using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text.Encodings.Web;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.WebUtilities;

using Amazon.AspNetCore.Identity.Cognito;
using Amazon.Extensions.CognitoAuthentication;

namespace Samples.Areas.Identity.Pages.Account
{
    [AllowAnonymous]
    public class ForgotPasswordModel : PageModel
    {
        private readonly CognitoUserManager<CognitoUser> _userManager;

        public ForgotPasswordModel(UserManager<CognitoUser> userManager)
        {
            _userManager = userManager as CognitoUserManager<CognitoUser>;
        }

        [BindProperty]
        public InputModel Input { get; set; }

        public class InputModel
        {
            [Required]
            [EmailAddress]
            public string Email { get; set; }
        }

        public async Task<IActionResult> OnPostAsync()
        {
            if (ModelState.IsValid)
            {
                var user = await _userManager.FindByEmailAsync(Input.Email);
                if (user == null || !(await _userManager.IsEmailConfirmedAsync(user)))
                {
                    // Don't reveal that the user does not exist or is not confirmed
                    return RedirectToPage("./ResetPassword");
                }

                // Cognito will send notification to user with reset token the user can use to reset their password.
                await user.ForgotPasswordAsync();

                return RedirectToPage("./ResetPassword");
            }

            return Page();
        }
    }
}