using System;
using System.Threading.Tasks;
using System.Web.Http;
using Abp.UI;
using Abp.Web.Models;
using Abp.WebApi.Controllers;
using WePlatform.Api.Models;
using WePlatform.Authorization;
using WePlatform.Authorization.Users;
using WePlatform.MultiTenancy;
using IwbZero;
using IwbZero.Authorization.Base;
using IwbZero.Authorization.Users;
using Microsoft.Extensions.Internal;
using Microsoft.Owin.Security;
using Microsoft.Owin.Security.OAuth;

namespace WePlatform.Api.Controllers
{
    public class AccountController : AbpApiController
    {
        public static OAuthBearerAuthenticationOptions OAuthBearerOptions { get; }

        private readonly LogInManager _logInManager;

        static AccountController()
        {
            OAuthBearerOptions = new OAuthBearerAuthenticationOptions();
        }

        public AccountController(LogInManager logInManager)
        {
            _logInManager = logInManager;
            LocalizationSourceName = IwbZeroConsts.LocalizationSourceName;
        }

        [HttpPost]
        public async Task<AjaxResponse> Authenticate(LoginModel loginModel)
        {
            CheckModelState();

            var loginResult = await GetLoginResultAsync(
                loginModel.UsernameOrEmailAddress,
                loginModel.Password,
                loginModel.TenancyName
                );

            var ticket = new AuthenticationTicket(loginResult.Identity, new AuthenticationProperties());

            var currentUtc = new SystemClock().UtcNow;
            ticket.Properties.IssuedUtc = currentUtc;
            ticket.Properties.ExpiresUtc = currentUtc.Add(TimeSpan.FromMinutes(30));

            return new AjaxResponse(OAuthBearerOptions.AccessTokenFormat.Protect(ticket));
        }

        private async Task<IwbLoginResult<Tenant, User>> GetLoginResultAsync(string usernameOrEmailAddress, string password, string tenancyName)
        {
            var loginResult = await _logInManager.LoginAsync(usernameOrEmailAddress, password, tenancyName);

            switch (loginResult.Result)
            {
                case IwbLoginResultType.Success:
                    return loginResult;
                default:
                    throw CreateExceptionForFailedLoginAttempt(loginResult.Result, usernameOrEmailAddress, tenancyName);
            }
        }

        private Exception CreateExceptionForFailedLoginAttempt(IwbLoginResultType result, string usernameOrEmailAddress, string tenancyName)
        {
            switch (result)
            {
                case IwbLoginResultType.Success:
                    return new ApplicationException("Don't call this method with a success result!");
                case IwbLoginResultType.InvalidUserNameOrEmailAddress:
                case IwbLoginResultType.InvalidPassword:
                    return new UserFriendlyException(L("LoginFailed"), L("InvalidUserNameOrPassword"));
                case IwbLoginResultType.InvalidTenancyName:
                    return new UserFriendlyException(L("LoginFailed"), L("ThereIsNoTenantDefinedWithName{0}", tenancyName));
                case IwbLoginResultType.TenantIsNotActive:
                    return new UserFriendlyException(L("LoginFailed"), L("TenantIsNotActive", tenancyName));
                case IwbLoginResultType.UserIsNotActive:
                    return new UserFriendlyException(L("LoginFailed"), L("UserIsNotActiveAndCanNotLogin", usernameOrEmailAddress));
                case IwbLoginResultType.UserEmailIsNotConfirmed:
                    return new UserFriendlyException(L("LoginFailed"), "Your email address is not confirmed. You can not login"); //TODO: localize message
                default: //Can not fall to default actually. But other result types can be added in the future and we may forget to handle it
                    Logger.Warn("Unhandled login fail reason: " + result);
                    return new UserFriendlyException(L("LoginFailed"));
            }
        }

        protected virtual void CheckModelState()
        {
            if (!ModelState.IsValid)
            {
                throw new UserFriendlyException("Invalid request!");
            }
        }
    }
}