using Apimanager_backend.Data;
using Apimanager_backend.Dtos;
using Apimanager_backend.Exceptions;
using Apimanager_backend.Models;
using Apimanager_backend.Tools;
using AutoMapper;
using Microsoft.EntityFrameworkCore;
using StackExchange.Redis;

namespace Apimanager_backend.Services
{
    public class AuthService:IAuthService
    {
        private readonly ApiContext apiContext;
        private readonly ILogger<IAuthService> logger;
        private readonly IConnectionMultiplexer redis;
        private readonly IEmailService emailService;
        private readonly IMapper mapper;
        private readonly int DbIndex = 1;
        public AuthService(ApiContext apiContext, IMapper automapper,ILogger<AuthService> logger,IConnectionMultiplexer redis,IEmailService emailService)
        {
            this.apiContext = apiContext;
            this.mapper = automapper;
            this.logger = logger;
            this.redis = redis;
            this.emailService = emailService;
        }
        #region 用户登录
        public async Task<UserInfoDto> LoginAsync(string username, string password)
        {
            //查找用户
            User? user = await apiContext.Users.Include(x => x.Roles).SingleOrDefaultAsync(x =>
                x.Username == username && x.PassHash == password
            );

            //用户不存在或密码错误都为登录失败
            if (user == null)
            {
                throw new BaseException(2001, "Invalid username or password");
            }

            //用户被禁用
            if (user.IsBan)
            {
                throw new BaseException(2002, "User account is disabled");
            }

            return mapper.Map<UserInfoDto>(user);
        }
        #endregion
        #region 用户注册
        public async Task<UserInfoDto> RegisterAsync(RegisterRequestDto dto)
        {
            var db = redis.GetDatabase(DbIndex);
            //获取邮箱对应验证码
            var code = await db.StringGetAsync(dto.Email);
            if(!code.HasValue || code.ToString() != dto.VerificationCode)
            {
                throw new BaseException(5005,"验证码错误");
            }
            User user = new User
            {
                Username = dto.Username,
                PassHash = dto.Password,
                Email = dto.Email,
                IsBan = false,
                IsDelete = false,
                Balance = 0,
            };
            try
            {
                //添加新用户
                await apiContext.Users.AddAsync(user);
                await apiContext.SaveChangesAsync();
                UserRole userRole = new UserRole
                {
                    UserId = user.Id,
                    Role = "User"
                };
                await apiContext.UserRoles.AddAsync(userRole);
                await apiContext.SaveChangesAsync();
                return mapper.Map<UserInfoDto>(user);
            }catch(Exception e)
            {
                throw new BaseException(1005,e.Message);
            }
            
        }
        #endregion
        #region 发送注册验证码
        public async Task SendRegisterCodeAsync(string email)
        {
            //生成随机码
            string code = RandomCodeHelper.GetRandomCodeStr();
            string subject = "注册验证码";
            string body = $"您的注册验证码为：{code}<br>有效期60分钟！";
            //随机码写入redis
            var db = redis.GetDatabase(DbIndex);
            bool redisSuccess = await db.StringSetAsync(email,code,TimeSpan.FromHours(1));
            if (!redisSuccess)
            {
                throw new BaseException(1005,"Redis Str Set Error");
            }
            //发送邮件
            await emailService.SendEmailAsync(email,subject,body);
        }
        #endregion
    }
}