// Package config is maven's daemon configuration.
//
// The daemon reads a single JSON file at startup (path from the -config flag,
// default ~/.config/maven/mavend.json). Everything a module needs is wired
// from this file: the store path, the unix socket path, the tick cadence,
// and per-sink configs (ntfy/telegram). Credentials live in the file (or a
// systemd credential that the file points at) — never in the binary.
//
// This package is pure data + a loader. It imports the sink config structs
// so the daemon wires each `Sink` from a single, typed config tree without
// re-declaring their shapes (the sink constructors own validation).
package config

import (
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/kami/maven/internal/delivery/ntfysink"
	"github.com/kami/maven/internal/delivery/telegramsink"
	"github.com/kami/maven/internal/morning"
	"github.com/kami/maven/internal/update"
	"github.com/robfig/cron/v3"
)

// Config — the daemon's whole config tree. Loaded once at startup.
//
// Fields with omitempty are optional: a missing sink config = that channel
// not wired (the dispatcher's nil-sink path skips it silently, the same as a
// deliberately-unwired channel at scaffold time).
type Config struct {
	// DBPath — sqlite database path. Default applied by Load if empty.
	// When encryption is configured, the file at this path is ciphertext
	// (AES-256-GCM); the daemon works on a tmpfs plaintext copy.
	DBPath string `json:"db_path"`

	// DBKeyB64 — base64 (std encoding) of a raw 32-byte AES-256 key. Empty ⇒
	// the store is plaintext (dev/CI). Prefer DBKeyEnv over baking the key
	// into the config file. Exactly one of DBKeyB64/DBKeyEnv should be set.
	//
	// ponytail: raw key, no KDF — stdlib has no argon2/scrypt and x/crypto
	// isn't a dep. This is also the seam the L3 passkey cold-start key plugs
	// into later: the passkey op produces the 32 bytes and calls
	// store.OpenEncrypted directly, bypassing config.
	DBKeyB64 string `json:"db_key_b64,omitempty"`

	// DBKeyEnv — name of an env var holding the base64 32-byte key. Takes
	// precedence over DBKeyB64. Lets systemd credentials / secrets managers
	// inject the key without it touching the config file.
	DBKeyEnv string `json:"db_key_env,omitempty"`

	// DBTmpfs — plaintext working-copy path (RAM-backed). Empty ⇒ a stable
	// per-db path under /dev/shm. Only used when encryption is configured.
	DBTmpfs string `json:"db_tmpfs,omitempty"`

	// SocketPath — the unix socket the IPC server listens on. Modules
	// connect here; the dir is created 0700, the socket chmod'd 0600 by
	// ipc.Listen. Default applied by Load if empty.
	SocketPath string `json:"socket_path"`

	// StateDir — base dir for db + socket if their paths aren't absolute.
	// Default applied by Load if empty (XDG-style: ~/.local/share/maven for
	// the db, /run/user/$UID/maven for the socket).
	StateDir string `json:"state_dir,omitempty"`

	// TickInterval — the proactive loop cadence. Default 60s. The loop is
	// "dumb + deterministic": most ticks evaluate a few predicates and die
	// for free; raising this saves nothing worth losing responsiveness over.
	TickInterval Duration `json:"tick_interval,omitempty"`

	// RepeatInterval — how often sev4 telegram sends re-fire until acked.
	// Default 5m. A disk-fire alarm that repeats every tick (60s) is spam;
	// one that repeats never is silent. The default tilts toward "loud."
	RepeatInterval Duration `json:"repeat_interval,omitempty"`

	// AutotuneInterval — how often the feedback auto-tuner runs: reads
	// store.RecentOutcomes for each rule, calls loop.TuneCooldown, writes the
	// tuned cooldown back as a `facts (kind=config, source=feedback)` row
	// if it changed. Default 10m — slow enough to be cheap + not write every
	// tick (append-only facts churn), fast enough that a weird-afternoon
	// pattern shows up inside a day. 0 ⇒ autotune disabled (the gatherer
	// falls back to the rule's static Base, matching pre-autotune behavior).
	AutotuneInterval Duration `json:"autotune_interval,omitempty"`

	// FactEnrichmentInterval — how often the fact-entity enrichment worker
	// polls for facts with resolution_state='pending' and resolves their
	// subject against Nexus. Default 30s. Only runs when Nexus is configured;
	// no-ops (harmlessly) otherwise.
	FactEnrichmentInterval Duration `json:"fact_enrichment_interval,omitempty"`

	// Ntfy — the ntfy push sink config. nil ⇒ ntfy channel not wired.
	// sev3 (ops soft) away + sev4 (ops hard) present + reminders away all
	// route here; not wiring ntfy means those routes drop silently.
	Ntfy *ntfysink.Config `json:"ntfy,omitempty"`

	// Telegram — the telegram push sink config. nil ⇒ telegram channel
	// not wired. sev4 away routes here with repeat-til-ack; not wiring
	// telegram means sev4-away alarms silently drop (a disk-fire alarm at
	// 2am that no one sees — wire it).
	Telegram *telegramsink.Config `json:"telegram,omitempty"`

