// 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 COMPONENTS_OMNIBOX_BROWSER_BOOKMARK_PROVIDER_H_
#define COMPONENTS_OMNIBOX_BROWSER_BOOKMARK_PROVIDER_H_

#include <string>

#include "components/omnibox/browser/autocomplete_input.h"
#include "components/omnibox/browser/autocomplete_match.h"
#include "components/omnibox/browser/autocomplete_provider.h"
#include "components/query_parser/snippet.h"

class AutocompleteProviderClient;

namespace bookmarks {
class BookmarkModel;
struct BookmarkMatch;
}

// This class is an autocomplete provider which quickly (and synchronously)
// provides autocomplete suggestions based on the titles of bookmarks. Page
// titles, URLs, and typed and visit counts of the bookmarks are not currently
// taken into consideration as those factors will have been used by the
// HistoryQuickProvider (HQP) while identifying suggestions.
//
// TODO(mrossetti): Propose a way to coordinate with the HQP the taking of typed
// and visit counts and last visit dates, etc. into consideration while scoring.
class BookmarkProvider : public AutocompleteProvider {
 public:
  explicit BookmarkProvider(AutocompleteProviderClient* client);

  // When |minimal_changes| is true short circuit any additional searching and
  // leave the previous matches for this provider unchanged, otherwise perform
  // a complete search for |input| across all bookmark titles.
  void Start(const AutocompleteInput& input, bool minimal_changes) override;

  // Sets the BookmarkModel for unit tests.
  void set_bookmark_model_for_testing(
      bookmarks::BookmarkModel* bookmark_model) {
    bookmark_model_ = bookmark_model;
  }

 private:
  FRIEND_TEST_ALL_PREFIXES(BookmarkProviderTest, InlineAutocompletion);

  ~BookmarkProvider() override;

  // Performs the actual matching of |input| over the bookmarks and fills in
  // |matches_|.
  void DoAutocomplete(const AutocompleteInput& input);

  // Compose an AutocompleteMatch based on |match| that has 1) the URL of
  // |match|'s bookmark, and 2) the bookmark's title, not the URL's page
  // title, as the description.  |input| is used to compute the match's
  // inline_autocompletion.  |fixed_up_input_text| is used in that way as well;
  // it's passed separately so this function doesn't have to compute it.
  AutocompleteMatch BookmarkMatchToACMatch(
      const AutocompleteInput& input,
      const base::string16& fixed_up_input_text,
      const bookmarks::BookmarkMatch& match);

  // Converts |positions| into ACMatchClassifications and returns the
  // classifications. |text_length| is used to determine the need to add an
  // 'unhighlighted' classification span so the tail of the source string
  // properly highlighted.
  static ACMatchClassifications ClassificationsFromMatch(
      const query_parser::Snippet::MatchPositions& positions,
      size_t text_length,
      bool is_url);

  AutocompleteProviderClient* client_;
  bookmarks::BookmarkModel* bookmark_model_;

  // Languages used during the URL formatting.
  std::string languages_;

  DISALLOW_COPY_AND_ASSIGN(BookmarkProvider);
};

#endif  // COMPONENTS_OMNIBOX_BROWSER_BOOKMARK_PROVIDER_H_