package main

import (
	"context"
	"errors"
	"fmt"
	"log"
	"regexp"
	"strings"
	"time"

	"github.com/kami/maven/internal/crawl"
	"github.com/kami/maven/internal/ipc"
	"github.com/kami/maven/internal/memory"
	"github.com/kami/maven/internal/morning"
	"github.com/kami/maven/internal/phraser"
	"github.com/kami/maven/internal/router"
	"github.com/kami/maven/internal/rss"
	"github.com/kami/maven/internal/store"
	"github.com/kami/maven/internal/weather"
)

// queryTurn is the per-turn scratch a chain of query sources shares: the
// decision being answered plus the work an earlier source already paid for
// (the query embedding, the notes it pulled). Sources read and fill it in
// order, so a later source never re-embeds.
type queryTurn struct {
	dec   router.Decision
	vec   []float32
	notes []ipc.Note
}

// querySource — one answer source in the chain actionQuery walks. answer
// returns (reply, true) when this source claims the question, ("", false)
// when it passes to the next one. name is for reading the table, not logged.
//
// A struct of one func rather than an interface: every source is a plain
// method on *reactiveHandler with no state of its own (what state a turn has
// lives in queryTurn), so an interface would mean one empty type per source
// to satisfy it — ceremony for nothing. Same reasoning as confirmResolver in
// confirm.go, and the table then reads like actionHandlers: a flat list of
// method expressions you extend with one line.
type querySource struct {
	name   string
	answer func(*reactiveHandler, context.Context, *queryTurn) (string, bool)
	// dateAware — this source reads the day out of the turn and answers for
	// THAT day. Only such a source may claim a continuation ("а завтра?"),
	// because a continuation is a question about a different day and nothing
	// else. A date-blind source claiming one would answer with today's data
	// under tomorrow's question, which is a wrong answer delivered in a
	// confident voice — the failure mode that took reminder out of
	// continuableIntents (continuation.go).
	//
	// Exactly one source qualifies today, and that is not an oversight in the
	// table: CalendarEvents is the only CoreAPI call that takes a date at all.
	// DayPlan is today-only, CurrentWeather is now-only, and the recall
	// sources search text with no notion of a day. When one of them grows a
	// date parameter, flip its flag here.
	dateAware bool
}

