const Gi       = imports._gi
const Clutter  = imports.gi.Clutter
const Main     = imports.ui.main
const Me       = imports.misc.extensionUtils.getCurrentExtension()
const Override = Me.imports.overrides.helper
const VERSION  = Me.imports.overrides.helper.VERSION
const CLASSIC  = global.session_mode == 'classic'

var ExtendLeftBox = class ExtendLeftBox extends Override.Injection {
  get active() {
    return VERSION < 38
  }

  _init() {
    this._replace('_injectAllocate')
    this._replace('_allocate')
  }

  _injectAllocate() {
    Main.panel.__proto__[Gi.hook_up_vfunc_symbol]('allocate', (box, flags) => {
      Main.panel.vfunc_allocate.call(Main.panel, box, flags)
      this._allocate(Main.panel, box, flags)
    })
  }

  _allocate(actor, box, flags) {
    let leftBox   = Main.panel._leftBox
    let centerBox = Main.panel._centerBox
    let rightBox  = Main.panel._rightBox

    let allocWidth  = box.x2 - box.x1
    let allocHeight = box.y2 - box.y1

    let [leftMinWidth, leftNaturalWidth]     = leftBox.get_preferred_width(-1)
    let [centerMinWidth, centerNaturalWidth] = centerBox.get_preferred_width(-1)
    let [rightMinWidth, rightNaturalWidth]   = rightBox.get_preferred_width(-1)

    let sideWidth = allocWidth - rightNaturalWidth - centerNaturalWidth
    let childBox  = new Clutter.ActorBox()

    childBox.y1 = 0
    childBox.y2 = allocHeight

    if (actor.get_text_direction() == Clutter.TextDirection.RTL) {
      childBox.x1 = allocWidth - Math.min(Math.floor(sideWidth), leftNaturalWidth)
      childBox.x2 = allocWidth
    } else {
      childBox.x1 = 0
      childBox.x2 = Math.min(Math.floor(sideWidth), leftNaturalWidth)
    }

    leftBox.allocate(childBox, flags)

    childBox.y1 = 0
    childBox.y2 = allocHeight

    if (actor.get_text_direction() == Clutter.TextDirection.RTL) {
      childBox.x1 = rightNaturalWidth
      childBox.x2 = childBox.x1 + centerNaturalWidth
    } else {
      childBox.x1 = allocWidth - centerNaturalWidth - rightNaturalWidth
      childBox.x2 = childBox.x1 + centerNaturalWidth
    }

    centerBox.allocate(childBox, flags)

    childBox.y1 = 0
    childBox.y2 = allocHeight

    if (actor.get_text_direction() == Clutter.TextDirection.RTL) {
      childBox.x1 = 0
      childBox.x2 = rightNaturalWidth
    } else {
      childBox.x1 = allocWidth - rightNaturalWidth
      childBox.x2 = allocWidth
    }

    rightBox.allocate(childBox, flags)
  }
}

var ActivitiesButtonClassic = class ActivitiesButtonClassic extends Override.Injection {
  get active() {
    return CLASSIC == true
  }

  _init() {
    this._replace('activate', () => {})
    this._replace('destroy', () => {})
  }
}