const EventEmitter = require('events');

class EventParser extends EventEmitter {

    constructor() {
        super();
        this.buffer = '';
    }

    parse(data) {
        if (data === undefined) {
            return;
        }
        this.buffer += data;
        const indexOfEnd = this.buffer.indexOf(constants.EVENT_DELIMITER);
        if (indexOfEnd === -1) {
            return;
        }
        const event = JSON.parse(this.buffer.substring(0, indexOfEnd));
        this.buffer = '';
        if (event.id === undefined) {
            return;
        }
        const eventId = event.id.toLowerCase();
        this.emit(eventId, event.data);
    }
}

module.exports = EventParser;