package main

import (
	"github.com/kami/maven/internal/dialogue"
	"github.com/kami/maven/internal/router"
)

// The clarify copy deck (Vikunja #457).
//
// Every clarify turn used to say one sentence per gap, and a re-ask repeated
// that sentence word for word. A question he already failed to answer is the
// worst one to ask again unchanged: the second wording is the one that tells
// him which part she missed.
//
// Fixed templates, not model output, for the reason clarifyQuestions has always
// given: the resident model would wander, and a question whose wording changes
// at random is harder to answer than a blunt one. What changes here is that the
// wording varies with the attempt rather than with a die roll — the first ask is
// short, the second names the gap, the third spells it out.
//
// No schema_version, unlike internal/phraser/nudge_templates.go. These are Go
// constants compiled into the daemon, so there is no file that can drift out of
// step with the code that reads it.
//
// Persona holds: infinitive and imperative questions, so there is no gender
// agreement to get wrong, "ты" throughout, and no pet names.
var clarifyQuestionVariants = map[dialogue.Slot][]string{
	dialogue.SlotTime: {
		"Когда?",
		"Во сколько напомнить?",
		"Скажи время — например, «в семь вечера» или «через час».",
	},
	dialogue.SlotText: {
		"О чём напомнить?",
		"Что сказать тебе в это время?",
		"Скажи одной фразой, о чём напомнить.",
	},
	dialogue.SlotKey: {
		"Что записать?",
		"Что именно отметить?",
		"Назови, что записать — например, «выпил воды».",
	},
	dialogue.SlotFn: {
		"Что сделать?",
		"Какое действие выполнить?",
		"Назови действие — я умею только то, что ты мне разрешил.",
	},
}

// clarifyQuestionFor picks the wording for this attempt. attempt is 1-based, as
// PendingQuestion.Attempts counts it; anything past the list uses the last and
// most explicit phrasing rather than wrapping round to the short one, because
// wrapping would ask the same short question he has already not answered.
//
// Deterministic on purpose, unlike clarifyExpiredLine: an expiry notice is the
// same statement however it is worded, and a re-ask is not.
func clarifyQuestionFor(slot dialogue.Slot, attempt int) (string, bool) {
	variants, ok := clarifyQuestionVariants[slot]
	if !ok || len(variants) == 0 {
		return "", false
	}
	i := attempt - 1
	if i < 0 {
		i = 0
	}
	if i >= len(variants) {
		i = len(variants) - 1
	}
	return variants[i], true
}

// clarifyMissedVariants — she is asking for the whole utterance again, because
// the gate fired on an intent with nothing identifiable to ask about (note,
// query, chat, system are not in wantedSlots).
//
// Rotated like the expiry lines and for the same reason: this is the line he
// hears whenever she misses him completely, so it is a line that repeats, and
// the same sentence every time is what makes a house assistant sound like a
// kiosk. All of them say the same two things — she did not catch it, and he
// should say it again — because the wording may vary and the meaning may not.
var clarifyMissedVariants = []string{
	"Не совсем поняла — скажи, пожалуйста, ещё раз.",
	"Я тебя не разобрала. Повтори, пожалуйста.",
	"Не уловила. Скажи это по-другому?",
	"Прости, не поняла — попробуй сказать иначе.",
}

// clarifyMissedFor picks a wording by the utterance itself, so the same words
// asked twice get the same answer and two different misses sound different.
//
// A hash, not rand: a test that drives an utterance twice must not depend on a
// die roll, and the point of rotating is only that consecutive misses differ.
func clarifyMissedFor(utterance string) string {
	var sum int
	for _, r := range utterance {
		sum += int(r)
	}
	return clarifyMissedVariants[sum%len(clarifyMissedVariants)]
}

// clarifyMissedLine is the canned reply for a clarify decision she cannot turn
// into a question. Returns "" for a decision that is not a clarify, so the
// caller keeps its own reply.
func clarifyMissedLine(dec router.Decision) string {
	if !dec.Clarify {
		return ""
	}
	return clarifyMissedFor(dec.Utterance)
}