package server

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
	"path/filepath"
	"sort"
	"strconv"
	"strings"
	"sync"
	"time"

	actool "github.com/Autumn-27/norma/tool"
	"github.com/Autumn-27/artex/agent"
	pgdb "github.com/Autumn-27/artex/db"
	"github.com/Autumn-27/artex/enrich"
	"github.com/Autumn-27/artex/guard"
	"github.com/Autumn-27/artex/intercept"
	"github.com/Autumn-27/artex/traffic"
)

// Task is one engagement: a description + goal + its own exploration store,
// sharing the process-wide asset store. ID is the PG task id as a string; ExpID
// is the exploration the task owns.
type Task struct {
	ID           string `json:"id"`
	ExpID        int64  `json:"exploration_id"`
	Description  string `json:"description"`
	Goal         string `json:"goal"`
	CreatedAt    int64  `json:"created_at"`
	CompletedAt  int64  `json:"completed_at,omitempty"` // 进入终态的 unix 秒;0=未完成
	Paused       bool   `json:"paused"`
	ParentRef    string `json:"parent_ref,omitempty"`     // 父任务 id(编排 spawn 记录)
	LLMProfileID *int64 `json:"llm_profile_id,omitempty"` // 指定运行本任务 planner/worker 的 LLM 配置;nil=用全局激活配置
	Status       string `json:"status"`                   // persisted lifecycle status (done/failed/timeout 为终态；空/其它则由运行态推导)
	// 任务级超时(见 docs/任务级超时与收尾设计.md)。DeadlineAt/FirstRunAt 为 unix 秒,0=未设/未运行。
	TimeoutSeconds       int   `json:"timeout_seconds"`
	PlanHeartbeatSeconds int   `json:"plan_heartbeat_seconds"` // planner 心跳触发间隔(秒)
	FirstRunAt           int64 `json:"first_run_at,omitempty"`
	DeadlineAt           int64 `json:"deadline_at,omitempty"`
	Store          *pgdb.ExplorationStore `json:"-"`
	Guard          *guard.Guard           `json:"-"`
	notify         chan struct{}

	// pendingTriggers accumulates the concrete changes (worker done / finding) that
	// fired planning rounds since the last one consumed them. The debounce coalesces
	// a burst into one round, so several may pile up before drainTriggers() clears them.
	trigMu          sync.Mutex
	pendingTriggers []agent.TriggerEvent
}

// Manager owns the PostgreSQL data source (asset graph + every task's exploration
// graph + config) and the in-memory set of task handles.
type Manager struct {
	dir         string
	pg          *pgdb.DB
	assets      *pgdb.AssetStore
	traffic     *traffic.Traffic    // process-wide recording proxy (may be nil)
	enrich      *enrich.Engine      // engine-side asset auto-completion (DNS/HTTP)
	interceptor *intercept.Interceptor // user-configured tool-call interception rules

	mu        sync.RWMutex
	tasks     map[string]*Task
	active    string
	trafficOn bool // 流量捕获开关（默认关；settings.traffic_capture）
	llmRecOn  bool // LLM 录制开关（默认关；settings.llm_record）
	// 联网搜索开关与来源（默认关；settings.web_search_*）。brave-free 需要 braveKey；tavily 需要 tavilyKey。
	// webSearchProxy 是独立出口代理(http/https/socks5)，与记录流量的 MITM 代理无关。
	webSearchOn      bool
	webSearchBackend string
	braveKey         string
	tavilyKey        string
	webSearchProxy   string
}

// Settings keys the UI toggles at runtime.
const (
	settingTrafficCapture   = "traffic_capture"
	settingWebSearchOn      = "web_search_enabled"
	settingWebSearchBackend = "web_search_backend"
	settingBraveKey         = "brave_search_api_key"
	settingTavilyKey        = "tavily_search_api_key"
	settingWebSearchProxy   = "web_search_proxy"
	settingWorkers          = "workers"
	settingLLMRecord        = "llm_record"
	// defaultWebSearchBackend is used when web search is on but no backend was picked.
	defaultWebSearchBackend = "ddgs"
	// defaultWorkers is the concurrent work-agent count when the setting is unset.
	defaultWorkers = 3
)

