package router

import (
	"strings"

	"github.com/kami/maven/internal/lexicon"
	"github.com/kami/maven/internal/morph"
)

// A reminder needs something to say at the hour, and the gate that checks for
// one was reading a slot that is never empty.
//
// gateLLMDecision has asked about a subjectless reminder since V-383, on the
// test `d.Slots.Text == ""`. Measured on the box on 05-08-2026: "напомни" alone
// routes to IntentReminder with `Text:напомни`, because fillSlots hands the text
// slot the utterance when the model names nothing narrower. So the slot was
// never empty, the gate never fired, and the turn reached actionReminder and
// answered "не получилось разобрать время напоминания." — a parse error for a
// request she never finished asking about. "ну напомни же" did the same.
//
// The fix is to ask what the text slot CONTAINS rather than whether it is set.
// Two closed classes answer that and no third mechanism is needed: the reminder
// verbs are her own vocabulary (lexicon.ReminderVerbs), and the particles and
// politeness words cannot be the subject of anything (lexicon.IsFillerParticle).
// A verb is matched by lemma through morph.SameWord, so "напоминай" and
// "напомнить" need no entry of their own.
//
// Deliberately NOT reusing cmd/mavend/reminderbody.go, which strips the same
// marker: that function also strips the time words, so "напомни завтра" would
// read as subjectless there. Asking is right when he named no subject, and wrong
// when he named a day — the reminder for tomorrow is the one whose subject she
// should ask about, not one she should treat as noise.

// reminderHasSubject reports whether a reminder's text names anything to say at
// the hour. False for "напомни", "напомни мне", "ну напомни же"; true for
// "напомни позвонить маме" and for "напомни завтра", where the day is a subject
// she can ask nothing better about.
func reminderHasSubject(text string) bool {
	for _, f := range strings.Fields(strings.ToLower(text)) {
		w := strings.Trim(f, " ,.;:!?—-«»\"'()")
		if w == "" || lexicon.IsFillerParticle(w) {
			continue
		}
		if isReminderVerb(w) {
			continue
		}
		return true
	}
	return false
}

// isReminderVerb matches one of her reminder imperatives by lemma. Lemma and not
// prefix: "напоминание" is a noun he can perfectly well ask to be reminded
// about, and a stem test would eat it.
func isReminderVerb(word string) bool {
	for _, v := range lexicon.ReminderVerbs() {
		if word == v || morph.SameWord(word, v) {
			return true
		}
	}
	return false
}