//
//  toggleFlyButton.js
//
//  created by Zach Fox on 2019-01-10
//  Copyright 2019 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 _this;
    var flyingEnabled;
    var statusTextEntityID;
    // Since there's no signal in-engine for when a user's flying preferences
    // change, we need to check the settings on an interval.
    // See:
    // https://highfidelity.fogbugz.com/f/cases/20686/Add-flyingPrefDesktopChanged-and-flyingPrefHMDChanged-signals
    var updateStatusTextInterval;

    var UPDATE_TEXT_DELAY_MS = 150;
    var UPDATE_STATUS_TEXT_INTERVAL_MS = 2500;

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

    ToggleFlyButton.prototype = {
        // Set up the entity ID, rez the status text Local Entity, and connect the
        // HMD displayModeChanged signal
        preload: function(entityID){
            _this.entityID = entityID;
            _this.rezStatusTextLocalEntity();
            HMD.displayModeChanged.connect(_this.updateStatusText);
            updateStatusTextInterval = Script.setInterval(_this.updateStatusText, UPDATE_STATUS_TEXT_INTERVAL_MS);
        },
        
        // When the script goes down, delete the status text Local Entity (if it exists),
        // and disconnect our signal
        unload: function() {
            if (statusTextEntityID) {
                Entities.deleteEntity(statusTextEntityID);
            }
            HMD.displayModeChanged.disconnect(_this.updateStatusText);
            Script.clearInterval(updateStatusTextInterval);
        },

        // When the user uses the mouse OR their hand controller lasers
        // to click on the button...
        mousePressOnEntity: function(entityID, mouseEvent) {
            if (!mouseEvent.button === "Primary") {
                return;
            }
            _this.toggleFlyingEnabled();
        },
        
        // Create the status text Local Entity that'll show Flying Preference
        // status.
        rezStatusTextLocalEntity: function() {
            statusTextEntityID = Entities.addEntity({
                "parentID": _this.entityID,
                "type": "Text",
                // eslint-disable-next-line no-magic-numbers
                "localPosition": [-0.5593090057373047, 0.15, 0.102],
                // eslint-disable-next-line no-magic-numbers
                "localRotation": Quat.fromVec3Degrees([-90, 0, 0]),
                "lineHeight": 0.11,
                // eslint-disable-next-line no-magic-numbers
                "dimensions": [0.512, 0.111, 0.05],
                "topMargin": 0,
                "rightMargin": 0,
                "bottomMargin": 0,
                "leftMargin": 0
            }, "local");
            _this.updateStatusText();
        },
        
        // Update the status text Local Entity according to whether or not
        // the user has Flying enabled.
        updateStatusText: function() {
            // This should never happen, but protect against trying to
            // edit the entity if the entity doesn't exist.
            if (!statusTextEntityID) {
                return;
            }

            flyingEnabled = MyAvatar.getFlyingEnabled();
            
            var entityText = (flyingEnabled ? "ENABLED" : "DISABLED");
            
            Entities.editEntity(statusTextEntityID, {
                "text": entityText
            });
        },
        
        // This'll toggle Flying in VR mode ONLY. It won't do anything in Desktop mode.
        toggleFlyingEnabled: function() {
            if (!HMD.active) {
                return;
            }
            
            console.log("User clicked toggleFlyButton while in VR mode! Setting flying preference to: " + !flyingEnabled);
            
            MyAvatar.setFlyingHMDPref(!flyingEnabled);
            
            // This preference doesn't update instantaneously,
            // so we have to wait a few milliseconds before updating the Local Entity's text.
            Script.setTimeout(function() {
                _this.updateStatusText();
            }, UPDATE_TEXT_DELAY_MS);
        }
    };

    return new ToggleFlyButton();
});