// Copyright 2014 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_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_
#define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_

#include <set>
#include <utility>
#include <vector>

#include "base/callback_forward.h"
#include "base/task/cancelable_task_tracker.h"
#include "components/bookmarks/browser/bookmark_storage.h"
#include "components/favicon_base/favicon_callback.h"
#include "components/favicon_base/favicon_types.h"
#include "components/keyed_service/core/keyed_service.h"

class BookmarkNode;
class BookmarkPermanentNode;
class GURL;

namespace base {
struct UserMetricsAction;
}

namespace bookmarks {

// This class abstracts operations that depends on the embedder's environment,
// e.g. Chrome.
class BookmarkClient : public KeyedService {
 public:
  // Types representing a set of BookmarkNode and a mapping from BookmarkNode
  // to the number of time the corresponding URL has been typed by the user in
  // the Omnibox.
  typedef std::set<const BookmarkNode*> NodeSet;
  typedef std::pair<const BookmarkNode*, int> NodeTypedCountPair;
  typedef std::vector<NodeTypedCountPair> NodeTypedCountPairs;

  // Returns true if the embedder favors touch icons over favicons.
  virtual bool PreferTouchIcon();

  // Requests a favicon from the history cache for the web page at |page_url|.
  // |callback| is run when the favicon has been fetched. If |type| is:
  // - favicon_base::FAVICON, the returned gfx::Image is a multi-resolution
  //   image of gfx::kFaviconSize DIP width and height. The data from the
  //   history cache is resized if need be.
  // - not favicon_base::FAVICON, the returned gfx::Image is a single-resolution
  //   image with the largest bitmap in the history cache for |page_url| and
  //   |type|.
  virtual base::CancelableTaskTracker::TaskId GetFaviconImageForPageURL(
      const GURL& page_url,
      favicon_base::IconType type,
      const favicon_base::FaviconImageCallback& callback,
      base::CancelableTaskTracker* tracker);

    // Returns true if the embedder supports typed count for URL.
  virtual bool SupportsTypedCountForNodes();

  // Retrieves the number of time each BookmarkNode URL has been typed in
  // the Omnibox by the user.
  virtual void GetTypedCountForNodes(
      const NodeSet& nodes,
      NodeTypedCountPairs* node_typed_count_pairs);

  // Returns whether the embedder wants permanent node |node|
  // to always be visible or to only show them when not empty.
  virtual bool IsPermanentNodeVisible(const BookmarkPermanentNode* node) = 0;

  // Wrapper around RecordAction defined in base/metrics/user_metrics.h
  // that ensure that the action is posted from the correct thread.
  virtual void RecordAction(const base::UserMetricsAction& action) = 0;

  // Returns a task that will be used to load any additional root nodes. This
  // task will be invoked in the Profile's IO task runner.
  virtual bookmarks::LoadExtraCallback GetLoadExtraNodesCallback() = 0;

  // Returns true if the |permanent_node| can have its title updated.
  virtual bool CanSetPermanentNodeTitle(const BookmarkNode* permanent_node) = 0;

  // Returns true if |node| should sync.
  virtual bool CanSyncNode(const BookmarkNode* node) = 0;

  // Returns true if this node can be edited by the user.
  // TODO(joaodasilva): the model should check this more aggressively, and
  // should give the client a means to temporarily disable those checks.
  // http://crbug.com/49598
  virtual bool CanBeEditedByUser(const BookmarkNode* node) = 0;

 protected:
  virtual ~BookmarkClient() {}
};

}  // namespace bookmarks

#endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_