/*
 * Dash-To-Panel extension for Gnome 3
 * Copyright 2016 Jason DeRose (jderose9) and Charles Gagnon (charlesg99)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

import Gio from 'gi://Gio'

import * as Main from 'resource:///org/gnome/shell/ui/main.js'
import { EventEmitter } from 'resource:///org/gnome/shell/misc/signals.js'
import {
  Extension,
  gettext as _,
} from 'resource:///org/gnome/shell/extensions/extension.js'

import * as PanelManager from './panelManager.js'
import * as AppIcons from './appIcons.js'

const UBUNTU_DOCK_UUID = 'ubuntu-dock@ubuntu.com'

let panelManager
let extensionChangedHandler
let startupCompleteHandler
let extensionSystem = Main.extensionManager

export let DTP_EXTENSION = null
export let SETTINGS = null
export let DESKTOPSETTINGS = null
export let TERMINALSETTINGS = null
export let PERSISTENTSTORAGE = null
export let EXTENSION_UUID = null
export let EXTENSION_PATH = null

export default class DashToPanelExtension extends Extension {
  constructor(metadata) {
    super(metadata)

    this._realHasOverview = Main.sessionMode.hasOverview

    //create an object that persists until gnome-shell is restarted, even if the extension is disabled
    PERSISTENTSTORAGE = {}
  }

  enable() {
    DTP_EXTENSION = this

    // The Ubuntu Dock extension might get enabled after this extension
    extensionChangedHandler = extensionSystem.connect(
      'extension-state-changed',
      (data, extension) => {
        if (extension.uuid === UBUNTU_DOCK_UUID && extension.state === 1) {
          _enable(this)
        }
      },
    )

    //create a global object that can emit signals and conveniently expose functionalities to other extensions
    global.dashToPanel = new EventEmitter()

    _enable(this)
  }

  disable(reset = false) {
    panelManager.disable()

    DTP_EXTENSION = null
    SETTINGS = null
    DESKTOPSETTINGS = null
    TERMINALSETTINGS = null
    panelManager = null

    if (!reset) {
      extensionSystem.disconnect(extensionChangedHandler)
      delete global.dashToPanel

      AppIcons.resetRecentlyClickedApp()
    }

    if (startupCompleteHandler) {
      Main.layoutManager.disconnect(startupCompleteHandler)
      startupCompleteHandler = null
    }

    Main.sessionMode.hasOverview = this._realHasOverview
  }
}

function _enable(extension) {
  let enabled = global.settings.get_strv('enabled-extensions')

  if (enabled?.indexOf(UBUNTU_DOCK_UUID) >= 0)
    extensionSystem.disableExtension(UBUNTU_DOCK_UUID)

  if (panelManager) return

  SETTINGS = extension.getSettings('org.gnome.shell.extensions.dash-to-panel')
  DESKTOPSETTINGS = new Gio.Settings({
    schema_id: 'org.gnome.desktop.interface',
  })
  TERMINALSETTINGS = new Gio.Settings({
    schema_id: 'org.gnome.desktop.default-applications.terminal',
  })
  EXTENSION_UUID = extension.uuid
  EXTENSION_PATH = extension.path

  Main.layoutManager.startInOverview = !SETTINGS.get_boolean(
    'hide-overview-on-startup',
  )

  if (
    SETTINGS.get_boolean('hide-overview-on-startup') &&
    Main.layoutManager._startingUp
  ) {
    Main.sessionMode.hasOverview = false
    startupCompleteHandler = Main.layoutManager.connect(
      'startup-complete',
      () => {
        Main.sessionMode.hasOverview = extension._realHasOverview
      },
    )
  }

  // show the donate icon every 120 days (10368000000 milliseconds)
  let donateIconUnixtime = SETTINGS.get_string('hide-donate-icon-unixtime')

  if (donateIconUnixtime && donateIconUnixtime < Date.now() - 10368000000)
    SETTINGS.set_string('hide-donate-icon-unixtime', '')

  panelManager = new PanelManager.PanelManager()

  panelManager.enable()
}