// Workers returns the configured concurrent work-agent count (default 3). Read
// per-task at engine.Run, so a change applies to tasks started afterwards.
func (m *Manager) Workers() int {
	v, ok, err := m.pg.GetSetting(settingWorkers)
	if err != nil || !ok {
		return defaultWorkers
	}
	n, err := strconv.Atoi(strings.TrimSpace(v))
	if err != nil || n <= 0 {
		return defaultWorkers
	}
	return n
}

// SetWorkers persists the concurrent work-agent count. Values <=0 are rejected.
func (m *Manager) SetWorkers(n int) error {
	if n <= 0 {
		return fmt.Errorf("workers 必须 >0")
	}
	return m.pg.SetSetting(settingWorkers, strconv.Itoa(n))
}

// Enrich returns the asset auto-completion engine (may be nil if init failed).
func (m *Manager) Enrich() *enrich.Engine { return m.enrich }

// NewManager connects to PostgreSQL and, if proxyAddr is non-empty, starts the
// traffic-recording proxy. PostgreSQL is required (it is the single data source).
func NewManager(dir, proxyAddr string) (*Manager, error) {
	// Resolve the data dir to an ABSOLUTE path up front. Every data path derives
	// from it — notably the MITM CA cert, whose path is injected into worker shells
	// (SSL_CERT_FILE/CURL_CA_BUNDLE) and read by WebFetch. A relative path (the
	// default is "./data" under `go run`) only resolves when the current working
	// directory happens to match, so curl/WebFetch in a different CWD fail to load
	// the CA → TLS to the proxy breaks (curl 000 / EOF). Absolute makes it CWD-proof.
	if abs, err := filepath.Abs(dir); err == nil {
		dir = abs
	}
	if err := os.MkdirAll(dir, 0o755); err != nil {
		return nil, err
	}
	dsn, source, err := pgdb.DSN()
	if err != nil {
		return nil, err
	}
	log.Printf("[pg] 数据库配置来源: %s", source)
	pg, err := pgdb.Open(dsn)
	if err != nil {
		return nil, err
	}
	if err := pg.EnsureLLMRecordsTable(); err != nil {
		log.Printf("[llmrec] create table: %v", err)
	}
	m := &Manager{dir: dir, pg: pg, assets: pg.Assets(), tasks: map[string]*Task{}, interceptor: intercept.New(pg)}
	if proxyAddr != "" {
		tr, err := traffic.Open(filepath.Join(dir, "traffic"), proxyAddr)
		if err != nil {
			log.Printf("[traffic] disabled: %v", err)
		} else {
			m.traffic = tr
			go func() {
				log.Printf("[traffic] recording proxy on %s (set HTTP_PROXY=%s + trust _ca CA)", proxyAddr, tr.ProxyAddr())
				if err := tr.Start(); err != nil {
					log.Printf("[traffic] proxy stopped: %v", err)
				}
			}()
		}
	}
	// Asset auto-completion engine (§5): HTTP probes routed through the recording
	// proxy (via m.ProxyAddr, which honors the traffic-capture toggle).
	m.trafficOn = pg.GetBool(settingTrafficCapture, false)
	// LLM 录制开关（默认关）。录制器每次调用时读取此标志。
	m.llmRecOn = pg.GetBool(settingLLMRecord, false)
	// Load persisted web-search config (default: off, ddgs).
	m.webSearchOn = pg.GetBool(settingWebSearchOn, false)
	if v, ok, _ := pg.GetSetting(settingWebSearchBackend); ok && v != "" {
		m.webSearchBackend = v
	} else {
		m.webSearchBackend = defaultWebSearchBackend
	}
	if v, ok, _ := pg.GetSetting(settingBraveKey); ok {
		m.braveKey = v
	}
	if v, ok, _ := pg.GetSetting(settingTavilyKey); ok {
		m.tavilyKey = v
	}
	if v, ok, _ := pg.GetSetting(settingWebSearchProxy); ok {
		m.webSearchProxy = v
	}
	m.enrich = enrich.New(m.assets, m.ProxyAddr, 4)
	// Reconcile the seeded browser MCP with the persisted capture state, so a
	// restart with capture already on keeps Playwright routed through the proxy.
	m.syncBrowserMCPProxy()
	return m, nil
}

