----------------------------------------------------------------------------------------------------
--
-- 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.
--
--
----------------------------------------------------------------------------------------------------
Light =
{
	Properties =
	{
		_nVersion = -1,
		bActive = 1, --[0,1,1,"Turns the light on/off."]
		Radius = 10, --[0,100,1,"Specifies how far from the source the light affects the surrounding area."]
		fAttenuationBulbSize = 0.05, --[0,100,0.1,"Specifies the radius of the area light bulb."]
		Style =
		{
			nLightStyle = 0, --[0,50,1,"Specifies a preset animation for the light to play."]
			fAnimationSpeed = 1, --[0,100,0.1,"Specifies the speed at which the light animation should play."]
			nAnimationPhase = 0, --[0,100,1,"This will start the light style at a different point along the sequence."]
			bAttachToSun = 0, --[0,1,1,"When enabled, sets the Sun to use the Flare properties for this light."]
			lightanimation_LightAnimation = "",
			bTimeScrubbingInTrackView = 0,
			_fTimeScrubbed = 0,
			bFlareEnable = 1, --[0,1,1,"Toggles the flare effect on or off for this light."]
			flare_Flare = "",
			fFlareFOV = 360, --[0,360,1,"FOV for the flare."]
		},
		Projector =
		{
			texture_Texture = "",
			fProjectorFov = 90, --[0,180,1,"Specifies the Angle on which the light texture is projected."]
			fProjectorNearPlane = 0, --[-100,100,0.1,"Set the near plane for the projector, any surfaces closer to the light source than this value will not be projected on."]
		},
		Color =
		{
			clrDiffuse = { x=1,y=1,z=1 },
			fDiffuseMultiplier = 1, --[0,999,0.1,"Control the strength of the diffuse color."]
			fSpecularMultiplier = 1, --[0,999,0.1,"Control the strength of the specular brightness."]
		},
		Options =
		{
			bAffectsThisAreaOnly = 1, --[0,1,1,"Set this parameter to false to make light cast in multiple visareas."]
			bIgnoresVisAreas = 0, --[0,1,1,"Controls whether the light should respond to visareas."]
			bAmbient = 0, --[0,1,1,"Makes the light behave like an ambient light source, with no point of origin."]
			bFakeLight = 0, --[0,1,1,"Disables light projection, useful for lights which you only want to have Flare effects from."]
			bVolumetricFog = 1, --[0,1,1,"Enables the light to affect volumetric fog."]
			bAffectsVolumetricFogOnly = 0, --[0,1,0,"Enables the light to affect only volumetric fog."]
			fFogRadialLobe = 0, --[0,1,0,"Set the blend ratio of main and side radial lobe for volumetric fog."]
		},
		Shadows = 
		{
			nCastShadows = 0,
			fShadowBias = 1, --[0,1000,1,"Moves the shadow cascade toward or away from the shadow-casting object."]
			fShadowSlopeBias = 1, --[0,1000,1,"Allows you to adjust the gradient (slope-based) bias used to compute the shadow bias."]
			fShadowResolutionScale = 1,
			nShadowMinResPercent = 0, --[0,100,1,"Percentage of the shadow pool the light should use for its shadows."]
			fShadowUpdateMinRadius = 10, --[0,100,0.1,"Define the minimum radius from the light source to the player camera that the ShadowUpdateRatio setting will be ignored."]
			fShadowUpdateRatio = 1, --[0,10,0.01,"Define the update ratio for shadow maps cast from this light."]
		},
		Shape =
		{
			bAreaLight = 0, --[0,1,1,"Used to turn the selected light entity into a Rectangular Area Light."]
			fPlaneWidth = 1, --[0,100,0.1,"Set the width of the Area Light shape."]
			fPlaneHeight = 1, --[0,100,0.1,"Set the height of the Area Light shape."]
		},
	},

	Editor =
	{
		Model="Editor/Objects/Light_Omni.cgf",
		Icon="Light.bmp",
		ShowBounds=0,
		AbsoluteRadius = 1,
		IsScalable = false;
	},

	_LightTable = {},
}

LightSlot = 1

function Light:OnInit()
	--self:NetPresent(0);
	self:SetFlags(ENTITY_FLAG_CLIENT_ONLY, 0);
	self:OnReset();
	self:CacheResources("Light.lua");
end

function Light:CacheResources(requesterName)
	local textureFlags = 0;
end

function Light:OnShutDown()
	self:FreeSlot(LightSlot);
end

function Light:OnLoad(props)
	self:OnReset()
	self:ActivateLight(props.bActive)
end

function Light:OnSave(props)
	props.bActive = self.bActive
end

function Light:OnPropertyChange()
	self:OnReset();
	self:ActivateLight( self.bActive );
	if (self.Properties.Options.bAffectsThisAreaOnly == 1) then
		self:UpdateLightClipBounds(LightSlot);
	end
end

