

export default class MessageBag {
    constructor() {
        this.bag = {}
    }

    add(name, thing) {
        if (! this.bag[name]) {
            this.bag[name] = []
        }

        this.bag[name].push(thing)
    }

    push(name, thing) {
        this.add(name, thing)
    }

    first(name) {
        if (! this.bag[name]) return null

        return this.bag[name][0]
    }

    last(name) {
        return this.bag[name].slice(-1)[0]
    }

    get(name) {
        return this.bag[name]
    }

    shift(name) {
        return this.bag[name].shift()
    }

    call(name, ...params) {
        (this.listeners[name] || []).forEach(callback => {
            callback(...params)
        })
    }

    has(name) {
        return Object.keys(this.listeners).includes(name)
    }
}