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import { createContext, useContextSelector } from "use-context-selector";
import { useChatbotRuntime } from "@/contexts/ChatbotRuntimeContext";
import { BOT, USER } from "@/constants/chat";
import { Block, ChatMessage } from "@/types/chat";
import type { StreamCallbacks } from "@/services/chatbotService";
export { BOT, USER };
type SelectedImage = {
uri: string;
fileName?: string;
type?: string;
base64?: string;
};
const hasUrlScheme = (value: string) => /^[a-z][a-z0-9+.-]*:/i.test(value.trim());
const resolveImageData = (image: SelectedImage | null) => {
if (!image) return null;
const base64Value = image.base64?.trim() || "";
if (!base64Value) {
return null;
}
if (base64Value.startsWith("data:")) {
return base64Value;
}
// Reject URL-like values (http, https, blob, file, etc.). The composer only sends uploaded image data.
if (hasUrlScheme(base64Value)) {
return null;
}
return `data:${image.type || "image/jpeg"};base64,${base64Value}`;
};
export interface ChatState {
messages: ChatMessage[];
threadId: string | null;
text: string;
isStreaming: boolean;
isInitializing: boolean;
initError: string | null;
processingActionIds: string[];
selectedImage: SelectedImage | null;
userName: string | undefined;
}
export interface ChatActions {
setText: (text: string) => void;
setSelectedImage: (img: SelectedImage | null) => void;
/** Resolves false when the message was rejected and the composer must keep its content. */
onSend: (overrideText?: string) => Promise<boolean>;
onReset: () => Promise<void>;
handleCancel: () => void;
handleAction: (msgId: string, actionId: string, type: "confirm" | "cancel") => Promise<void>;
setMessages: (messages: ChatMessage[] | ((prev: ChatMessage[]) => ChatMessage[])) => void;
setThreadId: (id: string | null) => void;
clearChat: () => void;
initThread: () => Promise<void>;
}
interface ChatContextValue {
state: ChatState;
actions: ChatActions;
}
const ChatbotContext = createContext<ChatContextValue | null>(null);
const useChatbotSelector = <T,>(selector: (ctx: ChatContextValue) => T): T => {
return useContextSelector(ChatbotContext, (ctx) => {
if (!ctx) {
throw new Error("Chatbot context hooks must be used within ChatbotContextProvider");
}
return selector(ctx);
});
};
export const useChatStateSelector = <T,>(selector: (state: ChatState) => T): T =>
useChatbotSelector((ctx) => selector(ctx.state));
export const useChatActionsSelector = <T,>(selector: (actions: ChatActions) => T): T =>
useChatbotSelector((ctx) => selector(ctx.actions));
interface CachedChatState {
userId: string;
messages: ChatMessage[];
threadId: string | null;
}
let cachedChatState: CachedChatState | null = null;
const ChatbotContextProviderForUser = ({
children,
userId,
}: {
children: ReactNode;
userId: string | null;
}) => {
const { meta } = useChatbotRuntime();
const { service, scope, screenContext, userName } = meta;
const initialCache = cachedChatState?.userId === userId ? cachedChatState : null;
const [messages, setMessages] = useState<ChatMessage[]>(initialCache?.messages ?? []);
const [threadId, setThreadId] = useState<string | null>(initialCache?.threadId ?? null);
const [text, setText] = useState("");
const [isStreaming, setIsStreaming] = useState(false);
const [isInitializing, setIsInitializing] = useState(false);
const [initError, setInitError] = useState<string | null>(null);
const [processingActionIds, setProcessingActionIds] = useState<string[]>([]);
const [selectedImage, setSelectedImage] = useState<SelectedImage | null>(null);
useEffect(() => {
if (!userId) return;
cachedChatState = { userId, messages, threadId };
}, [messages, threadId, userId]);
const abortControllerRef = useRef<{ abort: () => void } | null>(null);
const textRef = useRef(text);
textRef.current = text;
const messagesRef = useRef(messages);
messagesRef.current = messages;
const selectedImageRef = useRef(selectedImage);
selectedImageRef.current = selectedImage;
useEffect(
() => () => {
abortControllerRef.current?.abort();
abortControllerRef.current = null;
},
[],
);
const initThread = useCallback(async () => {
if (threadId) return;
setIsInitializing(true);
setInitError(null);
try {
const res = await service.createThread(scope, screenContext);
setInitError(null);
setThreadId(res.thread.id);
if (res.message) {
const welcomeMsg: ChatMessage = {
_id: `welcome_${Date.now()}`,
text: res.message.text || "Welcome!",
createdAt: new Date(),
user: BOT,
// No local greeting block: the welcome screen already greets the
// user by name in its heading, and a second one here both repeated
// it and shadowed the agent's own sentence about what it supports.
