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import type {
ImageAttachment,
LiveSession,
LiveSessionRuntime,
LiveSessionSnapshot,
TimelineItem,
UsagePayload,
WebEvent,
} from "./types";
export type ConnectionState = "disconnected" | "connecting" | "connected";
export type SubAgentState = {
title: string;
status: string;
};
export type SessionRuntimeState = {
liveSessionId: string | null;
sessionId: string | null;
runtime: LiveSessionRuntime | null;
connection: ConnectionState;
inputEnabled: boolean;
waitMessage: string | null;
sessionUsage: UsagePayload | null;
turnUsage: { usage: UsagePayload | null; elapsedSeconds?: number } | null;
sessionEnded: boolean;
fatalError: string | null;
items: TimelineItem[];
itemsVersion: number;
subAgents: Record<string, SubAgentState>;
lastEventSeq: number;
};
type SessionStore = {
activeSessionKey: string | null;
sessionsByKey: Record<string, SessionRuntimeState>;
liveSessionIndex: Record<string, string>;
sessionIndex: Record<string, string>;
setActiveSession: (sessionKey: string | null) => void;
hydrateSavedSession: (sessionId: string, items?: TimelineItem[], lastEventSeq?: number) => void;
attachLiveSession: (
sessionKey: string,
session: LiveSession,
options?: { preserveItems?: boolean },
) => string;
hydrateLiveSnapshot: (
sessionKey: string,
session: LiveSession,
snapshot: LiveSessionSnapshot,
) => string;
updateRuntimeFromSession: (sessionKey: string, session: LiveSession) => void;
setConnection: (sessionKey: string, connection: ConnectionState) => void;
applyEvent: (sessionKey: string, event: WebEvent) => string;
};
function createEmptySessionState(sessionId: string | null = null): SessionRuntimeState {
return {
liveSessionId: null,
sessionId,
runtime: null,
connection: "disconnected",
inputEnabled: false,
waitMessage: null,
sessionUsage: null,
turnUsage: null,
sessionEnded: false,
fatalError: null,
items: [],
itemsVersion: 0,
subAgents: {},
lastEventSeq: 0,
};
}
export function getSavedSessionKey(sessionId: string): string {
return `session:${sessionId}`;
}
export function getLiveSessionKey(liveSessionId: string): string {
return `live:${liveSessionId}`;
}
function runtimeFromSession(session: LiveSession): LiveSessionRuntime {
return {
provider_id: session.provider_id,
profile_id: session.profile_id,
provider: session.provider,
model: session.model,
reasoning_effort: session.reasoning_effort,
};
}
function upsertItem(items: TimelineItem[], nextItem: TimelineItem): TimelineItem[] {
const index = items.findIndex((item) => item.itemId === nextItem.itemId);
if (index === -1) {
return [...items, nextItem];
}
const updated = [...items];
updated[index] = nextItem;
return updated;
}
function readString(value: unknown, fallback = ""): string {
return typeof value === "string" ? value : fallback;
}
function readOptionalString(value: unknown): string | undefined {
return typeof value === "string" ? value : undefined;
}
function readTimelineRole(
value: unknown,
): "user" | "assistant" | "notice" | "error" | "debug" {
switch (value) {
case "user":
case "assistant":
case "notice":
case "error":
case "debug":
return value;
default:
return "assistant";
}
}
function isImageAttachment(value: unknown): value is ImageAttachment {
if (value === null || typeof value !== "object") {
return false;
}
return "upload_id" in value
&& typeof (value as { upload_id: unknown }).upload_id === "string";
}
function mapSnapshotItem(raw: Record<string, unknown>): TimelineItem | null {
const kind = raw.kind;
const itemId = typeof raw.itemId === "string" ? raw.itemId : null;
if (!itemId || typeof kind !== "string") return null;
if (kind === "message") {
return {
kind: "message",
itemId,
role: readTimelineRole(raw.role),
content: readString(raw.content),
filePaths: Array.isArray(raw.file_paths)
? raw.file_paths.filter((value): value is string => typeof value === "string")
: undefined,
imageAttachments: Array.isArray(raw.image_attachments)
? raw.image_attachments.filter(isImageAttachment)
: undefined,
