'use client';

import { createContext, useContext, useEffect, useState, useRef } from 'react';
import * as signalR from '@microsoft/signalr';
import { fetchApi, throwError } from '@/lib/utils/client';

const SignalRContext = createContext<{
    cryptoConnection: signalR.HubConnection | null;
    chatConnection: signalR.HubConnection | null;
	cryptoConnected: boolean;
	chatConnected: boolean;
	stopConnections: () => Promise<void>;
	reconnectChat: (accessToken?: string | null) => Promise<void>;
}>({
    cryptoConnection: null,
    chatConnection: null,
	cryptoConnected: false,
	chatConnected: false,
	stopConnections: async () => {},
	reconnectChat: async () => {}
});

type Props = {
	children: React.ReactNode;
	accessToken: string|null;
	signalRCryptoUrl: string;
	signalRChatUrl: string;
}

export function SignalRProvider({ children, accessToken, signalRCryptoUrl, signalRChatUrl }: Props) {
	const cryptoConnectionRef = useRef<signalR.HubConnection|null>(null);
	const chatConnectionRef = useRef<signalR.HubConnection|null>(null);
	const [chatConnection, setChatConnection] = useState<signalR.HubConnection|null>(null);
	const [cryptoConnected, setCryptoConnected] = useState<boolean>(false);
	const [chatConnected, setChatConnected] = useState<boolean>(false);

	// 초기 렌더 시에만 전달됨. 토큰 갱신 시에는 reconnectChat()을 통해 수동으로 재연결 처리
	useEffect(() => {
		initCryptoConnection();
		initChatConnection(accessToken);

		return () => {
			stopConnections();
		};
	}, []);

	useEffect(() => {
		if (cryptoConnected) {
			console.info('SignalR Crypto Connected');
		}
	}, [cryptoConnected]);

	useEffect(() => {
		if (chatConnected) {
			console.info('SignalR Chat Connected');
		}
	}, [chatConnected]);

	const initCryptoConnection = async () => {
		try {
			if (cryptoConnectionRef.current && cryptoConnectionRef.current.state !== signalR.HubConnectionState.Disconnected) {
				return;
			}

			const conn = new signalR.HubConnectionBuilder().withUrl(signalRCryptoUrl).withAutomaticReconnect().build();
			await conn.start();

			setCryptoConnected(true);
			cryptoConnectionRef.current = conn;
		} catch (error) {
			console.error('SignalR Crypto Connect Failed:', error);
		}
	};

	const initChatConnection = async (accessToken?: string|null) => {
		try {
			if (chatConnectionRef.current && chatConnectionRef.current.state !== signalR.HubConnectionState.Disconnected) {
				await chatConnectionRef.current.stop();
			}

			const connectionOptions = accessToken ? { accessTokenFactory: async () => accessToken, withCredentials: true } : {};
			const conn = new signalR.HubConnectionBuilder().withUrl(signalRChatUrl, connectionOptions).withAutomaticReconnect().build();
			await conn.start();

			conn.on('Connected', (message) => {
				console.info(message);
			});

			conn.on('Logout', (message) => {
				console.info(message);
			});

			conn.on('Kick', async () => {
				fetchApi('/api/auth/logout', {
					method: 'POST'
				}).then((res) => {
					throwError(res);
					alert('관리자에 의해 강제 종료되었습니다.');

					localStorage.setItem('rememberMe', "false");
					localStorage.removeItem('member');
					location.replace('/');
				});
			});

			chatConnectionRef.current = conn;
			setChatConnection(conn);
			setChatConnected(true);
		} catch (error) {
			console.error('SignalR Chat Connect Failed:', error);
		}
	};

	const stopConnections = async () => {
		if (chatConnectionRef.current && chatConnectionRef.current.state === signalR.HubConnectionState.Connected) {
			try {
				await chatConnectionRef.current.invoke('Logout');
				setChatConnected(false);
			} catch (error) {
				console.error('SignalR Chat Disconnect Failed:', error);
			}
		}
		if (cryptoConnectionRef.current && cryptoConnectionRef.current.state === signalR.HubConnectionState.Connected) {
			try {
				await cryptoConnectionRef.current.stop();
				setCryptoConnected(false);
			} catch (error) {
				console.error('SignalR Crypto Disconnect Failed:', error);
			}
		}
	};

	const reconnectChat = async (token?: string | null) => {
		await initChatConnection(token);
	};

	return (
		<SignalRContext.Provider value={{
			cryptoConnection: cryptoConnectionRef.current,
			chatConnection,
			cryptoConnected,
			chatConnected,
			stopConnections,
			reconnectChat
		}}>
			{children}
		</SignalRContext.Provider>
	)
}

export function useSignalRContext() {
    return useContext(SignalRContext);
}