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import { useState, useCallback, useRef, useEffect, useMemo } from "react";
import { TASK_SUBSCRIBE_ENDPOINT } from "../lib/api";
import type { TaskOutputEvent } from "./useTaskSubscription";
export interface MultiTaskOutputEntry extends TaskOutputEvent {
/** Label for the task (e.g. step name or "Orchestrator") */
taskLabel: string;
/** Timestamp when the entry was received */
receivedAt: number;
}
interface UseMultiTaskSubscriptionOptions {
/** Map of taskId -> label */
taskMap: Map<string, string>;
/** Whether to actively subscribe */
enabled?: boolean;
/** Max entries to keep in buffer */
maxEntries?: number;
}
export function useMultiTaskSubscription(options: UseMultiTaskSubscriptionOptions) {
const { taskMap, enabled = true, maxEntries = 2000 } = options;
const [connected, setConnected] = useState(false);
const [entries, setEntries] = useState<MultiTaskOutputEntry[]>([]);
const wsRef = useRef<WebSocket | null>(null);
const reconnectTimeoutRef = useRef<number | null>(null);
const subscribedTasksRef = useRef<Set<string>>(new Set());
const taskMapRef = useRef(taskMap);
const enabledRef = useRef(enabled);
// Keep refs in sync
useEffect(() => {
taskMapRef.current = taskMap;
}, [taskMap]);
useEffect(() => {
enabledRef.current = enabled;
}, [enabled]);
// Derive task IDs from the map
const taskIds = useMemo(() => Array.from(taskMap.keys()), [taskMap]);
const subscribeToTask = useCallback((ws: WebSocket, taskId: string) => {
if (ws.readyState === WebSocket.OPEN) {
ws.send(JSON.stringify({ type: "subscribeOutput", taskId }));
subscribedTasksRef.current.add(taskId);
}
}, []);
const unsubscribeFromTask = useCallback((ws: WebSocket, taskId: string) => {
if (ws.readyState === WebSocket.OPEN) {
ws.send(JSON.stringify({ type: "unsubscribeOutput", taskId }));
subscribedTasksRef.current.delete(taskId);
}
}, []);
const connect = useCallback(() => {
const currentState = wsRef.current?.readyState;
if (currentState === WebSocket.OPEN || currentState === WebSocket.CONNECTING) {
return;
}
if (wsRef.current && currentState === WebSocket.CLOSING) {
wsRef.current = null;
}
try {
const ws = new WebSocket(TASK_SUBSCRIBE_ENDPOINT);
wsRef.current = ws;
ws.onopen = () => {
setConnected(true);
// Re-subscribe to all tasks
for (const taskId of subscribedTasksRef.current) {
ws.send(JSON.stringify({ type: "subscribeOutput", taskId }));
}
};
ws.onmessage = (event) => {
try {
const message = JSON.parse(event.data);
if (message.type === "taskOutput") {
const label = taskMapRef.current.get(message.taskId) || message.taskId;
const entry: MultiTaskOutputEntry = {
taskId: message.taskId,
messageType: message.messageType,
content: message.content,
toolName: message.toolName,
toolInput: message.toolInput,
isError: message.isError,
costUsd: message.costUsd,
durationMs: message.durationMs,
isPartial: message.isPartial,
taskLabel: label,
receivedAt: Date.now(),
};
setEntries((prev) => {
const next = [...prev, entry];
if (next.length > maxEntries) {
return next.slice(next.length - maxEntries);
}
return next;
});
}
} catch (e) {
console.error("Failed to parse multi-task subscription message:", e);
}
};
ws.onerror = () => {
console.error("Multi-task WebSocket connection error");
};
ws.onclose = () => {
setConnected(false);
wsRef.current = null;
// Reconnect if we still have subscriptions
if (subscribedTasksRef.current.size > 0 && enabledRef.current) {
reconnectTimeoutRef.current = window.setTimeout(() => {
connect();
}, 3000);
}
};
} catch (e) {
console.error("Failed to connect multi-task subscription:", e);
}
}, [maxEntries]);
// Manage subscriptions when task IDs change
useEffect(() => {
if (!enabled || taskIds.length === 0) {
// Close connection if no tasks
if (wsRef.current) {
subscribedTasksRef.current.clear();
wsRef.current.close();
wsRef.current = null;
}
return;
}
const newTaskIds = new Set(taskIds);
const ws = wsRef.current;
if (!ws || ws.readyState !== WebSocket.OPEN) {
// Set desired subscriptions and connect
subscribedTasksRef.current = newTaskIds;
connect();
return;
}
// Unsubscribe from removed tasks
for (const existingId of subscribedTasksRef.current) {
if (!newTaskIds.has(existingId)) {
unsubscribeFromTask(ws, existingId);
}
}
// Subscribe to new tasks
for (const newId of newTaskIds) {
if (!subscribedTasksRef.current.has(newId)) {
subscribeToTask(ws, newId);
}
}
}, [taskIds, enabled, connect, subscribeToTask, unsubscribeFromTask]);
// Cleanup on unmount
useEffect(() => {
return () => {
if (reconnectTimeoutRef.current) {
clearTimeout(reconnectTimeoutRef.current);
}
if (wsRef.current) {
wsRef.current.close();
}
};
}, []);
const clearEntries = useCallback(() => {
setEntries([]);
}, []);
return {
connected,
entries,
clearEntries,
};
}
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