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// Classes managing dictionary entries.

#include "rewriter/dictionary_generator.h"

#include <cstdint>
#include <ostream>
#include <string>
#include <tuple>
#include <utility>

#include "absl/log/check.h"
#include "absl/strings/string_view.h"
#include "data_manager/data_manager.h"
#include "dictionary/pos_matcher.h"
#include "dictionary/user_pos.h"

namespace mozc {
namespace rewriter {
namespace {

void MergeTokenString(std::string& base, std::string& new_string) {
  if (!new_string.empty()) {
    base = std::move(new_string);
  }
}

}  // namespace

void Token::MergeFrom(Token new_token) {
  sorting_key =
      new_token.sorting_key == 0 ? sorting_key : new_token.sorting_key;
  MergeTokenString(key, new_token.key);
  MergeTokenString(value, new_token.value);
  MergeTokenString(pos, new_token.pos);
  MergeTokenString(description, new_token.description);
  MergeTokenString(additional_description, new_token.additional_description);
}

bool operator==(const Token& lhs, const Token& rhs) {
  return std::tie(lhs.key, lhs.value, lhs.pos) ==
         std::tie(rhs.key, rhs.value, rhs.pos);
}

bool operator<(const Token& lhs, const Token& rhs) {
  return std::tie(lhs.key, lhs.sorting_key, lhs.value) <
         std::tie(rhs.key, rhs.sorting_key, rhs.value);
}

DictionaryGenerator::DictionaryGenerator(const DataManager& data_manager) {
  const dictionary::PosMatcher pos_matcher(data_manager.GetPosMatcherData());
  open_bracket_id_ = pos_matcher.GetOpenBracketId();
  close_bracket_id_ = pos_matcher.GetCloseBracketId();
  user_pos_ = dictionary::UserPos::CreateFromDataManager(data_manager);
}

const Token& DictionaryGenerator::AddToken(Token token) {
  // Take the token as node_type of tokens_.
  auto node = tokens_.extract(token);
  if (node.empty()) {
    return *tokens_.insert(std::move(token)).first;
  } else {
    node.value().MergeFrom(std::move(token));
    return *tokens_.insert(std::move(node.value())).first;
  }
}

bool DictionaryGenerator::Output(std::ostream& os) const {
  uint32_t num_same_keys = 0;
  std::string prev_key;
  for (const Token& token : tokens_) {
    absl::string_view pos = token.pos;

    // Update the number of the sequence of the same keys
    if (prev_key == token.key) {
      ++num_same_keys;
    } else {
      num_same_keys = 0;
      prev_key = token.key;
    }
    const uint32_t cost = 10 * num_same_keys;

    uint16_t id;
    if (pos == "括弧開") {
      id = open_bracket_id_;
    } else if (pos == "括弧閉") {
      id = close_bracket_id_;
    } else {
      id = user_pos_->GetPosIds(pos).value();
    }

    // Output in mozc dictionary format
    os << token.key << "\t" << id << "\t" << id << "\t" << cost << "\t"
       << token.value << "\t" << token.description << "\t"
       << token.additional_description << std::endl;
  }
  return true;
}

}  // namespace rewriter
}  // namespace mozc
