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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_QUERY_TILES_INTERNAL_TRENDING_TILE_HANDLER_H_
#define COMPONENTS_QUERY_TILES_INTERNAL_TRENDING_TILE_HANDLER_H_
#include <map>
#include <string>
#include <vector>
#include "components/query_tiles/internal/tile_group.h"
#include "components/query_tiles/tile.h"
namespace query_tiles {
// Class for handling trending tiles. It checks whether a trending tile
// should be displayed, hidden or removed.
class TrendingTileHandler {
public:
// Map between tile ID and tile impression.
using ImpressionMap = std::map<std::string, int>;
TrendingTileHandler();
~TrendingTileHandler();
TrendingTileHandler(const TrendingTileHandler& other) = delete;
TrendingTileHandler& operator=(const TrendingTileHandler& other) = delete;
// Resets the impression for all tiles. Must call this before calling other
// methods. If tile group changes, this method need to be called again.
void Reset();
// Given a list of tiles, remove extra trending tiles and return a list
// of tiles for display.
std::vector<Tile> FilterExtraTrendingTiles(
const std::vector<std::unique_ptr<Tile>>& tiles);
// Called when a tile is clicked.
void OnTileClicked(const std::string& tile_id);
// Returns a list of trending tile Ids to remove.
std::vector<std::string> GetTrendingTilesToRemove();
private:
// Record the impression for a tile with the give id.
void RecordImpression(const std::string& tile_id);
// Map to track how many times each tile is requested.
// A tile's impression is cleared after click.
// TODO(qinmin): move this to |tile_stats_group_|.
ImpressionMap tile_impressions_;
};
} // namespace query_tiles
#endif // COMPONENTS_QUERY_TILES_INTERNAL_TRENDING_TILE_HANDLER_H_
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