/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const EventEmitter = require("devtools/shared/event-emitter");

loader.lazyRequireGetter(this, "StorageFront",
                         "devtools/shared/fronts/storage", true);
loader.lazyRequireGetter(this, "StorageUI",
                         "devtools/client/storage/ui", true);

class StoragePanel {
  constructor(panelWin, toolbox) {
    EventEmitter.decorate(this);

    this._toolbox = toolbox;
    this._target = toolbox.target;
    this._panelWin = panelWin;

    this.destroy = this.destroy.bind(this);
  }

  get target() {
    return this._toolbox.target;
  }

  get panelWindow() {
    return this._panelWin;
  }

  /**
   * open is effectively an asynchronous constructor
   */
  open() {
    let targetPromise;
    // We always interact with the target as if it were remote
    if (!this.target.isRemote) {
      targetPromise = this.target.makeRemote();
    } else {
      targetPromise = Promise.resolve(this.target);
    }

    return targetPromise.then(() => {
      this.target.on("close", this.destroy);
      this._front = new StorageFront(this.target.client, this.target.form);

      this.UI = new StorageUI(this._front, this._target,
                              this._panelWin, this._toolbox);
      this.isReady = true;
      this.emit("ready");

      return this;
    }).catch(e => {
      console.log("error while opening storage panel", e);
      this.destroy();
    });
  }

  /**
   * Destroy the storage inspector.
   */
  destroy() {
    if (!this._destroyed) {
      this.UI.destroy();
      this.UI = null;

      // Destroy front to ensure packet handler is removed from client
      this._front.destroy();
      this._front = null;
      this._destroyed = true;

      this._target.off("close", this.destroy);
      this._target = null;
      this._toolbox = null;
      this._panelWin = null;
    }

    return Promise.resolve(null);
  }
}

exports.StoragePanel = StoragePanel;