markdown: Boolean(raw.markdown),
subAgentId: readOptionalString(raw.sub_agent_id),
};
}
if (kind === "thinking") {
return {
kind: "thinking",
itemId,
title: readString(raw.title, "Thinking"),
content: readString(raw.content),
subAgentId: readOptionalString(raw.sub_agent_id),
};
}
if (kind === "tool_group") {
return {
kind: "tool_group",
itemId,
label: readString(raw.label, "Tool calls"),
items: Array.isArray(raw.items)
? (raw.items as { text: string; classes?: string }[])
: [],
subAgentId: readOptionalString(raw.sub_agent_id),
};
}
return null;
}
function moveSessionState(
state: SessionStore,
fromKey: string,
toKey: string,
): SessionStore {
if (fromKey === toKey || !(fromKey in state.sessionsByKey)) {
return state;
}
const sessionState = state.sessionsByKey[fromKey];
const nextSessionsByKey = { ...state.sessionsByKey };
delete nextSessionsByKey[fromKey];
nextSessionsByKey[toKey] = sessionState;
const nextLiveSessionIndex = Object.fromEntries(
Object.entries(state.liveSessionIndex).map(([id, key]) => [id, key === fromKey ? toKey : key]),
);
const nextSessionIndex = Object.fromEntries(
Object.entries(state.sessionIndex).map(([id, key]) => [id, key === fromKey ? toKey : key]),
);
return {
...state,
sessionsByKey: nextSessionsByKey,
liveSessionIndex: nextLiveSessionIndex,
sessionIndex: nextSessionIndex,
activeSessionKey: state.activeSessionKey === fromKey ? toKey : state.activeSessionKey,
};
}
export const useSessionStore = create<SessionStore>((set) => ({
activeSessionKey: null,
sessionsByKey: {},
liveSessionIndex: {},
sessionIndex: {},
setActiveSession: (sessionKey) => set({ activeSessionKey: sessionKey }),
hydrateSavedSession: (sessionId, items = [], lastEventSeq) =>
set((state) => {
const sessionKey = getSavedSessionKey(sessionId);
const current = state.sessionsByKey[sessionKey] ?? createEmptySessionState(sessionId);
return {
...state,
sessionsByKey: {
...state.sessionsByKey,
[sessionKey]: {
...current,
sessionId,
items,
itemsVersion: items.length,
fatalError: null,
// Reset live-session state so revisiting a saved session
// does not keep stale liveSessionId / connection / flags
// from a previously ended session.
liveSessionId: null,
connection: "disconnected",
inputEnabled: false,
waitMessage: null,
sessionEnded: false,
// Set lastEventSeq from the server so the WS snapshot
// replay skips events already covered by API history.
// Use the server value directly (not Math.max) because the
// current value may belong to a previous, ended live session
// whose seq space is unrelated.
lastEventSeq: typeof lastEventSeq === "number"
? lastEventSeq
: 0,
},
},
sessionIndex: { ...state.sessionIndex, [sessionId]: sessionKey },
};
}),
attachLiveSession: (sessionKey, session, options = {}) => {
let resolvedKey = sessionKey;
set((state) => {
resolvedKey = session.session_id ? getSavedSessionKey(session.session_id) : sessionKey;
let nextState = state;
if (sessionKey !== resolvedKey) {
nextState = moveSessionState(state, sessionKey, resolvedKey);
}
const current =
nextState.sessionsByKey[resolvedKey]
?? createEmptySessionState(session.session_id);
return {
...nextState,
sessionsByKey: {
...nextState.sessionsByKey,
[resolvedKey]: {
...current,
liveSessionId: session.live_session_id,
sessionId: session.session_id,
runtime: runtimeFromSession(session),
inputEnabled: false,
waitMessage: null,
sessionUsage: options.preserveItems ? current.sessionUsage : null,
turnUsage: options.preserveItems ? current.turnUsage : null,
sessionEnded: session.status === "ended",
fatalError: session.fatal_error,
items: options.preserveItems ? current.items : [],
itemsVersion: options.preserveItems ? current.itemsVersion : 0,
subAgents: options.preserveItems ? current.subAgents : {},
// When reattaching the same live session, carry forward the
// high-water mark so the WS snapshot replay skips events
// already covered by API history. When attaching a *new*
// live session (seq restarts from 1), reset to the server's
// value so we don't suppress the new session's events.
