using Azure.Core;
using FlexJobApi.Core;
using Furion.DatabaseAccessor;
using Furion.DataEncryption;
using Furion.FriendlyException;
using Mapster;
using MediatR;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace FlexJobApi.UserServer.Application
{
    /// <summary>
    /// 登录命令处理器
    /// </summary>
    public class LoginCommandHandler(
        IRepository<User> rep,
        SmsUtils smsUtils,
        WxmpUtils wxmpUtils) :
        IRequestHandler<PasswordLoginCommand, LoginCommandCallback>,
        IRequestHandler<SmsLoginCommand, LoginCommandCallback>,
        IRequestHandler<WxmpLoginCommand, LoginCommandCallback>,
        IRequestHandler<BindWxmpUserInfoCommand, LoginCommandCallback>,
        IRequestHandler<BindPhoneNumberCommand, bool>
    {
        private readonly IRepository<User> rep = rep;
        private readonly SmsUtils smsUtils = smsUtils;
        private readonly WxmpUtils wxmpUtils = wxmpUtils;

        /// <summary>
        /// 密码登录
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<LoginCommandCallback> Handle(PasswordLoginCommand request, CancellationToken cancellationToken)
        {
            var user = await rep.AsQueryable().AsNoTracking()
                .Where(it => it.UserName == request.UserName && it.Type == request.Type)
                .FirstOrDefaultAsync(cancellationToken);
            if (user == null
                || !PBKDF2Encryption.Compare(request.Password, user.Password))
                throw Oops.Oh(EnumUserErrorCodeType.u1000);
            if (user.Status == EnumUserStatus.Disabled)
                throw Oops.Oh(EnumUserErrorCodeType.u1001);
            return GetCurrentLogier(user, request.ClientType);
        }

        /// <summary>
        /// 短信登录
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<LoginCommandCallback> Handle(SmsLoginCommand request, CancellationToken cancellationToken)
        {
            await smsUtils.CheckVerifyCode(new CheckVerifyCodeModel
            {
                PhoneNumber = request.PhoneNumber,
                VerifyCode = request.VerifyCode,
                TemplateCode = EnumSmsTemplateCode.LoginOrRegister
            });
            var user = await rep.AsQueryable().AsNoTracking()
                .Where(it => it.UserName == request.PhoneNumber && it.Type == request.Type)
                .FirstOrDefaultAsync(cancellationToken);
            if (user == null && request.Type == EnumUserType.Personal)
            {
                user = new User
                {
                    Type = request.Type,
                    UserName = request.PhoneNumber,
                    PhoneNumber = request.PhoneNumber,
                    IsCheckPhoneNumber = true,
                    Level = 1,
                    Status = EnumUserStatus.Normal
                };
                await rep.InsertAsync(user);
            }
            if (user == null)
                throw Oops.Oh(EnumUserErrorCodeType.u1000);
            if (user.Status == EnumUserStatus.Disabled)
                throw Oops.Oh(EnumUserErrorCodeType.u1001);
            return GetCurrentLogier(user, request.ClientType);
        }

        /// <summary>
        /// 微信小程序登录
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<LoginCommandCallback> Handle(WxmpLoginCommand request, CancellationToken cancellationToken)
        {
            var snsJscode2session = await wxmpUtils.SnsJscode2sessionAsync(request.Type, request.Code, cancellationToken);
            var user = await rep.AsQueryable().AsNoTracking()
                .Where(it => it.WxmpOpenId == snsJscode2session.openid && it.Type == request.Type)
                .FirstOrDefaultAsync(cancellationToken);
            if (user == null && request.Type == EnumUserType.Personal)
            {
                user = new User
                {
                    Type = request.Type,
                    UserName = snsJscode2session.openid,
                    WxmpOpenId = snsJscode2session.openid,
                    Level = 1,
                    Status = EnumUserStatus.Normal
                };
                await rep.InsertAsync(user);
            }
            if (user == null)
                throw Oops.Oh(EnumUserErrorCodeType.u1000);
            if (user.Status == EnumUserStatus.Disabled)
                throw Oops.Oh(EnumUserErrorCodeType.u1001);
            return GetCurrentLogier(user, EnumClientType.Wxmp);
        }

