using System;
using System.Security;
using System.Runtime.InteropServices;
using DBToolControls;
using System.Xml.Linq;

namespace DBToolControls {
    public class User : IDisposable{
        public string Username { get; private set; }
        private SecureString password;

        public int PasswordLength {
            get { return password.Length; }
        }

        public string PasswordAsInsecureString {
            get {
                IntPtr passwordBSTR = default(IntPtr);
                try {
                    passwordBSTR = Marshal.SecureStringToBSTR(password);
                    return Marshal.PtrToStringBSTR(passwordBSTR);
                } catch {
                    return "";
                }
            }
        }

        // Constructors

         public User(string username) {
             this.Username = username;
             this.password = new SecureString();
         }

        public User(string username, SecureString password) {
            this.Username = username;
            this.password = password;
        }

        public User(string username, string encryptedPassword, string encryptionKey) {
            this.Username = username;
            this.password = EncryptionHelper.DecryptStringAsSecureString(encryptionKey, encryptedPassword);
        }

        // Methods

        public string EncryptedPassword(string encryptionKey) {
            return EncryptionHelper.EncryptString(encryptionKey, this.PasswordAsInsecureString);
        }

        public void Dispose() {
            password.Dispose();
            GC.SuppressFinalize(this);
        }

        public XElement ToXElement(string pw) {
            return new XElement("User",
                new XElement("Username", Username),
                PasswordLength > 0 ? new XElement("Password", EncryptedPassword(pw)) : null);
        }
    }
}