//=============================================================================
// OverpassTile.js
//=============================================================================

/*:
 * @plugindesc Settings for bridges which characters can pass through.
 * @author Yoji Ojima
 *
 * @param Overpass Region ID
 * @desc The region ID for "overpass" such as bridges.
 * @default 255
 *
 * @param Gateway Region ID
 * @desc The region ID for "gateway" such as bridge ends.
 * @default 254
 *
 * @help
 *
 * This plugin uses region ID to determine a floor level.
 * In default, set 255 to bridge tiles and 254 to ends of them.
 *
 * Note: This plugin does not support the collision judgment modification
 *       between characters who are in different floors.
 */

/*:ja
 * @plugindesc キャラクターが下をくぐり抜けられる橋の設定です。
 * @author Yoji Ojima
 *
 * @param Overpass Region ID
 * @desc 橋などの立体交差部分に設定するリージョンIDです。
 * @default 255
 *
 * @param Gateway Region ID
 * @desc 橋の両端など、立体交差の入り口部分に設定するリージョンIDです。
 * @default 254
 *
 * @help
 *
 * このプラグインは、床の高さを決定するのにリージョンIDを使用します。
 * デフォルトでは橋の部分に255、その両端に254を設定してください。
 *
 * 注意：このプラグインは、異なる階層にいるキャラクター間の衝突判定修正は
 *       サポートしていません。
 */

(function () {
  var parameters = PluginManager.parameters("OverpassTile");
  var overpassRegionId = Number(parameters["Overpass Region ID"] || 255);
  var gatewayRegionId = Number(parameters["Gateway Region ID"] || 254);

  var _Tilemap_isOverpassPosition = Tilemap.prototype._isOverpassPosition;
  Tilemap.prototype._isOverpassPosition = function (mx, my) {
    var regionId = this._readMapData(mx, my, 5);
    if (regionId === overpassRegionId) {
      return true;
    } else {
      return _Tilemap_isOverpassPosition.call(this, mx, my);
    }
  };

  var _Game_CharacterBase_screenZ = Game_CharacterBase.prototype.screenZ;
  Game_CharacterBase.prototype.screenZ = function () {
    if (this._higherLevel) {
      return 5;
    } else {
      return _Game_CharacterBase_screenZ.call(this);
    }
  };

  var _Game_CharacterBase_isMapPassable =
    Game_CharacterBase.prototype.isMapPassable;
  Game_CharacterBase.prototype.isMapPassable = function (x, y, d) {
    if (_Game_CharacterBase_isMapPassable.call(this, x, y, d)) {
      var x2 = $gameMap.roundXWithDirection(x, d);
      var y2 = $gameMap.roundYWithDirection(y, d);
      var d2 = this.reverseDir(d);
      var regionId1 = $gameMap.regionId(x, y);
      var regionId2 = $gameMap.regionId(x2, y2);
      if (this._higherLevel && regionId1 !== gatewayRegionId) {
        return regionId2 === gatewayRegionId || regionId2 === overpassRegionId;
      }
      if (!this._higherLevel && regionId1 === overpassRegionId) {
        if (regionId2 === overpassRegionId) {
          var bit1 = (1 << (d / 2 - 1)) & 0x0f;
          var bit2 = (1 << (d2 / 2 - 1)) & 0x0f;
          var flags = $gameMap.tilesetFlags();
          var tileId1 = $gameMap.tileId(x, y, 0);
          var tileId2 = $gameMap.tileId(x, y, 1);
          var tileId3 = $gameMap.tileId(x2, y2, 0);
          var tileId4 = $gameMap.tileId(x2, y2, 1);
          if ((flags[tileId1] | flags[tileId2]) & bit1) {
            return false;
          }
          if ((flags[tileId3] | flags[tileId4]) & bit2) {
            return false;
          }
        }
        return regionId2 !== gatewayRegionId;
      }
      return true;
    } else {
      return false;
    }
  };

  var _Game_CharacterBase_refreshBushDepth =
    Game_CharacterBase.prototype.refreshBushDepth;
  Game_CharacterBase.prototype.refreshBushDepth = function () {
    _Game_CharacterBase_refreshBushDepth.call(this);
    var regionId = this.regionId();
    if (regionId === gatewayRegionId) {
      this._higherLevel = true;
    } else if (regionId !== overpassRegionId) {
      this._higherLevel = false;
    }
  };
})();