	// Phraser — the LLM-backed phraser config. nil ⇒ the daemon uses the
	// template-based Stub (deterministic, no model required — good for CI).
	// When configured, the daemon spawns llama-server as a subprocess and
	// calls its /v1/chat/completions endpoint to phrase nudges and reminders.
	Phraser *PhraserConfig `json:"phraser,omitempty"`

	// Update — how THIS box deploys a new build of Maven (Vikunja #249). nil ⇒
	// the update capability does not exist, which is the state to leave it in
	// unless the operator has read internal/update's package comment.
	//
	// mavend never acts on this block: it constructs no Updater and cannot
	// update itself. Validate below is the one thing the daemon does with it, so
	// a broken update config is caught at startup instead of on the night it is
	// needed. That validation is also why internal/update is linked into mavend
	// at all — linked, with no caller, which is the property that matters. The
	// block lives here because cmd/mavupdate — a CLI the owner runs on the host,
	// the only trigger there is — reads the same config file to find the socket
	// it health-checks.
	Update *update.Config `json:"update,omitempty"`

	// Voice — the client↔core surface + the stt/tts modules the daemon
	// wires. nil ⇒ the daemon doesn't wire voice: the TCP listener stays
	// down, the dispatcher's Voice slot stays nil (the routing table's
	// ChannelVoice selections drop silently — same as pre-voice behaviour).
	// To enable: voice.enabled = true AND voice.bind = an address inside
	// the wg tunnel; the daemon binds the TCP listener there.
	Voice *VoiceConfig `json:"voice,omitempty"`

	// QuietHours — time-window schedule for quiet hours. When set, the
	// loop's gatherer sets `quiet = true` in the State during the window,
	// suppressing care nudges (sev1-2). The user can also toggle quiet
	// hours by voice ("тихий режим") — that writes a `quiet_hours` config
	// fact independently; both the schedule AND the toggle activate quiet.
	// nil ⇒ quiet hours only activate via the voice toggle.
	QuietHours *QuietHoursConfig `json:"quiet_hours,omitempty"`

	// DisabledRules — nudge rules that are not wired at all, by name
	// ("service_down", "netdata_critical", "water", "meal", "break").
	//
	// Rules are code, not config (see loop.DefaultRules), and that stays true:
	// this only subtracts. It exists because a rule can be right in principle
	// and useless in practice. service_down was the case that forced it: it
	// could not name the service it was nudging about, so being told "a service
	// on homesrv is down" every fifteen minutes was noise with no action
	// attached. That is fixed — one fact per kuma monitor — and the rule ships
	// enabled again. The escape hatch stays.
	//
	// A disabled rule is never gathered for, never evaluated, and never
	// delivered on any channel. Unknown names are ignored, so removing a rule
	// from the code does not break a config that still lists it.
	// Empty ⇒ every rule runs, which is the default.
	DisabledRules []string `json:"disabled_rules,omitempty"`

	// Digest — notification batching / digest mode. nil ⇒ digest disabled
	// (every nudge is sent as it fires — legacy behaviour).
	Digest *DigestConfig `json:"digest,omitempty"`

	// Routines — scheduled behaviors maven performs on a cron schedule (a
	// morning briefing, an evening wind-down), independent of any request or
	// care predicate. Each fires its Body through the dispatcher on its Cron
	// schedule. Empty ⇒ no routines. See internal/routine for the class
	// distinction from reminders (user-stated) and care rules (world-state).
	Routines []RoutineConfig `json:"routines,omitempty"`

	// MorningRoutines — daily checklists (medicine, water, pets, ...) checked
	// once near the end of a time window instead of firing one reminder per
	// item. See internal/morning for the evaluation engine. Empty ⇒ disabled.
	MorningRoutines []MorningRoutineConfig `json:"morning_routines,omitempty"`

	// PatternProposals — whether a routine the digestion tick inferred on its
	// own may be announced, and how often. nil / absent ⇒ silent detection
	// only: proposals are written for /routines and never announced. See
	// PatternProposalConfig.
	PatternProposals *PatternProposalConfig `json:"pattern_proposals,omitempty"`

	// MemoryEval — background memory evaluation (internal/memeval). nil /
	// absent ⇒ no evaluation loop at all. See MemoryEvalConfig.
	MemoryEval *MemoryEvalConfig `json:"memory_eval,omitempty"`

	// Email — mail ingestion (Vikunja #246). nil / absent ⇒ core refuses
	// ipc.MethodIngestMail outright, so a mail reader cannot make Maven read a
	// mailbox by merely existing. See EmailConfig; the IMAP host and credential
	// live in the reader (cmd/mavmaild), never here.
	Email *EmailConfig `json:"email,omitempty"`

