using System;

using System.Collections.Generic;

​

public class Num3{

    const int numToCreate = 3;

    const string startMsg = "Guess the number please.";

    const string wrongMsg = "[!]Eat-{0}, BITE-{1}, try again~";

    const string rightMsg = "[✓]Bingo!";

    const string digitMsg = "[!]Please input a num of three digits.";

    const string closeOrNot = "[?]Open a new game?\nEnter Q to quit or any other key to continue.";

    string num;

    public static void Main(string[] args){

        while(Application()){}

    }

    static bool Application(){

        string num = CreateNums();

        Console.WriteLine(startMsg);

        string userInput = getUserInput();

        while(CheckNum(num, userInput) == false){

            userInput = getUserInput();

        }

        Console.WriteLine(rightMsg);

        Console.WriteLine(closeOrNot);

        string choise = Console.ReadLine();

        if(choise == "Q" || choise == "q"){

            Console.WriteLine("See you again~");

            return false;

        }

        else{

            Console.WriteLine();

            return true;

        }

    }

    static string CreateNums(){

        int[] numArray = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9};

        var lNum = new List<int>(numArray);

        int[] nums = new int[numToCreate];

        Random rand = new Random();

        for(int i=0; i<numToCreate; i++){

            int startIdx = 0;

            int endIdx = 9-i;

            int index = rand.Next(startIdx, endIdx); 

            int num = Int32.Parse(lNum[index].ToString());

            lNum.Remove(num);

            nums[i] = num;

        }

        //convert nums to int

        int res = 0;

        for(int i=0; i<numToCreate; i++){

            int digit = Convert.ToInt32(Math.Pow(10, numToCreate-1-i));

            res += nums[i] * digit;

        }

        return res.ToString();

    }

    static string getUserInput(){

        string input = Console.ReadLine();

        while(CheckInput(input) == false){

            Console.WriteLine(digitMsg);

            input = Console.ReadLine();

        }

        return input;

    }

    static bool CheckInput(string input){

        if(input.Length == 3)

            return true;

        else

            return false;

    }

    static bool CheckNum(string answer, string input){

        if(String.Equals(answer, input))

            return true;

        else{

            int eat = 0;

            int bite = 0;

            var answers = new List<char>();

            var inputs = new List<char>();

            //check count of eat

            for(int i=0; i<numToCreate; i++){

                if(answer[i] == input[i])

                    eat++;

                else{

                    answers.Add(answer[i]);

                    inputs.Add(input[i]);

                }

            }

            //check count of bite

            for(int i=0; i<answers.Count; i++){

                for(int j=0; j<inputs.Count; j++){

                    //alAnswer[i] and alInput[j] have been compared

                    //in region eat in case i == j

                    if(i == j)

                        continue;

                    else

                        if(answers[i] == inputs[j])

                            bite++;

                }

            }

            Console.WriteLine(wrongMsg, eat, bite);

            Console.WriteLine();

            return false;

        }

    }

}