package services

import "server/models"

// OperationLogUser 根据操作日志的租户范围解析操作人信息。
// tid 为空或为 0 时，日志来自平台管理员；否则来自租户用户。
func OperationLogUser(tid *uint64, userID uint64) (account, name string) {
	if userID == 0 {
		return "", ""
	}

	if tid != nil && *tid != 0 {
		var user models.SystemTenantUser
		// userID 是令牌里的 identity_id，查老表前先换算成老 uid
		if err := models.Orm.QueryTable(new(models.SystemTenantUser)).
			Filter("tid", *tid).
			Filter("uid", ResolveTenantUID(*tid, userID)).
			One(&user); err == nil {
			if user.Account != nil {
				account = *user.Account
			}
			if user.Name != nil {
				name = *user.Name
			}
		}
		return account, name
	}

	var user models.AdminUser
	if err := models.Orm.QueryTable(new(models.AdminUser)).
		Filter("id", userID).
		One(&user); err == nil {
		account = user.Account
		if user.Name != nil {
			name = *user.Name
		}
	}
	return account, name
}

type operationLogUserKey struct {
	tid uint64
	uid uint64
}

// OperationLogUserResolver 请求级缓存的操作人解析器。
// 日志列表逐行调用 OperationLogUser 时，同一 (tid,userID) 会重复执行
// FindLegacyUID + 用户表查询（N+1），用它按键去重后每个用户只查一次。
type OperationLogUserResolver struct {
	cache map[operationLogUserKey][2]string
}

func NewOperationLogUserResolver() *OperationLogUserResolver {
	return &OperationLogUserResolver{cache: make(map[operationLogUserKey][2]string)}
}

func (r *OperationLogUserResolver) Resolve(tid *uint64, userID uint64) (account, name string) {
	var tidVal uint64
	if tid != nil {
		tidVal = *tid
	}
	key := operationLogUserKey{tid: tidVal, uid: userID}
	if v, ok := r.cache[key]; ok {
		return v[0], v[1]
	}
	account, name = OperationLogUser(tid, userID)
	r.cache[key] = [2]string{account, name}
	return account, name
}