using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ServiceShared.Crypto
{
    public static class ProtectedServiceRun
    {
        /// <summary>
        /// Verifies the SecureHash by password
        /// </summary>
        /// <param name="secureHash">secure hash from the appsettings.json</param>
        /// <returns></returns>
        public static bool Verified(string secureHash)
        {
            bool result = false;

            if(string.IsNullOrEmpty(secureHash))
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("SecureHash was not found in the appsettings.json");
                Console.WriteLine("Please encrypt the string \"ServiceOutside\" with ServiceShared.Crypto.AES.Encryption method and store the value by SecureHash in the appsettings.json");
                Console.ForegroundColor = ConsoleColor.White;
            }
            else
            {
                bool password_successfully = false;
                bool exited = false;
                string password = "";
                ConsoleKeyInfo key;

                while (!password_successfully && !exited)
                {
                    Console.Write("Please enter your master password: ");

                    do
                    {
                        key = Console.ReadKey(true);

                        if (key.Key == ConsoleKey.Escape)
                        {
                            exited = true;
                            break;
                        }
                        else if (key.Key == ConsoleKey.Enter)
                        {
                            byte[] aesKey = AES.GetKey(password);
                            string decrypted = AES.Decrypt(secureHash, aesKey);

                            if(!string.IsNullOrEmpty(decrypted) && decrypted == "SecureHash")
                            {
                                AES.SetMemoryMasterKey(password);
                                password_successfully = true;
                                result = true;
                                break;
                            }
                            else
                            {
                                password = "";
                                Console.Clear();
                                break;
                            }
                        }
                        else
                        {
                            password += key.KeyChar;
                            Console.Write("*");
                        }
                    }
                    while (key.Key != ConsoleKey.Escape && key.Key != ConsoleKey.Escape);
                }
            }

            Console.Clear();

            return result;
        }
    }
}