/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/cppFiles/file.cc to edit this template
 */

#include <iostream>

using namespace std;

int computerWins = 0; //update it every time the computer wins
int playerWins = 0; ////update it every time the human wins

/**The computer returns * R/r rock, P/p paper, Ss scissors.
 * The static var keeps track of how many times this methods was called;
 * @return  R, P S
 */
char computerPlay() {
    static int numberOfTimesPlayed = 0;
    numberOfTimesPlayed++;

    switch (rand() % 3) {
        case 0:
            return 'r';
            break;
        case 1:
            return 'p';
            break;
        case 2:
            return 's';
            break;
    }
}

/**The human( user)  is prompted to type * R/r rock, P/p paper, Ss scissors.
 * or Q/q to stop playing the game.
 * @return  R, P, S, Q
 */
char humanPlay() {
    bool validInput = false;
    char userInput;
    do {
        printf("Let's play Rock Paper Scissors!\n");
        printf("Please enter r for rock, p for paper, s for scissors (case insensitive): ");
        cin >> userInput;
        userInput = std::tolower(userInput, std::locale());
        printf("Player entered: %c\n", userInput);
        if (userInput == 'r' | userInput == 'p' | userInput == 's') {
            validInput = true;
        } else {
            validInput = false;
            printf("Invalid input. Please enter r, p, or s (case insensitive): ");
        }
    } while (!validInput);
    return userInput;
}

/**Displays wins and losses for human and computer.
 * 
 */
void displayStats() {
    printf("CPU: %i\n", computerWins);
    printf("Player: %i\n", playerWins);
}

std::string rps(char input) {
    std::string output;
    switch (input) {
        case 'r':
            output = "rock";
            break;
        case 'p':
            output = "paper";
            break;
        case 's':
            output = "scissors";
            break;
    }
    return output;
}

std::string determineWinner(char cpu, char player) {
    std::string output;
    if ((cpu == 'r' && player == 'r') | (cpu == 'p' && player == 'p') | (cpu == 's' && player == 's')) { // ties
        std::string beginningString = "You both chose ";
        std::string endingString = ". It is a tie.";
        std::string result = rps(cpu);
        computerWins++;
        playerWins++;
        return beginningString.append(result).append(endingString);
    }
    if ((cpu == 'r' && player == 's') | (cpu == 'p' && player == 'r') | (cpu == 's' && player == 'p')) { // CPU Wins
        std::string beginningString = "You chose";
        std::string middle = "The computer chose";
        std::string endingString = "The computer wins.";
        std::string cpuResult = " " + rps(cpu) + ". ";
        std::string playerResult = " " + rps(player) + ". ";
        computerWins++;
        return beginningString.append(playerResult).append(middle).append(cpuResult).append(endingString);
    }
    if ((player == 'r' && cpu == 's') | (player == 'p' && cpu == 'r') | (player == 's' && cpu == 'p')) { // Player Wins
        std::string beginningString = "You chose ";
        std::string middle = "The computer chose";
        std::string endingString = "You win!";
        std::string cpuResult = " " + rps(cpu) + ". ";
        std::string playerResult = " " + rps(player) + ". ";
        playerWins++;
        return beginningString.append(playerResult).append(middle).append(cpuResult).append(endingString);
    }
}

void gameLoop() {
    char userInput;
    bool continueLoop = true;
    bool playGame = true;
    do {
        if (playGame) {
            printf("%s\n", determineWinner(computerPlay(), humanPlay()).c_str());
            displayStats();
        }
        printf("Play again? Y/N (case insensitive):");
        cin >> userInput;
        userInput = std::tolower(userInput, std::locale());
        if (!(userInput == 'y' | userInput == 'n')) {
            printf("invalid input! please enter Y/N...\n");
            playGame = false;
        }
        if (userInput == 'y') {
            playGame = true;
            continueLoop = true;
        } 
        if (userInput == 'n') {
            playGame = false;
            continueLoop = false;
        }
    } while (continueLoop);
    }