package common

import (
	"fmt"
	"strconv"

	"laic-backend/logger"

	"github.com/casbin/casbin/v3"
	gormadapter "github.com/casbin/gorm-adapter/v3"
)

var CasbinEnforcer *casbin.Enforcer

// SetUserRole 同步用户在 Casbin 中的角色映射（g 策略），role 为空则清空
func SetUserRole(userID int64, role string) error {
	if CasbinEnforcer == nil {
		return nil
	}
	uid := strconv.FormatInt(userID, 10)
	if _, err := CasbinEnforcer.DeleteRolesForUser(uid); err != nil {
		return err
	}
	if role == "" {
		return nil
	}
	_, err := CasbinEnforcer.AddRoleForUser(uid, role)
	return err
}

func InitCasbinEnforcer() {
	e, err := mysqlCasbin()
	if err != nil {
		logger.ERROR("初始化Casbin失败", err)
		panic(fmt.Sprintf("初始化Casbin失败: %v", err))
	}
	CasbinEnforcer = e
	logger.INFO("初始化Casbin完成")
}

func mysqlCasbin() (*casbin.Enforcer, error) {
	a, err := gormadapter.NewAdapterByDB(DB)
	if err != nil {
		return nil, err
	}
	e, err := casbin.NewEnforcer("casbin.model", a)
	if err != nil {
		return nil, err
	}
	if err = e.LoadPolicy(); err != nil {
		return nil, err
	}
	return e, nil
}