#pragma once

#include "envoy/stats/tag.h"

#include "source/common/stats/symbol_table.h"

namespace Envoy {

namespace Stats {

namespace TagUtility {

/**

 * Combines a stat name with an optional set of tag to create the final stat name to use. The

 * resulting StatNames will be valid through the lifetime of this object and all provided stat

 * names.

 */

class TagStatNameJoiner {

public:

  /**

   * Combines a prefix, stat name and tags into a single stat name.

   * @param prefix StaName the stat prefix to use.

   * @param name StaName the stat name to use.

   * @param stat_name_tags optionally StatNameTagVector the stat name tags to add to the stat name.

   */

  TagStatNameJoiner(StatName prefix, StatName stat_name,

                    StatNameTagVectorOptConstRef stat_name_tags, SymbolTable& symbol_table);

  /**

   * @return StatName the full stat name, including the tag suffix.

   */

  /**

   * @return StatName the stat name without the tags appended.

   */

private:

  // TODO(snowp): This isn't really "tag extracted", but we'll use this for the sake of consistency

  // until we can change the naming convention throughout.

  StatName tag_extracted_name_;

  SymbolTable::StoragePtr prefix_storage_;

  SymbolTable::StoragePtr full_name_storage_;

  StatName name_with_tags_;

  SymbolTable::StoragePtr joinNameAndTags(StatName name, const StatNameTagVector& stat_name_tags,

                                          SymbolTable& symbol_table);

};

bool isTagNameValid(absl::string_view name);

bool isTagValueValid(absl::string_view value);

} // namespace TagUtility

} // namespace Stats

} // namespace Envoy