// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
#define CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_

#include "base/memory/scoped_ptr.h"
#include "chrome/browser/sync/glue/synced_window_delegate.h"
#include "chrome/browser/ui/toolbar/toolbar_model.h"
#include "chrome/browser/ui/toolbar/toolbar_model_delegate.h"
#include "components/sessions/session_id.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"

namespace browser_sync {
class SyncedWindowDelegate;
class SyncedWindowDelegateAndroid;
}

namespace content {
class WebContents;
}

class Profile;
class TabAndroid;

// Abstract representation of a Tab Model for Android.  Since Android does
// not use Browser/BrowserList, this is required to allow Chrome to interact
// with Android's Tabs and Tab Model.
class TabModel : public content::NotificationObserver {
 public:
  virtual Profile* GetProfile() const;
  virtual bool IsOffTheRecord() const;
  virtual browser_sync::SyncedWindowDelegate* GetSyncedWindowDelegate() const;
  virtual SessionID::id_type GetSessionId() const;

  virtual int GetTabCount() const = 0;
  virtual int GetActiveIndex() const = 0;
  virtual content::WebContents* GetActiveWebContents() const;
  virtual content::WebContents* GetWebContentsAt(int index) const = 0;
  // This will return NULL if the tab has not yet been initialized.
  virtual TabAndroid* GetTabAt(int index) const = 0;

  virtual void SetActiveIndex(int index) = 0;
  virtual void CloseTabAt(int index) = 0;

  // Used for restoring tabs from synced foreign sessions.
  virtual void CreateTab(content::WebContents* web_contents,
                         int parent_tab_id) = 0;

  // Used by Developer Tools to create a new tab with a given URL.
  // Replaces CreateTabForTesting.
  virtual content::WebContents* CreateNewTabForDevTools(const GURL& url) = 0;

  // Return true if we are currently restoring sessions asynchronously.
  virtual bool IsSessionRestoreInProgress() const = 0;

 protected:
  explicit TabModel(Profile* profile);
  ~TabModel() override;

  // Instructs the TabModel to broadcast a notification that all tabs are now
  // loaded from storage.
  void BroadcastSessionRestoreComplete();

  ToolbarModel* GetToolbarModel();

 private:
  // Determines how TabModel will interact with the profile.
  void Observe(int type,
               const content::NotificationSource& source,
               const content::NotificationDetails& details) override;

  // The profile associated with this TabModel.
  Profile* profile_;

  // Describes if this TabModel contains an off-the-record profile.
  bool is_off_the_record_;

  // The SyncedWindowDelegate associated with this TabModel.
  scoped_ptr<browser_sync::SyncedWindowDelegateAndroid> synced_window_delegate_;

  // Unique identifier of this TabModel for session restore. This id is only
  // unique within the current session, and is not guaranteed to be unique
  // across sessions.
  SessionID session_id_;

  // The Registrar used to register TabModel for notifications.
  content::NotificationRegistrar registrar_;

  DISALLOW_COPY_AND_ASSIGN(TabModel);
};

#endif  // CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_