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--
-- All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
-- its licensors.
--
-- For complete copyright and license terms please see the LICENSE at the root of this
-- distribution (the "License"). All use of this software is governed by the License,
-- or, if provided, by the license below or the license accompanying this file. Do not
-- remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--
--
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-- Wind area
WindArea = 
{
	Properties = 
	{
		bActive = 1, --[0,1,1,"Defines whether wind is blowing or not."]
		Size = { x=10,y=10,z=10 },
		bEllipsoidal = 1, --[0,1,1,"Forces an ellipsoidal falloff."]
		FalloffInner = 0, --[0,100,0.1,"Distance after which the distance-based falloff begins."]
		Dir = { x=0,y=0,z=0 },
		Speed = 20, --[0,100,0.1,"Defines whether wind is blowing or not."]
		AirResistance = 0, --[0,100,0.1,"Causes very light physicalised objects to experience a buoyancy force, if >0."]
		AirDensity = 0, --[0,100,0.1,"Causes physicalised objects moving through the air to slow down, if >0."]
	},
	Editor = 
	{
		Icon = "Tornado.bmp",
	},
	_PhysTable = { Area={}, },
}

-------------------------------------------------------
function WindArea:OnLoad(table)
  self.bActive = table.bActive  
end

-------------------------------------------------------
function WindArea:OnSave(table)
  table.bActive = self.bActive
end

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function WindArea:OnInit()
	self.bActive = self.Properties.bActive;
	if (self.bActive == 1) then
		self:PhysicalizeThis();
	end
end

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-- OnPropertyChange called only by the editor.
------------------------------------------------------------------------------------------------------
function WindArea:OnPropertyChange()
	self.bActive = self.Properties.bActive;
	self:PhysicalizeThis();
end

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-- OnReset called only by the editor.
------------------------------------------------------------------------------------------------------
function WindArea:OnReset()
end

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function WindArea:PhysicalizeThis()
	if (self.bActive == 1) then
		local Properties = self.Properties;
		local Area = self._PhysTable.Area;
		if (Properties.bEllipsoidal == 1) then
			Area.type = AREA_SPHERE;
			Area.radius = LengthVector(Properties.Size) * 0.577;
		else
			Area.type = AREA_BOX;
		end
		Area.box_max = Properties.Size;
		Area.box_min = { x = -Area.box_max.x, y = -Area.box_max.y, z = -Area.box_max.z };
		if (Properties.bEllipsoidal == 1 or Properties.FalloffInner < 1) then
			Area.falloffInner = Properties.FalloffInner;
		else
			Area.falloffInner = -1;
		end
		if (Properties.Dir.x == 0 and Properties.Dir.y == 0 and Properties.Dir.z == 0) then
			Area.uniform = 0;
			Area.wind = {x = 0, y = 0, z = Properties.Speed};
		else
			Area.uniform = 2;
			Area.wind = { x = Properties.Dir.x * Properties.Speed, y = Properties.Dir.y * Properties.Speed, z = Properties.Dir.z * Properties.Speed };
		end
		Area.resistance = Properties.AirResistance;
		Area.density = Properties.AirDensity;
		self:Physicalize( 0,PE_AREA,self._PhysTable );
	else
		self:DestroyPhysics();
	end
end


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-- Event Handlers
------------------------------------------------------------------------------------------------------
function WindArea:Event_Activate()
	if (self.bActive ~= 1) then
		self.bActive = 1;
		self:PhysicalizeThis();
	end
end

function WindArea:Event_Deactivate()
	if (self.bActive ~= 0) then
		self.bActive = 0;
		self:PhysicalizeThis();
	end
end

function WindArea:Event_Speed( sender, Speed )
	self.Properties.Speed = Speed;
	self:OnPropertyChange();
end

WindArea.FlowEvents =
{
	Inputs =
	{
		Deactivate = { WindArea.Event_Deactivate, "bool" },
		Activate = { WindArea.Event_Activate, "bool" },
		Speed = { WindArea.Event_Speed, "float" },
	},
	Outputs =
	{
		Deactivate = "bool",
		Activate = "bool",
	},
}