using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace Taloyhtio.GeneralSSO.Server.CodeFiles.Common
{
    public static class Utils
    {
        // See example from Pro ASP.Net Web API Security, Chapter 6
        public static X509Certificate2 GetCert(string subjectName, StoreName storeName, StoreLocation storeLocation)
        {
            X509Store store = null;
            try
            {
                store = new X509Store(storeName, storeLocation);
                store.Open(OpenFlags.ReadOnly);
                var cert = store.Certificates.OfType<X509Certificate2>().FirstOrDefault(
                    c =>
                        {
                            string name = c.SubjectName.Name;
                            if (name.StartsWith("CN="))
                            {
                                name = name.Substring(3);
                            }
                            return string.Compare(name, subjectName, true) == 0;
                        });
                return (cert != null ? new X509Certificate2(cert) : null);
            }
            finally
            {
                if (store != null)
                {
                    store.Certificates.OfType<X509Certificate2>().ToList().ForEach(c => c.Reset());
                    store.Close();
                }
            }
        }

        // Get user name without membership provider prefix
        public static string GetUserName(string loginName)
        {
            if (string.IsNullOrEmpty(loginName))
            {
                return string.Empty;
            }

            int idx = loginName.IndexOf(":");
            if (idx > 0)
            {
                loginName = loginName.Substring(idx + 1);
            }
            return loginName;
        }
    }
}