class WTVClientSessionData {

    /***********************************\
    |* Special Thanks to:              *|
    |*                         No one  *|
    |* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  *|
    |*   There is literally nothing    *|
    |*    special about this class     *|
    \***********************************/

    data_store = null;
    capabilities = null;

    constructor() {
        this.data_store = new Array();
    }

    hasCap(cap) {
        if (this.capabilities) {
            return this.capabilities[cap] || false;
        }
        return false;
    }

    getMaxUsernameLength() {
        if (parseInt(this.data_store['wtv-system-version'] < 4000)) {
            // older builds may crash with nicknames longer than 16 chars.
            // actual build where support started is yet unknown
            return 16;
        } else {
            // newer builds supported up to 32 chars, I think
            return 32;
        }
    }

    setIRCNick(nick) {
        // strip out unsupported chars
        nick = nick.replace(/[^a-zA-Z0-9\-\_\`\^]/g, "");

        // limit nick length based on build support
        nick = nick.substring(0, this.getMaxUsernameLength());

        // returns headers to send to client, while storing the new data in our session data.
        this.data_store['wtv-user-name'] = nick;
        this.data_store['wtv-irc-nick'] = nick;
        return "wtv-irc-nick: " + nick + "\nwtv-user-nick: " + nick;
    }

    isMiniBrowser() {
        if (this.data_store['wtv-need-upgrade'] || this.data_store['wtv-used-8675309']) return true;
        return false;
    }

    currentConnections() {
        if (this.data_store) {
            if (this.data_store.sockets) {
                return this.data_store.sockets.size;
            }
        }
        return 0;
    }

    get(key = null) {
        if (typeof (this.data_store) === 'undefined') return null;
        else if (key === null) return this.data_store;
        else if (this.data_store[key]) return this.data_store[key];
        else return null;
    }

    set(key, value) {
        if (key === null) throw ("ClientSessionData.set(): invalid key provided");
        if (typeof (this.data_store) === 'undefined') this.data_store = new Array();
        this.data_store[key] = value;
    }

    delete(key) {
        if (key === null) throw ("ClientSessionData.delete(): invalid key provided");
        delete this.data_store[key];
    }
}


module.exports = WTVClientSessionData;