// Package main is mavend — maven's daemon.
//
// "core = the only key-holder": one process holds the unlocked store + the
// trigger loop; modules are separate processes, key-free, fail-independent.
// the daemon wires Store → Gatherer → Tick → phraser → delivery, runs the 60s
// ticker, owns the cold-start unlock dance, and exposes the CoreAPI boundary
// over a unix socket for modules (router/delivery/poller/...) to call.
//
// Floor (this file): pluggable seams wired with the deterministic Stubs.
//   - phraser Stub (no LLM)
//   - voice sink wired via wireVoice: embedder/classifier seeded with ~10
//     examples across 5 intents; stt + tts stubs in-process by default,
//     remote module sockets when configured; TCP listener on voice.bind.
//     The voice sink (voicesink.Sink via Sessions) is wired into the
//     dispatcher — the reactive path (push-to-talk) AND proactive nudges
//     (care-when-present, sev3/sev4 present) both route through the same
//     stt→router→tts→client pipeline.
//   - auth FloorEnrollment + nil Session — cold-start unlock assumed: today
//     the store opens plain sqlite (sqlcipher deferred). the daemon runs
//     "unlocked" — the locked-until-asserted dance lands with the Session
//     verifier + ask-password transport (open spec item).
//
// Cold-start unlock (2026-07-06):
//
//	When a passkey credential is enrolled AND no env key is set, the daemon
//	starts in LOCKED mode: the IPC server runs but rejects all store methods
//	except MethodAssertStepUp and MethodUnlock. A passkey assertion followed
//	by MethodUnlock (with the same credential's public key) unwraps the at-rest
//	AES-256 key from a wrapped blob on disk (HKDF-SHA256 + AES-GCM) and opens
//	the encrypted store. After unlock, the daemon wires voice, loop, and
//	delivery and runs normally.
//
//	Fallback: when db_key_env is set (or no wrapped file exists), the daemon
//	starts unlocked from the env key (pre-unlock behavior). Enrolling a passkey
//	while unlocked calls MethodStoreEncryptionKey to wrap the env key and
//	persist the wrapped blob — enabling cold-start unlock on the next boot
//	after the env key is removed.
package main

import (
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"log"
	"net"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"

	"github.com/kami/maven/internal/auth"
	"github.com/kami/maven/internal/config"
	"github.com/kami/maven/internal/delivery"
	"github.com/kami/maven/internal/delivery/ntfysink"
	"github.com/kami/maven/internal/delivery/telegramsink"
	"github.com/kami/maven/internal/ipc"
	"github.com/kami/maven/internal/loop"
	"github.com/kami/maven/internal/persona"
	"github.com/kami/maven/internal/phraser"
	"github.com/kami/maven/internal/store"
	"github.com/kami/maven/internal/webauthn"
)

var errLocked = errors.New("mavend: daemon locked — complete passkey assertion first")

// daemonLock tracks whether the daemon is in locked (pre-unlock) mode.
// In locked mode, all CoreAPI methods return errLocked. The unlock path
// replaces the CoreAPI with the real store adapter and flips the flag.
type daemonLock struct {
	mu     sync.Mutex
	locked bool
}

func newDaemonLock(locked bool) *daemonLock {
	return &daemonLock{locked: locked}
}

func (l *daemonLock) isLocked() bool {
	l.mu.Lock()
	defer l.mu.Unlock()
	return l.locked
}

func (l *daemonLock) unlock() {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.locked = false
}

func main() {
	if err := run(os.Args[1:]); err != nil {
		fmt.Fprintln(os.Stderr, "mavend:", err)
		os.Exit(1)
	}
}

func run(args []string) error {
	cfgPath := flag.String("config", defaultConfigPath(), "path to mavend JSON config")
	wrappedKeyPath := flag.String("wrapped-key-file", "", "path to wrapped encryption key blob (enables cold-start unlock)")
	reembed := flag.Bool("reembed", false, "re-embed every stored note and fact with the configured embedder, then serve normally (run once after an embedder swap)")
	flag.CommandLine.Parse(args)
	reembedOnStart = *reembed
	cfg, err := config.Load(*cfgPath)
	if err != nil {
		return err
	}

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
	defer stop()

