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import { Block, ChatbotPendingAction, ChatbotSharedState } from "@/types/chat";
import {
mapBackendBlocks,
pendingFromOutcome,
sharedStateFromSnapshot,
toSuggestionChips,
} from "./chatbotMappers";
export { mapBackendBlocks, pendingFromOutcome, sharedStateFromSnapshot, toSuggestionChips };
export interface ChatbotServiceConfig {
baseUrl: string;
getAccessToken: () => Promise<string | null>;
}
export interface ChatbotImagePayload {
data: string;
name?: string;
type?: string;
}
export interface SSEEvent {
event: string;
data: string;
}
export interface StreamCallbacks {
onDelta: (delta: string) => void;
onCompleted: (data: {
message: { text: string; blocks: Block[] };
pendingAction: ChatbotPendingAction | null;
sharedState?: ChatbotSharedState | null;
}) => void;
onError: (error: Error | any) => void;
}
export interface ChatbotService {
createThread(scope?: string, screenContext?: string): Promise<any>;
streamMessage(
threadId: string,
text: string,
callbacks: StreamCallbacks,
images?: ChatbotImagePayload[],
/**
* Stable id for THIS composed message. Pass the SAME value when retrying
* after a dropped connection: the server recognises the repeat and replays
* the stored turn instead of running the model — and charging for — the
* same message twice. Omit it and a retry is indistinguishable from a new
* message.
*/
clientMessageId?: string,
): Promise<{ abort: () => void }>;
confirmAction(threadId: string, pendingActionId: string, actionType?: string): Promise<any>;
cancelAction(threadId: string, pendingActionId: string): Promise<any>;
resetThread(threadId: string): Promise<any>;
}
const ENDPOINTS = {
THREADS: "/api/v1/chat/threads",
STREAM: (threadId: string) => `/api/v1/chat/threads/${threadId}/messages/stream`,
ACTIONS_CONFIRM: (threadId: string) => `/api/v1/chat/threads/${threadId}/actions/confirm`,
ACTIONS_CANCEL: (threadId: string) => `/api/v1/chat/threads/${threadId}/actions/cancel`,
RESET: (threadId: string) => `/api/v1/chat/threads/${threadId}/reset`,
};
function parseSSEEvents(rawChunk: string) {
const normalized = rawChunk.replace(/\r\n/g, "\n");
const parts = normalized.split("\n\n");
const rest = normalized.endsWith("\n\n") ? "" : (parts.pop() ?? "");
const events: SSEEvent[] = [];
for (const part of parts) {
const lines = part.split("\n").filter(Boolean);
if (lines.length === 0) {
continue;
}
let eventName = "message";
const dataLines: string[] = [];
for (const line of lines) {
if (line.startsWith("event:")) {
eventName = line.slice(6).trim();
continue;
}
Eif (line.startsWith("data:")) {
dataLines.push(line.slice(5).trimStart());
}
}
events.push({ event: eventName, data: dataLines.join("\n") });
}
return { events, rest };
}
export const createChatbotService = (config: ChatbotServiceConfig): ChatbotService => {
const getHeaders = async () => {
const token = await config.getAccessToken();
return {
Authorization: `Bearer ${token}`,
"Content-Type": "application/json",
Accept: "application/json",
};
};
const postAction = async (path: string, pendingActionId: string) => {
const headers = await getHeaders();
const response = await fetch(`${config.baseUrl}${path}`, {
method: "POST",
headers,
body: JSON.stringify({ pendingActionId }),
});
const payload = await response.json().catch(() => ({}));
if (!response.ok) {
throw new Error(payload?.error?.message || `Action failed (${response.status})`);
}
return payload;
};
return {
async createThread(scope?: string) {
const headers = await getHeaders();
const body = scope ? { scope } : {};
const response = await fetch(`${config.baseUrl}${ENDPOINTS.THREADS}`, {
method: "POST",
headers,
body: JSON.stringify(body),
});
const data = await response.json().catch(() => ({}) as any);
if (!response.ok) {
throw new Error(data?.error?.message || `Failed to create thread (${response.status})`);
}
const threadId = data.thread?.id || data.id;
if (!threadId) {
throw new Error("Failed to create thread (no thread id in response)");
}
// The backend seeds a fresh thread with a welcome message (assistant text +
// default suggestions), mapped through the same block path as streaming.
const welcomeBlocks = mapBackendBlocks(data.message?.blocks ?? []);
const welcomeSuggestions = Array.isArray(data.message?.suggestions)
? data.message.suggestions
: [];
const blocks = [...welcomeBlocks];
if (welcomeSuggestions.length > 0) {
blocks.push({ type: "suggestions", items: welcomeSuggestions });
}
return {
thread: {
id: threadId,
status: data.thread?.status || data.status,
},
message: blocks.length > 0 ? { text: data.message?.text || "", blocks } : undefined,
};
},
async streamMessage(threadId, text, callbacks, images, clientMessageId) {
const token = await config.getAccessToken();
const url = `${config.baseUrl}${ENDPOINTS.STREAM(threadId)}`;
const xhr = new XMLHttpRequest();
xhr.open("POST", url);
xhr.setRequestHeader("Authorization", `Bearer ${token}`);
xhr.setRequestHeader("Content-Type", "application/json");
xhr.setRequestHeader("Accept", "text/event-stream");
let seenBytes = 0;
let aborted = false;
let sseBuffer = "";
let hasErrored = false;
let completed = false;
// Per-turn accumulators — folded from the AG-UI event stream.
