//
//  avatarCounter.js
//
//  Created by Rebecca Stankus on 07/09/2018.
//  Copyright 2018 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

(function() {
    var UPDATE_INTERVAL = 1000;
    var HALF_MULTIPLIER = 0.5;
    var _this;

    var counterText;

    var AvatarCounter = function() {
        _this = this;
    };

    AvatarCounter.prototype = {
        interval: null,

        preload: function(entityID) {
            _this.entityID = entityID;
            Entities.getChildrenIDs(_this.entityID).forEach(function(childID) {
                var name = Entities.getEntityProperties(childID, 'name').name;
                if (name.indexOf("Counter") !== -1) {
                    counterText = childID;
                }
            });
            _this.interval = Script.setInterval(function() {
                var count;
                var zoneProperties = Entities.getEntityProperties(_this.entityID,
                    ["position", "dimensions","rotation", "userData"]);
                AvatarList.getAvatarIdentifiers().forEach(function(avatarID) {
                    var avatar = AvatarList.getAvatar(avatarID);
                    if (_this.isPositionInsideBox(avatar.position, zoneProperties)) {
                        count++;
                    }
                });
                Entities.editEntity(counterText, { text: JSON.stringify(count) });
            }, UPDATE_INTERVAL);
        },

        isPositionInsideBox: function(position, boxProperties) {
            var localPosition = Vec3.multiplyQbyV(Quat.inverse(boxProperties.rotation),
                Vec3.subtract(position, boxProperties.position));
            var halfDimensions = Vec3.multiply(boxProperties.dimensions, HALF_MULTIPLIER);
            return -halfDimensions.x <= localPosition.x &&
                    halfDimensions.x >= localPosition.x &&
                   -halfDimensions.y <= localPosition.y &&
                    halfDimensions.y >= localPosition.y &&
                   -halfDimensions.z <= localPosition.z &&
                    halfDimensions.z >= localPosition.z;
        },

        unload: function() {
            if (_this.interval) {
                Script.clearInterval(_this.interval);
            }
        }
    };
        
    return new AvatarCounter;
});