using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace Tanshu.Accounts.BI
{
    public delegate bool AuthenticateUser(out string userName);
    public class RoleBI : IDisposable
    {
        string roleID;
        Guid userID;
        bool elevated;
        AccountsPrincipal originalUser;
        AuthenticateUser authenticateUser;
        public RoleBI(string roleID, Guid userID)
        {
            this.roleID = roleID;
            this.userID = userID;
            elevated = false;
            originalUser = null;
            authenticateUser = null;
        }
        public bool IsAllowed
        {
            get
            {
                return new MembershipBI().IsUserInRole(userID, roleID);
            }
        }

        public bool IsElevated
        {
            get
            {
                return elevated;
            }
        }

        public void Evelvate(AuthenticateUser authenticateUser)
        {
            this.authenticateUser = authenticateUser;
            string userName;
            if (this.authenticateUser(out userName))
            {
                originalUser = (AccountsPrincipal)Thread.CurrentPrincipal;
                SetElevation(userName);
            }
        }
        private void SetElevation(string userName)
        {
            if (userName.Contains(":"))
                userName = userName.Substring(userName.IndexOf(":") + 1);

            AccountsPrincipal principal = AccountsPrincipal.CreateAccountsPrincipal(new Tanshu.Accounts.BI.MembershipBI().GetRolesForUser(userName),
                new MembershipBI().GetUserFromName(userName));

            // bind the generic principal to the thread
            Thread.CurrentPrincipal = principal;
            userName = ((AccountsIdentity)principal.Identity).UserInfo.Name;
            userID = ((AccountsIdentity)principal.Identity).UserInfo.UserID;
            elevated = true;
        }

        public void Dispose()
        {
            if (elevated)
            {
                Thread.CurrentPrincipal = originalUser;
            }
        }
    }
}