blocks: res.message.blocks || [],
};
setMessages([welcomeMsg]);
}
} catch (error: any) {
console.error("Failed to init thread", error);
setInitError(
error?.message ||
"Failed to initialize conversation. Please check your connection and try again.",
);
} finally {
setIsInitializing(false);
}
}, [threadId, service, scope, screenContext]);
const clearChat = useCallback(() => {
setMessages([]);
setThreadId(null);
setText("");
setSelectedImage(null);
setIsStreaming(false);
setProcessingActionIds([]);
setInitError(null);
}, []);
const onSend = useCallback(
async (overrideText?: string) => {
const finalText = (overrideText ?? textRef.current).trim();
if ((!finalText && !selectedImageRef.current) || isStreaming) return false;
if (!threadId) {
setInitError("The conversation is still starting. Please try again in a moment.");
return false;
}
setText("");
const currentImage = selectedImageRef.current;
setSelectedImage(null);
const userMsgs: ChatMessage[] = [];
const timestamp = Date.now();
// Identity of THIS composed message, minted once here rather than per
// send attempt. The server keys retry detection on it: re-sending with
// the same id replays the stored turn instead of running the model a
// second time. A per-attempt id would defeat that entirely.
const clientMessageId = `${threadId}:${timestamp}:${Math.random().toString(36).slice(2, 10)}`;
Eif (finalText) {
userMsgs.push({
_id: `u_txt_${timestamp}`,
text: finalText,
createdAt: new Date(),
user: USER,
});
}
if (currentImage) {
userMsgs.push({
_id: `u_img_${timestamp}`,
text: "",
createdAt: new Date(),
user: USER,
image: currentImage.uri,
});
}
setMessages((prev) => {
const withoutWelcome = prev.filter((m) => !String(m._id).startsWith("welcome_"));
return [...userMsgs, ...withoutWelcome];
});
setIsStreaming(true);
const botMsgId = `b_${Date.now()}`;
const botMsg: ChatMessage = {
_id: botMsgId,
text: "",
createdAt: new Date(),
user: BOT,
blocks: [{ type: "text", text: "", isStreaming: true }],
};
setMessages((prev) => [botMsg, ...prev]);
const resolvedImageData = resolveImageData(currentImage);
const imagePayload = resolvedImageData
? [
{
data: resolvedImageData,
name: currentImage?.fileName,
type: currentImage?.type,
},
]
: undefined;
const markStreamFailed = (message: string) => {
setIsStreaming(false);
abortControllerRef.current = null;
setMessages((prev) =>
prev.map((m) =>
m._id === botMsgId
? {
...m,
blocks: [
...(m.blocks?.map((b) => ({ ...b, isStreaming: false })) || []),
{ type: "error", text: message },
],
}
: m,
),
);
};
const streamCallbacks: StreamCallbacks = {
onDelta: (delta) => {
setMessages((prev) =>
prev.map((m) => {
if (m._id === botMsgId) {
const newText = m.text + delta;
const newBlocks = m.blocks?.map((b, i) =>
i === 0 && b.type === "text" ? { ...b, text: newText } : b,
);
return { ...m, text: newText, blocks: newBlocks };
}
return m;
}),
);
},
onCompleted: (data) => {
setIsStreaming(false);
abortControllerRef.current = null;
setMessages((prev) =>
prev.map((m) =>
m._id === botMsgId
? {
...m,
text: data.message.text || m.text,
blocks: data.message.blocks?.map((b: Block) => ({
...b,
isStreaming: false,
})),
pendingAction: data.pendingAction,
}
: m,
),
);
},
onError: (error) => {
markStreamFailed(
error?.message || (typeof error === "string" ? error : "Failed to get response"),
);
},
};
try {
abortControllerRef.current = await service.streamMessage(
threadId,
finalText,
streamCallbacks,
imagePayload,
clientMessageId,
);
} catch (error: any) {
// Opening the stream itself failed (token fetch, transport). Without
// this the composer stays locked behind isStreaming forever.
