// Add necessary includes

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;

// This is a simple game of "Rock, Paper, Scissors"
// It is also my first project ever in C++.

// Declare functions
void playGame();
bool playAgain();
string letUserChoose(string userChoice);
int genRandNum(int randomNumber);
string letComputerChoose(int randomNumber, string computerChoice);
void compareChoices(string userChoice, string computerChoice);

bool playAgain() {
	string stayOrGo;
	cout << "Type 'y' to play again, 'n' to quit.\n" << endl;
	cin >> stayOrGo;
	return stayOrGo == "y";
}

int genRandNum(int randomNumber) {
	// Generate a pseudo-random number between 1 and 3
	srand(time(0));
	randomNumber = rand() % 3 + 1;
	return randomNumber;
}

string letUserChoose(string userChoice) {
	// Let the user choose either rock, paper or scissors
	cout << "\n\nPlease use only lower-case letters!" << endl;
	cout << "\n\nDo you choose 'rock', 'paper' or 'scissors'?\n" << endl;
	cin >> userChoice;
	cout << "\nYou have chosen: " << userChoice << endl;
	return userChoice;
}

string letComputerChoose(int randomNumber, string computerChoice) {
	// 1 = Rock, 2 = Paper, 3 = Scissors, assign a choice to the computer.
	if (randomNumber == 1) {
		computerChoice = "rock";
	}
	else if (randomNumber == 2) {
		computerChoice = "paper";
	}
	else {
		computerChoice = "scissors";
	}
	cout << "\nThe computer chose: " << computerChoice << endl;
	return computerChoice;
}

void compareChoices(string userChoice, string computerChoice) {
	// Decide who wins by comparing the userChoice and computerChoice
	// Choose what happens if userChoice is rock
	if (userChoice == "rock") {
		if (computerChoice == "paper") {
			cout << "\nPaper beats rock, you lose!\n\n";
		}
		else if (computerChoice == "scissors") {
			cout << "\nRock beats scissors, you win!\n\n";
		}
		else {
			cout << "\nIt's a tie!\n\n";
		}
	}

	// Choose what happens if userChoice is paper
	if (userChoice == "paper") {
		if (computerChoice == "scissors") {
			cout << "\nScissors beats paper, you lose!\n\n";
		}
		else if (computerChoice == "rock") {
			cout << "\nPaper beats rock, you win!\n\n";
		}
		else {
			cout << "\nIt's a tie!\n\n";
		}
	}

	// Choose what happens if userChoice is scissors
	if (userChoice == "scissors") {
		if (computerChoice == "rock") {
			cout << "\nRock beats scissors, you lose!\n\n";
		}
		else if (computerChoice == "paper") {
			cout << "\nScissors beats paper, you win!\n\n";
		}
		else {
			cout << "\nIt's a tie!\n\n";
		}
	}
}

void playGame(string userChoice, int randomNumber, string computerChoice) {
	letUserChoose(userChoice);
	genRandNum(randomNumber);
	letComputerChoose(randomNumber, computerChoice);
	compareChoices(userChoice, computerChoice);
}

int main(int nNumberofArgs, char* pszArgs[]) {
	// Initialize variables
	string userChoice = letUserChoose(userChoice);
	int randomNumber = genRandNum(randomNumber);
	string computerChoice = letComputerChoose(randomNumber, computerChoice);

	// Main loop of the game
	do {
		playGame();
	} while (playAgain());
	// Let the player know that he or she has chosen to exit the game
	cout << "\nYou have chosen to exit the game.\n\n";
	system("PAUSE");
	return 0;
}