	// IntakeJournal — how many entries the unified intake journal keeps
	// (Vikunja #283): one envelope per thing that arrived, whatever direction it
	// came from. Absent ⇒ DefaultIntakeJournal. A NEGATIVE value turns the
	// journal off entirely, and then there is no decorator on the intake path at
	// all.
	//
	// Not gated behind an "off unless configured" block like feeds or telegram,
	// and the distinction is the one CLAUDE.md draws: that rule exists for
	// capabilities that reach OUT — a fetch, a send, a third party. This reaches
	// nowhere. It is a bounded in-memory log of writes core already performed,
	// it is read only by /events and the simulator, and nothing Maven says
	// depends on it.
	IntakeJournal int `json:"intake_journal,omitempty"`

	// Feeds — RSS/Atom feed reading (Vikunja #258). nil / absent ⇒ no feed is
	// ever fetched: reading the outside world is off unless configured, like
	// the weather and telegram. See FeedsConfig.
	Feeds *FeedsConfig `json:"feeds,omitempty"`

	// Crawl — reading a web page (Vikunja #259). nil / absent ⇒ Maven never
	// fetches a page: not on request, not on a schedule. See CrawlConfig.
	Crawl *CrawlConfig `json:"crawl,omitempty"`

	// Kiwix — the offline ZIM reader (Vikunja #122 neighbourhood). nil / absent
	// / url empty ⇒ the query chain has no ZIM source. See KiwixConfig.
	Kiwix *KiwixConfig `json:"kiwix,omitempty"`

	// Search — the SearXNG metasearch instance. nil / absent / url empty ⇒ the
	// query chain has no web-search source and Kiwix is the only encyclopedia.
	// See SearchConfig.
	Search *SearchConfig `json:"search,omitempty"`

	// Workstation — the big model on the owner's desktop, preferred over the
	// resident one when its GPU is free. nil / absent / url empty ⇒ homesrv
	// behaves exactly as it does today. See WorkstationConfig.
	Workstation *WorkstationConfig `json:"workstation,omitempty"`

	// Praxis — the ecosystem attention-state service. When configured, maven
	// calls the Praxis HTTP tools API for attention listing and item lifecycle.
	// Maven never touches Praxis's database directly (ecosystem invariant: no
	// component reads another's store). nil ⇒ ecosystem integration disabled.
	Praxis *PraxisConfig `json:"praxis,omitempty"`

	// Nexus — the canonical identity service. When configured, maven resolves
	// entity references (projects, services, devices, etc.) through Nexus
	// before acting on them. nil ⇒ resolution disabled (maven uses raw text).
	Nexus *NexusConfig `json:"nexus,omitempty"`

	// Hexis — the capability execution service. When configured, maven
	// discovers and executes capabilities through Hexis for ecosystem actions.
	// nil ⇒ no capability-aware routing.
	Hexis *HexisConfig `json:"hexis,omitempty"`

	// Vision — image understanding (Vikunja #252). nil / absent ⇒ she cannot
	// look at pictures at all: the intake refuses, and no vision server is
	// contacted. See VisionConfig.
	Vision *VisionConfig `json:"vision,omitempty"`

	// Media — where images and captured audio are kept on disk, and for how
	// long. nil / absent ⇒ no blob store is wired, which is what disables both
	// vision intake and meeting capture regardless of their own blocks: nothing
	// in this repo holds a recording only in memory. See MediaConfig.
	Media *MediaConfig `json:"media,omitempty"`

	// Capture — meeting recording and summarisation (Vikunja #253). nil /
	// absent ⇒ the recorder does not exist: the start/stop methods are not
	// served at all, so nothing on this box can begin a recording. This is the
	// most invasive capability Maven has and it is the one most firmly off by
	// default. See CaptureConfig.
	Capture *CaptureConfig `json:"capture,omitempty"`

	// Speaker — voice identification (Vikunja #255). nil / absent ⇒ no
	// voiceprint is ever computed and nobody can be enrolled. Enabling it needs
	// a speaker-embedding model, which is not on this box. See SpeakerConfig.
	Speaker *SpeakerConfig `json:"speaker,omitempty"`

	// MCP — Model Context Protocol servers Maven connects OUT to (Vikunja
	// #251). nil / absent / no enabled server ⇒ no connection is made and no
	// tool is discovered, like every other capability that reaches outside the
	// box. She is a client here, never a server: nothing exposes her own
	// capabilities to an outside caller. See MCPConfig.
	MCP *MCPConfig `json:"mcp,omitempty"`

	// SmartHome — the Home Assistant instance (Vikunja #256). nil / absent /
	// disabled ⇒ Maven neither reads the house nor touches it, and no house row
	// exists in the act allowlist. See SmartHomeConfig.
	SmartHome *SmartHomeConfig `json:"smarthome,omitempty"`

	// NetScan — the LAN scanner (Vikunja #257). nil / absent / disabled ⇒
	// Maven never puts a packet on the network looking for hosts. See
	// NetScanConfig.
	NetScan *NetScanConfig `json:"netscan,omitempty"`
}