	// ----- encryption key: env key → wrapped key → plaintext -----
	// Priority: env key (from config/docker) > wrapped key (cold-start unlock) > plaintext (dev/CI).
	// When a wrapped key file exists AND no env key is set, the daemon starts
	// LOCKED and waits for a passkey assertion to unwrap it.
	envKey, err := cfg.DBEncryptionKey()
	if err != nil {
		return err
	}

	wrappedExists := false
	if *wrappedKeyPath != "" {
		if _, err := os.Stat(*wrappedKeyPath); err == nil {
			wrappedExists = true
		} else if !errors.Is(err, os.ErrNotExist) {
			return fmt.Errorf("check wrapped key: %w", err)
		}
	} else {
		// default path alongside the config
		defaultWrapped := cfg.DefaultWrappedKeyPath()
		if _, err := os.Stat(defaultWrapped); err == nil {
			*wrappedKeyPath = defaultWrapped
			wrappedExists = true
		}
	}

	locked := wrappedExists && envKey == nil
	dl := newDaemonLock(locked)

	var st *store.Store
	var envKeyBytes []byte // kept for WrapKeyFn (enrollment wraps this key)

	if !locked {
		// Normal boot: env key or plaintext (dev/CI)
		if envKey != nil {
			envKeyBytes = make([]byte, len(envKey))
			copy(envKeyBytes, envKey)
			st, err = store.OpenEncrypted(ctx, cfg.DBPath, cfg.DBTmpfs, envKey)
		} else {
			st, err = store.Open(ctx, cfg.DBPath)
		}
		if err != nil {
			return fmt.Errorf("open store: %w", err)
		}
		defer st.Close()
	}

	// ----- daemon components (only wired when unlocked) -----
	// Pre-declare so the unlock path can wire them later.
	var (
		gatherer   *loop.Gatherer
		rules      []loop.Rule
		phr        phraser.Phraser
		voiceW     *voiceWiring
		dispatcher *delivery.Dispatcher
		tl         *tickLoop
		coreAPI    ipc.CoreAPI
		eco        *ecosystemWiring
		factWorker *factEnrichmentWorker
		evalWorker *memoryEvalWorker // nil ⇒ memory evaluation off (the default)
	)

	if !locked {
		rules = loop.DefaultRules()
		gatherer = loop.NewGatherer(st, rules)
		if cfg.QuietHours != nil {
			gatherer.SetQuietHours(cfg.QuietHours.Start, cfg.QuietHours.End)
		}

		// phraser
		phr = phraser.NewStub()
		if cfg.Phraser != nil {
			pc := phraser.Config{
				ModelPath:    cfg.Phraser.ModelPath,
				BinPath:      cfg.Phraser.BinPath,
				Listen:       cfg.Phraser.Listen,
				NGpuLayers:   cfg.Phraser.NGpuLayers,
				NCtx:         cfg.Phraser.NCtx,
				Timeout:      time.Duration(cfg.Phraser.Timeout),
				LLMNudges:    cfg.Phraser.LLMNudges,
				ContextBlock: contextBlockFn(cfg, time.Now),
			}
			if pc.BinPath == "" {
				pc.BinPath = "llama-server"
			}
			if pc.Listen == "" {
				pc.Listen = "127.0.0.1:0"
			}
			if pc.NCtx <= 0 {
				pc.NCtx = 2048
			}
			if pc.Timeout <= 0 {
				pc.Timeout = 30 * time.Second
			}
			var err error
			phr, err = phraser.NewLLMPhraser(ctx, pc)
			if err != nil {
				return fmt.Errorf("phraser: %w", err)
			}
		}

		// ecosystem — nexus + hexis + praxis (all over HTTP; no direct DB access)
		eco = wireEcosystem(cfg)

		// voice
		voiceW, err = wireVoice(cfg, ipc.NewStoreAPI(st), phr, st.VectorMemory(), st, eco)
		if err != nil {
			return fmt.Errorf("wire voice: %w", err)
		}

