using System.Linq;
using System.Threading.Tasks;
using System.Web;
using System.Web.Mvc;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin.Security;
using Web.Models;

namespace Web.Controllers
{
    [Authorize]
    public class ManageController : Controller
    {
        private ApplicationSignInManager _signInManager;
        private ApplicationUserManager _userManager;

        public ManageController()
        {
        }

        public ManageController(ApplicationUserManager userManager, ApplicationSignInManager signInManager)
        {
            UserManager = userManager;
            SignInManager = signInManager;
        }

        public ApplicationSignInManager SignInManager
        {
            get
            {
                return _signInManager ?? HttpContext.GetOwinContext().Get<ApplicationSignInManager>();
            }
            private set 
            { 
                _signInManager = value; 
            }
        }

        public ApplicationUserManager UserManager
        {
            get
            {
                return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
            }
            private set
            {
                _userManager = value;
            }
        }

        //
        // GET: /Manage/SetPassword
        public ActionResult SetPassword()
        {
            return View();
        }

        //
        // POST: /Manage/SetPassword
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> SetPassword(SetPasswordViewModel model)
        {
            if (ModelState.IsValid)
            {
                var result = await UserManager.AddPasswordAsync(User.Identity.GetUserId(), model.NewPassword);
                if (result.Succeeded)
                {
                    var user = await UserManager.FindByIdAsync(User.Identity.GetUserId());
                    if (user != null)
                    {
                        await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                    }
                    return RedirectToAction("Index", new { Message = ManageMessageId.SetPasswordSuccess });
                }
                AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }

        //
        // GET: /Manage/ManageLogins
        public async Task<ActionResult> ManageLogins(ManageMessageId? message)
        {
            ViewBag.StatusMessage =
                message == ManageMessageId.RemoveLoginSuccess ? "The external login was removed."
                : message == ManageMessageId.Error ? "An error has occurred."
                : "";
            var user = await UserManager.FindByIdAsync(User.Identity.GetUserId());
            if (user == null)
            {
                return View("Error");
            }
            var userLogins = await UserManager.GetLoginsAsync(User.Identity.GetUserId());
            var otherLogins = AuthenticationManager.GetExternalAuthenticationTypes().Where(auth => userLogins.All(ul => auth.AuthenticationType != ul.LoginProvider)).ToList();
            ViewBag.ShowRemoveButton = user.PasswordHash != null || userLogins.Count > 1;
            return View(new ManageLoginsViewModel
            {
                CurrentLogins = userLogins,
                OtherLogins = otherLogins
            });
        }
    
        protected override void Dispose(bool disposing)
        {
            if (disposing && _userManager != null)
            {
                _userManager.Dispose();
                _userManager = null;
            }

            base.Dispose(disposing);
        }

#region Helpers
        // Used for XSRF protection when adding external logins
        private const string XsrfKey = "XsrfId";

        private IAuthenticationManager AuthenticationManager
        {
            get
            {
                return HttpContext.GetOwinContext().Authentication;
            }
        }

        private void AddErrors(IdentityResult result)
        {
            foreach (var error in result.Errors)
            {
                ModelState.AddModelError("", error);
            }
        }

        private bool HasPassword()
        {
            var user = UserManager.FindById(User.Identity.GetUserId());
            if (user != null)
            {
                return user.PasswordHash != null;
            }
            return false;
        }

        private bool HasPhoneNumber()
        {
            var user = UserManager.FindById(User.Identity.GetUserId());
            if (user != null)
            {
                return user.PhoneNumber != null;
            }
            return false;
        }

        public enum ManageMessageId
        {
            AddPhoneSuccess,
            ChangePasswordSuccess,
            SetTwoFactorSuccess,
            SetPasswordSuccess,
            RemoveLoginSuccess,
            RemovePhoneSuccess,
            Error
        }

#endregion
    }
}