pragma solidity ^0.4.24;


    import "../lib/SafeMath.sol";
    import "./ITavern.sol";

    contract TavernBase is ITavern {
      using SafeMath for *;

      struct Tavern {
        uint256 initAt; // The time of tavern init
        int longitude; // The longitude of tavern
        int latitude; // The latitude of tavern
        uint8 popularity; // The popularity of tavern
        uint256 activeness; // The activeness of tavern
      }

      uint8 public constant decimals = 16; // longitude latitude decimals

      mapping(uint256 => Tavern) internal tokenTaverns;

      function _tavern(uint256 _tokenId) internal view returns (uint256, int, int, uint8, uint256) {
        Tavern storage tavern = tokenTaverns[_tokenId];
        return (
          tavern.initAt,
          tavern.longitude,
          tavern.latitude,
          tavern.popularity,
          tavern.activeness
        );
      }

      function _isBuilt(uint256 _tokenId) internal view returns (bool){
        Tavern storage tavern = tokenTaverns[_tokenId];
        return (tavern.initAt > 0);
      }

      function _build(
        uint256 _tokenId,
        int _longitude,
        int _latitude,
        uint8 _popularity
        ) internal {

        // Check whether tokenid has been initialized
        require(!_isBuilt(_tokenId));
        require(_isLongitude(_longitude));
        require(_isLatitude(_latitude));
        require(_popularity != 0);
        uint256 time = block.timestamp;
        Tavern memory tavern = Tavern(
          time, _longitude, _latitude, _popularity, uint256(0)
        );
        tokenTaverns[_tokenId] = tavern;
        emit Build(time, _tokenId, _longitude, _latitude, _popularity);
      }

      function _batchBuild(
        uint256[] _tokenIds,
        int[] _longitudes,
        int[] _latitudes,
        uint8[] _popularitys
        ) internal {
        uint256 i = 0;
        while (i < _tokenIds.length) {
          _build(
            _tokenIds[i],
            _longitudes[i],
            _latitudes[i],
            _popularitys[i]
          );
          i += 1;
        }


      }

      function _activenessUpgrade(uint256 _tokenId, uint256 _deltaActiveness) internal {
        require(_isBuilt(_tokenId));
        Tavern storage tavern = tokenTaverns[_tokenId];
        uint256 oActiveness = tavern.activeness;
        uint256 newActiveness = tavern.activeness.add(_deltaActiveness);
        tavern.activeness = newActiveness;
        tokenTaverns[_tokenId] = tavern;
        emit ActivenessUpgrade(_tokenId, oActiveness, newActiveness);
      }
      function _batchActivenessUpgrade(uint256[] _tokenIds, uint256[] __deltaActiveness) internal {
        uint256 i = 0;
        while (i < _tokenIds.length) {
          _activenessUpgrade(_tokenIds[i], __deltaActiveness[i]);
          i += 1;
        }
      }

      function _popularitySetting(uint256 _tokenId, uint8 _popularity) internal {
        require(_isBuilt(_tokenId));
        uint8 oPopularity = tokenTaverns[_tokenId].popularity;
        tokenTaverns[_tokenId].popularity = _popularity;
        emit PopularitySetting(_tokenId, oPopularity, _popularity);
      }

      function _batchPopularitySetting(uint256[] _tokenIds, uint8[] _popularitys) internal {
        uint256 i = 0;
        while (i < _tokenIds.length) {
          _popularitySetting(_tokenIds[i], _popularitys[i]);
          i += 1;
        }
      }

      function _isLongitude (
        int _param
      ) internal pure returns (bool){

        return(
          _param <= 180 * int(10 ** uint256(decimals))&&
          _param >= -180 * int(10 ** uint256(decimals))
          );
      }

      function _isLatitude (
        int _param
      ) internal pure returns (bool){
        return(
          _param <= 90 * int(10 ** uint256(decimals))&&
          _param >= -90 * int(10 ** uint256(decimals))
          );
        }
      }