using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Launcher_Client
{
    public class Hashing
    {
        public static String GetMD5Hash(String FilePath)
        {
            MD5 MD5Crypto = MD5.Create();

            using (FileStream PStream = File.OpenRead(FilePath)) { return BitConverter.ToString(MD5Crypto.ComputeHash(PStream)).Replace("-", String.Empty); }
        }

        public static String GetSHA1Hash(String FilePath)
        {
            SHA1CryptoServiceProvider SHA1Crypto = new SHA1CryptoServiceProvider();

            using (FileStream PStream = File.OpenRead(FilePath)) { return BitConverter.ToString(SHA1Crypto.ComputeHash(PStream)).Replace("-", String.Empty); }
        }

        public static String GetSHA256Hash(String FilePath)
        {
            SHA256Managed SHA256Crypto = new SHA256Managed();

            using (FileStream PStream = File.OpenRead(FilePath))
            {
                Byte[] SHA256Buffer = SHA256Crypto.ComputeHash(PStream);

                return BitConverter.ToString(SHA256Buffer).Replace("-", String.Empty);
            }
        }

        public static string CalculateMD5Hash(string input)
        {
            // step 1, calculate MD5 hash from input
            MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
            byte[] hash = md5.ComputeHash(inputBytes);

            // step 2, convert byte array to hex string
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {
                sb.Append(hash[i].ToString("X2"));
            }
            return sb.ToString();
        }
    }
}