		// delivery
		var ntfy delivery.Sink
		if cfg.Ntfy != nil {
			s, err := ntfysink.New(*cfg.Ntfy)
			if err != nil {
				return fmt.Errorf("wire ntfy sink: %w", err)
			}
			ntfy = s
		}
		var telegram delivery.Sink
		if cfg.Telegram != nil {
			s, err := telegramsink.New(*cfg.Telegram)
			if err != nil {
				return fmt.Errorf("wire telegram sink: %w", err)
			}
			telegram = s
		}
		var voiceSink delivery.Sink
		if voiceW != nil {
			voiceSink = voiceW.voiceSink
		}
		// A crashed prior run may have left "pending" delivery attempts (send
		// may have landed externally, then the process died before recording
		// it) — reconcile them to "unknown" before the tick loop resumes
		// sending, so nothing auto-resends into that ambiguity.
		if _, err := st.ReconcileStaleDeliveryAttempts(context.Background(), time.Now()); err != nil {
			log.Printf("delivery outbox reconcile: %v", err)
		}
		dispatcher = delivery.NewDispatcher(delivery.Config{
			Ntfy:      ntfy,
			Telegram:  telegram,
			Voice:     voiceSink,
			Ack:       st,
			Nudges:    st,
			Reminders: st,
			Outbox:    st,
		})

		// tick loop
		tickInterval := time.Duration(cfg.TickInterval)
		repeatInterval := time.Duration(cfg.RepeatInterval)
		autotuneInterval := time.Duration(cfg.AutotuneInterval)
		tl = newTickLoop(st, gatherer, dispatcher, phr, rules, tickInterval, repeatInterval, autotuneInterval, cfg.Digest, routinesFromConfig(cfg.Routines), config.MorningRoutinesFromConfig(cfg.MorningRoutines), cfg.PatternProposals)
		factWorker = newFactEnrichmentWorker(st, eco, time.Duration(cfg.FactEnrichmentInterval))
		evalWorker = newMemoryEvalWorker(st, phr, cfg)

		coreAPI = &daemonAPI{
			CoreAPI:          ipc.NewStoreAPI(st),
			getTrace:         tl.trace,
			getMorningStatus: func(ctx context.Context) []ipc.MorningRoutineStatus { return tl.morningStatus(ctx, time.Now()) },
			getDayPlan:       func(ctx context.Context) ipc.DayPlan { return tl.dayPlan(ctx, time.Now()) },
		}
		if voiceW != nil && voiceW.handler != nil {
			api := coreAPI.(*daemonAPI)
			api.chatFn = voiceW.handler.handleText
		}
	} else {
		// locked mode: no real store yet, so there's no meaningful CoreAPI to
		// serve. srv.Check below is the actual guard — every CoreAPI call is
		// refused before it reaches this value. This is just a safe non-nil
		// placeholder: if the guard is ever bypassed by a bug, calls land
		// here and fail loudly with ipc.ErrNotImplemented instead of a nil
		// dereference or, worse, silently succeeding.
		coreAPI = ipc.UnimplementedCoreAPI{}
	}

	// ----- IPC boundary (core ↔ modules) -----
	srv, err := ipc.Listen(cfg.SocketPath, coreAPI)
	if err != nil {
		return fmt.Errorf("ipc listen: %w", err)
	}

	passkeySess := webauthn.NewPasskeySession(5 * time.Minute)

	// Set Server.Check — the single authorization guard, run once by
	// Server.dispatch before any CoreAPI method is called (see
	// internal/ipc/server.go). In locked mode this is the ONLY thing
	// standing between an unauthenticated caller and the store: it must
	// default-deny, with an explicit allowlist for the two methods the
	// unlock flow itself needs (MethodAssertStepUp, MethodUnlock — neither
	// of which touches CoreAPI; dispatch handles them directly via
	// srv.StepUp/srv.UnlockFn). Forgetting to allowlist a new unlock-path
	// method fails safe (denied); forgetting to guard a new CoreAPI method
	// is impossible because there is nothing left to forget — every method
	// not in the allowlist is refused by construction.
	if locked {
		srv.Check = func(ctx context.Context, m ipc.Method, _ json.RawMessage) error {
			switch m {
			case ipc.MethodAssertStepUp, ipc.MethodUnlock:
				return nil // allowed in locked mode
			default:
				return errLocked
			}
		}
	} else {
		srv.Check = (&auth.Gate{Enrollment: auth.NewFloorEnrollment(), Session: passkeySess}).Check
	}

	srv.StepUp = func(ctx context.Context) error { return passkeySess.Assert(ctx, auth.Scope{}) }