// RoutineConfig — one scheduled routine. Cron is a standard 5-field expression
// ("0 8 * * *" = 08:00 daily). Body is the RU text delivered verbatim (routines
// are not LLM-phrased). Severity (1-4, default 1) drives routing: care-class
// (≤2) is suppressed by quiet hours and drops when away; ops-class reaches away
// channels.
type RoutineConfig struct {
	Name     string `json:"name"`
	Cron     string `json:"cron"`
	Body     string `json:"body"`
	Severity int    `json:"severity,omitempty"`
}

// MorningRoutineConfig — one daily checklist. WindowStart/WindowEnd/NudgeAt
// are "HH:MM" local time; NudgeAt empty defaults to WindowEnd. Weekdays are
// 0=Sunday..6=Saturday; empty means every day (set two routines under
// different names for weekday/weekend variants).
type MorningRoutineConfig struct {
	Name        string                     `json:"name"`
	Weekdays    []int                      `json:"weekdays,omitempty"`
	WindowStart string                     `json:"window_start"`
	WindowEnd   string                     `json:"window_end"`
	NudgeAt     string                     `json:"nudge_at,omitempty"`
	Severity    int                        `json:"severity,omitempty"`
	Items       []MorningRoutineItemConfig `json:"items"`
}

// MorningRoutineItemConfig — one checklist entry. FactKey is the fact whose
// presence within the window counts as completion evidence.
type MorningRoutineItemConfig struct {
	Key     string `json:"key"`
	FactKey string `json:"fact_key"`
	Label   string `json:"label"`
	// Optional — this one being skipped does not earn a nudge. Default false,
	// so a routine written before 04-08-2026 keeps behaving as it did.
	Optional bool `json:"optional,omitempty"`
}

// QuietHoursConfig — a recurring daily quiet-window. Times are local to the
// server's wall clock. A window crossing midnight (Start > End) is handled:
// "23:00"-"08:00" means quiet from 23:00 to 08:00 the next day.
type QuietHoursConfig struct {
	Start string `json:"start,omitempty"` // "HH:MM" local time, e.g. "23:00"
	End   string `json:"end,omitempty"`   // "HH:MM" local time, e.g. "08:00"
}

// WeatherConfig configures the weather provider for voice queries.
type WeatherConfig struct {
	Provider        string `json:"provider,omitempty"`         // "open-meteo" or "" → stub
	DefaultLocation string `json:"default_location,omitempty"` // e.g. "Moscow"
}

// ToolConfig — one enabled tool. Name is the spoken verb ("restart"); Cmd is
// the fixed argv prefix (["systemctl","restart"]); Destructive marks acts that
// must not fire from the voice path (they need a confirm on an authed surface).
type ToolConfig struct {
	Name        string   `json:"name"`
	Scope       string   `json:"scope,omitempty"`
	Cmd         []string `json:"cmd"`
	Destructive bool     `json:"destructive,omitempty"`
}

// DigestConfig — notification batching / digest mode. When enabled, eligible
// nudges (severity ≤ SeverityCeiling) are queued in memory instead of sent
// immediately. Every Window duration (or when MaxItems reached), the queue is
// flushed as a single digest notification. nil ⇒ digest disabled (legacy
// behaviour — every nudge is sent as it fires).
type DigestConfig struct {
	Enabled         bool     `json:"enabled,omitempty"`
	Window          Duration `json:"window,omitempty"`           // e.g. "30m"
	MaxItems        int      `json:"max_items,omitempty"`        // flush at this count
	SeverityCeiling int      `json:"severity_ceiling,omitempty"` // max sev batched
}

// PatternProposalConfig — announcement policy for routines the digestion tick
// inferred by itself (Vikunja #247, #43).
//
// Detection is always on and always silent by default: the tick writes a
// proposed_routines row and the /routines page shows it. Notify is what turns
// "she noticed" into "she said something", and it is OFF unless configured —
// Maven is not a nag and not autonomous, so a behaviour that speaks without
// being asked has to be switched on deliberately, like weather and telegram.
//
// When Notify is on, the announcement is still heavily restrained:
//   - at most one proposal per tick, however many were detected;
//   - at most one per Cooldown across all pairs (not per pair), so a batch of
//     freshly-detected patterns cannot turn into a queue of interruptions;
//   - through the ordinary care-class gate (quiet hours / away / snooze), at
//     sev1 — the lowest severity there is. A proposal is the least urgent
//     thing Maven can say.
//
// A pair is only ever announced once, because it is only ever proposed once:
// proposed_routines is UNIQUE(action, object) and the row survives dismissal.
type PatternProposalConfig struct {
	// Notify — announce newly inferred routines. Default false.
	Notify bool `json:"notify,omitempty"`

	// Cooldown — minimum spacing between two proposal announcements. 0 ⇒
	// DefaultProposalCooldown (24h).
	Cooldown Duration `json:"cooldown,omitempty"`
}

// AnnounceProposals reports whether inferred routines may be announced. Safe
// on a nil receiver — an absent config block means silent detection.
func (p *PatternProposalConfig) AnnounceProposals() bool {
	return p != nil && p.Notify
}

