//
// roosterChase.js
// A script to make the rooster chase people in hifi://Mexico
// 
// Author: Elisa Lupin-Jimenez
// Copyright High Fidelity 2018
//
// Licensed under the Apache 2.0 License
// See accompanying license file or http://apache.org/
//
// All assets are under CC Attribution Non-Commerical
// http://creativecommons.org/licenses/
//

(function() {

    var STANDING_URL = Script.resolvePath("./assets/rooster/rooster_standing.fbx");
    var RUNNING_URL = Script.resolvePath("./assets/rooster/rooster_running.fbx");
    var INTERVAL = 200;
    var DISTANCE_FROM_START = 0.25;

    var STANDING_ANIMATION = {
        url: STANDING_URL,
        fps: 30,
        firstFrame: 1,
        lastFrame: 200
    };

    var RUNNING_ANIMATION = {
        url: RUNNING_URL,
        fps: 24,
        firstFrame: 1,
        lastFrame: 90
    };

    var moveTowardAvatarInterval;
    var moveBackToStartInterval;
    var roosterID;
    var position;
    var startingPosition;
    var isAtDestination;

    this.preload = function(entityID) {
        var roosterArray = Entities.getChildrenIDs(entityID);
        roosterArray.forEach(function(roosterEntityID) {
            roosterID = roosterEntityID;
        });
        startingPosition = Entities.getEntityProperties(roosterID, "position").position;
    };

    function moveTowardAvatar(isAtDestination) {
        if (isAtDestination === false) {
            position = Entities.getEntityProperties(roosterID, "position").position;
            var destination = Vec3.multiply(-2, Vec3.normalize(Vec3.subtract(position, MyAvatar.position)));
            var newProperties = {
                "rotation": Quat.multiply(MyAvatar.orientation, {x:0, y:0, z:0, w:0}),
                "velocity": destination
            };
            Entities.editEntity(roosterID, newProperties);

            if (Vec3.distance(MyAvatar.position, position) < DISTANCE_FROM_START) {
                var updateProperties = {
                    velocity: {x:0, y:0, z:0},
                    animation: STANDING_ANIMATION
                };
                Entities.editEntity(roosterID, updateProperties);
                isAtDestination = true;
            }
        }
    }

    function moveBackToStart(isAtDestination) {
        if (isAtDestination === false) {
            position = Entities.getEntityProperties(roosterID, "position").position;
            var destination = Vec3.multiply(-2, Vec3.normalize(Vec3.subtract(position, startingPosition)));
            var newProperties = {
                "rotation": Quat.lookAtSimple(startingPosition, position),
                "velocity": destination
            };
            Entities.editEntity(roosterID, newProperties);

            if (Vec3.distance(startingPosition, position) < DISTANCE_FROM_START) {
                var updateProperties = {
                    velocity: {x:0, y:0, z:0},
                    animation: STANDING_ANIMATION
                };
                Entities.editEntity(roosterID, updateProperties);
                isAtDestination = true;
            }
        }
    }

    this.enterEntity = function(entityID) {
        if (moveBackToStartInterval) {
            Script.clearInterval(moveBackToStartInterval);
            moveBackToStartInterval = null;
        }
        var updateAnimation = {
            animation: RUNNING_ANIMATION
        };
        isAtDestination = false;
        Entities.editEntity(roosterID, updateAnimation);
        moveTowardAvatarInterval = Script.setInterval(moveTowardAvatar(isAtDestination), INTERVAL);
    };

    this.leaveEntity = function(entityID) {
        if (moveTowardAvatarInterval) {
            Script.clearInterval(moveTowardAvatarInterval);
            moveTowardAvatarInterval = null;
        }
        var updateAnimation = {
            animation: RUNNING_ANIMATION
        };
        isAtDestination = false;
        Entities.editEntity(roosterID, updateAnimation);
        moveBackToStartInterval = Script.setInterval(moveBackToStart(isAtDestination), INTERVAL);
    };

});