using System;
using System.Web.Mvc;
using System.Web.Security;
using MileageTraker.Web.Membership;
using MileageTraker.Web.ViewModels;

namespace MileageTraker.Web.Controllers
{
	[Authorize]
    public class AccountController : Controller
    {
		[AllowAnonymous]
		public ActionResult Login(string returnUrl)
		{
			ViewBag.ReturnUrl = returnUrl;
			return View();
		}

		[HttpPost]
		[AllowAnonymous]
		[ValidateAntiForgeryToken]
		public ActionResult Login(LoginViewModel model, string returnUrl)
		{
			if (ModelState.IsValid && WebSecurity.Login(model.EmailAddress, model.Password, model.RememberMe))
			{
				// TODO: send notification to user
				return RedirectToLocal(returnUrl);
			}

			// If we got this far, something failed, redisplay form
			ModelState.AddModelError("", "The user name or password provided is incorrect.");
			return View(model);
		}

		[HttpPost]
		[ValidateAntiForgeryToken]
		public ActionResult LogOff()
		{
			WebSecurity.Logout();

			// TODO: send notification to user
			return RedirectToAction("Login");
		}

		[AllowAnonymous]
		public ActionResult Register()
		{
			return View();
		}

		[HttpPost]
		[AllowAnonymous]
		[ValidateAntiForgeryToken]
		public ActionResult Register(RegisterModel model)
		{
			if (ModelState.IsValid)
			{
				// Attempt to register the user
				try
				{
					WebSecurity.CreateUserAndAccount(model.UserName, model.Password);
					WebSecurity.Login(model.UserName, model.Password);
					return RedirectToAction("Login");
				}
				catch (MembershipCreateUserException e)
				{
					ModelState.AddModelError("", ErrorCodeToString(e.StatusCode));
				}
			}

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

		public ActionResult Manage(ManageMessageId? message)
		{
			ViewBag.StatusMessage =
				message == ManageMessageId.ChangePasswordSuccess ? "Your password has been changed."
				: message == ManageMessageId.SetPasswordSuccess ? "Your password has been set."
				: message == ManageMessageId.RemoveLoginSuccess ? "The external login was removed."
				: "";
			ViewBag.ReturnUrl = Url.Action("Manage");
			return View();
		}

		[HttpPost]
		[ValidateAntiForgeryToken]
		public ActionResult Manage(ChangePasswordViewModel model)
		{
			ViewBag.ReturnUrl = Url.Action("Manage");

			if (ModelState.IsValid)
			{
				// ChangePassword will throw an exception rather than return false in certain failure scenarios.
				bool changePasswordSucceeded;
				try
				{
					changePasswordSucceeded = WebSecurity.ChangePassword(User.Identity.Name, model.OldPassword, model.NewPassword);
				}
				catch (Exception)
				{
					changePasswordSucceeded = false;
				}

				if (changePasswordSucceeded)
				{
					return RedirectToAction("Manage", new { Message = ManageMessageId.ChangePasswordSuccess });
				}
				else
				{
					ModelState.AddModelError("", "The current password is incorrect or the new password is invalid.");
				}
			}

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

		private ActionResult RedirectToLocal(string returnUrl)
		{
			if (Url.IsLocalUrl(returnUrl))
			{
				return Redirect(returnUrl);
			}
			return RedirectToAction("Index", "Log");
		}

		public enum ManageMessageId
		{
			ChangePasswordSuccess,
			SetPasswordSuccess,
			RemoveLoginSuccess,
		}

		private 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 "User name already exists. Please enter a different user name.";

				case MembershipCreateStatus.DuplicateEmail:
					return "A user name 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.";
			}
		}
    }
}