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import fs from "node:fs";
import path from "node:path";
import { classify, isTrivialSummary } from "./classifier";
import { logger } from "./logger";
import type { AgentEvent, SessionState, AgentState, TimelineLine } from "../shared/types";
/**
* Idle timer default: once an agent has received no events (tool use,
* message, or session lifecycle) for this long, the next `expireGhosts` tick
* flips it to a ghost. Kept tight (3 minutes) because the scene feels
* abandoned well before the ghost TTL below kicks in.
*
* Exposed as a per-instance field (see `SessionStore.setIdleBeforeGhostMs`)
* because the Settings UI lets the user tune it at runtime and persist the
* choice to `{app userData}/user-settings.json`. The constant here is only
* the initial value a fresh store starts with.
*/
export const DEFAULT_IDLE_BEFORE_GHOST_MS = 3 * 60 * 1000;
/**
* Ghost TTL: how long a ghost lingers in the scene (fading out) before being
* removed entirely. One hour gives users time to see "oh, that session is
* done" without flooding the scene with ancient agents forever.
*/
const GHOST_TTL_MS = 60 * 60 * 1000;
const TIMELINE_CAP = 500;
const ACTIONS_CAP = 5;
export interface SessionPatch {
sessionId: string;
changes: Array<
| { kind: "session-upsert"; session: Omit<SessionState, "agents" | "timeline"> }
| { kind: "agent-upsert"; agent: AgentState }
| { kind: "agent-remove"; agentId: string }
| { kind: "timeline-append"; line: TimelineLine }
>;
}
/**
* In-memory session state plus a tiny JSON file for the pinned-session list.
*
* We used to use `better-sqlite3` here, but the only thing we actually persist
* is a set of pinned session ids - there is no SQL to speak of, and the native
* module turned into a packaging nightmare (ABI mismatches, pnpm symlink
* issues, node-gyp/python dependencies). A flat JSON file on disk is
* dramatically simpler and works everywhere Electron does.
*
* Pass ":memory:" for `pinnedPath` in unit tests to skip all disk I/O.
*/
export class SessionStore extends EventEmitter {
private sessions = new Map<string, SessionState>();
private pinnedIds = new Set<string>();
private readonly pinnedPath: string;
// Mutable so the Settings UI can retune it at runtime via
// `setIdleBeforeGhostMs`. `expireGhosts` reads this field directly so a
// change takes effect on the very next 30s tick.
private idleBeforeGhostMs: number = DEFAULT_IDLE_BEFORE_GHOST_MS;
constructor(pinnedPath: string) {
super();
this.pinnedPath = pinnedPath === ":memory:" ? "" : pinnedPath;
this.loadPinned();
}
/**
* Update the idle-to-ghost threshold (in milliseconds). Silently clamps
* non-positive or non-finite values to the default so a bad caller cannot
* disable retirement entirely. The Settings IPC validates its input in
* minutes before converting, but this guard keeps the store robust if any
* other caller passes through.
*/
setIdleBeforeGhostMs(ms: number): void {
if (!Number.isFinite(ms) || ms <= 0) {
this.idleBeforeGhostMs = DEFAULT_IDLE_BEFORE_GHOST_MS;
return;
}
this.idleBeforeGhostMs = ms;
}
getIdleBeforeGhostMs(): number {
return this.idleBeforeGhostMs;
}
listSessions(): SessionState[] {
return Array.from(this.sessions.values());
}
getSession(id: string): SessionState | undefined {
return this.sessions.get(id);
}
isPinned(id: string): boolean {
return this.pinnedIds.has(id);
}
pin(id: string): void {
if (this.pinnedIds.has(id)) return;
this.pinnedIds.add(id);
this.flushPinned();
}
unpin(id: string): void {
if (!this.pinnedIds.has(id)) return;
this.pinnedIds.delete(id);
this.flushPinned();
}
apply(event: AgentEvent): void {
try {
this.applyInner(event);
} catch (err) {
const e = err instanceof Error ? err : new Error(String(err));
logger.warn("SessionStore apply failed", {
sessionId: event.sessionId,
agentId: event.agentId,
type: event.type,
message: e.message
});
}
}
private applyInner(event: AgentEvent): void {
logger.debug("SessionStore applying event", {
sessionId: event.sessionId,
agentId: event.agentId,
type: event.type
});
let session = this.sessions.get(event.sessionId);
if (!session) {
session = {
sessionId: event.sessionId,
projectPath: "",
startedAt: event.timestamp,
lastActivityAt: event.timestamp,
status: "active",
agents: new Map(),
timeline: []
};
this.sessions.set(event.sessionId, session);
}
// Session-title updates reflect metadata about a conversation, not
// activity. Bumping lastActivityAt for them would cause title events
// backfilled from old JSONL files to make stale sessions look active.
if (event.type !== "session-title") {
session.lastActivityAt = event.timestamp;
}
// If new activity arrives on a session we previously marked "ended"
// (e.g. the main agent emitted a Stop line but subagents kept working,
// or the user resumed the conversation), reopen it so the UI does not
// lie about a running session being over. `session-end` below will
// re-close it when the session actually ends; metadata-only events
// (session-title, subagent-end) must not reopen.