// MemoryEvalConfig — the background memory-evaluation loop (Vikunja #248).
// Absent ⇒ off, like every other capability that costs something the owner did
// not ask for. Each evaluation is a full LLM round-trip on the one resident
// model, which is the same model answering him; running it hourly by default
// would put a multi-second stall in front of an occasional voice turn for a
// feature he may not want.
//
// The loop only ever writes notes (source infer:memory-eval, visible on
// /dash). It cannot speak — see internal/memeval.
type MemoryEvalConfig struct {
	// Interval — how often to evaluate. 0 ⇒ DefaultMemoryEvalInterval.
	Interval Duration `json:"interval,omitempty"`

	// MaxItems — recent facts / notes / nudges fed into one evaluation.
	// 0 ⇒ memeval.DefaultMaxItems.
	MaxItems int `json:"max_items,omitempty"`

	// MinConfidence — observations the model scores below this are dropped.
	// 0 ⇒ memeval.DefaultMinConfidence.
	MinConfidence float64 `json:"min_confidence,omitempty"`
}

// EmailConfig — core's half of the email reader: how many task candidates one
// message may produce, and how long the extraction call may take.
//
// There is deliberately nothing about a mailbox here. Core does not connect to
// IMAP, does not know an account exists, and holds no mail credential — the
// reader daemon does, the same split mavpoll uses for the zenmoney token. This
// block only says "extraction is allowed, with these bounds".
type EmailConfig struct {
	// MaxTasks — candidates per message. 0 ⇒ email.MaxCandidates (3).
	MaxTasks int `json:"max_tasks,omitempty"`

	// Timeout — per-message extraction budget. 0 ⇒ DefaultEmailTimeout. This is
	// a Thinking model reading a mail; nobody is waiting on the answer, but a
	// hung llama-server must not pin the reader's connection forever.
	Timeout Duration `json:"timeout,omitempty"`
}

// DefaultEmailTimeout — extraction budget per message.
const DefaultEmailTimeout = 2 * time.Minute

// PhraserConfig — the LLM-backed phraser seam. The daemon spawns llama-server
// as a managed subprocess and sends chat-completion requests to phrase nudge
// and reminder messages. nil ⇒ the template-based Stub is used instead.
//
// ModelPath is the only required field. The rest have sensible defaults:
//   - BinPath defaults to "llama-server" (found via PATH at spawn time).
//   - Listen defaults to "127.0.0.1:0" (random port, read from stderr).
//   - NGpuLayers defaults to -1 (max, uses all available GPU layers).
//   - NCtx defaults to 2048.
//   - Timeout defaults to 30s per request.
type PhraserConfig struct {
	ModelPath  string   `json:"model_path"`
	BinPath    string   `json:"bin_path,omitempty"`
	Listen     string   `json:"listen,omitempty"`
	NGpuLayers int      `json:"n_gpu_layers,omitempty"`
	NCtx       int      `json:"n_ctx,omitempty"`
	Timeout    Duration `json:"timeout,omitempty"`

	// CacheRAMMiB bounds llama-server's prompt cache. Omitted ⇒ 512 MiB, which
	// is what keeps the resident model near 1 GB of RSS instead of the 7.9 GB
	// measured on 2026-08-03. Set it to -1 to pass no flag at all and let the
	// server apply its own 8 GiB default. See phraser.Config.CacheRAMMiB.
	CacheRAMMiB int `json:"cache_ram_mib,omitempty"`

	// LLMNudges — let the model word nudges again. Off by default: nudges are
	// worded from hand-written Russian templates now (the model broke the
	// persona and invented units). Chat, query and reminder phrasing always go
	// through the model regardless. See phraser.Config.LLMNudges.
	LLMNudges bool `json:"llm_nudges,omitempty"`

	// SwapModels — the gguf files the running daemon is allowed to swap to
	// without a restart (Vikunja #250). Empty (the default) means the swap
	// capability does not exist: ipc.MethodSwapModel answers ErrUnknownMethod,
	// exactly like an unconfigured weather or telegram block.
	//
	// It is an allowlist and not a directory on purpose. The request carries a
	// path, and llama-server is started with it as `-m`; anything short of an
	// exact match against a list a human wrote in this file would make "swap the
	// model" mean "load a file of your choosing off my disk". ModelPath is
	// always swappable back to whether or not it is listed.
	//
	// Paths must be absolute — the daemon's working directory is not the
	// operator's, and a relative path here would resolve somewhere surprising.
	SwapModels []string `json:"swap_models,omitempty"`
}

// EmbedderConfig — paths for the ONNX multilingual embedder. The daemon
// constructs an in-process ONNX embedder when all three paths are non-empty;
// the router's classifier then uses real sentence embeddings instead of the
// floor HashEmbedder stub. Model_path is the ONNX model file, tokenizer_path
// is tokenizer.json (Unigram), lib_path is the ONNX Runtime shared library.
type EmbedderConfig struct {
	ModelPath     string `json:"model_path,omitempty"`
	TokenizerPath string `json:"tokenizer_path,omitempty"`
	LibPath       string `json:"lib_path,omitempty"`
}

