// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Text;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.WebUtilities;

namespace Microsoft.AspNetCore.Identity.UI.V5.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(ConfirmEmailModel<>))]
public abstract class ConfirmEmailModel : 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>
    [TempData]
    public string? StatusMessage { 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(string userId, string code) => throw new NotImplementedException();
}

internal sealed class ConfirmEmailModel<TUser> : ConfirmEmailModel where TUser : class
{
    private readonly UserManager<TUser> _userManager;

    public ConfirmEmailModel(UserManager<TUser> userManager)
    {
        _userManager = userManager;
    }

    public override async Task<IActionResult> OnGetAsync(string userId, string code)
    {
        if (userId == null || code == null)
        {
            return RedirectToPage("/Index");
        }

        var user = await _userManager.FindByIdAsync(userId);
        if (user == null)
        {
            return NotFound($"Unable to load user with ID '{userId}'.");
        }

        code = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(code));
        var result = await _userManager.ConfirmEmailAsync(user, code);
        StatusMessage = result.Succeeded ? "Thank you for confirming your email." : "Error confirming your email.";
        return Page();
    }
}
