/*
    materialPulser.js

    Created by Mark Brosche, on 2/28/19


    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 _entityID = null;
    var pulseInterval = false;
    var userData = null;
    var fps = null;
    var frequency = null;
    var props = null;
    var increasing = false;
    var brightProps = [];
    var dullProps = [];
    var delta = null;
    function preload(entityID) {
        _entityID = entityID;
        userData = Entities.getEntityProperties(_entityID, ["userData"]).userData;
        if (!userData || userData === "{}") {
            print("spawner ", _entityID, " is missing user data.");
            return;
        }
        try {
            userData = JSON.parse(userData);
            fps = userData.speedFPS;
            frequency = 1000/fps;
            brightProps = userData.maxEmissive;
            dullProps = userData.minEmissive;
            delta = Vec3.multiply(1/(2*fps), brightProps);
        } catch (e) {
            console.log(e, "error parsing userData -- PRELOAD");
            if (pulseInterval) {
                Script.clearInterval(pulseInterval);
                pulseInterval = false;
            }
            return;
        }
        if (pulseInterval) {
            Script.clearInterval(pulseInterval);
            pulseInterval = false;
        }
        pulseInterval = Script.setInterval(function() {
            props = Entities.getEntityProperties(_entityID, ["materialData"]);
            try {
                props.materials = JSON.parse(props.materialData);
            } catch (e) {
                console.log(e, "error parsing materialData -- INTERVAL");
                if (pulseInterval) {
                    Script.clearInterval(pulseInterval);
                    pulseInterval = false;
                }
                return;
            }
            var emissive = [
                props.materials.materials.emissive.x, 
                props.materials.materials.emissive.y, 
                props.materials.materials.emissive.z
            ];
            if (emissive >= brightProps && increasing) {
                decrementBright();
                increasing = false;
            } else if (emissive <= dullProps && !increasing) {
                incrementBright();
                increasing = true;
            } else if (increasing) {
                incrementBright();
            } else {
                decrementBright();
            }
        }, frequency);
    }

    function incrementBright() {
        props = Entities.getEntityProperties(_entityID, ["name", "materialData"]);
        try {
            props.materials = JSON.parse(props.materialData);
            
        } catch (e) {
            console.log(e, "error parsing materialData -- INCREMENT");
            if (pulseInterval) {
                Script.clearInterval(pulseInterval);
                pulseInterval = false;
            }
            return;
        }
        props.materials.materials.emissive = Vec3.sum(props.materials.materials.emissive,delta);
        Entities.editEntity(_entityID, {
            "materialData": JSON.stringify(props.materials)
        });
    }

    function decrementBright() {
        props = Entities.getEntityProperties(_entityID, ["name", "materialData"]);
        try {
            props.materials = JSON.parse(props.materialData);
            
        } catch (e) {
            console.log(e, "error parsing materialData -- DECREMENT");
            if (pulseInterval) {
                Script.clearInterval(pulseInterval);
                pulseInterval = false;
            }
            return;
        }
        props.materials.materials.emissive = Vec3.subtract(props.materials.materials.emissive,delta);
        Entities.editEntity(_entityID, {
            "materialData": JSON.stringify(props.materials)
        });
    }

    function unload() {
        if (pulseInterval) {
            Script.clearInterval(pulseInterval);
            pulseInterval = false;
        }
    }


    function MaterialPulser() {}
    

    MaterialPulser.prototype = {
        preload: preload,
        incrementBright: incrementBright,
        decrementBright: decrementBright,
        unload: unload
    };


    return new MaterialPulser();
});