/*
  Name: Assignment 3 with random number predefined
  Author: muguangde
  Data: 2014-07-25-8.10.AM
  Description: This is a simple program used to play a game with
  two dices. The user can choose to generate two initial random numbers,
  or read them from a file. Later on printing out winning
  info according to the sum of them. Then modify both, and repeat
  the procedure.
*/
#include 
#include 
#include 
#include 
using namespace std;

int main()
{
    int result1=0,result2=0;
    int num1=0,num2=0;
    int secondNum1=0,secondNum2=0;
    int firstWin=0,firstLose=0,firstDraw=0;
    int secondWin=0,secondLose=0,secondDraw=0;
    int doubleWin=0,doubleLose=0;
    int outcome(int,int);
    int newNum(int);
    int newNum2(int);
    int randomOrNot;
    string winOrLose(int);
    ofstream outfile;
    ifstream infile;
    outfile.open("output.txt");
    //To decide whether or not to use random number
    cout<<"Do you want to use random number? YES:1 NO:0"<<endl;
    cin>>randomOrNot;
    while(randomOrNot!=0 && randomOrNot!=1) {
        cout<<"Error: input 1 for YES and 0 for NO"<<endl;
        cin>>randomOrNot;
    }

    outfile<<"**************************************************"<<endl;
    outfile<<"*Dice game: if sum of two number = 5,7 or 12,win**"<<endl;
    outfile<<"*if sum = 2,4 or 11,lose, other = draw************"<<endl;
    outfile<<"**************************************************"<<endl;
    outfile<<"\nOriginal pair"<<"\tWinning info"<<" |"<<" New pair"
           <<"\t\tWinning info"<<endl;
    // Get random seed
    srand (time(NULL));

    if(randomOrNot) {
        for(int i=0; i<20; i++) {
            // generate random number between 1 and 6
            num1 = rand() % 6 + 1;
            num2 = rand() % 6 + 1;
            //To get first winning result, because the numbers are
            //fixed in range 1-6, no need to check whether it's valid.
            result1=outcome(num1,num2);
            if(result1==0)
                firstDraw++;
            else if(result1==-1)
                firstLose++;
            else if(result1==1)
                firstWin++;
            //To calculate the second winning result
            secondNum1=newNum(num1);
            secondNum2=newNum2(num2);
            result2=outcome(secondNum1,secondNum2);
            if(result2==0)
                secondDraw++;
            else if(result2==-1)
                secondLose++;
            else if(result2==1)
                secondWin++;

            if(result1==1 && result2==1)
                doubleWin++;
            if(result1==-1 && result2==-1)
                doubleLose++;

            outfile<<num1<<"\t"<<num2<<"\t"<<winOrLose(result1)
                   <<"\t"<<"     | "<<secondNum1<<"\t"<<secondNum2<<"\t"
                   <<winOrLose(result2)<<endl;
        }
    } else {
        ifstream infile;
        infile.open("input.txt");
        if(!infile.is_open()) {
            //If the file can't be opened
            cout<<endl<<"Error: unable to open file."<<endl;
            system("PAUSE");
            exit(1);
        }

        infile>>num1>>num2;


        while(!infile.eof()) {
            //To the first winning result, if data valid then continue
            if(num1<=6 && num1>0 && num2<=6 && num2>0) {
                result1=outcome(num1,num2);
                if(result1==0)
                    firstDraw++;
                else if(result1==-1)
                    firstLose++;
                else if(result1==1)
                    firstWin++;
                //To calculate the second winning result
                secondNum1=newNum(num1);
                secondNum2=newNum2(num2);
                result2=outcome(secondNum1,secondNum2);
                if(result2==0)
                    secondDraw++;
                else if(result2==-1)
                    secondLose++;
                else if(result2==1)
                    secondWin++;

                if(result1==1 && result2==1)
                    doubleWin++;
                if(result1==-1 && result2==-1)
                    doubleLose++;

                outfile<<num1<<"\t"<<num2<<"\t"<<winOrLose(result1)
                       <<"\t"<<"     | "<<secondNum1<<"\t"<<secondNum2<<"\t"
                       <<winOrLose(result2)<<endl;
            } else
                //If the input not valid, return invalid info
                outfile<<num1<<"\t"<<num2<<"\t"
                       <<"*******Invalid data*******"<<endl;
            infile>>num1>>num2;
        }
    }
    outfile<<"\nThe original pair of dice gave "<<firstWin<<" winners, "
           <<firstLose<<" losers and "<<firstDraw<<" draws."<<endl;
    outfile<<"\nThe new pair of dice gave "<<secondWin<<" winners, "
           <<secondLose<<" losers and "<<secondDraw<<" draws."<<endl;
    outfile<<"\nThere are "<<doubleWin<<" double winners"
           <<" and "<<doubleLose<<" double losers."<<endl;

    infile.close();
    outfile.close();
    system("PAUSE");
    return 0;
}
//Function to calculate outcome
int outcome(int num1,int num2)
{
    int sum=0,result=0;
    sum=num1+num2;

    if(sum==5 || sum==7 || sum==12)
        result=1;
    else if(sum==2 || sum==4 || sum==11)
        result=-1;
    else
        result=0;

    return result;
}
//Function to add two and adjust value accordingly
int newNum(int num)
{
    int addTwo=0;
    addTwo=num+2;

    if(addTwo>6)
        addTwo=addTwo-6;

    return addTwo;
}

int newNum2(int num)
{
    int addTwo=0;
    addTwo=num+3;

    if(addTwo>6)
        addTwo=addTwo-6;

    return addTwo;
}
//Return winning situation
string winOrLose(int result)
{
    string winCase;
    if(result==1)
        winCase="Win";
    else if(result==-1)
        winCase="Lose";
    else if(result==0)
        winCase="Draw";

    return winCase;
}