// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using Identity.ExternalClaims.Data;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
 
namespace Identity.ExternalClaims.Pages.Account;
 
public class LoginWithRecoveryCodeModel : PageModel
{
    private readonly SignInManager<ApplicationUser> _signInManager;
    private readonly ILogger<LoginWithRecoveryCodeModel> _logger;
 
    public LoginWithRecoveryCodeModel(SignInManager<ApplicationUser> signInManager, ILogger<LoginWithRecoveryCodeModel> logger)
    {
        _signInManager = signInManager;
        _logger = logger;
    }
 
    [BindProperty]
    public InputModel Input { get; set; }
 
    public string ReturnUrl { get; set; }
 
    public class InputModel
    {
        [BindProperty]
        [Required]
        [DataType(DataType.Text)]
        [Display(Name = "Recovery Code")]
        public string RecoveryCode { get; set; }
    }
 
    public async Task<IActionResult> OnGetAsync(string returnUrl = null)
    {
        // Ensure the user has gone through the username & password screen first
        var user = await _signInManager.GetTwoFactorAuthenticationUserAsync();
        if (user == null)
        {
            throw new ApplicationException($"Unable to load two-factor authentication user.");
        }
 
        ReturnUrl = returnUrl;
 
        return Page();
    }
 
    public async Task<IActionResult> OnPostAsync(string returnUrl = null)
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }
 
        var user = await _signInManager.GetTwoFactorAuthenticationUserAsync();
        if (user == null)
        {
            throw new ApplicationException($"Unable to load two-factor authentication user.");
        }
 
        var recoveryCode = Input.RecoveryCode.Replace(" ", string.Empty);
 
        var result = await _signInManager.TwoFactorRecoveryCodeSignInAsync(recoveryCode);
 
        if (result.Succeeded)
        {
            _logger.LogInformation("User with ID '{UserId}' logged in with a recovery code.", user.Id);
            return LocalRedirect(Url.GetLocalUrl(returnUrl));
        }
        if (result.IsLockedOut)
        {
            _logger.LogWarning("User with ID '{UserId}' account locked out.", user.Id);
            return RedirectToPage("./Lockout");
        }
        else
        {
            _logger.LogWarning("Invalid recovery code entered for user with ID '{UserId}' ", user.Id);
            ModelState.AddModelError(string.Empty, "Invalid recovery code entered.");
            return Page();
        }
    }
}