using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web;

namespace VECV_WebApi.Common
{
    public class UrlShortener
    {
        public string ShortenUrl(string originalUrl)
        {
            // Compute MD5 hash of the original URL
            using (MD5 md5 = MD5.Create())
            {
                byte[] inputBytes = Encoding.ASCII.GetBytes(originalUrl);
                byte[] hashBytes = md5.ComputeHash(inputBytes);

                // Convert the byte array to a hexadecimal string
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i++)
                {
                    sb.Append(hashBytes[i].ToString("X2"));
                }

                // Take the first 8 characters of the hash as the short URL
                string shortenedHash = sb.ToString().Substring(0, 8);

                // Append the hash to the base URL
                return shortenedHash;
            }
        }
    }
}