//
//  WebTablet.js
//
//  Created by Anthony J. Thibault on 8/8/2016
//  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
//

var RAD_TO_DEG = 180 / Math.PI;
var X_AXIS = {x: 1, y: 0, z: 0};
var Y_AXIS = {x: 0, y: 1, z: 0};
var DEFAULT_DPI = 32;
var DEFAULT_WIDTH = 0.5;


var TABLET_URL =  "https://s3.amazonaws.com/hifi-public/tony/tablet.fbx"
// returns object with two fields:
//    * position - position in front of the user
//    * rotation - rotation of entity so it faces the user.
function calcSpawnInfo() {
    var front;
    var pitchBackRotation = Quat.angleAxis(20.0, X_AXIS);
    if (HMD.active) {
        front = Quat.getFront(HMD.orientation);
        var yawOnlyRotation = Quat.angleAxis(Math.atan2(front.x, front.z) * RAD_TO_DEG, Y_AXIS);
        return {
            position: Vec3.sum(Vec3.sum(HMD.position, Vec3.multiply(0.6, front)), Vec3.multiply(-0.5, Y_AXIS)),
            rotation: Quat.multiply(yawOnlyRotation, pitchBackRotation)
        };
    } else {
        front = Quat.getFront(MyAvatar.orientation);
        return {
            position: Vec3.sum(Vec3.sum(MyAvatar.position, Vec3.multiply(0.6, front)), {x: 0, y: 0.6, z: 0}),
            rotation: Quat.multiply(MyAvatar.orientation, pitchBackRotation)
        };
    }
}

// ctor
WebTablet = function (url, width, dpi, clientOnly) {
    var _this = this;
    var ASPECT = 4.0 / 3.0;
    var WIDTH = width || DEFAULT_WIDTH;
    var HEIGHT = WIDTH * ASPECT;
    var DEPTH = 0.025;
    var DPI = dpi || DEFAULT_DPI;
    var _this = this;

    var tabletProperties = {
        name: "WebTablet Tablet",
        type: "Model",
        modelURL: TABLET_URL,
        userData: JSON.stringify({
            "grabbableKey": {"grabbable": true}
        }),
        dimensions: {x: WIDTH, y: HEIGHT, z: DEPTH},
        parentID: MyAvatar.sessionUUID,
        parentJointIndex: -2
    }

    if (location) {
        tabletProperties.localPosition = location.localPosition;
        tabletProperties.localRotation = location.localRotation;
    } else {
        var spawnInfo = calcSpawnInfo();
        tabletProperties.position = spawnInfo.position;
        tabletProperties.rotation = spawnInfo.rotation;
    }

    this.tabletEntityID = Entities.addEntity(tabletProperties, clientOnly);

   

    var WEB_ENTITY_REDUCTION_FACTOR = {x: 0.78, y: 0.85};
    var WEB_ENTITY_Z_OFFSET = -0.01;
    var HOME_BUTTON_Y_OFFSET = -0.32;

    this.createWebEntity = function(url) {
        if (_this.webEntityID) {
            Entities.deleteEntity(_this.webEntityID);
        }
        _this.webEntityID = Entities.addEntity({
            name: "WebTablet Web",
            type: "Web",
            sourceUrl: url,
            dimensions: {x: WIDTH * WEB_ENTITY_REDUCTION_FACTOR.x,
                         y: HEIGHT * WEB_ENTITY_REDUCTION_FACTOR.y,
                         z: 0.1},
            localPosition: { x: 0, y: 0, z: WEB_ENTITY_Z_OFFSET },
            localRotation: Quat.angleAxis(180, Y_AXIS),
            shapeType: "box",
            dpi: DPI,
            parentID: _this.tabletEntityID,
            parentJointIndex: -1
        }, clientOnly);
    }

    this.createWebEntity(url);

    var homeButtonPosition = Vec3.sum(spawnInfo.position, Vec3.multiply(HOME_BUTTON_Y_OFFSET, Quat.getUp(webEntityRotation)));
    this.homeButtonEntity = Entities.addEntity({
        name: "homeButton",
        type: "Sphere",
        position: homeButtonPosition,
        dimensions: {x: 0.05, y: 0.05, z: 0.05},
        parentID: this.tabletEntityID,
        script: "https://people.ucsc.edu/~druiz4/scripts/homeButton.js"
        }, clientOnly);

    this.receive = function (channel, senderID, senderUUID, localOnly) {
        if (_this.homeButtonEntity == senderID) {
            if (_this.clicked) {
              Entities.editEntity(_this.homeButtonEntity, {color: {red: 0, green: 255, blue: 255}});
              _this.clicked = false;
            } else {
              Entities.editEntity(_this.homeButtonEntity, {color: {red: 255, green: 255, blue: 0}});
              _this.clicked = true;
            }
        }
    }

    this.state = "idle";

    this.getRoot = function() {
        return Entities.getWebViewRoot(_this.webEntityID);
    }

    this.getLocation = function() {
        return Entities.getEntityProperties(_this.tabletEntityID, ["localPosition", "localRotation"]);
    };
    this.clicked = false;
};

WebTablet.prototype.destroy = function () {
    Entities.deleteEntity(this.webEntityID);
    Entities.deleteEntity(this.tabletEntityID);
    Entities.deleteEntity(this.homeButtonEntity);
};
WebTablet.prototype.pickle = function () {
    return JSON.stringify({webEntityID: this.webEntityID, tabletEntityID: this.tabletEntityID});
};


WebTablet.prototype.register = function() {
    Messages.subscribe("home");
    Messages.messageReceived.connect(this.receive);
}

WebTablet.prototype.unregister = function() {
    Messages.unsubscribe("home");
    Messages.messageReceived.disconnect(this.receive);
}

WebTablet.unpickle = function (string) {
    if (!string) {
        return;
    }
    var tablet = JSON.parse(string);
    tablet.__proto__ = WebTablet.prototype;
    return tablet;
};