// querySources is the ordered chain actionQuery walks; first source to claim
// answers the turn. THE ORDER IS LOAD-BEARING — see the memory-before-notes
// comment on queryMemory: running the notes-only pass first was #373, and the
// gate was never the bug. Adding a source (Kiwix, RSS, crawler, email) is one
// line here plus its method; where you put the line is the whole decision.
var querySources = []querySource{
	{name: "fact-by-key", answer: (*reactiveHandler).queryFactByKey},
	// Before "calendar" on purpose: both match "…на сегодня", and the plan is
	// the more specific ask (its matcher requires a plan word), so the calendar
	// listing would otherwise swallow it.
	{name: "day-plan", answer: (*reactiveHandler).queryDayPlan},
	// Also before "calendar": "что я обычно делаю по средам?" names a weekday,
	// and the habit question is the more specific one. Its matcher requires a
	// habit marker ("обычно", "каждый", …), so a question about this coming
	// Wednesday still reaches the calendar.
	{name: "habits", answer: (*reactiveHandler).queryHabits},
	// Before "calendar" and before the recall sources: "что мне нужно
	// сделать?" is a question about the task list, and the notes pass would
	// otherwise answer it with whatever note happens to be nearest. Its
	// matcher requires a task noun or an explicit "что … сделать", so a
	// date-bearing question still reaches the calendar.
	{name: "tasks", answer: (*reactiveHandler).queryTasks},
	// Next to "tasks" and for the same reason: "что требует внимания?" is a
	// question about the operational state Praxis holds, and it used to fall
	// through every source to the web search (Vikunja #475). Its matcher needs
	// an attention marker, and it falls through when Praxis is not configured.
	{name: "attention", answer: (*reactiveHandler).queryAttention},
	// Before the recall sources too: "сколько я потратил?" is a question about
	// the money facts the poller wrote, and the notes pass would otherwise
	// answer it from whatever he once said about spending. Its matcher needs a
	// money noun plus an actual ask, so "я потратил весь день" is untouched.
	// Next to "tasks" and for the same reason: "что мне купить?" is a question
	// about the shopping list, and the recall pass would otherwise answer it
	// from an old note about the shop. Its matcher needs an explicit list
	// marker, so "надо бы съездить в магазин" is untouched.
	{name: "list", answer: (*reactiveHandler).queryList},
	{name: "money", answer: (*reactiveHandler).queryMoney},
	// Also above the recall sources: "что я тебе говорил?" is a question about
	// the facts he tapped in, and the notes pass would answer it with whatever
	// note is nearest (Vikunja #456). Its matcher needs both halves of a
	// history phrase and bails out when he names a topic, so "что я говорил
	// про сервер" is still recall.
	{name: "history", answer: (*reactiveHandler).queryHistory},
	// Before the recall sources and before general knowledge: "что нового?" is
	// a question about the feeds she reads, and general knowledge would answer
	// it by inventing news. Its matcher needs a feed noun plus an ask, so
	// "у меня новая лента в инстаграме" is untouched.
	{name: "feeds", answer: (*reactiveHandler).queryFeeds},
	// Before "calendar" and before the recall sources: "что включено дома?" is
	// a question about the house, and the notes pass would otherwise answer it
	// from whatever he once said about the lights. Its matcher needs a house
	// marker plus an ask plus a device word, and it bails out on weather
	// wording, so "какая температура на улице?" still reaches the weather
	// source.
	{name: "home", answer: (*reactiveHandler).queryHome},
	// Next to "home" and for the same reason: "какие устройства в сети?" is a
	// question about the LAN, and the recall pass would otherwise answer it
	// from an old note about the router. Its matcher needs a network word plus
	// an ask plus a device noun, so "интернет не работает" is untouched.
	{name: "network", answer: (*reactiveHandler).queryNetwork},
	{name: "calendar", answer: (*reactiveHandler).queryCalendar, dateAware: true},
	{name: "weather", answer: (*reactiveHandler).queryWeather},
	{name: "embed", answer: (*reactiveHandler).queryEmbed},
	{name: "memory", answer: (*reactiveHandler).queryMemory},
	{name: "notes", answer: (*reactiveHandler).queryNotes},
	// THE BOUNDARY. Everything above answers from his own data; everything
	// below answers from the world's. A question about him that got this far
	// has no answer in his data, and no outside source can supply one, so this
	// stops the walk rather than let the encyclopedia and the model guess.
	{name: "personal", answer: (*reactiveHandler).queryPersonal},
	// The world, read live. Owner's ruling of 2026-08-02: a metasearch hit beats
	// a frozen ZIM, so SearXNG asks before Kiwix does. Nothing of his is at
	// stake by this point — the boundary above already stopped every question
	// about him, and only the query string leaves the box.
	{name: "search", answer: (*reactiveHandler).querySearch},
	// The offline encyclopedia, now the fallback for when the line is down or
	// the search comes back empty. It reads the way it always did; what changed
	// is that it no longer gets first refusal on a world question.
	{name: "kiwix", answer: (*reactiveHandler).queryKiwix},
	// LAST before the model answers from memory, and that position is the whole
	// design (Vikunja #259): everything of his, then the search, then the ZIMs,
	// and only then a page he named. The model does NOT come first: it
	// answers after this, because a URL he said out loud is an instruction and
	// a 1.7B guessing at a page it cannot read is how contents get invented.
	// This source only claims a turn where he named a URL, so it never competes
	// with a local answer.
	{name: "web", answer: (*reactiveHandler).queryWeb},
	{name: "general-knowledge", answer: (*reactiveHandler).queryGeneral},
}

func (h *reactiveHandler) actionQuery(ctx context.Context, dec router.Decision) string {
	t := &queryTurn{dec: dec}
	for _, src := range querySources {
		if dec.Continued && !src.dateAware {
			continue
		}
		if reply, ok := src.answer(h, ctx, t); ok {
			// Which source claimed is the one thing about a query turn that was
			// invisible from outside: /trace is the nudge-rule trace and carries
			// no query-source field, so a wrong answer could not be told from a
			// wrongly-ordered chain (Vikunja #474). Only the name is logged —
			// the utterance and the answer are already on the voice lines above
			// and below this one. The same name goes to the turn's sink when the
			// caller asked for one, so /chat can show it (V-539).
			log.Printf("voice: query claimed by source %q", src.name)
			noteQuerySource(ctx, src.name)
			return reply
		}
	}
	if dec.Continued {
		// The previous question cannot be re-asked for another day. Saying so
		// beats "не знаю", which reads as "no data for tomorrow" when the
		// truth is that she never looked.
		return phraser.Q(phraser.QueryOtherDay, nil)
	}
	return phraser.Q(phraser.QueryUnknown, nil)
}

// queryFactByKey — when the dialogue layer resolved an anaphoric reference to
// a prior fact's key (e.g. "когда я это сделал?" after "запиши что я пил
// воду"), look up the fact's value directly.
func (h *reactiveHandler) queryFactByKey(ctx context.Context, t *queryTurn) (string, bool) {
	dec := t.dec
	if !dec.Slots.HasKey || dec.Slots.Key == "" {
		return "", false
	}
	f, err := h.api.LatestFact(ctx, dec.Slots.Key)
	if err != nil {
		return "", false
	}
	if dec.Slots.HasTime {
		// The query asks about timing — the fact's own timestamp is the
		// answer it's looking for. Format as a natural reply.
		return phraser.Q(phraser.QueryFactWhen, map[string]string{"when": formatTime(f.Ts)}), true
	}
	// General fact reference: describe what we know.
	if dec.Utterance == "" {
		return phraser.Q(phraser.QueryFactValue, map[string]string{"key": dec.Slots.Key, "value": f.Value}), true
	}
	// The utterance still carries the question; fall through to normal RAG
	// with the resolved key in context.
	return "", false
}

