// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.ComponentModel.DataAnnotations;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;

namespace Microsoft.AspNetCore.Identity.UI.V4.Pages.Account.Manage.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>
    [IdentityDefaultUI(typeof(ChangePasswordModel<>))]
    public abstract class ChangePasswordModel : 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; }

        /// <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 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]
            [DataType(DataType.Password)]
            [Display(Name = "Current password")]
            public string OldPassword { 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>
            [Required]
            [StringLength(100, ErrorMessage = "The {0} must be at least {2} and at max {1} characters long.", MinimumLength = 6)]
            [DataType(DataType.Password)]
            [Display(Name = "New password")]
            public string NewPassword { 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>
            [DataType(DataType.Password)]
            [Display(Name = "Confirm new password")]
            [Compare("NewPassword", ErrorMessage = "The new password and confirmation password do not match.")]
            public string ConfirmPassword { 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() => 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() => throw new NotImplementedException();
    }

    internal class ChangePasswordModel<TUser> : ChangePasswordModel where TUser : class
    {
        private readonly UserManager<TUser> _userManager;
        private readonly SignInManager<TUser> _signInManager;
        private readonly ILogger<ChangePasswordModel> _logger;

        public ChangePasswordModel(
            UserManager<TUser> userManager,
            SignInManager<TUser> signInManager,
            ILogger<ChangePasswordModel> logger)
        {
            _userManager = userManager;
            _signInManager = signInManager;
            _logger = logger;
        }

        public override async Task<IActionResult> OnGetAsync()
        {
            var user = await _userManager.GetUserAsync(User);
            if (user == null)
            {
                return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
            }

            var hasPassword = await _userManager.HasPasswordAsync(user);
            if (!hasPassword)
            {
                return RedirectToPage("./SetPassword");
            }

            return Page();
        }

        public override async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }

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

            var changePasswordResult = await _userManager.ChangePasswordAsync(user, Input.OldPassword, Input.NewPassword);
            if (!changePasswordResult.Succeeded)
            {
                foreach (var error in changePasswordResult.Errors)
                {
                    ModelState.AddModelError(string.Empty, error.Description);
                }
                return Page();
            }

            await _signInManager.RefreshSignInAsync(user);
            _logger.LogInformation("User changed their password successfully.");
            StatusMessage = "Your password has been changed.";

            return RedirectToPage();
        }
    }
}
