/* eslint-disable */
const _events = new WeakMap()

export default class EventTarget {
    constructor() {
        _events.set(this, {})
    }

    addEventListener(type, listener, options = {}) {
        let events = _events.get(this)

        if (!events) {
            events = {}
            _events.set(this, events)
        }
        if (!events[type]) {
            events[type] = []
        }
        events[type].push(listener)

        if (options.capture) {
            // console.warn('EventTarget.addEventListener: options.capture is not implemented.')
        }
        if (options.once) {
            // console.warn('EventTarget.addEventListener: options.once is not implemented.')
        }
        if (options.passive) {
            // console.warn('EventTarget.addEventListener: options.passive is not implemented.')
        }
    }

    removeEventListener(type, listener, options = {}) {
        const events = _events.get(this)

        if (events) {
            const listeners = events[type]

            if (listeners && listeners.length > 0) {
                for (let i = listeners.length; i--; i > 0) {
                    if (listeners[i] === listener) {
                        listeners.splice(i, 1)
                        break
                    }
                }
            }
        }
    }

    dispatchEvent(event = {}) {
        const listeners = _events.get(this)[event.type]

        if (listeners) {
            for (let i = 0; i < listeners.length; i++) {
                listeners[i](event)
            }
        }
    }
}