	// WrapKeyFn — wraps the env key with a passkey credential public key and
	// persists the wrapped blob. Only wired when the daemon has the key in
	// memory (env key mode). Called by mavweb after passkey enrollment.
	if envKeyBytes != nil {
		srv.WrapKeyFn = func(ctx context.Context, publicKey []byte) error {
			blob, err := webauthn.WrapKey(envKeyBytes, publicKey)
			if err != nil {
				return fmt.Errorf("wrap encryption key: %w", err)
			}
			wp := *wrappedKeyPath
			if wp == "" {
				wp = cfg.DefaultWrappedKeyPath()
			}
			if err := os.WriteFile(wp, blob, 0o600); err != nil {
				return fmt.Errorf("write wrapped key: %w", err)
			}
			log.Printf("mavend: wrapped encryption key with passkey credential (%d bytes)", len(blob))
			return nil
		}
	}

	// UnlockFn — cold-start unlock: unwraps the encryption key from the wrapped
	// blob using the passkey credential public key, opens the store, wires all
	// daemon components, and replaces the locked API.
	if locked {
		srv.UnlockFn = func(ctx context.Context, publicKey []byte) error {
			wp := *wrappedKeyPath
			blob, err := os.ReadFile(wp)
			if err != nil {
				return fmt.Errorf("read wrapped key: %w", err)
			}
			key, err := webauthn.UnwrapKey(blob, publicKey)
			if err != nil {
				return fmt.Errorf("unwrap key: %w", err)
			}
			// Open the store with the unwrapped key.
			st, err = store.OpenEncrypted(ctx, cfg.DBPath, cfg.DBTmpfs, key)
			if err != nil {
				return fmt.Errorf("unlock store: %w", err)
			}

			// Wire everything.
			rules = loop.DefaultRules()
			gatherer = loop.NewGatherer(st, rules)
			if cfg.QuietHours != nil {
				gatherer.SetQuietHours(cfg.QuietHours.Start, cfg.QuietHours.End)
			}

			phr = phraser.NewStub()
			if cfg.Phraser != nil {
				pc := phraser.Config{
					ModelPath:    cfg.Phraser.ModelPath,
					BinPath:      cfg.Phraser.BinPath,
					Listen:       cfg.Phraser.Listen,
					NGpuLayers:   cfg.Phraser.NGpuLayers,
					NCtx:         cfg.Phraser.NCtx,
					Timeout:      time.Duration(cfg.Phraser.Timeout),
					LLMNudges:    cfg.Phraser.LLMNudges,
					ContextBlock: contextBlockFn(cfg, time.Now),
				}
				if pc.BinPath == "" {
					pc.BinPath = "llama-server"
				}
				if pc.Listen == "" {
					pc.Listen = "127.0.0.1:0"
				}
				if pc.NCtx <= 0 {
					pc.NCtx = 2048
				}
				if pc.Timeout <= 0 {
					pc.Timeout = 30 * time.Second
				}
				phr, err = phraser.NewLLMPhraser(ctx, pc)
				if err != nil {
					return fmt.Errorf("phraser: %w", err)
				}
			}

			eco = wireEcosystem(cfg)

			voiceW, err = wireVoice(cfg, ipc.NewStoreAPI(st), phr, st.VectorMemory(), st, eco)
			if err != nil {
				return fmt.Errorf("wire voice: %w", err)
			}

			var ntfy delivery.Sink
			if cfg.Ntfy != nil {
				s, err := ntfysink.New(*cfg.Ntfy)
				if err != nil {
					return fmt.Errorf("wire ntfy sink: %w", err)
				}
				ntfy = s
			}
			var telegram delivery.Sink
			if cfg.Telegram != nil {
				s, err := telegramsink.New(*cfg.Telegram)
				if err != nil {
					return fmt.Errorf("wire telegram sink: %w", err)
				}
				telegram = s
			}
			var voiceSink delivery.Sink
			if voiceW != nil {
				voiceSink = voiceW.voiceSink
			}
			if _, err := st.ReconcileStaleDeliveryAttempts(context.Background(), time.Now()); err != nil {
				log.Printf("delivery outbox reconcile: %v", err)
			}
			dispatcher = delivery.NewDispatcher(delivery.Config{
				Ntfy:      ntfy,
				Telegram:  telegram,
				Voice:     voiceSink,
				Ack:       st,
				Nudges:    st,
				Reminders: st,
				Outbox:    st,
			})

			tickInterval := time.Duration(cfg.TickInterval)
			repeatInterval := time.Duration(cfg.RepeatInterval)
			autotuneInterval := time.Duration(cfg.AutotuneInterval)
			tl = newTickLoop(st, gatherer, dispatcher, phr, rules, tickInterval, repeatInterval, autotuneInterval, cfg.Digest, routinesFromConfig(cfg.Routines), config.MorningRoutinesFromConfig(cfg.MorningRoutines), cfg.PatternProposals)
			factWorker = newFactEnrichmentWorker(st, eco, time.Duration(cfg.FactEnrichmentInterval))
			evalWorker = newMemoryEvalWorker(st, phr, cfg)