lastEventSeq:
current.liveSessionId === session.live_session_id
? Math.max(
current.lastEventSeq,
typeof session.last_event_seq === "number" ? session.last_event_seq : 0,
)
: (typeof session.last_event_seq === "number" ? session.last_event_seq : 0),
},
},
liveSessionIndex: {
...nextState.liveSessionIndex,
[session.live_session_id]: resolvedKey,
},
sessionIndex: session.session_id
? { ...nextState.sessionIndex, [session.session_id]: resolvedKey }
: nextState.sessionIndex,
};
});
return resolvedKey;
},
hydrateLiveSnapshot: (sessionKey, session, snapshot) => {
let resolvedKey = sessionKey;
set((state) => {
resolvedKey = snapshot.session_id ? getSavedSessionKey(snapshot.session_id) : sessionKey;
let nextState = state;
if (sessionKey !== resolvedKey) {
nextState = moveSessionState(state, sessionKey, resolvedKey);
}
const current =
nextState.sessionsByKey[resolvedKey]
?? createEmptySessionState(snapshot.session_id);
const items = snapshot.items
.map((item) => mapSnapshotItem(item))
.filter((item): item is TimelineItem => item !== null);
return {
...nextState,
sessionsByKey: {
...nextState.sessionsByKey,
[resolvedKey]: {
...current,
liveSessionId: session.live_session_id,
sessionId: snapshot.session_id,
runtime: runtimeFromSession(session),
inputEnabled: snapshot.input_enabled,
waitMessage: snapshot.wait_message,
sessionUsage: snapshot.session_usage,
turnUsage: snapshot.turn_usage
? {
usage: snapshot.turn_usage.usage,
elapsedSeconds:
typeof snapshot.turn_usage.elapsed_seconds === "number"
? snapshot.turn_usage.elapsed_seconds
: undefined,
}
: null,
sessionEnded: snapshot.session_ended,
fatalError: snapshot.fatal_error,
items,
itemsVersion: items.length,
subAgents: snapshot.sub_agents,
lastEventSeq: snapshot.last_event_seq,
},
},
liveSessionIndex: {
...nextState.liveSessionIndex,
[session.live_session_id]: resolvedKey,
},
sessionIndex: snapshot.session_id
? { ...nextState.sessionIndex, [snapshot.session_id]: resolvedKey }
: nextState.sessionIndex,
};
});
return resolvedKey;
},
updateRuntimeFromSession: (sessionKey, session) =>
set((state) => {
const current = state.sessionsByKey[sessionKey];
if (!current) return state;
return {
...state,
sessionsByKey: {
...state.sessionsByKey,
[sessionKey]: {
...current,
runtime: runtimeFromSession(session),
},
},
};
}),
setConnection: (sessionKey, connection) =>
set((state) => {
const current = state.sessionsByKey[sessionKey] ?? createEmptySessionState();
return {
...state,
sessionsByKey: {
...state.sessionsByKey,
[sessionKey]: { ...current, connection },
},
};
}),
applyEvent: (sessionKey, event) => {
let resolvedKey = sessionKey;
set((state) => {
const payload = event.payload;
const nextSessionId =
typeof payload.session_id === "string" ? payload.session_id : null;
resolvedKey = nextSessionId ? getSavedSessionKey(nextSessionId) : sessionKey;
let nextState = state;
if (sessionKey !== resolvedKey) {
nextState = moveSessionState(state, sessionKey, resolvedKey);
}
const current =
nextState.sessionsByKey[resolvedKey]
?? createEmptySessionState(nextSessionId);
// Skip events already processed — prevents duplicates when the
// WebSocket reconnects and replays its snapshot over items that
// were already hydrated from the API (which use different itemIds).
if (event.seq <= current.lastEventSeq) {
return nextState;
}
const patch: Partial<SessionRuntimeState> = { lastEventSeq: event.seq };
switch (event.type) {
case "session_reset":
patch.items = [];
patch.itemsVersion = 0;
patch.subAgents = {};
patch.waitMessage = null;
patch.turnUsage = null;
patch.sessionEnded = false;
patch.fatalError = null;
break;
case "session_identity":
patch.sessionId = nextSessionId;
break;
case "input_state":
patch.inputEnabled = Boolean(payload.enabled);
break;
case "wait_state":
patch.waitMessage = payload.active
? readString(payload.message, "Working...")
