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import { getElements } from "./selector.js"

// local variables

const nativeEvents = [`click`, `focus`, `blur`]

/*

------------------------------------------------------------------------------

Adds event listener to an element. Using namespaces is available.

@param {String|Element|NodeList|Array} elements Selector, single or multiple elements

@param {String} eventNames Space separated event names with optional namespaces

@param {Function} callback The function to execute when the event occurs

@param {Object} options [optional] Optional options

*/

const addEventListener = (elements, eventNames, callback, options = false) => {

elements = getElements(elements)

elements.forEach((element) => {

// eslint-disable-next-line no-prototype-builtins

if (!element.hasOwnProperty(`registeredEvents`)) {

element.registeredEvents = []

}

eventNames.split(` `).forEach((eventName) => {

const [eventNameType] = eventName.split(`.`)

const theCallback = (...args) => callback(...args, element)

element.registeredEvents.push({

eventName: eventName,

callback: theCallback,

options: options,

})

element.addEventListener(eventNameType, theCallback, options)

})

})

}

/*

------------------------------------------------------------------------------

Delegates event listener to an element. Using namespaces is available.

@param {String} elements Selector

@param {String} eventNames Space separated event names with optional namespaces

@param {Function} callback The function to execute when the event occurs

*/

const delegateEventListener = (selector, eventNames, callback) => {

addEventListener(document, eventNames, (e) => {

const element = e.target.closest(selector)

if (element) {

callback(e, element)

}

})

}

/*

------------------------------------------------------------------------------

Removes event listener from an element. Using namespaces is available.

@param {String|Element|NodeList|Array} elements Selector, single or multiple elements

@param {String} eventNames Space separated event names with optional namespaces

@param {Function} callback The function to execute when the event occurs

@param {Object} options [optional] Optional options

*/

const removeEventListener = (

elements,

eventName = false,

callback = false,

options = false

) => {

elements = getElements(elements)

elements.forEach((element) => {

// eslint-disable-next-line no-prototype-builtins

if (!element.hasOwnProperty(`registeredEvents`)) {

return

}

// remove all event listeners

if (!eventName && !callback && !options) {

element.registeredEvents.forEach((regEvent) => {

element.removeEventListener(

regEvent.eventName.split(`.`)[0],

regEvent.callback,

regEvent.options

)

})

element.registeredEvents = []

return

}

// remove specific and/or namespaced event listeners

const [eventNameType, eventNameSpace] = eventName.split(`.`)

element.registeredEvents.forEach((regEvent) => {

const [regEventNameType, regEventNameSpace] =

regEvent.eventName.split(`.`)

const regEventNameMatch =

regEvent.eventName === eventName ||

(!eventNameSpace &&

eventNameType &&

eventNameType === regEventNameType) ||

(!eventNameType &&

eventNameSpace &&

eventNameSpace === regEventNameSpace)

let doRemove = false

// only 'eventName' provided

if (eventName && !callback && !options) {

if (regEventNameMatch) {

doRemove = true

}

}

// only 'callback' provided

else if (!eventName && callback && !options) {

if (callback === regEvent.callback) {

doRemove = true

}

}

// only 'options' provided

else if (!eventName && !callback && options) {

if (options === regEvent.options) {

doRemove = true

}

}

// 'eventName' and 'callback' provided

else if (eventName && callback && !options) {

if (regEventNameMatch && callback === regEvent.callback) {

doRemove = true

}

}

// 'callback' and 'options' provided

else if (!eventName && callback && options) {

if (callback === regEvent.callback && options === regEvent.options) {

doRemove = true

}

}

// everything's provided

else {

if (

regEventNameMatch &&

callback === regEvent.callback &&

options === regEvent.options

) {

doRemove = true

}

}

if (doRemove) {

element.removeEventListener(

regEventNameType,

regEvent.callback,

regEvent.options

)

element.registeredEvents = element.registeredEvents.filter(

(e) => e !== regEvent

)

}

})

})

}

/*

------------------------------------------------------------------------------

Triggers event on an element. Using namespaces is available.

@param {String|Element|NodeList|Array} elements Selector, single or multiple elements

@param {String} eventNames Space separated event names with optional namespaces

@param {Mixed} data The data to pass. Not available for `nativeEvents` events

*/

const triggerEvent = (elements, eventNames, data = null) => {

elements = getElements(elements)

elements.forEach((element) => {

eventNames.split(` `).forEach((eventName) => {

const [eventNameType, eventNameSpace] = eventName.split(`.`)

let eventTriggered = false

// trigger registered event

// eslint-disable-next-line no-prototype-builtins

if (element.hasOwnProperty(`registeredEvents`)) {

const eventsTriggered = []

element.registeredEvents.forEach((registeredEvent) => {

const [regEventNameType, regEventNameSpace] =

registeredEvent.eventName.split(`.`)

// do not trigger the exact events more than once

if (eventsTriggered.includes(registeredEvent.eventName)) {

return

}

if (

// type (and namespace) trigger (e.g. 'click.goBaby')

eventName === registeredEvent.eventName ||

// type only trigger (e.g. 'click')

(!eventNameSpace && eventNameType === regEventNameType) ||

// namespace only trigger (e.g. '.goBaby')

(!eventNameType && eventNameSpace === regEventNameSpace)

) {

// trigger native event

if (nativeEvents.includes(regEventNameType)) {

element[regEventNameType]()

}

// trigger custom event

else {

const event = new CustomEvent(registeredEvent.eventName, {

detail: data,

})

element.dispatchEvent(event)

}

eventsTriggered.push(registeredEvent.eventName)

eventTriggered = true

}

})

}

// trigger non-registered event

if (!eventTriggered && eventNameType) {

// trigger native event

if (nativeEvents.includes(eventNameType)) {

element[eventNameType]()

}

// trigger custom event

else {

const event = new CustomEvent(eventNameType, {

detail: data,

})

element.dispatchEvent(event)

}

}

})

})

}

/*

------------------------------------------------------------------------------

*/

export {

addEventListener,

delegateEventListener,

removeEventListener,

triggerEvent,

}