package router

import (
	"regexp"
	"strings"
)

// BareCaptureGrammar — a capture verb with nothing after it is a fact she has
// yet to hear, not a conversation (Vikunja #557).
//
// A bare "запиши" reached the resident model as chat, and the model answered by
// agreeing to something nobody asked for: "Я поняла, теперь я буду говорить
// «записала» или «записала заметку»." It read its own instruction block as the
// subject of the turn. Whatever the routing, that reply is invented.
//
// The route this rule asks for is a fact with no key, which is a gap the clarify
// path already has copy for ("Что записать?"). So the rule does not answer the
// turn — it hands it to the one mechanism that asks.
//
// Wired before TaskCaptureGrammar, whose pattern needs an object, so it can
// never claim this shape. There is nothing to disambiguate: the whole utterance
// is one verb from a closed lexicon.
func BareCaptureGrammar() []Grammar {
	return []Grammar{{
		Name:    "bare-capture",
		Pattern: bareCapturePattern,
		Build:   bareCaptureBuild,
	}}
}

// Anchored at both ends, so only the verb and punctuation are in the utterance.
// Trailing "-ка" and "пожалуйста" are the same request said politely.
var bareCapturePattern = regexp.MustCompile(`(?i)^\s*([\p{L}]+)(?:-ка)?[,\s]*(?:пожалуйста)?[\s.!?]*$`)

func bareCaptureBuild(m []string) (Decision, bool) {
	word := strings.ToLower(strings.TrimSpace(m[1]))
	for _, v := range captureVerbs {
		if word != v {
			continue
		}
		// No key, no text: she was told to record and not what. Confidence is
		// 1.0 about the shape, which is all stage 0 ever claims — the gap is
		// carried by the empty slots, not by a doubt.
		return Decision{
			Stage:      0,
			Intent:     IntentFact,
			Confidence: 1.0,
		}, true
	}
	return Decision{}, false
}