: null;
break;
case "usage_updated":
if (payload.scope === "session") {
patch.sessionUsage = payload.usage as UsagePayload;
} else {
patch.turnUsage = {
usage: payload.usage as UsagePayload,
elapsedSeconds:
typeof payload.elapsed_seconds === "number" ? payload.elapsed_seconds : undefined,
};
}
break;
case "message_added": {
const item: TimelineItem = {
kind: "message",
itemId: String(payload.item_id),
role: readTimelineRole(payload.role),
content: readString(payload.content),
filePaths: Array.isArray(payload.file_paths)
? payload.file_paths.filter((value): value is string => typeof value === "string")
: undefined,
imageAttachments: Array.isArray(payload.image_attachments)
? payload.image_attachments.filter(isImageAttachment)
: undefined,
markdown: Boolean(payload.markdown),
subAgentId: readOptionalString(payload.sub_agent_id),
};
patch.items = upsertItem(current.items, item);
patch.itemsVersion = current.itemsVersion + 1;
break;
}
case "thinking_updated": {
const item: TimelineItem = {
kind: "thinking",
itemId: String(payload.item_id),
title: readString(payload.title, "Thinking"),
content: readString(payload.content),
subAgentId: readOptionalString(payload.sub_agent_id),
};
patch.items = upsertItem(current.items, item);
patch.itemsVersion = current.itemsVersion + 1;
break;
}
case "tool_group_added": {
const item: TimelineItem = {
kind: "tool_group",
itemId: String(payload.item_id),
label: readString(payload.label, "Tool calls"),
items: Array.isArray(payload.items)
? (payload.items as { text: string; classes?: string }[])
: [],
subAgentId: readOptionalString(payload.sub_agent_id),
};
patch.items = upsertItem(current.items, item);
patch.itemsVersion = current.itemsVersion + 1;
break;
}
case "sub_agent_state": {
const subAgentId = readString(payload.sub_agent_id);
patch.subAgents = {
...current.subAgents,
[subAgentId]: {
title: readString(payload.title, "sub_agent"),
status: readString(payload.status, "running"),
},
};
break;
}
case "session_state":
patch.sessionId = nextSessionId;
if (payload.state === "ended") {
patch.sessionEnded = true;
patch.inputEnabled = false;
patch.waitMessage = null;
patch.fatalError =
typeof payload.fatal_error === "string" ? payload.fatal_error : null;
} else {
patch.sessionEnded = false;
patch.fatalError = null;
}
break;
case "session_runtime_updated":
if (
typeof payload.provider === "string"
&& typeof payload.model === "string"
&& typeof payload.reasoning_effort === "string"
) {
patch.runtime = {
provider_id:
typeof payload.provider_id === "string" ? payload.provider_id : null,
profile_id:
typeof payload.profile_id === "string" ? payload.profile_id : null,
provider: payload.provider,
model: payload.model,
reasoning_effort: payload.reasoning_effort,
};
}
break;
default:
break;
}
const nextSessionState: SessionRuntimeState = {
...current,
...patch,
sessionId: patch.sessionId ?? current.sessionId,
};
const nextLiveSessionIndex = current.liveSessionId
? { ...nextState.liveSessionIndex, [current.liveSessionId]: resolvedKey }
: nextState.liveSessionIndex;
const nextSessionIndex = nextSessionState.sessionId
? { ...nextState.sessionIndex, [nextSessionState.sessionId]: resolvedKey }
: nextState.sessionIndex;
return {
...nextState,
sessionsByKey: {
...nextState.sessionsByKey,
[resolvedKey]: nextSessionState,
},
liveSessionIndex: nextLiveSessionIndex,
sessionIndex: nextSessionIndex,
};
});
return resolvedKey;
},
}));
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