const getUserByToken = require("./util/getUserByToken.js");

module.exports = class {
    constructor() {
        this.avaliableStreams = {};
        this.avaliableStreamKeys = [];
    }

    addStream(streamName = "", removeIfEmpty = false, spectatorHostId = null) {
        // Make sure a stream with the same name doesn't exist already
        if (this.avaliableStreamKeys.includes(streamName))
            return global.consoleHelper.printBancho(`Did not add stream [${streamName}] A stream with the same name already exists`);
        // Add new stream to the list of streams
        this.avaliableStreams[streamName] = {
            streamUsers: [], // An array containing a list of user tokens of the users in a given stream
            streamSpectatorHost: spectatorHostId, // null unless stream is for spectating
            removeIfEmpty: removeIfEmpty
        }
        this.avaliableStreamKeys = Object.keys(this.avaliableStreams);
        global.consoleHelper.printBancho(`Added stream [${streamName}]`);
    }

    // Checks if a stream has no users in it
    streamChecker(interval = 5000) {
        setInterval(() => {
            // Get the names of all currently avaliable streams
            const streams = global.StreamsHandler.getStreams();
            // Loop through all streams
            for (let i = 0; i < streams.length; i++) {
                // Get the current stream
                const currentStream = global.StreamsHandler.avaliableStreams[streams[i]];
                // Check if the stream should be removed if there are no users in it
                // And if the stream has no users in it
                if (currentStream.removeIfEmpty && currentStream.streamUsers.length == 0) {
                    global.StreamsHandler.removeStream(streams[i]);
                    global.consoleHelper.printBancho(`Removed stream [${streams[i]}] There were no users in stream`);
                }
            }
        }, interval);
        global.consoleHelper.printBancho(`BinatoStream is running! Checks running at a ${interval}ms interval`);
    }

    sendToStream(streamName, streamData, initUser = null) {
        // Make sure the stream we are attempting to send to even exists
        if (!this.doesStreamExist(streamName))
            return global.consoleHelper.printBancho(`Did not send to stream [${streamName}] because it does not exist!`);

        // Get the stream to send the data to
        const currentStream = this.avaliableStreams[streamName];

        // Loop through the users in this stream
        for (let i = 0; i < currentStream.streamUsers.length; i++) {
            // Get the user token of the user in the queue
            const currentUserToken = currentStream.streamUsers[i];
            // Make sure we don't send this data back to the user requesting this data to be sent
            if (initUser != null && currentUserToken == initUser && (streamName[0] == "#" || streamName.includes("mp_"))) continue;
            if (currentUserToken == 3) continue; // Skip if user is bot

            // Get user object
            const currentUser = getUserByToken(currentUserToken);
            // Skip if user is nonexistant
            if (currentUser == null) continue;

            // Send stream data to user's own queue
            currentUser.addActionToQueue(streamData);
        }
    }

    addUserToStream(streamName, userToken) {
        // Make sure the stream we are attempting to add this user to even exists
        if (!this.doesStreamExist(streamName))
            return global.consoleHelper.printBancho(`Did not add user to stream [${streamName}] because it does not exist!`);

        // Make sure the user isn't already in the stream
        if (this.avaliableStreams[streamName].streamUsers.includes(userToken))
            return global.consoleHelper.printBancho(`Did not add user to stream [${streamName}] because they are already in it!`);

        // Make sure this isn't an invalid user (userId can't be lower than 1)
        if (userToken == "" || userToken == null)
            return global.consoleHelper.printBancho(`Did not add user to stream [${streamName}] because their token is invalid!`);

        // Add user's token to the stream's user list
        this.avaliableStreams[streamName].streamUsers.push(userToken);
        global.consoleHelper.printBancho(`Added user [${userToken}] to stream ${streamName}`);
    }

    removeUserFromStream(streamName, userToken) {
        // Make sure the stream we are attempting to add this user to even exists
        if (!this.doesStreamExist(streamName))
            return global.consoleHelper.printBancho(`Did not remove user from stream [${streamName}] because it does not exist!`);

        // Make sure the user isn't already in the stream
        if (!this.avaliableStreams[streamName].streamUsers.includes(userToken))
            return global.consoleHelper.printBancho(`Did not remove user from stream [${streamName}] because they are not in it!`);

        // Make sure this isn't an invalid user (userId can't be lower than 1)
        if (userToken == "" || userToken == null)
            return global.consoleHelper.printBancho(`Did not remove user from stream [${streamName}] because their userId is invalid!`);
        try {
            // Find index of user to remove
            let userCurrentIndex;
            for (let i = 0; i < this.avaliableStreams[streamName].streamUsers.length; i++) {
                if (userToken == this.avaliableStreams[streamName].streamUsers[i]) {
                    userCurrentIndex = i;
                    break;
                }
            }

            // Remove user from stream's user list
            this.avaliableStreams[streamName].streamUsers.splice(userCurrentIndex, 1);
            global.consoleHelper.printBancho(`Removed user [${userToken}] from stream ${streamName}`);
        } catch (e) { global.consoleHelper.printBancho(`Can't Remove user [${userToken}] from stream ${streamName}`); }
    }

    doesStreamExist(streamName) {
        return this.avaliableStreamKeys.includes(streamName);
    }

    getStreams() {
        // Return the names of all avaliable streams
        return this.avaliableStreamKeys;
    }

    isUserInStream(streamName, userToken) {
        if (this.avaliableStreams[streamName].streamUsers.includes(userToken)) return true;
        else return false;
    }

    removeStream(streamName) {
        try {
            delete this.avaliableStreams[streamName];
            this.avaliableStreamKeys = Object.keys(this.avaliableStreams);
        } catch (e) { global.consoleHelper.printError(`Was not able to remove stream [${streamName}]`) }
    }
}