const isActivity =
event.type === "session-start" ||
event.type === "subagent-start" ||
event.type === "user-message" ||
event.type === "assistant-message" ||
event.type === "pre-tool-use" ||
event.type === "post-tool-use";
const reopened = isActivity && session.status === "ended";
if (reopened) {
session.status = "active";
}
const changes: SessionPatch["changes"] = [];
// If we just flipped the session back to active, emit a session-upsert
// up front so the renderer picks up the new status even when the
// branches below only push agent/timeline updates.
if (reopened) {
changes.push({ kind: "session-upsert", session: stripRelations(session) });
}
if (event.type === "session-start") {
logger.info("SessionStore session started", {
sessionId: event.sessionId,
agentId: event.agentId
});
session.status = "active";
const agent = this.ensureAgent(session, event.agentId, event.kind, event.parentAgentId);
agent.lastSeenAt = event.timestamp;
changes.push({ kind: "session-upsert", session: stripRelations(session) });
changes.push({ kind: "agent-upsert", agent });
} else if (event.type === "subagent-start") {
const agent = this.ensureAgent(session, event.agentId, "subagent", event.parentAgentId);
// A subagent coming back to life is not waiting on anyone.
if (agent.waitingForInput === true) agent.waitingForInput = false;
agent.lastSeenAt = event.timestamp;
changes.push({ kind: "agent-upsert", agent });
} else if (event.type === "session-end") {
logger.info("SessionStore session ended", { sessionId: event.sessionId });
session.status = "ended";
// Bump lastSeenAt on the mayor so the idle-to-ghost timer starts at the
// Stop moment, not at whatever the last tool event was. Without this, a
// session that emitted Stop minutes after its last tool would ghost
// almost immediately on the next expireGhosts tick.
const mayor = session.agents.get(event.agentId);
if (mayor) {
mayor.lastSeenAt = event.timestamp;
changes.push({ kind: "agent-upsert", agent: mayor });
}
changes.push({ kind: "session-upsert", session: stripRelations(session) });
} else if (event.type === "subagent-end") {
const agent = session.agents.get(event.agentId);
if (agent) {
agent.animation = "ghost";
agent.currentZone = "tavern";
agent.targetZone = "tavern";
agent.ghostExpiresAt = event.timestamp + GHOST_TTL_MS;
agent.lastSeenAt = event.timestamp;
// A subagent that just ended has handed control back to its
// orchestrator; until the orchestrator dispatches it again (or any
// follow-up activity arrives), it is effectively waiting for input.
// Any follow-up tool / message event clears this below.
if (agent.waitingForInput !== true) {
agent.waitingForInput = true;
}
changes.push({ kind: "agent-upsert", agent });
}
} else if (event.type === "pre-tool-use" || event.type === "post-tool-use") {
const agent = this.ensureAgent(session, event.agentId, event.kind, event.parentAgentId);
const c = classify(event);
// Any tool activity means the agent is actively working, not waiting.
if (agent.waitingForInput === true) {
agent.waitingForInput = false;
}
// Revive a ghost on activity: clear the TTL so expireGhosts will not
// despawn it, and let the classifier set the correct animation below.
if (agent.animation === "ghost") {
delete agent.ghostExpiresAt;
}
agent.lastSeenAt = event.timestamp;
// Advance the semantic zone immediately. The renderer animates the
// character between zones over time; it no longer relies on
// `currentZone` for the mount-time position (that is latched on first
// render), but keeping `currentZone` in sync with `targetZone` keeps
// other code paths (e.g. camera focus-agent, tooltips) correct.
agent.currentZone = c.zone;
agent.targetZone = c.zone;
agent.animation = c.animation;
// Never overwrite the speech bubble with empty/punctuation-only content.
// The classifier already substitutes "Done" for trivial post-tool-use
// summaries, but this guard also covers anything else upstream that
// might leak an arrow or blank string through. If the new summary is
// junk and the agent already has a readable action, keep the old one
// visible. The timeline still gets every event via the code below.
const summary = c.tooltip;
if (!isTrivialSummary(summary) || agent.recentActions.length === 0) {
agent.recentActions.push({
timestamp: event.timestamp,
zone: c.zone,
summary
});
if (agent.recentActions.length > ACTIONS_CAP) agent.recentActions.shift();
}
changes.push({ kind: "agent-upsert", agent });
const line: TimelineLine = {
id: `${event.sessionId}:${event.timestamp}:${Math.random().toString(36).slice(2, 6)}`,
timestamp: event.timestamp,
agentId: event.agentId,
agentKind: event.kind,
kind: event.type === "pre-tool-use" ? "tool-call" : "tool-result",
text: c.timelineText
};
session.timeline.push(line);
if (session.timeline.length > TIMELINE_CAP) session.timeline.shift();
changes.push({ kind: "timeline-append", line });
} else if (event.type === "session-title") {
if (event.sessionTitle) {
session.title = event.sessionTitle;
changes.push({ kind: "session-upsert", session: stripRelations(session) });
}
} else if (event.type === "user-message" || event.type === "assistant-message") {
// Track waiting-for-input on the agent the message belongs to. On an
// assistant-message, Claude has finished a turn; if it actually calls a
// tool next, the subsequent pre-tool-use clears the flag a tick later -
// a self-correcting one-frame false positive that matches the user's
// expectation: the "!" only lingers when Claude is genuinely idle.
