package controllogic

import "strings"

// Dialog is a user-facing notification or input request emitted by an
// action.dialog node. It is delivered to connected clients whose identity
// matches Users/Groups (both empty = everyone). For an "input" dialog the
// client's response is written back to Target (a "ds:name" reference, e.g.
// "srv:approved") so control logic can read it on a later activation.
type Dialog struct {
	ID      string   `json:"id"`
	Kind    string   `json:"kind"` // "info" | "error" | "input"
	Title   string   `json:"title"`
	Message string   `json:"message"`
	Target  string   `json:"target,omitempty"`
	Users   []string `json:"users,omitempty"`
	Groups  []string `json:"groups,omitempty"`
}

// Notifier delivers control-logic dialogs to connected clients. The server
// implements it; the engine calls Notify when an action.dialog node runs.
// Notify must not block (the hub fans out without waiting on slow clients).
type Notifier interface {
	Notify(Dialog)
}

// splitCSV parses a comma-separated user/group filter into trimmed,
// non-empty tokens. An empty string yields a nil slice (no filter).
func splitCSV(s string) []string {
	var out []string
	for _, p := range strings.Split(s, ",") {
		if t := strings.TrimSpace(p); t != "" {
			out = append(out, t)
		}
	}
	return out
}