const constants = require("./constants");
const parser = require('./Parser');

class Socket {
    constructor({ initialState='CONNECTING', socket }) {
        this._state = initialState;
        this._socket = socket;
        this._accepted = false;
        this._fateDecided = false; // Wether the decision to accept or reject the socket was made

        this._socket.on('data', (e) => {
            if (this._state !== constants.states.OPEN) return;

            this._decodePayload(e.buffer);
        });
    }
}

Socket.prototype.sendText = function(text) {
    const frame = new parser.WebsocketFrame();
    frame.FIN = 1;
    frame.RSVx = 0;
    frame.Opcode = 0x01;

    frame.MASK = 0;
    const length = text.length;
    if (length > 125) {
        frame.PayloadLen = 126;
    } else if (length >= 65536) {
        frame.PayloadLen = 127;
    } else if (length <= 125) {
        frame.PayloadLen = length;
    }
    frame.PayloadLenEx = length;
    frame.PayloadData = Buffer.from(text);

    this._socket.write(frame.toBuffer());
};

Socket.prototype._decodePayload = function(payload) {
    console.log(parser.parseWebsocketFrame(new DataView(payload)));
};

Socket.prototype._setConnectionState = function(state) {
    this._state = state;
};

Socket.prototype._setAccepted = function(state) {
    if (this._fateDecided) throw new Error('Tried to decide fate (wether socket is accepted or not) more than 1 time');

    this._fateDecided = true;
    this._accepted = state;
};

module.exports = Socket;