// TrafficEnabled reports whether traffic capture is on (default off). When off,
// no proxy/traffic tools/prompt are injected into agents (nothing is recorded).
func (m *Manager) TrafficEnabled() bool {
	m.mu.RLock()
	defer m.mu.RUnlock()
	return m.trafficOn
}

// SetTrafficEnabled persists and applies the traffic-capture toggle. Callers must
// rebuild the agents (applyLLM) afterwards so the new proxy/tools/prompt take hold.
func (m *Manager) SetTrafficEnabled(on bool) error {
	if err := m.pg.SetBool(settingTrafficCapture, on); err != nil {
		return err
	}
	m.mu.Lock()
	m.trafficOn = on
	m.mu.Unlock()
	// Inject (on) or strip (off) the recording proxy + CA on the browser MCP so
	// Playwright routes through the MITM. Must run after the flag flip above, since
	// ProxyAddr/ProxyCACert honor it. putSettings rebuilds agents next (applyLLM),
	// which re-spawns the MCP with the new args/env.
	m.syncBrowserMCPProxy()
	return nil
}

// LLMRecordEnabled reports whether LLM request/response recording is on
// (默认关；settings.llm_record). The recorder consults this per call, so the
// toggle takes effect immediately without rebuilding agents.
func (m *Manager) LLMRecordEnabled() bool {
	m.mu.RLock()
	defer m.mu.RUnlock()
	return m.llmRecOn
}

// SetLLMRecordEnabled persists and applies the LLM-record toggle. Effective at
// once — no applyLLM needed, since the recorder reads the flag on every call.
func (m *Manager) SetLLMRecordEnabled(on bool) error {
	if err := m.pg.SetBool(settingLLMRecord, on); err != nil {
		return err
	}
	m.mu.Lock()
	m.llmRecOn = on
	m.mu.Unlock()
	return nil
}

// WebSearch returns the current web-search config: whether it is enabled, the
// backend ("ddgs" | "brave-free" | "tavily"), the Brave API key, the Tavily API
// key (each empty unless set), and the dedicated egress proxy (empty = direct).
func (m *Manager) WebSearch() (on bool, backend, braveKey, tavilyKey, proxy string) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	backend = m.webSearchBackend
	if backend == "" {
		backend = defaultWebSearchBackend
	}
	return m.webSearchOn, backend, m.braveKey, m.tavilyKey, m.webSearchProxy
}

// WebSearchOpts returns the config as the agent-package struct the server pushes
// into each agent. Disabled when off, or when a keyed backend is selected without
// its key (so a half-configured backend never silently drops the tool at session build).
func (m *Manager) WebSearchOpts() agent.WebSearchOpts {
	on, backend, braveKey, tavilyKey, proxy := m.WebSearch()
	if on && backend == "brave-free" && strings.TrimSpace(braveKey) == "" {
		on = false
	}
	if on && backend == "tavily" && strings.TrimSpace(tavilyKey) == "" {
		on = false
	}
	return agent.WebSearchOpts{Enabled: on, Backend: backend, BraveKey: braveKey, TavilyKey: tavilyKey, Proxy: proxy}
}

