import React from "react";

export type UseWebsocketHookParams = {
    debounce?: number;
    url: string;
};

let reconnectInterval: any;
let msgInterval: any;
let sendInterval: any;

let tries = 0;

export const WebSocketEventNames = ["wsDataEvent", "wsMessageEvent"] as const;

/**
 * # Use Websocket Hook
 * @event wsDataEvent Listen for event named `wsDataEvent` on `window` to receive Data events
 * @event wsMessageEvent Listen for event named `wsMessageEvent` on `window` to receive Message events
 *
 * @example window.addEventLiatener("wsDataEvent", (e)=>{
 *    console.log(e.detail.data) // type object
 * })
 * @example window.addEventLiatener("wsMessageEvent", (e)=>{
 *      console.log(e.detail.message) // type string
 * })
 */
export default function useWebSocket<T>({
    url,
    debounce,
}: UseWebsocketHookParams) {
    const DEBOUNCE = debounce || 200;

    const [socket, setSocket] = React.useState<WebSocket | undefined>(
        undefined
    );

    const messageQueueRef = React.useRef<string[]>([]);
    const sendMessageQueueRef = React.useRef<string[]>([]);

    // const [message, setMessage] = React.useState<string>("");
    // const [data, setData] = React.useState<T | null>(null);
    const [refresh, setRefresh] = React.useState(0);

    const dispatchCustomEvent = React.useCallback(
        (evtName: (typeof WebSocketEventNames)[number], value: string | T) => {
            const event = new CustomEvent(evtName, {
                detail: {
                    data: value,
                    message: value,
                },
            });
            window.dispatchEvent(event);
        },
        []
    );

    React.useEffect(() => {
        const wsURL = url;
        if (!wsURL) return;

        const ws = new WebSocket(wsURL);

        ws.onopen = (ev) => {
            window.clearInterval(reconnectInterval);
            setSocket(ws);
            tries = 0;
        };

        ws.onmessage = (ev) => {
            window.clearInterval(msgInterval);
            messageQueueRef.current.push(ev.data);
            msgInterval = setInterval(handleReceivedMessageQueue, DEBOUNCE);
        };

        ws.onclose = (ev) => {
            console.log("Websocket closed ... Attempting to reconnect ...");
            reconnectInterval = setInterval(() => {
                if (tries >= 3) {
                    return window.clearInterval(reconnectInterval);
                }
                console.log("Attempting to reconnect ...");
                setRefresh(refresh + 1);
                tries++;
            }, 1000);
        };

        return function () {
            window.clearInterval(reconnectInterval);
        };
    }, [refresh]);

    /**
     * Received Message Queue Handler
     */
    const handleReceivedMessageQueue = React.useCallback(() => {
        if (messageQueueRef.current.length > 0) {
            const newMessage = messageQueueRef.current.shift();
            if (!newMessage) return;
            try {
                const jsonData = JSON.parse(newMessage);
                // setData(jsonData);

                dispatchCustomEvent("wsMessageEvent", newMessage);
                dispatchCustomEvent("wsDataEvent", jsonData);
            } catch (error) {
                console.log("Unable to parse string. Returning string.");
            }
        } else {
            window.clearInterval(msgInterval);
        }
    }, []);

    /**
     * Send Message Queue Handler
     */
    const handleSendMessageQueue = React.useCallback(() => {
        if (sendMessageQueueRef.current.length > 0) {
            const newMessage = sendMessageQueueRef.current.shift();
            if (!newMessage) return;
            socket?.send(newMessage);
        } else {
            window.clearInterval(sendInterval);
        }
    }, [socket]);

    /**
     * # Send Data Function
     */
    const sendData = React.useCallback(
        (data: T) => {
            try {
                window.clearInterval(sendInterval);
                sendMessageQueueRef.current.push(JSON.stringify(data));
                sendInterval = setInterval(handleSendMessageQueue, DEBOUNCE);
            } catch (error: any) {
                console.log("Error Sending socket message", error.message);
            }
        },
        [socket]
    );

    return { socket, sendData };
}