// queryDayPlan — "какие планы на сегодня?", "что у меня по плану?", "что
// дальше?" (Vikunja #128). Recites the day: calendar events, pending
// reminders, and every morning checklist item today still has no evidence for,
// including the ones whose window has closed.
//
// Read-only by construction — the plan is assembled and rendered core-side and
// nothing here schedules or announces. "что дальше?" asks for the rest of the
// day, so that phrasing trims what has already passed.
//
// What surface this belongs on is still open, tracked as Vikunja #431 ("Board
// surface: Maven holds the work board, runs the intake form, never argues").
// The spoken recital here is the current answer, not the decided one.
func (h *reactiveHandler) queryDayPlan(ctx context.Context, t *queryTurn) (string, bool) {
	if !router.IsDayPlanQuery(t.dec.Utterance) {
		return "", false
	}
	plan, err := h.api.DayPlan(ctx)
	if err != nil {
		log.Printf("voice: day plan: %v", err)
		return phraser.Q(phraser.QueryFailPlan, nil), true
	}
	if !router.IsRestOfDayQuery(t.dec.Utterance) {
		return plan.Spoken, true
	}
	// Rebuild the pure plan so the rest-of-day rendering is the same code that
	// rendered the whole day — one formatter, one persona.
	p := morning.Plan{Date: plan.Date}
	for _, it := range plan.Items {
		p.Items = append(p.Items, morning.PlanEntry{
			At:        it.At,
			Text:      it.Text,
			Kind:      morning.PlanKind(it.Kind),
			Uncertain: it.Uncertain,
		})
	}
	return p.After(h.now()).FormatRU(), true
}

// habitFactWindow — how many recent SELF facts the behaviour profile is counted
// over. Enough for a season of habits without scanning the whole store on every
// question; the profile is recomputed on read, so the bound is the cost control.
//
// The read is kind-filtered in SQL, and that is the load-bearing part. When this
// was a plain recent-facts read the window was a row budget over every writer,
// and the machine writers dwarf the taps: mavpoll writes a wg_handshake row
// whenever a peer rehandshakes, which is roughly every two minutes per peer, so
// 2000 rows was under three days of history. A weekday habit needs
// memory.MinHabitDays distinct Tuesdays, which such a window can never hold, so
// she answered "по вторникам у меня пока нет ничего постоянного" forever on a
// store with a year of taps in it. Self facts come from voice taps, and he does
// not tap seven hundred times a day.
const habitFactWindow = 2000

// queryHabits — "что я обычно делаю по вторникам?" (Vikunja #254). Counts the
// answer out of the fact log rather than asking the model to summarise a life:
// see internal/memory/behavior.go for why nothing here is generated.
func (h *reactiveHandler) queryHabits(ctx context.Context, t *queryTurn) (string, bool) {
	q, ok := router.ParseHabitQuery(t.dec.Utterance)
	if !ok {
		return "", false
	}
	facts, err := h.api.RecentActiveFactsByKind(ctx, string(store.KindSelf), habitFactWindow)
	if err != nil {
		log.Printf("voice: habits: recent facts: %v", err)
		return phraser.Q(phraser.QueryFailNotes, nil), true
	}
	obs := make([]memory.Observation, 0, len(facts))
	for _, f := range facts {
		obs = append(obs, memory.Observation{At: f.Ts, Key: f.Key, Kind: f.Kind})
	}
	profile := memory.BuildProfile(obs, h.now())
	if q.HasWeekday {
		return profile.FormatWeekdayRU(q.Weekday), true
	}
	if q.Weekend {
		return profile.FormatWeekendRU(), true
	}
	return profile.FormatOverallRU(), true
}

// feedNoteWindow — how many recent FEED notes are scanned, and
// feedReadOut — how many headlines she actually reads back. She summarises the
// top of the pile, she does not recite a river.
const (
	feedNoteWindow = 200
	feedReadOut    = 3
)

