGames=1000000;
   const int maxRounds=22;

   int round=1,
	   sumWon=0,
	   sumLost=0,
	   wRounds=0;

   int nrLost[maxRounds]={0},
	   nrWon[maxRounds]={0};

   Status gameStatus;  // can contain CONTINUE, WON or LOST

   // randomize random number generator using current time
   srand( time( 0 ) ); 

   for (int i=1;i<=maxGames;i++)
   {
	 round=1;
	 sum = rollDice();           // first roll of the dice

     // determine game status and point based on sum of dice
     switch ( sum ) {

      // win on first roll
      case 7: 
	   case 11:            
         gameStatus = WON;
         break;

      // lose on first roll
      case 2: 
	   case 3: 
	   case 12:             
         gameStatus = LOST;
         break;

      // remember point
      default:            
         gameStatus = CONTINUE;
         myPoint = sum;
         // cout << "Point is " << myPoint << endl;
         break;                // optional   

	 } // end switch 

     // while game not complete ...
     while ( gameStatus == CONTINUE ) { 
       sum = rollDice();           // roll dice again
	   round++;

       // determine game status
       if ( sum == myPoint )       // win by making point
		   gameStatus = WON;
       else
           if ( sum == 7 )          // lose by rolling 7
              gameStatus = LOST;

	 } // end while 

     // display won or lost message
     if ( gameStatus == WON )
       //cout << "Player wins" << endl;
	   if (round<maxRounds)
		   nrWon[round]++;
	   else
		   nrWon[maxRounds-1]++;
     else
       //cout << "Player loses" << endl;
	   if (round<maxRounds)
		   nrLost[round]++;
	   else
		   nrLost[maxRounds-1]++;

   }

   cout << setw(7)<<"Round"<< setw(7)<< "won" << setw(7)<<"lost"<<endl;

   for (i=1;i<maxRounds;i++)
   {
	   cout << setw(7) << i << setw(7)  << nrWon[i]  << setw(7) << nrLost[i] << endl;
	   sumWon+=nrWon[i];
	   sumLost+=nrLost[i];
	   wRounds+=((nrWon[i]*i)+(nrLost[i]*i));
   }
   cout << endl <<"Total won: " << sumWon << " Total lost: " << sumLost << " Chance to win: "
	   << setprecision(4) << (static_cast <double> (sumWon)/maxGames)*100 << "%" << endl;
   cout << "Average Game length: "<< setprecision(2) << static_cast <double> (wRounds)/maxGames << " Rounds" << endl;

   return 0;  // indicates successful termination

} // end main

// roll dice, calculate sum and display results
int rollDice( void )
{
   int die1;
   int die2;
   int workSum;

   die1 = 1 + rand() % 6;  // pick random die1 value
   die2 = 1 + rand() % 6;  // pick random die2 value
   workSum = die1 + die2;  // sum die1 and die2

   // display results of this roll
   // cout << "Player rolled " << die1 << " + " << die2
   //     << " = " << workSum << endl;

   return workSum;         // return sum of dice

} // end function rollDice