import { delimiter } from '../core/regex.js'
import { registerMethods } from '../../utils/methods.js'

// Return array of classes on the node
export function classes () {
  var attr = this.attr('class')
  return attr == null ? [] : attr.trim().split(delimiter)
}

// Return true if class exists on the node, false otherwise
export function hasClass (name) {
  return this.classes().indexOf(name) !== -1
}

// Add class to the node
export function addClass (name) {
  if (!this.hasClass(name)) {
    var array = this.classes()
    array.push(name)
    this.attr('class', array.join(' '))
  }

  return this
}

// Remove class from the node
export function removeClass (name) {
  if (this.hasClass(name)) {
    this.attr('class', this.classes().filter(function (c) {
      return c !== name
    }).join(' '))
  }

  return this
}

// Toggle the presence of a class on the node
export function toggleClass (name) {
  return this.hasClass(name) ? this.removeClass(name) : this.addClass(name)
}

registerMethods('Dom', {
  classes, hasClass, addClass, removeClass, toggleClass
})