// queryFeeds — "что нового в лентах?", "что нового по технологиям?"
// (Vikunja #258).
//
// This is the ONLY way a feed item reaches him. The poller writes notes and
// never speaks; asking is the trigger. If that ever changes, the thing that
// changed is "Maven is not a nag", not a detail of this file.
func (h *reactiveHandler) queryFeeds(ctx context.Context, t *queryTurn) (string, bool) {
	q, ok := router.ParseFeedQuery(t.dec.Utterance)
	if !ok {
		return "", false
	}
	if !h.feedsOn {
		// Claim only when nothing below can read the world. The reason this
		// source used to claim unconditionally was that general knowledge would
		// answer "что нового?" with an invented news bulletin — true, and it
		// stopped being the only alternative on 2026-08-02, when live search
		// took the lead. With SearXNG or the ZIMs configured, "что происходит
		// в новостях про искусственный интеллект?" has a real answer below,
		// and a configuration status is the wrong thing to say instead
		// (Vikunja #474).
		if h.search != nil || h.kiwix != nil {
			return "", false
		}
		return phraser.Q(phraser.QueryFeedsOff, nil), true
	}
	// By source, not the last 200 notes of any kind: a busy day of voice notes
	// used to push the newest headline out of the window, and she answered "в
	// лентах пока ничего нового" while the poller was working fine.
	notes, err := h.api.RecentNotesFromSource(ctx, rss.SourcePrefix, feedNoteWindow)
	if err != nil {
		log.Printf("voice: feeds: recent notes: %v", err)
		return phraser.Q(phraser.QueryFailFeeds, nil), true
	}
	var picked []string
	for _, n := range notes {
		if !router.CategoryMatches(rss.NoteCategory(n.Text), q.Category) {
			continue
		}
		// The note carries title, summary, category tag and link; she reads the
		// title alone. The tag is for the match above, and piper reads brackets
		// out loud.
		picked = append(picked, rss.NoteHeadline(n.Text))
		if len(picked) == feedReadOut {
			break
		}
	}
	if len(picked) == 0 {
		if q.Category != "" {
			return phraser.Q(phraser.QueryFeedsTopic, nil), true
		}
		return phraser.Q(phraser.QueryFeedsEmpty, nil), true
	}
	return phraser.Q(phraser.QueryFeedsNew, map[string]string{"items": strings.Join(picked, "; ")}), true
}

// queryCalendar — "что у меня сегодня?", "планы на завтра?"
// h.now(), not time.Now(): the handler's clock is the injected one, so this
// source can be tested at a fixed time like the rest.
func (h *reactiveHandler) queryCalendar(ctx context.Context, t *queryTurn) (string, bool) {
	// A day word is all this source matches on, so any question that merely
	// names a day reached it first. "какая сегодня погода в Москве?" answered
	// "на 02.08.2026 ничего нет." (Vikunja #474). Weather is asked about a day
	// far more often than the calendar is, and the weather source sits right
	// below, so the calendar steps aside on weather wording — the same bail-out
	// queryHome already does for the same reason.
	if isWeatherQuery(t.dec.Utterance) {
		return "", false
	}
	date, ok := router.ParseCalendarDate(t.dec.Utterance, h.now())
	if !ok {
		return "", false
	}
	events, err := h.api.CalendarEvents(ctx, date, date.Add(24*time.Hour))
	if err != nil {
		log.Printf("voice: calendar events: %v", err)
		return phraser.Q(phraser.QueryFailCalendar, nil), true
	}
	// Provenance travels with each event. A work meeting relayed off a phone
	// notification (source ambient:notif, #126) is stored below full confidence
	// and gets hedged; a CalDAV read is recited plainly.
	entries := make([]router.CalendarEntry, len(events))
	for i, e := range events {
		entries[i] = router.CalendarEntry{Text: e.Value, Uncertain: e.Confidence < 1.0}
	}
	var f router.CalendarEventFormatter
	return f.FormatEntries(entries, date), true
}

// queryHome answers a question about the house. Read-only by construction: it
// calls States and nothing else, so there is no confirm turn here — the only
// way to CHANGE something is an enabled allowlist row through tool.Executor.
func (h *reactiveHandler) queryHome(ctx context.Context, t *queryTurn) (string, bool) {
	if !h.turnIsAbout(ctx, t, topicHome, isHomeQuery) {
		return "", false
	}
	if h.home == nil {
		// Fall through rather than claim the turn. A capability that is off
		// must not change what an unconfigured box answers: "какая температура
		// в доме?" on a Maven with no smarthome block reached recall before
		// this source existed, and a stored fact is a better answer than
		// "дом не подключён" from a house that was never configured. The
		// unreachable case is different and homeSummary covers it.
		return "", false
	}
	ctxH, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()
	return h.home.homeSummary(ctxH)
}

// queryNetwork answers a question about the LAN with a bounded scan. There is
// no confirm turn because nothing is changed, and no way to widen the range
// because Scan takes no target — the utterance selects the question, never the
// subnet.
func (h *reactiveHandler) queryNetwork(ctx context.Context, t *queryTurn) (string, bool) {
	if !h.turnIsAbout(ctx, t, topicNetwork, isNetworkQuery) {
		return "", false
	}
	if h.netscan == nil {
		// The recogniser already matched, so this is a question about HIS LAN
		// and there is no scanner to answer it. Falling through sent it to the
		// search leg, which answered with a paragraph about routers in general
		// and put his network question on an upstream engine (Vikunja #479).
		// A missing capability names itself.
		return phraser.Q(phraser.QueryNetOff, nil), true
	}
	return h.netscan.scanSummary(ctx)
}

