using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;

namespace MvcTableDemo.Models
{

    #region Models
    [PropertiesMustMatch ("NewPassword", "ConfirmPassword", ErrorMessage = "The new password and confirmation password do not match.")]
    public class ChangePasswordModel
    {
        [Required]
        [DataType (DataType.Password)]
        [DisplayName ("Current password")]
        public string OldPassword { get; set; }

        [Required]
        [ValidatePasswordLength]
        [DataType (DataType.Password)]
        [DisplayName ("New password")]
        public string NewPassword { get; set; }

        [Required]
        [DataType (DataType.Password)]
        [DisplayName ("Confirm new password")]
        public string ConfirmPassword { get; set; }
    }

    public class LogOnModel
    {
        [Required]
        [DisplayName ("User name")]
        public string UserName { get; set; }

        [Required]
        [DataType (DataType.Password)]
        [DisplayName ("Password")]
        public string Password { get; set; }

        [DisplayName ("Remember me?")]
        public bool RememberMe { get; set; }
    }

    [PropertiesMustMatch ("Password", "ConfirmPassword", ErrorMessage = "The password and confirmation password do not match.")]
    public class RegisterModel
    {
        [Required]
        [DisplayName ("User name")]
        public string UserName { get; set; }

        [Required]
        [DataType (DataType.EmailAddress)]
        [DisplayName ("Email address")]
        public string Email { get; set; }

        [Required]
        [ValidatePasswordLength]
        [DataType (DataType.Password)]
        [DisplayName ("Password")]
        public string Password { get; set; }

        [Required]
        [DataType (DataType.Password)]
        [DisplayName ("Confirm password")]
        public string ConfirmPassword { get; set; }
    }
    #endregion

    #region Services
    // The FormsAuthentication type is sealed and contains static members, so it is difficult to
    // unit test code that calls its members. The interface and helper class below demonstrate
    // how to create an abstract wrapper around such a type in order to make the AccountController
    // code unit testable.

    public interface IMembershipService
    {
        int MinPasswordLength { get; }

        bool ValidateUser (string userName, string password);
        MembershipCreateStatus CreateUser (string userName, string password, string email);
        bool ChangePassword (string userName, string oldPassword, string newPassword);
    }

    public class AccountMembershipService : IMembershipService
    {
        private readonly MembershipProvider _provider;

        public AccountMembershipService ()
            : this (null)
        {
        }

        public AccountMembershipService (MembershipProvider provider)
        {
            _provider = provider ?? Membership.Provider;
        }

        public int MinPasswordLength
        {
            get
            {
                return _provider.MinRequiredPasswordLength;
            }
        }

        public bool ValidateUser (string userName, string password)
        {
            if (String.IsNullOrEmpty (userName)) throw new ArgumentException ("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty (password)) throw new ArgumentException ("Value cannot be null or empty.", "password");

            return _provider.ValidateUser (userName, password);
        }

        public MembershipCreateStatus CreateUser (string userName, string password, string email)
        {
            if (String.IsNullOrEmpty (userName)) throw new ArgumentException ("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty (password)) throw new ArgumentException ("Value cannot be null or empty.", "password");
            if (String.IsNullOrEmpty (email)) throw new ArgumentException ("Value cannot be null or empty.", "email");

            MembershipCreateStatus status;
            _provider.CreateUser (userName, password, email, null, null, true, null, out status);
            return status;
        }

        public bool ChangePassword (string userName, string oldPassword, string newPassword)
        {
            if (String.IsNullOrEmpty (userName)) throw new ArgumentException ("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty (oldPassword)) throw new ArgumentException ("Value cannot be null or empty.", "oldPassword");
            if (String.IsNullOrEmpty (newPassword)) throw new ArgumentException ("Value cannot be null or empty.", "newPassword");