// SetWebSearch persists and applies the web-search settings. braveKey, tavilyKey, and
// proxy are each left untouched when nil (so toggling the switch doesn't wipe a saved
// key/proxy; pass a pointer to "" to clear). Callers must rebuild agents (applyLLM)
// afterwards so the settings take effect.
func (m *Manager) SetWebSearch(on bool, backend string, braveKey, tavilyKey, proxy *string) error {
	backend = strings.TrimSpace(backend)
	if backend == "" {
		backend = defaultWebSearchBackend
	}
	if err := m.pg.SetBool(settingWebSearchOn, on); err != nil {
		return err
	}
	if err := m.pg.SetSetting(settingWebSearchBackend, backend); err != nil {
		return err
	}
	m.mu.Lock()
	m.webSearchOn = on
	m.webSearchBackend = backend
	m.mu.Unlock()
	if braveKey != nil {
		if err := m.pg.SetSetting(settingBraveKey, *braveKey); err != nil {
			return err
		}
		m.mu.Lock()
		m.braveKey = *braveKey
		m.mu.Unlock()
	}
	if tavilyKey != nil {
		if err := m.pg.SetSetting(settingTavilyKey, *tavilyKey); err != nil {
			return err
		}
		m.mu.Lock()
		m.tavilyKey = *tavilyKey
		m.mu.Unlock()
	}
	if proxy != nil {
		p := strings.TrimSpace(*proxy)
		if err := m.pg.SetSetting(settingWebSearchProxy, p); err != nil {
			return err
		}
		m.mu.Lock()
		m.webSearchProxy = p
		m.mu.Unlock()
	}
	return nil
}

// browserMCPName is the seeded Playwright MCP whose proxy args + CA env are kept
// in sync with the traffic-capture toggle.
const browserMCPName = "browser"

// syncBrowserMCPProxy reconciles the seeded browser MCP's proxy args + CA env with
// the current traffic-capture state: capture on → route Playwright through the
// recording proxy (--proxy-server) and trust its MITM CA (NODE_EXTRA_CA_CERTS);
// capture off → strip both. Idempotent, and a no-op if the user deleted/renamed the
// MCP. Must be called WITHOUT m.mu held (ProxyAddr/ProxyCACert take the lock).
func (m *Manager) syncBrowserMCPProxy() {
	servers, err := m.pg.ListMCP()
	if err != nil {
		log.Printf("[mcp] browser 代理同步: 读取 MCP 列表失败: %v", err)
		return
	}
	var srv *pgdb.MCPServer
	for _, s := range servers {
		if s.Name == browserMCPName {
			srv = s
			break
		}
	}
	if srv == nil {
		return // user removed/renamed it — leave it alone
	}

	proxy := m.ProxyAddr()  // "" when capture off
	cert := m.ProxyCACert() // "" when capture off

	args := stripProxyArgs(decodeStrSlice(srv.Args))
	env := decodeStrMap(srv.Env)
	delete(env, "NODE_EXTRA_CA_CERTS")
	if proxy != "" {
		args = append(args, "--proxy-server", proxy)
		if cert != "" {
			env["NODE_EXTRA_CA_CERTS"] = cert
		}
	}
	srv.Args = encodeJSON(args)
	srv.Env = encodeJSON(env)
	if _, err := m.pg.SaveMCP(srv); err != nil {
		log.Printf("[mcp] browser 代理同步失败: %v", err)
		return
	}
	if proxy != "" {
		log.Printf("[mcp] browser MCP 已挂捕获代理 %s (CA %s)", proxy, cert)
	} else {
		log.Printf("[mcp] browser MCP 已移除捕获代理配置")
	}
}

// stripProxyArgs removes any --proxy-server/--proxy-bypass flags (both "--flag val"
// and "--flag=val" forms) so they can be re-added cleanly from current state,
// without mutating the input slice.
func stripProxyArgs(args []string) []string {
	out := make([]string, 0, len(args))
	for i := 0; i < len(args); i++ {
		a := args[i]
		if a == "--proxy-server" || a == "--proxy-bypass" {
			i++ // skip the following value too
			continue
		}
		if strings.HasPrefix(a, "--proxy-server=") || strings.HasPrefix(a, "--proxy-bypass=") {
			continue
		}
		out = append(out, a)
	}
	return out
}

func decodeStrSlice(raw json.RawMessage) []string {
	var out []string
	if len(raw) > 0 {
		_ = json.Unmarshal(raw, &out)
	}
	return out
}

func decodeStrMap(raw json.RawMessage) map[string]string {
	out := map[string]string{}
	if len(raw) > 0 {
		_ = json.Unmarshal(raw, &out)
	}
	return out
}

func encodeJSON(v any) json.RawMessage {
	b, err := json.Marshal(v)
	if err != nil {
		return nil
	}
	return b
}