let streamedText = "";
let finalBlocks: Block[] = [];
let suggestionItems: string[] = [];
let pendingAction: ChatbotPendingAction | null = null;
let sharedState: any = null;
const complete = () => {
Iif (completed || hasErrored) return;
completed = true;
const blocks = [...finalBlocks];
if (suggestionItems.length > 0) {
blocks.push({ type: "suggestions", items: suggestionItems });
}
callbacks.onCompleted({
message: { text: streamedText, blocks },
pendingAction,
sharedState,
});
};
const handleAgUiEvent = (payload: any) => {
switch (payload?.type) {
case "TEXT_MESSAGE_CONTENT":
if (typeof payload.delta === "string" && payload.delta.length > 0) {
streamedText += payload.delta;
callbacks.onDelta(payload.delta);
}
break;
case "CUSTOM":
if (payload.name === "message.blocks" && payload.value) {
finalBlocks = mapBackendBlocks(payload.value.blocks ?? []);
suggestionItems = Array.isArray(payload.value.suggestions)
? payload.value.suggestions
: [];
}
break;
case "STATE_SNAPSHOT":
sharedState = sharedStateFromSnapshot(payload.snapshot);
break;
case "RUN_FINISHED":
pendingAction = pendingFromOutcome(payload.outcome);
if (pendingAction && sharedState?.pendingAction?.expiresAt) {
pendingAction.expiresAt = sharedState.pendingAction.expiresAt;
}
complete();
break;
case "RUN_ERROR":
if (!hasErrored) {
hasErrored = true;
callbacks.onError(new Error(payload.message || "Agent run failed."));
}
break;
default:
// RUN_STARTED / TEXT_MESSAGE_START|END / TOOL_CALL_* / message.metadata
break;
}
};
xhr.onreadystatechange = () => {
if (aborted) return;
Eif (xhr.readyState === 3 || xhr.readyState === 4) {
const newData = xhr.responseText.substring(seenBytes);
seenBytes = xhr.responseText.length;
if (newData) {
sseBuffer += newData;
const { events, rest } = parseSSEEvents(sseBuffer);
sseBuffer = rest;
for (const streamEvent of events) {
Iif (!streamEvent.data) continue;
try {
const payload = JSON.parse(streamEvent.data);
if (streamEvent.event === "error") {
Eif (!hasErrored) {
hasErrored = true;
callbacks.onError(payload.error || payload);
}
continue;
}
handleAgUiEvent(payload);
} catch {
// Ignore malformed / keep-alive frames.
}
}
}
}
if (xhr.readyState === 4) {
if ((xhr.status < 200 || xhr.status >= 300) && !hasErrored) {
hasErrored = true;
callbacks.onError(new Error(`HTTP ${xhr.status}: ${xhr.responseText}`));
} else if (!completed && !hasErrored) {
// Stream closed without an explicit RUN_FINISHED — surface what we have.
complete();
}
}
};
xhr.onerror = () => {
if (aborted || hasErrored) return;
hasErrored = true;
callbacks.onError(new Error("Network error"));
};
xhr.send(
JSON.stringify({
message: text,
...(clientMessageId ? { clientMessageId } : {}),
...(images && images.length > 0
? {
images: images.map((image, index) => ({
name: image.name || `image-${index}`,
mimeType: image.type || "image/jpeg",
url: image.data,
})),
}
: {}),
}),
);
return {
abort: () => {
aborted = true;
xhr.abort();
},
};
},
async confirmAction(threadId: string, pendingActionId: string, actionType?: string) {
const payload = await postAction(ENDPOINTS.ACTIONS_CONFIRM(threadId), pendingActionId);
// The backend knows best what it just did; the caller's pending action
// type is the fallback for agent builds that don't echo it back.
const resolvedActionType =
typeof payload?.actionType === "string" ? payload.actionType : actionType;
// A confirm never runs a turn, so nothing streams in behind the success
// card. The agent ships its closing line and the next-step chips in the
// confirm response instead; without them the thread dead-ends on a
// receipt. Both are optional — an older agent build simply omits them.
const followUpMessage =
typeof payload?.followUpMessage === "string" ? payload.followUpMessage.trim() : "";
const suggestions = toSuggestionChips(payload?.suggestions);
return {
message: {
text: "Request confirmed.",
blocks: [
{
type: "status",
status: "success",
title: confirmedCardTitle(resolvedActionType),
description: `Status: ${payload?.status ?? "completed"}.`,
// Affected people (username/role/avatar) — rendered as rows
// inside the success card when the backend provides them.
...(payload?.data?.information ? { data: payload.data } : {}),
},
...(followUpMessage ? [{ type: "text", text: followUpMessage }] : []),
// Chips are read off the latest bot turn's suggestions block, so
// they have to ride this message to reach the composer strip.
...(suggestions.length > 0 ? [{ type: "suggestions", items: suggestions }] : []),
] as Block[],
},
};
},
async cancelAction(threadId: string, pendingActionId: string) {
await postAction(ENDPOINTS.ACTIONS_CANCEL(threadId), pendingActionId);
return {
message: {
text: "Request cancelled.",
blocks: [{ type: "status", status: "cancelled", title: "Cancelled" }] as Block[],
},
};
},
async resetThread(threadId: string) {
const headers = await getHeaders();
const response = await fetch(`${config.baseUrl}${ENDPOINTS.RESET(threadId)}`, {
method: "POST",
headers,
});
return response.json();
},
};
};
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