'use strict';

function SyncEventEmitter () {
    this.listeners = new Map();
}

SyncEventEmitter.prototype.on = function (ev, callback) {
    if (this.listeners.has(ev)) {
        this.listeners.remove(ev);
    }
    
    this.listeners.set(ev, callback);
    
    return this;
};

SyncEventEmitter.prototype.emit = function (ev) {
    if (this.listeners.has(ev)) {
        let params = [];
        
        for (var i = 1 ; i < arguments.length ; ++i) {
            params.push(arguments[i]);
        }

        return this.listeners.get(ev).apply(undefined, params);
    }
};

SyncEventEmitter.prototype.removeListener = function (ev) {
    if (this.listeners.has(ev)) {
        this.listeners.remove(ev);
    }
};

SyncEventEmitter.prototype.hasListener = function (ev) {
    return this.listeners.has(ev);
};

module.exports = SyncEventEmitter;