        /// <summary>
        /// 绑定手机号
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<bool> Handle(BindPhoneNumberCommand request, CancellationToken cancellationToken)
        {
            await smsUtils.CheckVerifyCode(new CheckVerifyCodeModel
            {
                PhoneNumber = request.PhoneNumber,
                VerifyCode = request.VerifyCode,
                TemplateCode = EnumSmsTemplateCode.LoginOrRegister
            });
            var logier = JwtUtils.GetCurrentLogier();
            var user = await rep.AsQueryable()
                .FirstOrDefaultAsync(it => it.Id == logier.Id);
            if (user == null)
                throw Oops.Oh(EnumErrorCodeType.s404, "当前账号不存在");
            user.UserName = request.PhoneNumber;
            user.PhoneNumber = request.PhoneNumber;
            user.IsCheckPhoneNumber = true;
            return true;
        }

        /// <summary>
        /// 绑定微信小程序用户信息
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        public async Task<LoginCommandCallback> Handle(BindWxmpUserInfoCommand request, CancellationToken cancellationToken)
        {
            var logier = JwtUtils.GetCurrentLogier();
            var user = await rep.AsQueryable()
                .Where(it => it.Type == logier.Type && it.Id == logier.Id)
                .FirstOrDefaultAsync(cancellationToken);
            if (user == null) throw Oops.Oh(EnumErrorCodeType.s404, "当前账号");
            if (user.WxmpOpenId.IsNull()) throw Oops.Oh(EnumUserErrorCodeType.u1100);

            if (user.PhoneNumber.IsNull())
            {
                var result = string.Empty;
                RijndaelManaged rijalg = new RijndaelManaged();
                rijalg.KeySize = 128;
                rijalg.Padding = PaddingMode.PKCS7;
                rijalg.Mode = CipherMode.CBC;
                rijalg.Key = Convert.FromBase64String(request.SessionKey);
                rijalg.IV = Convert.FromBase64String(request.Iv);
                byte[] encryptedData = Convert.FromBase64String(request.EncryptedData);
                ICryptoTransform decryptor = rijalg.CreateDecryptor(rijalg.Key, rijalg.IV);
                using (MemoryStream msDecrypt = new MemoryStream(encryptedData))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {
                            result = srDecrypt.ReadToEnd();
                        }
                    }
                }
                var info = result.JsonTo<BindWxmpUserInfoCommandEncryptedData>();
                if (info == null || info.PhoneNumber.IsNull())
                {
                    throw Oops.Oh(EnumUserErrorCodeType.u1110);
                }

                var bindPhoneNumberUser = await rep.AsQueryable()
                    .Where(it => it.Type == logier.Type && it.PhoneNumber == info.PhoneNumber && it.Id != user.Id)
                    .FirstOrDefaultAsync(cancellationToken);
                if (bindPhoneNumberUser == null)
                {
                    user.PhoneNumber = info.PhoneNumber;
                    user.ContactPhoneNumber = info.PhoneNumber;
                    user.IsCheckPhoneNumber = true;

                    if (user.UserName == user.WxmpOpenId)
                    {
                        user.UserName = info.PhoneNumber;
                    }
                }
                else if (bindPhoneNumberUser.WxmpOpenId.IsNull())
                {
                    bindPhoneNumberUser.WxmpOpenId = user.WxmpOpenId;
                    await rep.DeleteAsync(user);
                    return GetCurrentLogier(bindPhoneNumberUser, EnumClientType.Wxmp);
                }
                else if (bindPhoneNumberUser.WxmpOpenId != user.WxmpOpenId)
                {
                    throw Oops.Oh(EnumUserErrorCodeType.u1120);
                }
            }
            return GetCurrentLogier(user, EnumClientType.Wxmp);
        }

        /// <summary>
        /// 获取当前登录用户
        /// </summary>
        /// <param name="user"></param>
        /// <param name="clientType"></param>
        /// <returns></returns>
        private LoginCommandCallback GetCurrentLogier(User user, EnumClientType clientType)
        {
            var logier = new CurrentLogier
            {
                Id = user.Id,
                Avatar = user.Avatar,
                Name = user.Name,
                UserName = user.UserName,
                PhoneNumber = user.PhoneNumber,
                Level = user.Level,
                Type = user.Type,
                ClientType = clientType,
                EnterpriseId = user.EnterpriseId,
            };
            JwtUtils.GenerateToken(logier);

            return new LoginCommandCallback
            {
                Id = logier.Id,
                AccessToken = logier.AccessToken,
                RefreshToken = logier.RefreshToken,
            };
        }
    }
}