// HostTools are runtime host-provided tools added to EVERY agent's base list (via
// ToolAugment); the tools table then filters them per-agent binding. Currently the
// traffic tools, gated by the global capture switch: empty when capture is off, so
// no agent gets traffic_search/traffic_get regardless of binding.
func (m *Manager) HostTools() []actool.CoreTool {
	if m.traffic == nil || !m.TrafficEnabled() {
		return nil
	}
	return m.traffic.Tools()
}

func (m *Manager) Assets() *pgdb.AssetStore  { return m.assets }
func (m *Manager) PG() *pgdb.DB              { return m.pg }
func (m *Manager) Traffic() *traffic.Traffic { return m.traffic }

// ProxyAddr returns the recording proxy address agents route through — empty when
// traffic capture is off, so no proxy is injected (agent runs direct, no recording).
func (m *Manager) ProxyAddr() string {
	if m.traffic == nil || !m.TrafficEnabled() {
		return ""
	}
	return m.traffic.ProxyAddr()
}

// ProxyCACert returns the recording proxy's CA cert path (empty when no proxy or
// traffic capture is off), which WebFetch trusts to verify HTTPS through the MITM.
func (m *Manager) ProxyCACert() string {
	if m.traffic == nil || !m.TrafficEnabled() {
		return ""
	}
	return m.traffic.CACertPath()
}

func (m *Manager) Close() error {
	m.mu.Lock()
	defer m.mu.Unlock()
	if m.traffic != nil {
		m.traffic.Close()
	}
	return m.pg.Close()
}

// isTerminalStatus reports whether a task status is terminal (done/failed/timeout).
// Package-local shim over db.IsTerminal so all server files share one definition.
func isTerminalStatus(status string) bool { return pgdb.IsTerminal(status) }

// unixOrZero returns t's unix seconds, or 0 when the time is nil.
func unixOrZero(t *time.Time) int64 {
	if t == nil {
		return 0
	}
	return t.Unix()
}

func taskFromPG(pt *pgdb.Task, store *pgdb.ExplorationStore, ic *intercept.Interceptor) *Task {
	return &Task{
		ID: strconv.FormatInt(pt.ID, 10), ExpID: pt.ExplorationID,
		Description: pt.Description, Goal: pt.Goal, CreatedAt: pt.CreatedAt.Unix(), Paused: pt.Paused,
		CompletedAt: unixOrZero(pt.CompletedAt), Status: pt.Status, ParentRef: pt.ParentRef,
		LLMProfileID:   pt.LLMProfileID,
		TimeoutSeconds: pt.TimeoutSeconds, PlanHeartbeatSeconds: pt.PlanHeartbeatSeconds,
		FirstRunAt: unixOrZero(pt.FirstRunAt), DeadlineAt: unixOrZero(pt.DeadlineAt),
		Store: store, Guard: guard.NewWithInterceptor(ic), notify: make(chan struct{}, 1),
	}
}

// CreateTask creates a task + its exploration and makes it active.
// timeoutSeconds is the task-level wall-clock budget (0 = 不限时).
func (m *Manager) CreateTask(description, goal string, llmProfileID *int64, timeoutSeconds, planHeartbeatSeconds int) (*Task, error) {
	pt, err := m.pg.CreateTask(description, goal, llmProfileID, timeoutSeconds, planHeartbeatSeconds)
	if err != nil {
		return nil, err
	}
	t := taskFromPG(pt, m.pg.Exploration(pt.ExplorationID), m.interceptor)
	m.mu.Lock()
	m.tasks[t.ID] = t
	m.active = t.ID
	m.mu.Unlock()
	return t, nil
}