// WorkerConfig — a unix-socket worker module connection. Used by Stt and
// (via TtsConfig embedding the same fields) by Tts. Socket is the unix
// socket path the worker module listens on (e.g.
// /run/user/$UID/maven/stt.sock). Lang overrides the surface default for
// this module when the user wants different langs for stt vs tts (rare).
type WorkerConfig struct {
	Socket string `json:"socket,omitempty"`
	Lang   string `json:"lang,omitempty"`
}

// TtsConfig — the tts worker module connection + tts-specific Voice field
// (a named voice when the worker supports multiple; "" ⇒ the worker's
// configured default).
type TtsConfig struct {
	Socket string `json:"socket,omitempty"`
	Lang   string `json:"lang,omitempty"`
	Voice  string `json:"voice,omitempty"`
}

// Duration — a time.Duration that round-trips through JSON as a string
// ("60s", "5m", "1h30m"). Plain time.Duration marshals as a nanosecond int,
// which is unreadable in a config file; this wrapper uses ParseDuration.
type Duration time.Duration

func (d Duration) MarshalJSON() ([]byte, error) {
	return json.Marshal(time.Duration(d).String())
}

func (d *Duration) UnmarshalJSON(b []byte) error {
	var s string
	if err := json.Unmarshal(b, &s); err != nil {
		return err
	}
	v, err := time.ParseDuration(s)
	if err != nil {
		return fmt.Errorf("config: bad duration %q: %w", s, err)
	}
	*d = Duration(v)
	return nil
}

// Defaults applied when the corresponding field is empty/zero.
const (
	DefaultTickInterval     = 60 * time.Second
	DefaultRepeatInterval   = 5 * time.Minute
	DefaultAutotuneInterval = 10 * time.Minute
	DefaultRouterThreshold  = 0.55
	// DefaultIntakeJournal — entries kept in the unified intake journal
	// (Vikunja #283). A busy day is a few hundred intake writes, so this is
	// roughly "today and yesterday" at a few hundred KB of memory.
	DefaultIntakeJournal = 512
	DefaultQueryMinScore = 0.55
	// Read off the margin sweep in internal/memory/recalleval on the e5
	// embedder: 0.008 answers 68% of real questions (down from 72%) and cuts
	// false recall from 5/5 to 1/5. Every larger delta costs real recall
	// without removing that last one until 0.020, which drops recall to 44%.
	DefaultQueryMinMargin = 0.008
	// DefaultClarifyMaxAttempts — see dialogue.DefaultMaxAttempts.
	DefaultClarifyMaxAttempts = 3
	DefaultToolTimeout        = 30 * time.Second
	// DefaultLLMRouter — route with the resident model unless told otherwise.
	DefaultLLMRouter = true

	DefaultFactEnrichmentInterval = 30 * time.Second

	// DefaultProposalCooldown — one inferred-routine announcement per day at
	// most. A proposal is never urgent; if two patterns surface in the same
	// hour, the second one waits, and the /routines page has it either way.
	DefaultProposalCooldown = 24 * time.Hour

	// DefaultMemoryEvalInterval — the plan's cadence (1h) for the memory
	// evaluation loop, applied only when the block is present at all.
	DefaultMemoryEvalInterval = time.Hour
)

// Load reads the JSON config at path and applies defaults. A missing file is
// an error — the daemon refuses to start without an explicit config (the
// default-less state is too permissive: empty db path, no sinks, an idle
// loop that silently does nothing, etc. — better to surface the gap than to
// run an idle daemon the user thinks is wired).
func Load(path string) (*Config, error) {
	b, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("config: read %s: %w", path, err)
	}
	// Expand ${VAR} or $VAR patterns from environment variables. This lets
	// secrets live in env (docker-compose env_file) rather than the config
	// file committed to git.
	expanded := os.ExpandEnv(string(b))
	var c Config
	if err := json.Unmarshal([]byte(expanded), &c); err != nil {
		return nil, fmt.Errorf("config: parse %s: %w", path, err)
	}
	c.applyDefaults()
	if err := c.validate(); err != nil {
		return nil, fmt.Errorf("config: %s: %w", path, err)
	}
	return &c, nil
}

func (c *Config) applyDefaults() {
	if c.IntakeJournal == 0 {
		c.IntakeJournal = DefaultIntakeJournal
	}
	if c.TickInterval == 0 {
		c.TickInterval = Duration(DefaultTickInterval)
	}
	if c.RepeatInterval == 0 {
		c.RepeatInterval = Duration(DefaultRepeatInterval)
	}
	if c.AutotuneInterval == 0 {
		c.AutotuneInterval = Duration(DefaultAutotuneInterval)
	}
	if c.FactEnrichmentInterval == 0 {
		c.FactEnrichmentInterval = Duration(DefaultFactEnrichmentInterval)
	}
	// StateDir — when set, use it as the base for both db and socket if their
	// paths are still relative (empty). If StateDir is empty, fall back to the
	// XDG-style defaults (data dir for db, runtime dir for socket).
	if c.StateDir != "" {
		if c.DBPath == "" {
			c.DBPath = filepath.Join(c.StateDir, "maven.db")
		}
		if c.SocketPath == "" {
			c.SocketPath = filepath.Join(c.StateDir, "mavend.sock")
		}
	} else {
		if c.DBPath == "" {
			c.DBPath = filepath.Join(defaultDataDir(), "maven.db")
		}
		if c.SocketPath == "" {
			c.SocketPath = filepath.Join(defaultRuntimeDir(), "mavend.sock")
		}
	}