func (h *reactiveHandler) queryWeather(ctx context.Context, t *queryTurn) (string, bool) {
	if !h.turnIsAbout(ctx, t, topicWeather, isWeatherQuery) {
		return "", false
	}
	loc := extractWeatherLocation(t.dec.Utterance, h.weatherLocation)
	if loc == "" {
		// He named no city and voice.weather.default_location is unset. Saying
		// so is the only honest answer; picking a city would be inventing one.
		return phraser.Q(phraser.QueryWeatherWhere, nil), true
	}
	ctxWT, cancel := context.WithTimeout(ctx, 5*time.Second)
	defer cancel()
	w, err := h.weatherProvider.CurrentWeather(ctxWT, loc)
	if errors.Is(err, weather.ErrNotConfigured) {
		return phraser.Q(phraser.QueryWeatherOff, nil), true
	}
	if errors.Is(err, weather.ErrLocationUnknown) {
		// He named a place and the geocoder does not have it. Saying so beats
		// reading out the default city's temperature (Vikunja #421).
		return "не знаю такого города — " + loc + ".", true
	}
	if err != nil {
		log.Printf("voice: weather: %v", err)
		return phraser.Q(phraser.QueryFailWeather, nil), true
	}
	return phraser.Q(phraser.QueryWeatherNow, map[string]string{
		"location":  w.Location,
		"temp":      fmt.Sprintf("%.0f", w.Temperature),
		"word":      phraser.Degrees(w.Temperature),
		"condition": w.Condition,
	}), true
}

// queryEmbed isn't an answer source — it's the shared cost the two recall
// sources below both need, run once, in the position it always ran in. It
// only claims the turn when the embedder fails.
func (h *reactiveHandler) queryEmbed(ctx context.Context, t *queryTurn) (string, bool) {
	vec, err := router.EmbedQuery(ctx, h.recall.embedder, t.dec.Utterance)
	if err != nil {
		log.Printf("voice: embed query: %v", err)
		return phraser.Q(phraser.QueryFailAnswer, nil), true
	}
	t.vec = vec
	return "", false
}

// queryMemory — long-term memory first: ONE search over everything Maven
// remembers (notes and facts share this index) and ONE confidence gate, so
// the memory that is clearly the best match answers — a note just as much as
// a fact.
//
// This used to run only after the notes-only source below had already
// rejected the same note at the same score, which no note could ever survive
// a second time: the branch could only return a fact (#373). Order, not the
// gate, was the bug — the set of questions Maven answers is unchanged, only
// which memory gets to answer them.
func (h *reactiveHandler) queryMemory(ctx context.Context, t *queryTurn) (string, bool) {
	if h.recall.memStore == nil {
		return "", false
	}
	hits, herr := h.recall.memStore.Search(ctx, t.vec, 3)
	if herr != nil {
		log.Printf("voice: memory search: %v", herr)
		return "", false
	}
	hit, ok := bestRecall(hits, h.recall.minScore, h.recall.minMargin)
	if !ok {
		return "", false
	}
	text := hit.Meta["text"]
	// The score cleared the gate and the topic still has to match (#470). A
	// note about his slow network scored high enough to answer "почему небо
	// синее?", because the right-note and must-be-silent score ranges overlap
	// and no threshold sits between them.
	if !memory.RecallAllowed(t.dec.Utterance, text) {
		log.Printf("voice: recall %q rejected for %q: a world question and no shared topic word", text, t.dec.Utterance)
		return "", false
	}
	// A note is phrased in Maven's voice; a fact is read back as it was
	// stored.
	if hit.Meta["type"] == "note" {
		reply, perr := h.phraser.PhraseQuery(ctx, t.dec.Utterance, []string{text})
		switch {
		case perr != nil:
			// Reading the note back verbatim beats the phraser's own fallback,
			// which only wraps the same text in "вот что я нашла:".
			log.Printf("voice: recall phrase: %v", perr)
		case reply != "":
			return reply, true
		}
	}
	return text, true
}

// queryNotes — notes-only pass, for notes the vector index above does not
// hold (an older note written before it existed). Same gate, notes-only
// candidates.
//
// Confidence gate: below it, say "I don't know" rather than read back the
// least-unrelated note — a confident wrong recall is worse than a gap (spec's
// "not a guesser-of-truth"). Same instinct as the loop's since(key)==null →
// don't fire. Two parts: an absolute cosine floor, and a margin over the
// runner-up, which is the part that works with the e5 embedder's narrow score
// band. See memory.Confident. Failing the gate passes the turn on to general
// knowledge, which is what "don't read back the runner-up" means here.
func (h *reactiveHandler) queryNotes(ctx context.Context, t *queryTurn) (string, bool) {
	notes, err := h.api.QueryNotes(ctx, t.vec, 5)
	if err != nil {
		log.Printf("voice: query notes: %v", err)
		return phraser.Q(phraser.QueryFailAnswer, nil), true
	}
	t.notes = notes
	noteScores := make([]float64, len(notes))
	for i, n := range notes {
		noteScores[i] = n.Score
	}
	if !memory.ConfidentScores(noteScores, h.recall.minScore, h.recall.minMargin) {
		return "", false
	}
	// Same topic veto as queryMemory above: the best note must be about what
	// he asked, not merely the nearest vector in the index.
	if !memory.RecallAllowed(t.dec.Utterance, notes[0].Text) {
		log.Printf("voice: note %q rejected for %q: a world question and no shared topic word", notes[0].Text, t.dec.Utterance)
		return "", false
	}
	texts := make([]string, len(notes))
	for i, n := range notes {
		texts[i] = n.Text
	}
	reply, err := h.phraser.PhraseQuery(ctx, t.dec.Utterance, texts)
	if err != nil {
		log.Printf("voice: phrase query: %v", err)
	}
	if reply == "" {
		reply = phraser.Q(phraser.QueryFound, map[string]string{"text": texts[0]})
	}
	return reply, true
}

