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createContext,
ReactNode,
useCallback,
useContext,
useMemo,
useRef,
useState,
} from 'react';
import { GiftedChat } from 'react-native-gifted-chat';
import { Keyboard } from 'react-native';
import { ChatMessage } from '@/types/chat';
import { chatbotService } from '@/services/chatbotService';
export const USER = { _id: 1 };
export const BOT = { _id: 2, name: 'Flash Bot' };
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() || '';
Iif (!base64Value) {
return null;
}
Iif (base64Value.startsWith('data:')) {
return base64Value;
}
// Reject URL-like values (http, https, blob, file, etc.). ChatBox only sends uploaded image data.
Iif (hasUrlScheme(base64Value)) {
return null;
}
return `data:${image.type || 'image/jpeg'};base64,${base64Value}`;
};
interface ChatContextType {
messages: ChatMessage[];
threadId: string | null;
text: string;
isStreaming: boolean;
isInitializing: boolean;
processingActionIds: string[];
selectedImage: { uri: string; fileName?: string; type?: string; base64?: string } | null;
setText: (text: string) => void;
setSelectedImage: (img: SelectedImage | null) => void;
onSend: (overrideText?: string) => Promise<void>;
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;
closeChat: () => void;
setCloseChat: (fn: () => void) => void;
initThread: () => Promise<void>;
fabOffset: number;
setFabOffset: (offset: number) => void;
}
const ChatContext = createContext<ChatContextType | undefined>(undefined);
export const ChatProvider = ({ children }: { children: ReactNode }) => {
const [messages, setMessages] = useState<ChatMessage[]>([]);
const [threadId, setThreadId] = useState<string | null>(null);
const [text, setText] = useState('');
const [isStreaming, setIsStreaming] = useState(false);
const [isInitializing, setIsInitializing] = useState(false);
const [processingActionIds, setProcessingActionIds] = useState<string[]>([]);
const [selectedImage, setSelectedImage] = useState<{
uri: string;
fileName?: string;
type?: string;
base64?: string;
} | null>(null);
const [fabOffset, setFabOffset] = useState(0);
const abortControllerRef = useRef<{ abort: () => void } | null>(null);
const closeChatRef = useRef<(() => void) | null>(null);
const initThread = useCallback(async () => {
if (threadId) return;
setIsInitializing(true);
try {
const res = await chatbotService.createThread();
setThreadId(res.thread.id);
if (res.message) {
const welcomeMsg: ChatMessage = {
_id: `welcome_${Date.now()}`,
text: res.message.text || 'Welcome!',
createdAt: new Date(),
user: BOT,
blocks: res.message.blocks,
};
setMessages([welcomeMsg]);
}
} catch (error) {
console.error('Failed to init thread', error);
} finally {
setIsInitializing(false);
}
}, [threadId]);
const clearChat = useCallback(() => {
setMessages([]);
setThreadId(null);
setText('');
setSelectedImage(null);
setIsStreaming(false);
setProcessingActionIds([]);
}, []);
const onSend = useCallback(
async (overrideText?: string) => {
const finalText = overrideText || text.trim();
Iif ((!finalText && !selectedImage) || isStreaming || !threadId) return;
Keyboard.dismiss();
setText('');
const currentImage = selectedImage;
setSelectedImage(null);
const userMsgs: ChatMessage[] = [];
const timestamp = Date.now();
Eif (finalText) {
userMsgs.push({
_id: `u_txt_${timestamp}`,
text: finalText,
createdAt: new Date(),
user: USER,
});
}
if (currentImage) {
userMsgs.push({
_id: `u_img_${timestamp}`,
text: '',
createdAt: new Date(),
user: USER,
image: currentImage.uri,
});
}
setMessages(prev => GiftedChat.append(prev, userMsgs));
setIsStreaming(true);
const botMsgId = `b_${Date.now()}`;
const botMsg: ChatMessage = {
_id: botMsgId,
text: '',
createdAt: new Date(),
user: BOT,
blocks: [{ type: 'text', text: '', isStreaming: true }],
};
setMessages(prev => GiftedChat.append(prev, [botMsg]));
const resolvedImageData = resolveImageData(currentImage);
const imagePayload = resolvedImageData
? [{ data: resolvedImageData, name: currentImage?.fileName, type: currentImage?.type }]
