package user

import (
	"context"
	"database/sql"
	stderrors "errors"
	"fmt"
	"os"
	"qnc-server/app/main/api/internal/svc"
	"qnc-server/app/main/api/internal/types"
	"qnc-server/app/main/model"
	"qnc-server/common/xerr"
	"qnc-server/pkg/lzkit/crypto"
	"strings"
	"time"

	"github.com/pkg/errors"
	"github.com/zeromicro/go-zero/core/stores/redis"

	"github.com/zeromicro/go-zero/core/logx"
)

type MobileCodeLoginLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewMobileCodeLoginLogic(ctx context.Context, svcCtx *svc.ServiceContext) *MobileCodeLoginLogic {
	return &MobileCodeLoginLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *MobileCodeLoginLogic) MobileCodeLogin(req *types.MobileCodeLoginReq) (resp *types.MobileCodeLoginResp, err error) {
	secretKey := l.svcCtx.Config.Encrypt.SecretKey
	encryptedMobile, err := crypto.EncryptMobile(req.Mobile, secretKey)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "手机登录, 加密手机号失败: %+v", err)
	}
	// 开发环境下跳过验证码校验
	if os.Getenv("ENV") != "development" {
		// 检查手机号是否在一分钟内已发送过验证码
		redisKey := fmt.Sprintf("%s:%s", "login", encryptedMobile)
		cacheCode, err := l.svcCtx.Redis.Get(redisKey)
		if err != nil {
			if stderrors.Is(err, redis.Nil) {
				return nil, errors.Wrapf(xerr.NewErrMsg("验证码已过期"), "手机登录, 验证码过期: %s", encryptedMobile)
			}
			return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "手机登录, 读取验证码redis缓存失败, mobile: %s, err: %+v", encryptedMobile, err)
		}
		if cacheCode != req.Code {
			return nil, errors.Wrapf(xerr.NewErrMsg("验证码不正确"), "手机登录, 验证码不正确: %s", encryptedMobile)
		}
	}
	var userID string

	// 最多重试3次，每次间隔50ms
	maxRetries := 3
	for i := 0; i < maxRetries; i++ {
		user, findUserErr := l.svcCtx.UserModel.FindOneByMobile(l.ctx, sql.NullString{String: encryptedMobile, Valid: true})
		if findUserErr != nil && findUserErr != model.ErrNotFound {
			return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "手机登录, 读取数据库获取用户失败, mobile: %s, err: %+v", encryptedMobile, err)
		}

		if user != nil {
			// 用户存在
			if user.Disable == 1 {
				return nil, errors.Wrapf(xerr.NewErrCode(xerr.USER_DISABLED), "用户已被封禁")
			}
			userID = user.Id
			break
		}

		// 用户不存在，尝试注册
		l.Infof("手机登录, 用户不存在，尝试注册新用户 (尝试 %d/%d): %s", i+1, maxRetries, encryptedMobile)
		registeredUserID, registerErr := l.svcCtx.UserService.RegisterUser(l.ctx, encryptedMobile)
		if registerErr != nil {
			// 检查是否是并发注册导致的唯一键冲突
			errStr := registerErr.Error()
			if strings.Contains(errStr, "Duplicate entry") && strings.Contains(errStr, "user_auth.unique_type_key") {
				// 并发冲突，等待一小段时间后重试
				l.Infof("手机登录, 检测到并发注册冲突，等待后重试: %s", encryptedMobile)
				if i < maxRetries-1 {
					time.Sleep(50 * time.Millisecond)
					continue
				}
				// 最后一次重试仍然失败，尝试最后一次查询
				user, lastRetryErr := l.svcCtx.UserModel.FindOneByMobile(l.ctx, sql.NullString{String: encryptedMobile, Valid: true})
				if lastRetryErr != nil {
					return nil, errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "手机登录, 并发冲突后重试查询用户失败, mobile: %s, err: %+v", encryptedMobile, lastRetryErr)
				}
				if user == nil {
					return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "手机登录, 重试多次后仍未找到用户, mobile: %s", encryptedMobile)
				}
				userID = user.Id
				l.Infof("手机登录, 并发冲突重试后获取到已注册用户, userId: %s, mobile: %s", userID, encryptedMobile)
			} else {
				return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "手机登录, 自动注册用户失败, mobile: %s, err: %+v", encryptedMobile, registerErr)
			}
		} else {
			userID = registeredUserID
			l.Infof("手机登录, 自动注册用户成功, userId: %s, mobile: %s", userID, encryptedMobile)
			break
		}
	}
	token, err := l.svcCtx.UserService.GeneralUserToken(l.ctx, userID)
	if err != nil {
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "手机登录, 生成token失败 : %s", userID)
	}

	// 获取当前时间戳
	now := time.Now().Unix()
	return &types.MobileCodeLoginResp{
		AccessToken:  token,
		AccessExpire: now + l.svcCtx.Config.JwtAuth.AccessExpire,
		RefreshAfter: now + l.svcCtx.Config.JwtAuth.RefreshAfter,
	}, nil
}