package main

import (
	"context"

	"github.com/kami/maven/internal/phraser"
	"github.com/kami/maven/internal/router"
	"github.com/kami/maven/internal/voice"
)

// llmReplier is the daemon-side wiring around phraser.Replier: it owns the
// deterministic floor, and nothing else. The phrasing itself, the prompt and the
// output parsing live in internal/phraser so the eval can score them (#396).
type llmReplier struct {
	p    *phraser.Replier
	stub *voice.StubReplier
}

func newLLMReplier(c phraser.Completer, block func() string) *llmReplier {
	return &llmReplier{p: phraser.NewReplier(c, block), stub: voice.NewStubReplier()}
}

// Reply never fails: a clarify, a model error and an unusable generation all
// answer from the stub, which is what keeps a turn from breaking on the model.
func (r *llmReplier) Reply(ctx context.Context, d router.Decision) string {
	if d.Clarify {
		// The deck, not the stub's single sentence: a clarify she cannot turn
		// into a question is the line he hears most often when she misses him,
		// and it used to be the same words every time (Vikunja #457). Still no
		// model call — this text has to be right every time, and it is not worth
		// a generation to say something this small.
		return clarifyMissedLine(d)
	}
	if d.Intent == router.IntentFact {
		// A captured fact is confirmed by echoing him, and the model is not
		// asked (V-592). It has nothing to phrase FROM: replyContext hands it
		// "записала факт: water \"drank\"", so every Russian word in the reply
		// was the model's own invention, and on 2026-08-06 that was "Проверила,
		// что ты выпел стакан воды" for "я выпил воды".
		return phraser.FactAck(d.Utterance)
	}
	if d.Intent == router.IntentNote {
		// A successful durable write needs no generation. The resident model
		// answered one live capture with masculine self-reference ("сохранил")
		// despite the prompt; the hand-written line is both faster and a hard
		// persona guarantee on the daemon's reply path (V-721).
		return phraser.Ack(phraser.AckNote, nil)
	}
	out, err := r.p.PhraseReply(ctx, d)
	if err != nil || out == "" {
		return r.stub.Reply(ctx, d)
	}
	// The persona checks, on the live path (personaguard.go). A reply that
	// leaks reasoning or calls him "вы" is worse than a flat one.
	if _, ok := guardSpoken("reply", out); !ok {
		return r.stub.Reply(ctx, d)
	}
	return out
}