// webPageContextRunes — how much of a fetched page is handed to the phraser.
// Less than the crawler keeps: the rest of the 4096-token window belongs to the
// prompt, the persona block and the reply.
const webPageContextRunes = 1500

// queryWeb — "посмотри https://example.org/x — что там?" (Vikunja #259).
//
// It claims a turn ONLY when he named a URL, which is what keeps a fallback from
// becoming a habit: no URL, no fetch, and the model answers from what is local.
// What leaves the box is the URL and nothing else — no note, no fact, no history
// travels with it.
func (h *reactiveHandler) queryWeb(ctx context.Context, t *queryTurn) (string, bool) {
	link, ok := router.FirstURL(t.dec.Utterance)
	if !ok {
		return "", false
	}
	if h.crawler == nil {
		// He named a URL, so the question is about that page and nothing else
		// can answer it. The older comment here argued for falling through and
		// letting the model answer as if the URL had not been said; that is a
		// guess dressed as an answer (Vikunja #479).
		return phraser.Q(phraser.QueryPageOff, nil), true
	}
	ctxFetch, cancel := context.WithTimeout(ctx, 30*time.Second)
	defer cancel()
	page, err := h.crawler.Page(ctxFetch, link)
	if err != nil {
		if errors.Is(err, crawl.ErrRobots) {
			return phraser.Q(phraser.QueryPageBlocked, nil), true
		}
		log.Printf("voice: web: %v", err)
		return phraser.Q(phraser.QueryFailPage, nil), true
	}
	if page.Text == "" {
		return phraser.Q(phraser.QueryPageEmpty, nil), true
	}
	// The page is handed to the phraser the same way a note is: as context for
	// the question he actually asked. She answers the question, she does not
	// recite the page.
	snippet := page.Title + "\n" + crawl.TrimRunes(page.Text, webPageContextRunes)
	reply := h.phraseSource(ctx, "web", t.dec.Utterance, []string{snippet})
	if reply == "" {
		// No phraser (or it failed): read back the top of the page rather than
		// pretend the fetch did not happen.
		return phraser.Q(phraser.QueryPageText, map[string]string{"text": crawl.TrimRunes(page.Text, 300)}), true
	}
	return reply, true
}

// kiwixTimeout — the whole ZIM source, rewrite included. The rewrite is one
// short constrained completion and the search is a LAN request; if the pair
// takes longer than this something is wrong and he is better served by the
// model's own answer than by more waiting.
const kiwixTimeout = 20 * time.Second

// searchTimeout — the whole metasearch source. websearch.Client already holds a
// per-request timeout from config; this is the outer bound on the turn, so a
// hung dial cannot outlive it either. Shorter than kiwixTimeout because there
// is no rewrite call in front of it: the question goes out verbatim.
const searchTimeout = 12 * time.Second

// querySearch — the live web, through a self-hosted SearXNG.
//
// Ahead of Kiwix by the owner's ruling of 2026-08-02: a search reads what is
// true today, a ZIM reads what was true when it was built, and the ZIM is the
// fallback for a box with no line out. Everything of his still answers first —
// the personal boundary is directly above this source, so a question ABOUT him
// never becomes a query.
//
// What leaves this process is the query string and nothing else. His notes, his
// facts, the persona block and the history do not travel with it: the websearch
// package cannot read the store. That is the CLAUDE.md rule made mechanical,
// not a promise about how the prompt is assembled.
//
// It claims the turn only when the search returns something. An empty result,
// an unreachable instance and a 403 from an instance without the JSON format
// all fall through to Kiwix, which is the point of the ordering.
func (h *reactiveHandler) querySearch(ctx context.Context, t *queryTurn) (string, bool) {
	if h.search == nil {
		// Off unless configured, same as the crawler and the ZIMs. Nothing is
		// said about it: he never asked for a capability he did not enable.
		return "", false
	}
	ctxS, cancel := context.WithTimeout(ctx, searchTimeout)
	defer cancel()