// A user-message is the human (or orchestrator) replying, so the agent
// is no longer waiting.
const agent = this.ensureAgent(session, event.agentId, event.kind, event.parentAgentId);
const nextWaiting = event.type === "assistant-message";
const waitingChanged = (agent.waitingForInput ?? false) !== nextWaiting;
if (waitingChanged) {
if (nextWaiting) {
agent.waitingForInput = true;
} else {
agent.waitingForInput = false;
}
}
agent.lastSeenAt = event.timestamp;
// Revive a ghost on any message activity. Flip back to idle so the
// renderer stops fading the character; downstream tool events will
// pick the right work animation.
const revived = agent.animation === "ghost";
if (revived) {
agent.animation = "idle";
delete agent.ghostExpiresAt;
}
if (waitingChanged || revived) {
changes.push({ kind: "agent-upsert", agent });
}
const line: TimelineLine = {
id: `${event.sessionId}:${event.timestamp}:${Math.random().toString(36).slice(2, 6)}`,
timestamp: event.timestamp,
agentId: event.agentId,
agentKind: event.kind,
kind: event.type === "user-message" ? "user" : "assistant",
text: event.messageExcerpt ?? ""
};
session.timeline.push(line);
if (session.timeline.length > TIMELINE_CAP) session.timeline.shift();
changes.push({ kind: "timeline-append", line });
}
this.emit("patch", {
sessionId: event.sessionId,
changes
} satisfies SessionPatch);
}
/**
* Two-stage retirement sweep:
*
* 1. Non-ghost agents whose `lastSeenAt` is older than `IDLE_BEFORE_GHOST_MS`
* flip to ghost in the tavern with a fresh `GHOST_TTL_MS` countdown, and
* emit an `agent-upsert` so the renderer fades them.
* 2. Already-ghost agents whose `ghostExpiresAt` has passed get removed
* from the session and emit an `agent-remove`.
*
* Called on a timer from `ipc-bridge.ts`. Side effects are limited to
* mutating agent state inside the store and emitting patches.
*/
expireGhosts(now: number): void {
for (const session of this.sessions.values()) {
for (const agent of Array.from(session.agents.values())) {
if (agent.animation === "ghost") {
if (agent.ghostExpiresAt !== undefined && agent.ghostExpiresAt < now) {
session.agents.delete(agent.id);
this.emit("patch", {
sessionId: session.sessionId,
changes: [{ kind: "agent-remove", agentId: agent.id }]
} satisfies SessionPatch);
}
continue;
}
if (agent.lastSeenAt !== undefined && now - agent.lastSeenAt > this.idleBeforeGhostMs) {
agent.animation = "ghost";
agent.targetZone = "tavern";
agent.ghostExpiresAt = now + GHOST_TTL_MS;
this.emit("patch", {
sessionId: session.sessionId,
changes: [{ kind: "agent-upsert", agent }]
} satisfies SessionPatch);
}
}
}
}
private ensureAgent(
session: SessionState,
id: string,
kind: "main" | "subagent",
parentId?: string
): AgentState {
const existing = session.agents.get(id);
if (existing) return existing;
const state: AgentState = {
id,
kind,
currentZone: "tavern",
targetZone: "tavern",
animation: "idle",
recentActions: [],
skinColor: hashColor(id),
...(parentId !== undefined ? { parentId } : {})
};
session.agents.set(id, state);
return state;
}
private loadPinned(): void {
if (!this.pinnedPath) return;
try {
const content = fs.readFileSync(this.pinnedPath, "utf8");
const parsed: unknown = JSON.parse(content);
if (Array.isArray(parsed)) {
for (const id of parsed) if (typeof id === "string") this.pinnedIds.add(id);
}
} catch {
// Missing or malformed file - start with no pins. Not an error.
}
}
private flushPinned(): void {
if (!this.pinnedPath) return;
try {
fs.mkdirSync(path.dirname(this.pinnedPath), { recursive: true });
fs.writeFileSync(this.pinnedPath, JSON.stringify(Array.from(this.pinnedIds)));
} catch (err) {
const e = err instanceof Error ? err : new Error(String(err));
logger.warn("SessionStore flush pinned failed", {
pinnedPath: this.pinnedPath,
message: e.message
});
}
}
}
function stripRelations(s: SessionState): Omit<SessionState, "agents" | "timeline"> {
return {
sessionId: s.sessionId,
projectPath: s.projectPath,
startedAt: s.startedAt,
lastActivityAt: s.lastActivityAt,
status: s.status,
...(s.title !== undefined ? { title: s.title } : {})
};
}
function hashColor(id: string): string {
let h = 0;
for (let i = 0; i < id.length; i++) h = (h * 31 + id.charCodeAt(i)) >>> 0;
const hue = h % 360;
return `hsl(${hue} 70% 55%)`;
}
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