// selectReachable.js

(function () {
  /*global adventurejs A*/

  var p = adventurejs.Parser.prototype;

  /**
   * Exclude from a list of assets all assets that are not reachable by subject.
   * @method adventurejs.Parser#selectReachable
   * @memberOf adventurejs.Parser
   * @param {Array} list
   * @returns {Array}
   */
  p.selectReachable = function Parser_selectReachable(list) {
    if ("string" === typeof list) list = [list];
    if (!Array.isArray(list)) {
      this.game.log(
        "L1096",
        "warn",
        "critical",
        "selectReachable.js > received non-array",
        "Parser"
      );
      return [];
    }

    var input = this.game.getInput();
    var subject = input.getSubject();
    var currentRoom = this.game.getCurrentRoom();
    var nest_asset = subject.getNestAsset();
    var nest_ancestor = this.game.getAsset(subject.getNestAnscestorId());
    var foundObjects = [];
    var roomObjects = [];
    var containers = [];
    for (var i = 0; i < list.length; i++) {
      var object_parent, object_ancestor, object_ancestor;
      var object = this.game.getAsset(list[i]);

      if (!object) continue;

      // abstractions are always reachable
      if (object.is.abstract) {
        foundObjects.push(list[i]);
        continue;
      }

      // @TODO rule for globals?
      // if (object.is.global) {
      //   foundObjects.push(list[i]);
      //   continue;
      // }

      // check if input is unparsed substance
      if (object instanceof adventurejs.Substance) {
        // foundObjects.push(list[i]);
        // continue;
        //   console.warn( " - selectReachable " + object.id + " is substance" );
        if (!roomObjects.length) {
          roomObjects = [currentRoom.id].concat(
            currentRoom.getAllNestedContents()
          );
        }
        for (var j = 0; j < roomObjects.length; j++) {
          var roomObject = this.game.getAsset(roomObjects[j]);
          if (!subject.knowsAbout(roomObject)) continue;
          var aspect = roomObject.containsSubstance(object.id);
          if (aspect) {
            console.warn(
              "selectReachable.js > " +
                roomObject.id +
                ".containsSubstance( " +
                object.id +
                " ): " +
                roomObject.containsSubstance(object.id)
            );
            // becomes for ex: bowl:in:water which can be handled by verbs
            if (!roomObject.aspects[aspect].vessel.is_known) continue;
            containers.push(roomObject.id + ":" + aspect + ":" + object.id);
            // foundObjects.push(roomObject.id + ":" + aspect + ":" + object.id);
          }
        }
        if (containers.length) {
          containers = this.selectReachable(containers);
          if (containers.length) {
            foundObjects = foundObjects.concat(containers);
          }
        }
        continue;
      }

      // if object is a plug, test against its parent
      if (object.isConnectedToAsset("plug", object.getPlaceAsset(), "to_dov")) {
        object = object.getPlaceAsset();
      }

      object_parent = object.getPlaceAsset();
      object_ancestor = this.game.getAsset(object.getAncestorId());

      // subject is carrying it, ok
      //if( object.isWithin( subject ) ) {
      if (object.isWithin(subject)) {
        foundObjects.push(list[i]);
        continue;
      }

      // subject is in it, ok
      if (subject.isNested() && object.id === nest_asset.id) {
        foundObjects.push(list[i]);
        continue;
      }

      // if subject is nested and trying to get up/down
      if (
        (subject.isNested() && object.direction === "down") ||
        object.direction === "up"
      ) {
        foundObjects.push(list[i]);
        continue;
      }

      // if subject is in/on/under/behind something
      if (
        subject.isNested() &&
        // subject is not nested in object
        object.id !== nest_asset.id &&
        // it's not top of the nest
        object.id !== nest_ancestor.id &&
        // it's not in inventory
        //&& object_ancestor.id !== subject.id

        // it's not nested in same container as subject
        object_parent.id !== nest_asset.id &&
        // it's not nested in same container as subject
        object_ancestor.id !== nest_ancestor.id &&
        // it's not explicitly reachable from thing subject is nested in
        !nest_asset.canCharacterReachThatFromThis(object) &&
        // it's not inside another thing that is
        // explicitly reachable from thing subject is nested in
        !nest_asset.canCharacterReachThatFromThis(object_ancestor)
      ) {
        console.warn("reachable excluded", object.id);
        continue;
      }

      // is subject on the floor, but object not on the floor?
      // this check might be too restrictive
      if (
        !subject.isNested() &&
        subject.isOnFloor() &&
        !(object instanceof adventurejs.Floor) &&
        object.getPlaceAssetId() !== subject.getPlaceAssetId()
      ) {
        console.warn(
          "Exclude " + object.name + " because subject is on the floor."
        );
        continue;
      }

      // is subject at different y height?
      // figure out y overlap
      var range = object.getYRange();
      // is subject close enough on y?
      if (subject.position.y < range.min || subject.position.y > range.max) {
        console.warn(
          "Exclude " + object.name + " because subject at different y."
        );
        continue;
      }

      /*
				TODO
				on top of a tall object?
        behind glass?
        inside something that's closed?
			*/

      foundObjects.push(list[i]);
    }

    //console.warn( "selectReachable returned " + JSON.stringify(foundObjects) );
    return foundObjects;
  };
})();