	if c.Digest == nil {
		c.Digest = &DigestConfig{Enabled: false}
	}
	if c.Digest.Window == 0 {
		c.Digest.Window = Duration(30 * time.Minute)
	}
	if c.Digest.MaxItems == 0 {
		c.Digest.MaxItems = 5
	}
	if c.Digest.SeverityCeiling == 0 {
		c.Digest.SeverityCeiling = 2
	}

	// Absent block stays nil (⇒ silent detection). Present-but-partial gets the
	// cooldown default, so `{"notify": true}` is enough to switch it on.
	if c.PatternProposals != nil && c.PatternProposals.Cooldown <= 0 {
		c.PatternProposals.Cooldown = Duration(DefaultProposalCooldown)
	}

	// Same rule: absent stays nil (⇒ no evaluation loop), present gets defaults
	// so `{}` is a valid "on with the plan's cadence".
	if c.MemoryEval != nil && c.MemoryEval.Interval <= 0 {
		c.MemoryEval.Interval = Duration(DefaultMemoryEvalInterval)
	}

	// Same rule again: absent stays nil (⇒ mail ingestion refused), present gets
	// the timeout default so `{}` is a valid "on with the defaults".
	if c.Email != nil && c.Email.Timeout <= 0 {
		c.Email.Timeout = Duration(DefaultEmailTimeout)
	}

	c.normaliseFeeds()

	c.normaliseMCP()

	c.normaliseSmartHome()

	c.normaliseNetScan()

	c.normaliseCrawl()

	c.normaliseKiwix()
	c.normaliseSearch()

	c.normaliseWorkstation()

	if c.Voice != nil {
		if c.Voice.RouterThreshold <= 0 {
			c.Voice.RouterThreshold = DefaultRouterThreshold
		}
		if c.Voice.QueryMinScore <= 0 {
			c.Voice.QueryMinScore = DefaultQueryMinScore
		}
		// Unset ⇒ default. Negative is how you turn the margin off on purpose,
		// so it is clamped to 0 rather than replaced by the default.
		switch {
		case c.Voice.QueryMinMargin == 0:
			c.Voice.QueryMinMargin = DefaultQueryMinMargin
		case c.Voice.QueryMinMargin < 0:
			c.Voice.QueryMinMargin = 0
		}
		if c.Voice.ClarifyMaxAttempts <= 0 {
			c.Voice.ClarifyMaxAttempts = DefaultClarifyMaxAttempts
		}
		if c.Voice.ToolTimeout <= 0 {
			c.Voice.ToolTimeout = Duration(DefaultToolTimeout)
		}
		if c.Voice.LLMRouter == nil {
			on := DefaultLLMRouter
			c.Voice.LLMRouter = &on
		}
	}

	// routines: default severity to care-class (1) — the safe floor: a
	// misconfigured routine can't blast an away channel at 3am.
	for i := range c.Routines {
		if c.Routines[i].Severity == 0 {
			c.Routines[i].Severity = 1
		}
	}

	// morning routines: same safe-floor default as cron routines.
	for i := range c.MorningRoutines {
		if c.MorningRoutines[i].Severity == 0 {
			c.MorningRoutines[i].Severity = 1
		}
	}
}

// UseLLMRouter reports whether to route with the resident model. Unset means
// on; only an explicit false in the config turns it off.
func (v *VoiceConfig) UseLLMRouter() bool {
	if v == nil || v.LLMRouter == nil {
		return DefaultLLMRouter
	}
	return *v.LLMRouter
}

