using AutoMapper;
using IM_API.Dtos.Auth;
using IM_API.Dtos.User;
using IM_API.Exceptions;
using IM_API.Interface.Services;
using IM_API.Models;
using IM_API.Tools;
using Microsoft.EntityFrameworkCore;

namespace IM_API.Services
{
    public class AuthService : IAuthService
    {
        private readonly ImContext _context;
        private readonly ILogger<AuthService> _logger;
        private readonly IMapper _mapper;
        private readonly ICacheService _cache;
        public AuthService(ImContext context, ILogger<AuthService> logger, IMapper mapper, ICacheService cache)
        {
            _context = context;
            _logger = logger;
            _mapper = mapper;
            _cache = cache;
        }

        public async Task<User> LoginAsync(LoginRequestDto dto)
        {
            var userinfo = await _cache.GetUserCacheAsync(dto.Username);
            if (userinfo != null && userinfo.Password == dto.Password) return userinfo;
            string username = dto.Username;
            string password = dto.Password;
            var user = await _context.Users.FirstOrDefaultAsync(x => x.Username == username && x.Password == password);
            if(user is null)
            {
                throw new BaseException(CodeDefine.PASSWORD_ERROR);
            }
            await _cache.SetUserCacheAsync(user);
            return user;
        }

        public async Task<UserInfoDto> RegisterAsync(RegisterRequestDto dto)
        {
            string username = dto.Username;
            //用户是否存在
            bool isExist = await _context.Users.AnyAsync(x => x.Username == username);
            if (isExist) throw new BaseException(CodeDefine.USER_ALREADY_EXISTS);
            User user = _mapper.Map<User>(dto);
            _context.Users.Add(user);
            await _context.SaveChangesAsync();
            return _mapper.Map<UserInfoDto>(user);
        }
    }
}