            // The underlying ChangePassword() will throw an exception rather
            // than return false in certain failure scenarios.
            try
            {
                MembershipUser currentUser = _provider.GetUser (userName, true /* userIsOnline */);
                return currentUser.ChangePassword (oldPassword, newPassword);
            }
            catch (ArgumentException)
            {
                return false;
            }
            catch (MembershipPasswordException)
            {
                return false;
            }
        }
    }

    public interface IFormsAuthenticationService
    {
        void SignIn (string userName, bool createPersistentCookie);
        void SignOut ();
    }

    public class FormsAuthenticationService : IFormsAuthenticationService
    {
        public void SignIn (string userName, bool createPersistentCookie)
        {
            if (String.IsNullOrEmpty (userName)) throw new ArgumentException ("Value cannot be null or empty.", "userName");

            FormsAuthentication.SetAuthCookie (userName, createPersistentCookie);
        }

        public void SignOut ()
        {
            FormsAuthentication.SignOut ();
        }
    }
    #endregion

    #region Validation
    public static class AccountValidation
    {
        public static string ErrorCodeToString (MembershipCreateStatus createStatus)
        {
            // See http://go.microsoft.com/fwlink/?LinkID=177550 for
            // a full list of status codes.
            switch (createStatus)
            {
                case MembershipCreateStatus.DuplicateUserName:
                    return "Username already exists. Please enter a different user name.";

                case MembershipCreateStatus.DuplicateEmail:
                    return "A username for that e-mail address already exists. Please enter a different e-mail address.";

                case MembershipCreateStatus.InvalidPassword:
                    return "The password provided is invalid. Please enter a valid password value.";

                case MembershipCreateStatus.InvalidEmail:
                    return "The e-mail address provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidAnswer:
                    return "The password retrieval answer provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidQuestion:
                    return "The password retrieval question provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidUserName:
                    return "The user name provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.ProviderError:
                    return "The authentication provider returned an error. Please verify your entry and try again. If the problem persists, please contact your system administrator.";

                case MembershipCreateStatus.UserRejected:
                    return "The user creation request has been canceled. Please verify your entry and try again. If the problem persists, please contact your system administrator.";

                default:
                    return "An unknown error occurred. Please verify your entry and try again. If the problem persists, please contact your system administrator.";
            }
        }
    }

    [AttributeUsage (AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    public sealed class PropertiesMustMatchAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' and '{1}' do not match.";
        private readonly object _typeId = new object ();

        public PropertiesMustMatchAttribute (string originalProperty, string confirmProperty)
            : base (_defaultErrorMessage)
        {
            OriginalProperty = originalProperty;
            ConfirmProperty = confirmProperty;
        }

        public string ConfirmProperty { get; private set; }
        public string OriginalProperty { get; private set; }

        public override object TypeId
        {
            get
            {
                return _typeId;
            }
        }

        public override string FormatErrorMessage (string name)
        {
            return String.Format (CultureInfo.CurrentUICulture, ErrorMessageString,
                OriginalProperty, ConfirmProperty);
        }

        public override bool IsValid (object value)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties (value);
            object originalValue = properties.Find (OriginalProperty, true /* ignoreCase */).GetValue (value);
            object confirmValue = properties.Find (ConfirmProperty, true /* ignoreCase */).GetValue (value);
            return Object.Equals (originalValue, confirmValue);
        }
    }

    [AttributeUsage (AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public sealed class ValidatePasswordLengthAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' must be at least {1} characters long.";
        private readonly int _minCharacters = Membership.Provider.MinRequiredPasswordLength;

        public ValidatePasswordLengthAttribute ()
            : base (_defaultErrorMessage)
        {
        }

        public override string FormatErrorMessage (string name)
        {
            return String.Format (CultureInfo.CurrentUICulture, ErrorMessageString,
                name, _minCharacters);
        }

        public override bool IsValid (object value)
        {
            string valueAsString = value as string;
            return (valueAsString != null && valueAsString.Length >= _minCharacters);
        }
    }
    #endregion

}
