package system

import (
	"errors"
	"strings"

	"git.echol.cn/loser/Go-Web-Template/server/global"
	sysModel "git.echol.cn/loser/Go-Web-Template/server/model/system"
	systemReq "git.echol.cn/loser/Go-Web-Template/server/model/system/request"
	"git.echol.cn/loser/Go-Web-Template/server/utils"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"gorm.io/gorm"
)

type PublicRegisterService struct{}

var PublicRegisterServiceApp = new(PublicRegisterService)

func (s *PublicRegisterService) Register(_ *gin.Context, req systemReq.PublicRegister, mode RegisterMode) error {
	username := strings.TrimSpace(req.Username)
	password := req.Password
	welcome := strings.TrimSpace(req.WelcomePhrase)

	if username == "" || password == "" || welcome == "" {
		return errors.New("参数不完整")
	}
	if len(welcome) > 255 {
		return errors.New("欢迎词过长")
	}

	if mode == RegisterModeInvite && strings.TrimSpace(req.InviteCode) == "" {
		return errors.New("邀请码不能为空")
	}

	return global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		// 用户名唯一校验
		var existed sysModel.SysUser
		if err := tx.Where("username = ?", username).First(&existed).Error; err == nil {
			return errors.New("用户名已注册")
		} else if !errors.Is(err, gorm.ErrRecordNotFound) {
			return err
		}

		user := sysModel.SysUser{
			UUID:          uuid.New(),
			Username:      username,
			Password:      utils.BcryptHash(password),
			NickName:      username,
			WelcomePhrase: welcome,
			AuthorityId:   9528, // 用户已选择：注册用户默认绑定现有 9528 角色
			Enable:        1,
		}
		if err := tx.Create(&user).Error; err != nil {
			return err
		}

		if mode == RegisterModeInvite {
			if _, err := InviteCodeServiceApp.ConsumeByPlainCode(tx, req.InviteCode, user.ID); err != nil {
				return err
			}
		}

		// Authorities 关联：保持与原系统一致，给用户绑定其 AuthorityId 对应角色
		if err := tx.Model(&user).Association("Authorities").Replace([]sysModel.SysAuthority{{AuthorityId: user.AuthorityId}}); err != nil {
			return err
		}
		return nil
	})
}