	// Verbatim. No rewriter: SearXNG ranks by meaning through real engines, and
	// reducing "почему небо голубое" to English keywords would throw away the
	// language he asked in along with the ranking that handles it.
	resp, err := h.search.client.Search(ctxS, t.dec.Utterance, h.search.max)
	if err != nil {
		log.Printf("voice: search %q: %v", t.dec.Utterance, err)
		return "", false
	}
	if resp.Empty() {
		return "", false
	}
	// Logged on the way through, not only on failure. Without this there is no
	// telling from the outside whether an answer came off the web, off a ZIM or
	// out of the model's weights, and those are the cases worth telling apart.
	log.Printf("voice: search: %q → %d answers, %d results", t.dec.Utterance, len(resp.Answers), len(resp.Results))

	// Handed over the same way a note, a page or an article is: evidence for the
	// question he asked, not something to recite. The trim is one budget over the
	// joined block, so a long first snippet cannot crowd out the rest.
	evidence := crawl.TrimRunes(strings.Join(resp.Snippets(), "\n"), h.search.runes)
	reply := h.phraseSource(ctx, "search", t.dec.Utterance, []string{evidence})
	if reply == "" {
		// No phraser, or it failed. Read back the best evidence rather than
		// pretend the search did not happen.
		return phraser.Q(phraser.QueryFound, map[string]string{"text": crawl.TrimRunes(resp.Snippets()[0], 300)}), true
	}
	return reply, true
}

// queryKiwix — the offline encyclopedia, and the fallback behind querySearch:
// everything of his has already had its turn and the live search found nothing
// or could not be reached. Reading beats recalling for a 1.7B either way.
//
// What leaves this process is the search query and nothing else. His notes,
// his facts, the persona block and the history do not travel with it — the
// kiwix package cannot read the store. That holds even though the server is on
// the LAN, because "local sources first" is not a licence to widen what a
// lookup is allowed to see.
//
// It claims the turn only when the search returns something. No results is not
// a failure worth announcing: it means the ZIM does not cover this, and the
// model answering next is the better outcome than "ничего не нашла".
func (h *reactiveHandler) queryKiwix(ctx context.Context, t *queryTurn) (string, bool) {
	if h.kiwix == nil {
		// Off unless configured, same as the crawler and the weather. Nothing
		// is said about it: he never asked for a capability he did not enable.
		return "", false
	}
	ctxK, cancel := context.WithTimeout(ctx, kiwixTimeout)
	defer cancel()

	// The ZIMs are English and kiwix ranks by keyword overlap, not meaning, so
	// a Russian sentence matches nothing at all. The rewriter turns it into a
	// handful of English keywords with the resident model.
	pattern := t.dec.Utterance
	if h.kiwix.rewriter != nil {
		q, err := h.kiwix.rewriter.Rewrite(ctxK, t.dec.Utterance)
		if err != nil {
			// Fall through to the verbatim question rather than give up. It
			// will usually miss, and missing is a fall-through too.
			log.Printf("voice: kiwix: rewrite: %v", err)
		} else if q != "" {
			pattern = q
		}
	}

	hits, err := h.kiwix.client.Search(ctxK, pattern, h.kiwix.book, h.kiwix.max)
	if err != nil {
		log.Printf("voice: kiwix: search %q: %v", pattern, err)
		return "", false
	}
	if len(hits) == 0 {
		return "", false
	}
	top := hits[0]
	// Logged on the way through, not only on failure. Without this there is no
	// way to tell from the outside whether an answer came off a ZIM or out of
	// the model's weights, and those are the two cases worth telling apart.
	log.Printf("voice: kiwix: %q → %d hits, top %q", pattern, len(hits), top.Title)

	// The top hit only, read as an article rather than as a snippet. Kiwix
	// builds its snippet from wherever the keyword matched, which on Wikipedia
	// is usually the navigation box at the foot of the page — the first version
	// of this joined three of those and she recited "Ecological economics
	// Ecological footprint …" at him. The head of the article is the lead
	// paragraph, which is the definition the snippet was meant to be.
	page, aerr := h.kiwix.client.Article(ctxK, top.Path, h.kiwix.runes)
	if aerr != nil || page.Text == "" {
		if aerr != nil {
			log.Printf("voice: kiwix: article %s: %v", top.Path, aerr)
		}
		// The search did find something, so fall back to its snippet rather
		// than throw the hit away.
		if top.Snippet == "" {
			return "", false
		}
		page = crawl.Page{Title: top.Title, Text: top.Snippet}
	}
	// Handed over the same way a note or a page is: context for the question he
	// asked, not something to recite.
	snippet := top.Title + "\n" + crawl.TrimRunes(page.Text, h.kiwix.runes)
	reply := h.phraseSource(ctx, "kiwix", t.dec.Utterance, []string{snippet})
	if reply == "" {
		// No phraser, or it failed. Read back the best hit rather than pretend
		// the search did not happen.
		return phraser.Q(phraser.QueryFound, map[string]string{"text": crawl.TrimRunes(top.Title+" — "+page.Text, 300)}), true
	}
	return reply, true
}

