import Binding from './Binding.js'
import simpleDiff from '../Util/simpleDiff.js'
import { getRelativePosition, fromRelativePosition } from '../Util/relativePosition.js'

function typeObserver () {
  this._mutualExclude(() => {
    const textarea = this.target
    const textType = this.type
    const relativeStart = getRelativePosition(textType, textarea.selectionStart)
    const relativeEnd = getRelativePosition(textType, textarea.selectionEnd)
    textarea.value = textType.toString()
    const start = fromRelativePosition(textType._y, relativeStart)
    const end = fromRelativePosition(textType._y, relativeEnd)
    textarea.setSelectionRange(start, end)
  })
}

function domObserver () {
  this._mutualExclude(() => {
    let diff = simpleDiff(this.type.toString(), this.target.value)
    this.type.delete(diff.pos, diff.remove)
    this.type.insert(diff.pos, diff.insert)
  })
}

export default class TextareaBinding extends Binding {
  constructor (textType, domTextarea) {
    // Binding handles textType as this.type and domTextarea as this.target
    super(textType, domTextarea)
    // set initial value
    domTextarea.value = textType.toString()
    // Observers are handled by this class
    this._typeObserver = typeObserver.bind(this)
    this._domObserver = domObserver.bind(this)
    textType.observe(this._typeObserver)
    domTextarea.addEventListener('input', this._domObserver)
  }
  destroy () {
    // Remove everything that is handled by this class
    this.type.unobserve(this._typeObserver)
    this.target.unobserve(this._domObserver)
    super.destroy()
  }
}