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#ifndef MOZC_DICTIONARY_SYSTEM_SYSTEM_DICTIONARY_BUILDER_H_
#define MOZC_DICTIONARY_SYSTEM_SYSTEM_DICTIONARY_BUILDER_H_

#include <deque>
#include <map>
#include <memory>
#include <ostream>
#include <string>
#include <vector>

#include "base/port.h"
#include "dictionary/system/words_info.h"

namespace mozc {
namespace storage {
namespace louds {
class BitVectorBasedArrayBuilder;
class LoudsTrieBuilder;
}  // namespace louds
}  // namespace storage

namespace dictionary {

class SystemDictionaryCodecInterface;
class DictionaryFileCodecInterface;
struct Token;

class SystemDictionaryBuilder {
 public:
  // Represents words info for a certain key(=reading).
  struct KeyInfo {
    KeyInfo() : id_in_key_trie(-1) {}
    // id of the key(=reading) string in key trie
    int id_in_key_trie;
    std::string key;
    std::vector<TokenInfo> tokens;
  };

  SystemDictionaryBuilder();
  SystemDictionaryBuilder(const SystemDictionaryCodecInterface *codec,
                          const DictionaryFileCodecInterface *file_codec);
  virtual ~SystemDictionaryBuilder();
  void BuildFromTokens(const std::vector<Token *> &tokens);

  void WriteToFile(const std::string &output_file) const;
  void WriteToStream(const std::string &intermediate_output_file_base_path,
                     std::ostream *output_stream) const;

 private:
  typedef std::deque<KeyInfo> KeyInfoList;

  void ReadTokens(const std::vector<Token *> &tokens,
                  KeyInfoList *key_info_list) const;

  void BuildFrequentPos(const KeyInfoList &key_info_list);

  void BuildValueTrie(const KeyInfoList &key_info_list);

  void BuildKeyTrie(const KeyInfoList &key_info_list);

  void BuildTokenArray(const KeyInfoList &key_info_list);

  void SetIdForValue(KeyInfoList *key_info_list) const;
  void SetIdForKey(KeyInfoList *key_info_list) const;
  void SortTokenInfo(KeyInfoList *key_info_list) const;

  void SetCostType(KeyInfoList *key_info_list) const;
  void SetPosType(KeyInfoList *keyinfomap) const;
  void SetValueType(KeyInfoList *key_info_list) const;

  std::unique_ptr<mozc::storage::louds::LoudsTrieBuilder> value_trie_builder_;
  std::unique_ptr<mozc::storage::louds::LoudsTrieBuilder> key_trie_builder_;
  std::unique_ptr<mozc::storage::louds::BitVectorBasedArrayBuilder>
      token_array_builder_;

  // mapping from {left_id, right_id} to POS index (0--255)
  std::map<uint32, int> frequent_pos_;

  const SystemDictionaryCodecInterface *codec_;
  const DictionaryFileCodecInterface *file_codec_;

  DISALLOW_COPY_AND_ASSIGN(SystemDictionaryBuilder);
};
}  // namespace dictionary
}  // namespace mozc

#endif  // MOZC_DICTIONARY_SYSTEM_SYSTEM_DICTIONARY_BUILDER_H_
