using Application.Domain.Entities;
using IdentityServer4.Models;
using IdentityServer4.Validation;
using Infrastructure.Data;
using Infrastructure.Security;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;

namespace UserCenter
{
    public class ResourceOwnerValidator : IResourceOwnerPasswordValidator
    {
        private readonly IConfiguration _cfg;
        private readonly IRepository<User> _userRepo;
        private readonly IEncryptionService _encryptionService;

        public ResourceOwnerValidator(IConfiguration cfg, IRepository<User> userRepo, IEncryptionService encryptionService)
        {
            this._cfg = cfg;
            this._userRepo = userRepo;
            this._encryptionService = encryptionService;
        }

        public Task ValidateAsync(ResourceOwnerPasswordValidationContext context)
        {
            //var userName = context.UserName;
            //var password = context.Password;
            //try
            //{
            //    var user = this._userRepo.Table().FirstOrDefault(o => o.UserName == userName);
            //    if (user == null)
            //    {
            //        context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, "invalid_credential", new Dictionary<string, object> { { "message", "用户不存在" } });
            //    }
            //    else
            //    {
            //        var maxAccessFailedCount = this._cfg.GetValue<int>("MaxFailedAccessAttemptsBeforeLockout");
            //        var lockoutEndMinutes = this._cfg.GetValue<int>("DefaultAccountLockoutMinutes");

            //        if (user.LockoutEnabled)//对已启用登录锁定的用户，如果当前登录时间超出锁定时间，先解除锁定状态
            //        {
            //            if (user.LockoutEnd.HasValue && DateTime.UtcNow > user.LockoutEnd)
            //            {
            //                user.LockoutEnd = null;
            //                user.AccessFailedCount = 0;
            //                this._userRepo.SaveChanges();
            //            }
            //        }
            //        var success = false;
            //        if (user.LockoutEnabled)//对启用登录锁定的用户进行验证
            //        {
            //            if (user.LockoutEnd.HasValue == false)
            //            {
            //                if (user.PasswordHash == this._encryptionService.CreatePasswordHash(password, user.SecurityStamp))
            //                {
            //                    user.LockoutEnd = null;
            //                    user.AccessFailedCount = 0;
            //                    success = true;
            //                }
            //                else
            //                {
            //                    user.AccessFailedCount += 1;
            //                    if (user.AccessFailedCount >= maxAccessFailedCount)
            //                    {
            //                        user.LockoutEnd = DateTime.UtcNow.AddMinutes(lockoutEndMinutes);
            //                    }
            //                }
            //                this._userRepo.SaveChanges();
            //            }
            //        }
            //        else//对未启用登录锁定的用户进行验证
            //        {
            //            if (user.PasswordHash == this._encryptionService.CreatePasswordHash(password, user.SecurityStamp))
            //            {
            //                success = true;
            //            }
            //        }
            //        if (success)
            //        {
            //            var roles = this._userRepo.ReadOnlyTable().Where(o => o.UserName == userName)
            //                    .SelectMany(o => o.UserRoles)
            //                    .Select(o => o.Role)
            //                    .SelectMany(o => o.RolePermissions)
            //                    .Select(o => o.Permission.Number)
            //                    .ToList();
            //            var claims = new List<Claim> { new Claim("Name", userName) };
            //            claims.AddRange(roles.Select(o => new Claim("Role", o)).ToList());
            //            var claimsPrincipal = new ClaimsPrincipal(new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme, "Name", "Role"));

            //            context.Result = new GrantValidationResult(claimsPrincipal);
            //        }
            //        else
            //        {
            //            if (user.LockoutEnabled && user.LockoutEnd.HasValue)
            //            {
            //                context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, $"用户被锁定,请于{user.LockoutEnd.Value.ToLocalTime().ToString("HH:mm")}后重试");
            //            }
            //            else
            //            {
            //                context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, "密码错误");
            //            }
            //        }
            //    }
            //}
            //catch (Exception ex)
            //{
            //    context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, ex.Message);
            //}

            return Task.CompletedTask;
        }
    }
}