using Apimanager_backend.Config;
using Apimanager_backend.Data;
using Apimanager_backend.Dtos;
using Apimanager_backend.Exceptions;
using Apimanager_backend.Models;
using Apimanager_backend.Tools;
using AutoMapper;
using Microsoft.AspNetCore.Connections.Features;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
using StackExchange.Redis;
using System.ComponentModel;

namespace Apimanager_backend.Services
{
    public class UserService : IUserService
    {
        private readonly ApiContext apiContext;
        private readonly IMapper mapper;
        private readonly ILogger<IUserService> logger;
        private readonly IConnectionMultiplexer redis;
        private readonly IEmailService emailService;
        private readonly int DbSet = 2;
        public UserService(ApiContext apiContext,IMapper automapper,ILogger<IUserService> logger,IConnectionMultiplexer redis,IEmailService emailService)
        {
            this.apiContext = apiContext;
            this.mapper = automapper;
            this.logger = logger;
            this.redis = redis;
            this.emailService = emailService;
        }
        public async Task<UserInfoDto> GetUserAsync(int userId)
        {
            User? user = await apiContext.Users.SingleOrDefaultAsync(x => x.Id == userId);
            //未找到用户
            if (user == null)
            {
                throw new BaseException(2004, "User not found");
            }
            return mapper.Map<UserInfoDto>(user);
        }

        public async Task<bool> IsEmailExist(string email)
        {
            return await apiContext.Users.AnyAsync(x => x.Email == email);
        }

        public async Task<bool> IsUsernameExist(string username)
        {
            return await apiContext.Users.AnyAsync(x => x.Username == username);
        }

        public async Task ResetPasswordAsync(string email, string code, string newPassword)
        {
            //校验验证码
            var db = redis.GetDatabase(DbSet);
            var value = await db.StringGetAsync(email);
            if (!value.HasValue || value.ToString() != code)
            {
                throw new BaseException(5005, "验证码错误");
            }
            //验证成功，开始重置流程
            var user = await apiContext.Users.FirstOrDefaultAsync(x => x.Email == email);
            if(user == null)
            {
                throw new BaseException(2004, "用户不存在");
            }
            //修改密码
            user.PassHash = newPassword;
            apiContext.Users.Update(user);
            await apiContext.SaveChangesAsync();
        }
        #region 发送密码重置邮件
        public async Task SendResetPasswordEmailAsync(string email)
        {
            var randomCode = RandomCodeHelper.GetRandomCodeStr();
            //记录到redis
            var db = redis.GetDatabase(DbSet);
            bool redisSuccess = await db.StringSetAsync(email,randomCode,TimeSpan.FromHours(1));
            if (!redisSuccess)
            {
                throw new BaseException(1005, "Redis Str Set Error");
            }
            string subject = "重置验证码";
            string body = $"您的重置验证码为：{randomCode}<br>有效期60分钟！";
            //发送邮件
            await emailService.SendEmailAsync(email,subject,body);
        }
        #endregion

        public async Task<UserInfoDto> UpdateUserAsync(int userId,UpdateUserDto dto)
        {
            var user = await apiContext.Users.FirstOrDefaultAsync(x => x.Id == userId);
            if (user == null)
            {
                throw new BaseException(2004, "用户不存在");
            }
            user.PassHash = dto.password == null ? user.PassHash : dto.password;

            apiContext.Users.Update(user);
            await apiContext.SaveChangesAsync();
            return mapper.Map<UserInfoDto>(user);
        }
    }
}