func (c *Config) validate() error {
	if c.Phraser != nil {
		if c.Phraser.ModelPath == "" {
			return errors.New("phraser.model_path is required")
		}
		// A relative entry in the swap allowlist would resolve against the
		// daemon's working directory, so the path a human reads in this file
		// would not be the path llama-server is handed. Fail at startup.
		for _, m := range c.Phraser.SwapModels {
			if !filepath.IsAbs(m) {
				return fmt.Errorf("phraser.swap_models: %q must be an absolute path", m)
			}
		}
	}
	// The update block is validated here even though mavend never acts on it: a
	// half-written update config that is only noticed by cmd/mavupdate is noticed
	// at the worst possible moment, halfway through deploying a new build.
	if c.Update != nil {
		if err := c.Update.Validate(); err != nil {
			return err
		}
	}
	if c.Voice != nil && c.Voice.Enabled {
		if c.Voice.Bind == "" {
			return errors.New("voice.enabled set but voice.bind is empty — refusing to start a voice surface with no bind address")
		}
		if c.Voice.Embedder != nil {
			partial := c.Voice.Embedder.ModelPath == "" || c.Voice.Embedder.TokenizerPath == "" || c.Voice.Embedder.LibPath == ""
			if partial {
				return errors.New("voice.embedder: all three of model_path, tokenizer_path, lib_path must be set, or remove embedder to use the floor stub")
			}
		}
	}
	// routines: name + body required, cron must parse. A typo here should fail
	// at startup, not silently never fire.
	for _, r := range c.Routines {
		if r.Name == "" {
			return errors.New("routine: name is required")
		}
		if r.Body == "" {
			return fmt.Errorf("routine %q: body is required", r.Name)
		}
		if _, err := cron.ParseStandard(r.Cron); err != nil {
			return fmt.Errorf("routine %q: bad cron %q: %w", r.Name, r.Cron, err)
		}
	}
	if err := c.validateMCP(); err != nil {
		return err
	}
	if err := c.validateSmartHome(); err != nil {
		return err
	}
	if err := c.validateNetScan(); err != nil {
		return err
	}
	if err := c.validateMedia(); err != nil {
		return err
	}
	if err := c.validateVision(); err != nil {
		return err
	}
	if err := c.validateCapture(); err != nil {
		return err
	}
	if len(c.MorningRoutines) > 0 {
		if err := morning.Validate(morningRoutinesFromConfig(c.MorningRoutines)); err != nil {
			return err
		}
	}
	return nil
}

// morningRoutinesFromConfig maps the config's morning-routine blocks to the
// engine type. Shared with the daemon so config validation and daemon wiring
// can never drift on the mapping.
func morningRoutinesFromConfig(mc []MorningRoutineConfig) []morning.Routine {
	out := make([]morning.Routine, len(mc))
	for i, r := range mc {
		items := make([]morning.Item, len(r.Items))
		for j, it := range r.Items {
			items[j] = morning.Item{Key: it.Key, FactKey: it.FactKey, Label: it.Label, Optional: it.Optional}
		}
		weekdays := make([]time.Weekday, len(r.Weekdays))
		for j, w := range r.Weekdays {
			weekdays[j] = time.Weekday(w)
		}
		out[i] = morning.Routine{
			Name:        r.Name,
			Weekdays:    weekdays,
			WindowStart: r.WindowStart,
			WindowEnd:   r.WindowEnd,
			NudgeAt:     r.NudgeAt,
			Severity:    r.Severity,
			Items:       items,
		}
	}
	return out
}

// MorningRoutinesFromConfig is the exported form daemon wiring uses.
func MorningRoutinesFromConfig(mc []MorningRoutineConfig) []morning.Routine {
	return morningRoutinesFromConfig(mc)
}

// DBEncryptionKey resolves the at-rest encryption key: DBKeyEnv (if set) wins
// over DBKeyB64. Returns (nil, nil) when neither is set — the caller then opens
// a plaintext store. A configured-but-invalid key is an error (fail closed,
// never silently downgrade to plaintext).
func (c *Config) DBEncryptionKey() ([]byte, error) {
	raw := c.DBKeyB64
	if c.DBKeyEnv != "" {
		raw = os.Getenv(c.DBKeyEnv)
		if raw == "" {
			return nil, fmt.Errorf("config: db_key_env %q is set but the env var is empty", c.DBKeyEnv)
		}
	}
	if raw == "" {
		return nil, nil
	}
	key, err := base64.StdEncoding.DecodeString(raw)
	if err != nil {
		return nil, fmt.Errorf("config: db key is not valid base64: %w", err)
	}
	if len(key) != 32 {
		return nil, fmt.Errorf("config: db key must decode to 32 bytes, got %d", len(key))
	}
	return key, nil
}

// DefaultWrappedKeyPath returns the conventional path for the wrapped
// encryption key blob — alongside the StateDir. This is the path checked
// automatically when --wrapped-key-file is not provided on the command line.
// The caller may always override via the flag.
func (c *Config) DefaultWrappedKeyPath() string {
	return filepath.Join(c.StateDir, "db_key.wrapped")
}

func defaultDataDir() string {
	if x := os.Getenv("XDG_DATA_HOME"); x != "" {
		return filepath.Join(x, "maven")
	}
	home, err := os.UserHomeDir()
	if err != nil || home == "" {
		return filepath.Join(os.TempDir(), "maven")
	}
	return filepath.Join(home, ".local", "share", "maven")
}

func defaultRuntimeDir() string {
	if x := os.Getenv("XDG_RUNTIME_DIR"); x != "" {
		return filepath.Join(x, "maven")
	}
	// /run/user/$UID is the typical answer; without XDG_RUNTIME_DIR, fall back
	// to the data dir (still works; just not tmpfs-clearance-on-reboot clean).
	return filepath.Join(defaultDataDir())
}