// LoadExisting rebuilds in-memory task handles from the PG task registry.
func (m *Manager) LoadExisting() []*Task {
	pts, err := m.pg.ListTasks()
	if err != nil {
		log.Printf("[manager] reload: %v", err)
		return nil
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	var loaded []*Task
	for _, pt := range pts {
		id := strconv.FormatInt(pt.ID, 10)
		if _, ok := m.tasks[id]; ok {
			continue
		}
		t := taskFromPG(pt, m.pg.Exploration(pt.ExplorationID), m.interceptor)
		m.tasks[id] = t
		loaded = append(loaded, t)
	}
	if m.active == "" {
		var newest *Task
		for _, t := range m.tasks {
			if newest == nil || t.CreatedAt > newest.CreatedAt {
				newest = t
			}
		}
		if newest != nil {
			m.active = newest.ID
		}
	}
	if len(loaded) > 0 {
		log.Printf("[manager] reloaded %d task(s) from PG", len(loaded))
	}
	return loaded
}

// SetTaskPaused persists a task's paused state.
func (m *Manager) SetTaskPaused(id string, paused bool) error {
	n, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		return err
	}
	return m.pg.SetPaused(n, paused)
}

// TaskStatus returns a task's current in-memory status (empty if unknown).
func (m *Manager) TaskStatus(id string) string {
	m.mu.RLock()
	defer m.mu.RUnlock()
	if t := m.tasks[id]; t != nil {
		return t.Status
	}
	return ""
}

// StampTaskFirstRun stamps first_run_at + deadline_at on the first real run (idempotent
// in DB) and mirrors deadline_at on the live handle. Returns the deadline unix (0 = 不限).
func (m *Manager) StampTaskFirstRun(id string) (int64, error) {
	n, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		return 0, err
	}
	m.mu.RLock()
	timeout := 0
	if t := m.tasks[id]; t != nil {
		timeout = t.TimeoutSeconds
	}
	m.mu.RUnlock()
	dl, err := m.pg.StampFirstRun(n, timeout)
	if err != nil {
		return 0, err
	}
	var dlUnix int64
	if dl != nil {
		dlUnix = dl.Unix()
	}
	m.mu.Lock()
	if t := m.tasks[id]; t != nil {
		if t.FirstRunAt == 0 {
			t.FirstRunAt = time.Now().Unix()
		}
		t.DeadlineAt = dlUnix
	}
	m.mu.Unlock()
	return dlUnix, nil
}

// SetTaskStatusGuarded sets a TERMINAL status only if the task isn't already terminal
// (resolves the completed↔timeout race — first terminal writer wins). Reflects the
// won status on the live handle. won=false means another terminal already stuck.
func (m *Manager) SetTaskStatusGuarded(id, status string) (won bool, err error) {
	n, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		return false, err
	}
	won, err = m.pg.SetTerminalStatusGuarded(n, status)
	if err != nil || !won {
		return won, err
	}
	m.mu.Lock()
	if t := m.tasks[id]; t != nil {
		t.Status = status
		if t.CompletedAt == 0 {
			t.CompletedAt = time.Now().Unix()
		}
	}
	m.mu.Unlock()
	return true, nil
}

// SetTaskStatus persists a task's lifecycle status (e.g. "done") and reflects it
// on the in-memory handle so the derived DTO status shows it without a reload.
func (m *Manager) SetTaskStatus(id, status string) error {
	n, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		return err
	}
	if err := m.pg.SetStatus(n, status); err != nil {
		return err
	}
	m.mu.Lock()
	if t := m.tasks[id]; t != nil {
		t.Status = status
		// mirror the DB's completed_at stamp on the live handle so the DTO shows the
		// finish time without a reload (terminal → stamp once; else clear).
		if pgdb.IsTerminal(status) {
			if t.CompletedAt == 0 {
				t.CompletedAt = time.Now().Unix()
			}
		} else {
			t.CompletedAt = 0
		}
	}
	m.mu.Unlock()
	return nil
}

