"use strict";

//
//  hmd.js
//  scripts/system/
//
//  Created by Howard Stearns on 2 Jun 2016
//  Copyright 2016 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
//
/*globals HMD, Toolbars, Script, Menu, Tablet, Camera */

(function() { // BEGIN LOCAL_SCOPE

var headset; // The preferred headset. Default to the first one found in the following list.
var displayMenuName = "Display";
var desktopMenuItemName = "Desktop";
['OpenVR (Vive)', 'Oculus Rift'].forEach(function (name) {
    if (!headset && Menu.menuItemExists(displayMenuName, name)) {
        headset = name;
    }
});

var controllerDisplay = false;
function updateControllerDisplay() {
    if (HMD.active && Menu.isOptionChecked("Third Person")) {
        if (!controllerDisplay) {
            HMD.requestShowHandControllers();
            controllerDisplay = true;
        }
    } else if (controllerDisplay) {
        HMD.requestHideHandControllers();
        controllerDisplay = false;
    }
}

var button;
var toolBar = null;
var tablet = null;

if (Settings.getValue("HUDUIEnabled")) {
    toolBar = Toolbars.getToolbar("com.highfidelity.interface.toolbar.system");
} else {
    tablet = Tablet.getTablet("com.highfidelity.interface.tablet.system");
}

// Independent and Entity mode make people sick. Third Person and Mirror have traps that we need to work through.
// Disable them in hmd.
var desktopOnlyViews = ['Mirror', 'Independent Mode', 'Entity Mode'];
function onHmdChanged(isHmd) {
    //TODO change button icon when the hmd changes
    if (isHmd) {
        button.editProperties({
            icon: "icons/tablet-icons/switch-a.svg",
            text: "DESKTOP"
        });
    } else {
        button.editProperties({
            icon: "icons/tablet-icons/switch-i.svg",
            text: "VR"
        });
    }
    desktopOnlyViews.forEach(function (view) {
        Menu.setMenuEnabled("View>" + view, !isHmd);
    });
    updateControllerDisplay();
}
function onClicked(){
    var isDesktop = Menu.isOptionChecked(desktopMenuItemName);
    Menu.setIsOptionChecked(isDesktop ? headset : desktopMenuItemName, true);
}
if (headset) {
    if (Settings.getValue("HUDUIEnabled")) {
        button = toolBar.addButton({
            objectName: "hmdToggle",
            imageURL: Script.resolvePath("assets/images/tools/switch.svg"),
            visible: true,
            alpha: 0.9
        });
    } else {
        button = tablet.addButton({
            icon: "icons/tablet-icons/switch-a.svg",
            text: "SWITCH"
        });
    }
    onHmdChanged(HMD.active);

    button.clicked.connect(onClicked);
    HMD.displayModeChanged.connect(onHmdChanged);
    Camera.modeUpdated.connect(updateControllerDisplay);

    Script.scriptEnding.connect(function () {
        button.clicked.disconnect(onClicked);
        if (tablet) {
            tablet.removeButton(button);
        }
        if (toolBar) {
            toolBar.removeButton("hmdToggle");
        }
        HMD.displayModeChanged.disconnect(onHmdChanged);
        Camera.modeUpdated.disconnect(updateControllerDisplay);
    });
}

}()); // END LOCAL_SCOPE