// queryPersonal — stop the walk on a question about him that his own data did
// not answer.
//
// Every source above this one reads something of his: his facts, his calendar,
// his tasks, his house, his notes. Everything below reads the world: an offline
// Wikipedia, a page he named, the model's own weights. The world does not know
// when his meeting is, and asked anyway it will produce something.
//
// It did. "во сколько у меня встреча" reached Kiwix on the deployed daemon,
// 01-08-2026; Wikipedia matched an article on the 2015 CPISRA World Games, and
// the phraser rendered it as "встреча у тебя в 2015 CPISRA World Games, где
// были соревнования по плаванию". Fluent, confident, and about a swimming
// competition in Nottingham. Saying "не знаю" is not a worse answer than that
// one — it is the only true one.
//
// Note this is also the privacy edge. The rule in CLAUDE.md is that only the
// utterance may leave the box, never his notes; a question that is ABOUT him
// carries his life in the utterance itself, so it is the one class that should
// not be sent to an upstream engine at all. The guard closes both holes with
// the same test.
func (h *reactiveHandler) queryPersonal(ctx context.Context, t *queryTurn) (string, bool) {
	if !h.isPersonalTurn(ctx, t) {
		return "", false
	}
	log.Printf("voice: %q is about him and his own data did not answer it; not asking the world", t.dec.Utterance)
	return phraser.Q(phraser.QueryPersonalNone, nil), true
}

// personalMarkers — first-person POSSESSION, not first person generally.
//
// "у меня" and "мой" attach to a thing that is his, which is what makes the
// question unanswerable from outside. A bare "мне" or "я" does not: "как мне
// сварить борщ" and "что я могу посмотреть" are ordinary questions about the
// world that happen to mention the asker, and refusing those would be the
// opposite mistake. The narrow test is the point.
// Go's \b is ASCII-only and never fires next to a Cyrillic letter, so the
// Russian patterns spell the boundary out as "not a letter or a digit". The
// English ones keep \b, where it works.
var personalMarkers = []*regexp.Regexp{
	regexp.MustCompile(`(?i)(^|[^\p{L}\p{N}])у\s+меня([^\p{L}\p{N}]|$)`),
	regexp.MustCompile(`(?i)(^|[^\p{L}\p{N}])мо(й|я|ё|е|и|его|ей|их|им|ими|ем|ю|ею)([^\p{L}\p{N}]|$)`),
	regexp.MustCompile(`(?i)\bmy\b`),
	regexp.MustCompile(`(?i)\bdo\s+i\s+have\b`),
	regexp.MustCompile(`(?i)\bdid\s+i\b`),
}

// isPersonalQuery — the offline floor under the boundary. Possession only, and
// deliberately still narrow: it answers when there is no embedder to ask, and a
// broad guess made blind is worse than a narrow one.
func isPersonalQuery(utterance string) bool {
	if utterance == "" {
		return false
	}
	for _, re := range personalMarkers {
		if re.MatchString(utterance) {
			return true
		}
	}
	return false
}

// isPersonalTurn — the boundary test. The seeds decide when the embedder is
// there, which is every deployed box; the possession markers are the floor
// underneath, for a handler with no embedder or a turn whose vector never got
// computed. Same shape as the cascade: the better test leads, the offline one
// always answers.
func (h *reactiveHandler) isPersonalTurn(ctx context.Context, t *queryTurn) bool {
	h.recall.boundary.load(ctx, h.recall.embedder)
	if personal, world, ok := h.recall.boundary.score(t.vec); ok {
		if personal > world {
			log.Printf("voice: %q scores personal %.4f vs world %.4f", t.dec.Utterance, personal, world)
			return true
		}
		return false
	}
	return isPersonalQuery(t.dec.Utterance)
}

// queryGeneral — general knowledge, the last source before giving up. It always
// claims: either a model answers, or Maven names the gap, or she says she does
// not know.
//
// This is the sharpest case for the naming half. Nothing has been fetched, so
// there is no passage to fall back on and no floor under the answer except the
// model's weights — and a 1.7B's weights are where the invented answers come
// from. With a workstation configured and asleep he is told that, rather than
// told something false in a confident voice. With no workstation configured at
// all the resident model answers exactly as it does today: naming a gap requires
// a gap, and on that box the 1.7B is the whole product.
func (h *reactiveHandler) queryGeneral(ctx context.Context, t *queryTurn) (string, bool) {
	if h.phraser == nil {
		// No model of any size. That is not the workstation being asleep, so it
		// is not that gap: it is simply not knowing.
		return phraser.Q(phraser.QueryUnknown, nil), true
	}
	reply, err := h.phraseWorld(ctx, t.dec.Utterance, nil)
	if errors.Is(err, phraser.ErrNoWorldModel) {
		log.Printf("voice: %q needs the world model and it is not available", t.dec.Utterance)
		return worldGap(), true
	}
	if err != nil || reply == "" {
		return phraser.Q(phraser.QueryUnknown, nil), true
	}
	return reply, true
}