// DeleteTask removes a task (and its exploration subgraph) from PG + memory.
func (m *Manager) DeleteTask(id string) error {
	n, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		return err
	}
	if err := m.pg.DeleteTask(n); err != nil {
		return err
	}
	m.mu.Lock()
	delete(m.tasks, id)
	if m.active == id {
		m.active = ""
		for _, t := range m.tasks {
			m.active = t.ID
			break
		}
	}
	m.mu.Unlock()
	return nil
}

func (m *Manager) Task(id string) (*Task, bool) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	t, ok := m.tasks[id]
	return t, ok
}

// ActiveTask returns the currently active task (or nil).
func (m *Manager) ActiveTask() *Task {
	m.mu.RLock()
	defer m.mu.RUnlock()
	if m.active == "" {
		return nil
	}
	return m.tasks[m.active]
}

// SetActive switches the active task. Returns false if the id is unknown.
func (m *Manager) SetActive(id string) bool {
	m.mu.Lock()
	defer m.mu.Unlock()
	if _, ok := m.tasks[id]; !ok {
		return false
	}
	m.active = id
	return true
}

func (m *Manager) ResolveTask(id string) *Task {
	if id == "" || id == "active" {
		return m.ActiveTask()
	}
	t, _ := m.Task(id)
	return t
}

func (m *Manager) List() []*Task {
	m.mu.RLock()
	defer m.mu.RUnlock()
	out := make([]*Task, 0, len(m.tasks))
	for _, t := range m.tasks {
		out = append(out, t)
	}
	sort.Slice(out, func(i, j int) bool { return out[i].CreatedAt > out[j].CreatedAt })
	return out
}

// Notify signals that the asset/exploration graph changed (debounced consumer
// wakes the planner). Non-blocking.
func (t *Task) Notify() {
	select {
	case t.notify <- struct{}{}:
	default:
	}
}

// NotifyDone is Notify plus a hint: a worker just finished intentID and that is
// what triggered this wake-up. The planner reads the accumulated triggers next
// round so it can spell out which intent finished (+ its output). Events pile up
// (debounce) until the round drains them via drainTriggers.
func (t *Task) NotifyDone(intentID int64) {
	if intentID > 0 {
		t.trigMu.Lock()
		t.pendingTriggers = append(t.pendingTriggers, agent.TriggerEvent{Kind: "done", IntentID: intentID})
		t.trigMu.Unlock()
	}
	t.Notify()
}

// NotifyFinding records that a worker reported a finding on intentID (summary),
// then wakes the planner — so the round spells out which intent found what.
func (t *Task) NotifyFinding(intentID int64, summary string) {
	t.trigMu.Lock()
	t.pendingTriggers = append(t.pendingTriggers, agent.TriggerEvent{Kind: "finding", IntentID: intentID, Detail: summary})
	t.trigMu.Unlock()
	t.Notify()
}

// NotifyGoal records that one OR MORE goals were added in a single set_goals call —
// by the human via the main agent — then wakes the planner, so the next round spells
// out "人新增了 N 个目标：…" instead of the planner having to spot new open goals in
// the overview. One call → one trigger event (set_goals 的一次批量算一条，不逐条刷屏).
// The event survives an early-returning terminal round (drain happens after the gate),
// so a set_goals that revives a done task still surfaces it once the task is running.
func (t *Task) NotifyGoal(texts []string) {
	if len(texts) == 0 {
		return
	}
	t.trigMu.Lock()
	t.pendingTriggers = append(t.pendingTriggers, agent.TriggerEvent{Kind: "goal", Goals: texts})
	t.trigMu.Unlock()
	t.Notify()
}

// drainTriggers returns and clears the trigger events accumulated since the last round.
func (t *Task) drainTriggers() []agent.TriggerEvent {
	t.trigMu.Lock()
	defer t.trigMu.Unlock()
	ev := t.pendingTriggers
	t.pendingTriggers = nil
	return ev
}