//
//  boom.js 
// 
//  An object with this entity script will blow up when clicked or grabbed,
//  throwing nearby objects flying.  After a time period, it will return all the objects to their original positions.
//
//  Created by Philip Rosedale on March 7, 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
//

(function() {
    var entityID,
        wantDebug = true,
        BLAST_FORCE = 10,
        BLAST_RADIUS = 10,
        BLAST_STEPDOWN = 10.0,
        TIME_TILL_RESTORE = 10.0,
        NETWORK_MAX_ROUNDRIP_MSECS = 1000,
        COUNTDOWN_TIME_MSECS = 2000,
        ZERO_GRAVITY = { x: 0, y: 0, z: 0 },
        FALL_GRAVITY = { x: 0, y: -4.0, z: 0 },
        SOUND_BOOM = SoundCache.getSound("http://hifi-content.s3.amazonaws.com/alan/dev/Audio/bigboom_converted.wav"),
        SOUND_COUNTDOWN = SoundCache.getSound("https://s3.amazonaws.com/hifi-public/philip/countdown_converted.wav"),
        RED = { red: 255, green: 0, blue: 0 },
        affected = [],
        state = "ready"
    function printDebug(message) {
        if (wantDebug) {
            print(message);
        }
    }

    function blowStuffUp(position, force, radius, stepdown, gravity) {
	    var stuff = Entities.findEntities(position, radius);
	    printDebug("Blowing " + stuff.length + " things up");
	    for (var i = 0; i < stuff.length; i++) {
	        var properties = Entities.getEntityProperties(stuff[i]);
	        if (!properties.locked && (stuff[i] != entityID)) {
	        	//  Store original position
	        	affected.push({ entityID: stuff[i], 
	        					position: properties.position, 
	        					rotation: properties.rotation,
	        					gravity: properties.gravity,
	        					dynamic: properties.dynamic });
	            var diff = Vec3.subtract(Vec3.sum(properties.position, { x: 0, y: -stepdown, z: 0 }), position);
	            var distance = Vec3.length(diff);
	            var velocity = Vec3.sum(properties.velocity, Vec3.multiply(force, Vec3.normalize(diff)));
	            var angularVelocity = { x: Math.random() * force, y: Math.random() * force, z: Math.random() * force };
	            Entities.editEntity(stuff[i], { dynamic: true, gravity: gravity, velocity: velocity, 
	                                            angularVelocity: angularVelocity });
	        }
	    }
    }

    function replaceStuff() {
    	if (state == "waitingToReplace") {
    		printDebug("replace phase 1");
    		for (var i = 0; i < affected.length; i++) {
    			//  Set everything back the first time and non-dynamic, wait for a network RT
    			Entities.editEntity(affected[i].entityID, { position: affected[i].position, 
    														rotation: affected[i].rotation, 
    														gravity: ZERO_GRAVITY,
    														dynamic: false,
    														velocity: { x: 0, y: 0, z: 0 },
    														angularVelocity: { x: 0, y: 0, z: 0 } });	
    		}
    		state = "replacePhase2";
    		Script.setTimeout(replaceStuff, NETWORK_MAX_ROUNDRIP_MSECS);
    	} else {
    		printDebug("replace phase 2");
    		for (var i = 0; i < affected.length; i++) {
    			//  After network RT, do it again with original dynamic state
    			Entities.editEntity(affected[i].entityID, { position: affected[i].position, 
    														rotation: affected[i].rotation, 
    														gravity: affected[i].gravity,
    														dynamic: affected[i].dynamic,
    														velocity: { x: 0, y: 0, z: 0 },
    														angularVelocity: { x: 0, y: 0, z: 0 } });	
    		}
 			state = "ready";
 			affected = [];
    	}
    }

    function maybeBlowUp() {
    	if (state == "ready") {
    		printDebug("start countdown");
    		var properties = Entities.getEntityProperties(entityID);
    		Audio.playSound(SOUND_COUNTDOWN, {
            	         	position: properties.position,
            	            volume: 1.0,
            	            loop: false
                });
    		state = "countdown";
    		Script.setTimeout(maybeBlowUp, COUNTDOWN_TIME_MSECS);
    	}
    	else if (state == "countdown") {
    		//  blow up
    		printDebug("Explode!");
    		var properties = Entities.getEntityProperties(entityID);
    		Entities.editEntity(entityID, { color: RED });
        	Audio.playSound(SOUND_BOOM, {
            	            position: properties.position,
            	            volume: 1.0,
            	            loop: false
                });
        	blowStuffUp(properties.position, BLAST_FORCE, BLAST_RADIUS, BLAST_STEPDOWN, FALL_GRAVITY);
        	Script.setTimeout(replaceStuff, TIME_TILL_RESTORE * 1000);
        	state = "waitingToReplace";
    	}
    }

    this.startNearGrab = function() {
    	maybeBlowUp();
    }
    this.mousePressOnEntity = function() {
    	maybeBlowUp();
    }

    this.preload = function(givenEntityID) {
        printDebug("load boom...");
        entityID = givenEntityID;
    };

    this.unload = function() {
        printDebug("Unload boom...");
    };

});