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// Copyright 2013 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 COMPONENTS_SYNC_DRIVER_OPEN_TABS_UI_DELEGATE_H_
#define COMPONENTS_SYNC_DRIVER_OPEN_TABS_UI_DELEGATE_H_

#include <string>
#include <vector>

#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_memory.h"
#include "components/sessions/session_id.h"
#include "components/sessions/session_types.h"
#include "components/sync_driver/glue/synced_session.h"

namespace sync_driver {

class OpenTabsUIDelegate {
 public:
  // If a valid favicon for the page at |url| is found, fills |favicon_png| with
  // the png-encoded image and returns true. Else, returns false.
  virtual bool GetSyncedFaviconForPageURL(
      const std::string& pageurl,
      scoped_refptr<base::RefCountedMemory>* favicon_png) const = 0;

  // Builds a list of all foreign sessions, ordered from most recent to least
  // recent. Caller does NOT own SyncedSession objects.
  // Returns true if foreign sessions were found, false otherwise.
  virtual bool GetAllForeignSessions(
      std::vector<const SyncedSession*>* sessions) = 0;

  // Looks up the foreign tab identified by |tab_id| and belonging to foreign
  // session |tag|. Caller does NOT own the SessionTab object.
  // Returns true if the foreign session and tab were found, false otherwise.
  virtual bool GetForeignTab(const std::string& tag,
                             const SessionID::id_type tab_id,
                             const sessions::SessionTab** tab) = 0;

  // Delete a foreign session and all its sync data.
  virtual void DeleteForeignSession(const std::string& tag) = 0;

  // Loads all windows for foreign session with session tag |tag|. Caller does
  // NOT own SessionWindow objects.
  // Returns true if the foreign session was found, false otherwise.
  virtual bool GetForeignSession(
      const std::string& tag,
      std::vector<const sessions::SessionWindow*>* windows) = 0;

  // Loads all tabs for a foreign session, ignoring window grouping, and
  // ordering by recency (most recent to least recent). Will automatically
  // prune those tabs that are not syncable or are the NTP. Caller does NOT own
  // SessionTab objects.
  // Returns true if the foreign session was found, false otherwise.
  virtual bool GetForeignSessionTabs(
      const std::string& tag,
      std::vector<const sessions::SessionTab*>* tabs) = 0;

  // Sets |*local| to point to the sessions sync representation of the
  // local machine.
  virtual bool GetLocalSession(const SyncedSession** local) = 0;

 protected:
  virtual ~OpenTabsUIDelegate();
};

}  // namespace sync_driver

#endif  // COMPONENTS_SYNC_DRIVER_OPEN_TABS_UI_DELEGATE_H_