			// Swap the CoreAPI from the locked placeholder to the real store adapter.
			newAPI := &daemonAPI{
				CoreAPI:          ipc.NewStoreAPI(st),
				getTrace:         tl.trace,
				getMorningStatus: func(ctx context.Context) []ipc.MorningRoutineStatus { return tl.morningStatus(ctx, time.Now()) },
				getDayPlan:       func(ctx context.Context) ipc.DayPlan { return tl.dayPlan(ctx, time.Now()) },
			}
			if voiceW != nil && voiceW.handler != nil {
				newAPI.chatFn = voiceW.handler.handleText
			}
			srv.SetAPI(newAPI)
			srv.Check = (&auth.Gate{Enrollment: auth.NewFloorEnrollment(), Session: passkeySess}).Check

			// Start voice server.
			if voiceW != nil {
				var wg sync.WaitGroup
				wg.Add(1)
				go func() {
					defer wg.Done()
					if err := voiceW.server.Serve(); err != nil && !errors.Is(err, net.ErrClosed) {
						log.Printf("voice serve: %v", err)
					}
				}()
				log.Printf("mavend: voice listening on %s", voiceW.server.Addr())
			}

			// Start tick loop.
			go func() {
				tl.run(ctx)
			}()

			// Start fact-entity enrichment worker.
			go func() {
				factWorker.run(ctx)
			}()

			// Start background memory evaluation (nil unless configured).
			if evalWorker != nil {
				go func() {
					evalWorker.run(ctx)
				}()
			}

			dl.unlock()
			log.Printf("mavend: unlocked via passkey assertion")
			return nil
		}
	}

	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		if err := srv.Serve(); err != nil && !errors.Is(err, net.ErrClosed) {
			log.Printf("ipc serve: %v", err)
		}
	}()
	log.Printf("mavend: ipc listening on %s", srv.Path())

	if !locked && voiceW != nil {
		wg.Add(1)
		go func() {
			defer wg.Done()
			if err := voiceW.server.Serve(); err != nil && !errors.Is(err, net.ErrClosed) {
				log.Printf("voice serve: %v", err)
			}
		}()
		log.Printf("mavend: voice listening on %s", voiceW.server.Addr())
	}

	if !locked {
		wg.Add(1)
		go func() {
			defer wg.Done()
			tl.run(ctx)
		}()
		wg.Add(1)
		go func() {
			defer wg.Done()
			factWorker.run(ctx)
		}()
		if evalWorker != nil {
			wg.Add(1)
			go func() {
				defer wg.Done()
				evalWorker.run(ctx)
			}()
		}
	}

	<-ctx.Done()
	log.Printf("mavend: shutdown signal received")
	if err := srv.Close(); err != nil {
		log.Printf("ipc close: %v", err)
	}
	if voiceW != nil {
		voiceW.close()
	}
	wg.Wait()
	log.Printf("mavend: bye")
	return nil
}

// personaFacts reads the optional, deployment-specific facts (his name, his
// city, the free-text persona string) out of the config. Everything here may
// be empty — the context block is correct without any of it.
func personaFacts(cfg *config.Config) persona.Facts {
	f := persona.Facts{
		// Telegram lives outside the voice block, so it counts either way.
		Telegram: cfg.Telegram != nil && cfg.Telegram.BotToken != "" && cfg.Telegram.ChatID != "",
	}
	if cfg.Voice == nil {
		return f
	}
	f.OwnerName = cfg.Voice.OwnerName
	f.City = cfg.Voice.City
	f.Static = cfg.Voice.Persona
	// Same test wireVoice uses to pick the real provider over the stub.
	f.Weather = cfg.Voice.Weather != nil && cfg.Voice.Weather.Provider == "open-meteo"
	f.Tools = len(cfg.Voice.Tools) > 0
	return f
}

// contextBlockFn returns the per-turn renderer of the shared context block.
// Per turn, not once at startup, because the block states the current time.
func contextBlockFn(cfg *config.Config, now func() time.Time) func() string {
	f := personaFacts(cfg)
	return func() string { return f.Block(now()) }
}