using Application.Domain.Entities;
using Application.Models;
using Infrastructure.Data;
using Infrastructure.Extensions;
using Infrastructure.Security;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using System;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Security.Claims;

namespace UserCenter.Controllers
{
    [ApiVersion("1.0")]
    [Route("api/v{version:apiVersion}/[controller]/[action]")]
    [ApiController]
    public class TokenController : ControllerBase
    {
        private readonly IConfiguration _cfg;
        private readonly IRepository<User> _userRepo;
        private readonly IEncryptionService _encryptionService;

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

        [HttpPost]
        public ActionResult GetToken([FromBody]LoginModel model)
        {
            var success = false;
            try
            {
                var user = this._userRepo.Table().FirstOrDefault(o => o.UserName == model.UserName);
                if (user == null)
                {
                    return BadRequest(ModelState.AddModelError("用户名或密码错误"));
                }
                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();
                        }
                    }
                    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(model.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);
                                    return BadRequest(ModelState.AddModelError(o => model.UserName, $"用户被锁定,请于{user.LockoutEnd.Value.ToLocalTime().ToString("HH:mm")}后重试", 1));
                                }
                                else
                                {
                                    return BadRequest(ModelState.AddModelError(o => model.UserName, $"密码错误,再错误{maxAccessFailedCount - user.AccessFailedCount}次后将锁定用户{lockoutEndMinutes}分钟", 2));
                                }
                            }
                            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(model.Password, user.SecurityStamp))
                        {
                            return BadRequest(ModelState.AddModelError("用户名或密码错误"));
                        }
                    }
                }
                return Ok(new
                {
                    AccessToken = Request.HttpContext.GetToken(model.UserName, _cfg, DateTime.Now.AddHours(_cfg.GetValue<double>("AccessTokenHours", 0.5))),
                    RefreshToken = Request.HttpContext.GetToken(model.UserName, _cfg, DateTime.Now.AddHours(_cfg.GetValue<double>("RefreshToken", 720))),
                });
            }
            catch (Exception ex)
            {
                ex.PrintStack();
                return Problem(ex.Message);
            }
        }

        [HttpPost]
        public ActionResult RefreshToken([FromBody][Required]string refreshToken)
        {
            try
            {
                var token = Request.HttpContext.ReadToken(refreshToken);
                if (DateTime.UtcNow > token.ValidTo)
                {
                    return Unauthorized(ModelState.AddModelError("已过期"));
                }
                var userName = token.Claims.FirstOrDefault(o => o.Type == ClaimTypes.Name).Value;
                return Ok(new
                {
                    AccessToken = Request.HttpContext.GetToken(userName, _cfg, DateTime.Now.AddHours(_cfg.GetValue<double>("AccessTokenHours", 0.5))),
                    RefreshToken = Request.HttpContext.GetToken(userName, _cfg, DateTime.Now.AddHours(_cfg.GetValue<double>("RefreshToken", 720))),
                });
            }
            catch (Exception ex)
            {
                ex.PrintStack();
                return Problem(ex.Message);
            }
        }
    }
}