markStreamFailed(error?.message || "Failed to get response");
}
return true;
},
[isStreaming, threadId, service],
);
const onReset = useCallback(async () => {
if (abortControllerRef.current) {
abortControllerRef.current.abort();
abortControllerRef.current = null;
}
setIsInitializing(true);
setInitError(null);
try {
const currentThreadId = threadId;
clearChat();
if (currentThreadId) {
await service.resetThread(currentThreadId).catch(() => {});
}
const res = await service.createThread(scope, screenContext);
setInitError(null);
setThreadId(res.thread.id);
if (res.message) {
const welcomeMsg: ChatMessage = {
_id: `welcome_${Date.now()}`,
text: res.message.text || "Thread reset.",
createdAt: new Date(),
user: BOT,
// No local greeting block: the welcome screen already greets the
// user by name in its heading, and a second one here both repeated
// it and shadowed the agent's own sentence about what it supports.
blocks: res.message.blocks || [],
};
setMessages([welcomeMsg]);
}
} catch (error: any) {
console.error("Failed to reset thread", error);
setInitError(
error?.message ||
"Failed to reset conversation. Please check your connection and try again.",
);
} finally {
setIsInitializing(false);
}
}, [threadId, clearChat, service, scope, screenContext]);
const handleCancel = useCallback(() => {
if (abortControllerRef.current) {
abortControllerRef.current.abort();
abortControllerRef.current = null;
setIsStreaming(false);
setMessages((prev) =>
prev.map((m) => {
const isBot = m.user._id === BOT._id;
const isStreamingOrEmpty =
m.text === "" || (m.blocks && m.blocks.length === 1 && m.blocks[0].isStreaming);
if (isBot && isStreamingOrEmpty) {
return {
...m,
text: "",
blocks: [
{
type: "status",
title: "You stopped this response",
status: "cancel_stream",
},
],
};
}
return {
...m,
blocks: m.blocks?.map((b) => ({ ...b, isStreaming: false })),
};
}),
);
}
}, []);
const handleAction = useCallback(
async (msgId: string, actionId: string, type: "confirm" | "cancel") => {
if (!threadId || processingActionIds.includes(actionId)) return;
setProcessingActionIds((prev) => [...prev, actionId]);
try {
// Read off the ref, not `messages`: re-creating handleAction on every
// message would remount the confirmation buttons mid-submit.
const actionType = messagesRef.current.find((m) => m._id === msgId)?.pendingAction?.type;
const res =
type === "confirm"
? await service.confirmAction(threadId, actionId, actionType)
: await service.cancelAction(threadId, actionId);
setMessages((prev) =>
prev.map((m) => (m._id === msgId ? { ...m, pendingAction: null } : m)),
);
if (res.message) {
const resultMsg: ChatMessage = {
_id: `res_${Date.now()}`,
text: res.message.text || (type === "confirm" ? "Confirmed." : "Cancelled."),
createdAt: new Date(),
user: BOT,
blocks: res.message.blocks,
};
setMessages((prev) => [resultMsg, ...prev]);
}
} catch (error) {
console.error(`Failed to ${type} action`, error);
const errMsg: ChatMessage = {
_id: `err_${Date.now()}`,
text: "",
createdAt: new Date(),
user: BOT,
blocks: [
{
type: "status",
status: "error",
description:
"Sorry, something went wrong while processing your request. Please try again.",
},
],
};
setMessages((prev) => [
errMsg,
...prev.map((m) => (m._id === msgId ? { ...m, pendingAction: null } : m)),
]);
} finally {
setProcessingActionIds((prev) => prev.filter((id) => id !== actionId));
}
},
[threadId, processingActionIds, service],
);
const state = useMemo<ChatState>(
() => ({
messages,
threadId,
text,
isStreaming,
isInitializing,
initError,
processingActionIds,
selectedImage,
userName,
}),
[
messages,
threadId,
text,
isStreaming,
isInitializing,
initError,
processingActionIds,
selectedImage,
userName,
],
);
const actions = useMemo<ChatActions>(
() => ({
setText,
setSelectedImage,
onSend,
onReset,
handleCancel,
handleAction,
setMessages,
setThreadId,
clearChat,
initThread,
}),
[onSend, onReset, handleCancel, handleAction, clearChat, initThread],
);
const value = useMemo<ChatContextValue>(() => ({ state, actions }), [state, actions]);
return <ChatbotContext.Provider value={value}>{children}</ChatbotContext.Provider>;
};
export const ChatbotContextProvider = ({ children }: { children: ReactNode }) => {
const { meta } = useChatbotRuntime();
const userId = meta.userId ?? null;
return (
<ChatbotContextProviderForUser key={userId ?? "anonymous"} userId={userId}>
{children}
</ChatbotContextProviderForUser>
);
};
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