// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.ComponentModel.DataAnnotations;
using System.Diagnostics.CodeAnalysis;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;
 
namespace Microsoft.AspNetCore.Identity.UI.V4.Pages.Account.Internal;
 
/// <summary>
///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
///     directly from your code. This API may change or be removed in future releases.
/// </summary>
[AllowAnonymous]
[IdentityDefaultUI(typeof(LoginWith2faModel<>))]
public abstract class LoginWith2faModel : PageModel
{
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    [BindProperty]
    public InputModel Input { get; set; } = default!;
 
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    public bool RememberMe { get; set; }
 
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    public string? ReturnUrl { get; set; }
 
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    public class InputModel
    {
        /// <summary>
        ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
        ///     directly from your code. This API may change or be removed in future releases.
        /// </summary>
        [Required]
        [StringLength(7, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 6)]
        [DataType(DataType.Text)]
        [Display(Name = "Authenticator code")]
        public string TwoFactorCode { get; set; } = default!;
 
        /// <summary>
        ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
        ///     directly from your code. This API may change or be removed in future releases.
        /// </summary>
        [Display(Name = "Remember this machine")]
        public bool RememberMachine { get; set; }
    }
 
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    public virtual Task<IActionResult> OnGetAsync(bool rememberMe, [StringSyntax(StringSyntaxAttribute.Uri)] string? returnUrl = null) => throw new NotImplementedException();
 
    /// <summary>
    ///     This API supports the ASP.NET Core Identity default UI infrastructure and is not intended to be used
    ///     directly from your code. This API may change or be removed in future releases.
    /// </summary>
    public virtual Task<IActionResult> OnPostAsync(bool rememberMe, [StringSyntax(StringSyntaxAttribute.Uri)] string? returnUrl = null) => throw new NotImplementedException();
}
 
internal sealed class LoginWith2faModel<TUser> : LoginWith2faModel where TUser : class
{
    private readonly SignInManager<TUser> _signInManager;
    private readonly UserManager<TUser> _userManager;
    private readonly ILogger<LoginWith2faModel> _logger;
 
    public LoginWith2faModel(
        SignInManager<TUser> signInManager,
        UserManager<TUser> userManager,
        ILogger<LoginWith2faModel> logger)
    {
        _signInManager = signInManager;
        _userManager = userManager;
        _logger = logger;
    }
 
    public override async Task<IActionResult> OnGetAsync(bool rememberMe, string? returnUrl = null)
    {
        // Ensure the user has gone through the username & password screen first
        var user = await _signInManager.GetTwoFactorAuthenticationUserAsync();
 
        if (user == null)
        {
            throw new InvalidOperationException("Unable to load two-factor authentication user.");
        }
 
        ReturnUrl = returnUrl;
        RememberMe = rememberMe;
 
        return Page();
    }
 
    public override async Task<IActionResult> OnPostAsync(bool rememberMe, string? returnUrl = null)
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }
 
        returnUrl = returnUrl ?? Url.Content("~/");
 
        var user = await _signInManager.GetTwoFactorAuthenticationUserAsync();
        if (user == null)
        {
            throw new InvalidOperationException("Unable to load two-factor authentication user.");
        }
 
        var authenticatorCode = Input.TwoFactorCode.Replace(" ", string.Empty).Replace("-", string.Empty);
 
        var result = await _signInManager.TwoFactorAuthenticatorSignInAsync(authenticatorCode, rememberMe, Input.RememberMachine);
 
        await _userManager.GetUserIdAsync(user);
 
        if (result.Succeeded)
        {
            _logger.LogInformation(LoggerEventIds.UserLoginWith2FA, "User logged in with 2fa.");
            return LocalRedirect(returnUrl);
        }
        else if (result.IsLockedOut)
        {
            _logger.LogWarning(LoggerEventIds.UserLockout, "User account locked out.");
            return RedirectToPage("./Lockout");
        }
        else
        {
            _logger.LogWarning(LoggerEventIds.InvalidAuthenticatorCode, "Invalid authenticator code entered.");
            ModelState.AddModelError(string.Empty, "Invalid authenticator code.");
            return Page();
        }
    }
}