: undefined;
const controller = await chatbotService.streamMessage(
threadId,
finalText,
{
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: any) => ({ ...b, isStreaming: false })),
pendingAction: data.pendingAction,
}
: m,
),
);
},
onError: error => {
setIsStreaming(false);
abortControllerRef.current = null;
const errorMsg =
error?.message || (typeof error === 'string' ? error : 'Failed to get response');
setMessages(prev =>
prev.map(m =>
m._id === botMsgId
? {
...m,
blocks: [
...(m.blocks?.map(b => ({ ...b, isStreaming: false })) || []),
{ type: 'error', text: errorMsg },
],
}
: m,
),
);
},
},
imagePayload,
);
abortControllerRef.current = controller;
},
[text, selectedImage, isStreaming, threadId],
);
const onReset = useCallback(async () => {
Iif (!threadId) return;
Iif (abortControllerRef.current) {
abortControllerRef.current.abort();
abortControllerRef.current = null;
}
setIsInitializing(true);
try {
const currentThreadId = threadId;
clearChat();
await chatbotService.resetThread(currentThreadId);
const res = await chatbotService.createThread();
setThreadId(res.thread.id);
Eif (res.message) {
const welcomeMsg: ChatMessage = {
_id: `welcome_${Date.now()}`,
text: res.message.text || 'Thread reset.',
createdAt: new Date(),
user: BOT,
blocks: res.message.blocks,
};
setMessages([welcomeMsg]);
}
} catch (error) {
console.error('Failed to reset thread', error);
} finally {
setIsInitializing(false);
}
}, [threadId, clearChat]);
const handleCancel = useCallback(() => {
Eif (abortControllerRef.current) {
abortControllerRef.current.abort();
abortControllerRef.current = null;
setIsStreaming(false);
setMessages(prev =>
prev.map(m => {
const isBot = m.user._id === BOT._id;
const isStreamingOrEmpty =
m.text === '' || (m.blocks && m.blocks.length === 1 && m.blocks[0].isStreaming);
if (isBot && isStreamingOrEmpty) {
return {
...m,
text: '',
blocks: [
{
type: 'status',
title: 'You stopped this response',
status: 'cancel_stream',
},
],
};
}
return {
...m,
blocks: m.blocks?.map(b => ({ ...b, isStreaming: false })),
};
}),
);
}
}, []);
const handleAction = useCallback(
async (msgId: string, actionId: string, type: 'confirm' | 'cancel') => {
Iif (!threadId || processingActionIds.includes(actionId)) return;
setProcessingActionIds(prev => [...prev, actionId]);
try {
const res =
type === 'confirm'
? await chatbotService.confirmAction(threadId, actionId)
: await chatbotService.cancelAction(threadId, actionId);
setMessages(prev => prev.map(m => (m._id === msgId ? { ...m, pendingAction: null } : m)));
Eif (res.message) {
const resultMsg: ChatMessage = {
_id: `res_${Date.now()}`,
text: res.message.text || (type === 'confirm' ? 'Confirmed.' : 'Cancelled.'),
createdAt: new Date(),
user: BOT,
blocks: res.message.blocks,
};
setMessages(prev => GiftedChat.append(prev, [resultMsg]));
}
} catch (error) {
console.error(`Failed to ${type} action`, error);
} finally {
setProcessingActionIds(prev => prev.filter(id => id !== actionId));
}
},
[threadId, processingActionIds],
);
const closeChat = useCallback(() => {
closeChatRef.current?.();
}, []);
const setCloseChat = useCallback((fn: () => void) => {
closeChatRef.current = fn;
}, []);
const value = useMemo(
() => ({
messages,
threadId,
text,
isStreaming,
isInitializing,
processingActionIds,
selectedImage,
setText,
setSelectedImage,
onSend,
onReset,
handleCancel,
handleAction,
setMessages,
setThreadId,
clearChat,
closeChat,
setCloseChat,
initThread,
fabOffset,
setFabOffset,
}),
[
messages,
threadId,
text,
isStreaming,
isInitializing,
processingActionIds,
selectedImage,
onSend,
onReset,
handleCancel,
handleAction,
clearChat,
closeChat,
setCloseChat,
initThread,
fabOffset,
],
);
return <ChatContext.Provider value={value}>{children}</ChatContext.Provider>;
};
export const useChat = () => {
const context = useContext(ChatContext);
if (context === undefined) {
throw new Error('useChat must be used within a ChatProvider');
}
return context;
};
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