-- Optimization for common animated trackview properties, to avoid fully recreating everything on every animated frame
function Light:OnPropertyAnimated( name )
	local changeTakenCareOf = false;

	if (name=="fDiffuseMultiplier" or name=="fSpecularMultiplier") then
		changeTakenCareOf = true;
		local Color = self.Properties.Color;
		local diffuse_mul = Color.fDiffuseMultiplier;
		local specular_multiplier = Color.fSpecularMultiplier;
		local diffuse_color = { x=Color.clrDiffuse.x*diffuse_mul, y=Color.clrDiffuse.y*diffuse_mul, z=Color.clrDiffuse.z*diffuse_mul };
		self:SetLightColorParams( LightSlot, diffuse_color, specular_multiplier);
	end

	return changeTakenCareOf;
end

function Light:OnSysSpecLightChanged()
	self:OnPropertyChange();
end

function Light:OnLevelLoaded()
	if (self.Properties.Options.bAffectsThisAreaOnly == 1) then
		self:UpdateLightClipBounds(LightSlot);
	end
end

function Light:OnReset()
	if (self.bActive ~= self.Properties.bActive) then
		self:ActivateLight( self.Properties.bActive );
	end
end

function Light:ActivateLight( enable )
	if (enable and enable ~= 0) then
		self.bActive = 1;
		self:LoadLightToSlot(LightSlot);
		self:ActivateOutput( "Active",true );
	else
		self.bActive = 0;
		self:FreeSlot(LightSlot);
		self:ActivateOutput( "Active",false );
	end
end

function Light:LoadLightToSlot( nSlot )
	local props = self.Properties;
	local Style = props.Style;
	local Projector = props.Projector;
	local Color = props.Color;
	local Options = props.Options;
	local Shape = props.Shape;
	local Shadows = props.Shadows;

	local diffuse_mul = Color.fDiffuseMultiplier;
	local specular_mul = Color.fSpecularMultiplier;

	local lt = self._LightTable;

	lt.radius = props.Radius;
	lt.attenuation_bulbsize = props.fAttenuationBulbSize;
	lt.diffuse_color = { x=Color.clrDiffuse.x*diffuse_mul, y=Color.clrDiffuse.y*diffuse_mul, z=Color.clrDiffuse.z*diffuse_mul };
	lt.specular_multiplier = specular_mul;

	lt.this_area_only = Options.bAffectsThisAreaOnly;
	lt.ambient = props.Options.bAmbient;
	lt.fake = Options.bFakeLight;
	lt.ignore_visareas = Options.bIgnoresVisAreas;
	lt.volumetric_fog = Options.bVolumetricFog;
	lt.volumetric_fog_only = Options.bAffectsVolumetricFogOnly;
	lt.fog_radial_lobe = Options.fFogRadialLobe;

	lt.cast_shadow = Shadows.nCastShadows;
	lt.shadow_bias = Shadows.fShadowBias;
	lt.shadow_slope_bias = Shadows.fShadowSlopeBias;
	lt.shadowResolutionScale = Shadows.fShadowResolutionScale;
	lt.shadowMinResolution = Shadows.nShadowMinResPercent;
	lt.shadowUpdate_MinRadius = Shadows.fShadowUpdateMinRadius;
	lt.shadowUpdate_ratio = Shadows.fShadowUpdateRatio;

	lt.projector_texture = Projector.texture_Texture;
	lt.proj_fov = Projector.fProjectorFov;
	lt.proj_nearplane = Projector.fProjectorNearPlane;

	lt.area_light = Shape.bAreaLight;
	lt.area_width = Shape.fPlaneWidth;
	lt.area_height = Shape.fPlaneHeight;

	lt.style = Style.nLightStyle;
	lt.attach_to_sun = Style.bAttachToSun;
	lt.anim_speed = Style.fAnimationSpeed;
	lt.anim_phase = Style.nAnimationPhase;
	lt.light_animation = Style.lightanimation_LightAnimation;
	lt.time_scrubbing_in_trackview = Style.bTimeScrubbingInTrackView;
	lt.time_scrubbed = Style._fTimeScrubbed;
	lt.flare_enable = Style.bFlareEnable;
	lt.flare_Flare = Style.flare_Flare;
	lt.flare_FOV = Style.fFlareFOV;

	lt.lightmap_linear_attenuation = 1;
	lt.is_rectangle_light = 0;
	lt.is_sphere_light = 0;
	lt.area_sample_number = 1;
	lt.indoor_only = 0;

	self:LoadLight( nSlot,lt );
end

function Light:Event_Enable()
	if (self.bActive == 0) then
		self:ActivateLight( 1 );
	end
end

function Light:Event_Disable()
	if (self.bActive == 1) then
		self:ActivateLight( 0 );
	end
end

function Light:NotifySwitchOnOffFromParent(wantOn)
  local wantOff = wantOn~=true;
	if (self.bActive == 1 and wantOff) then
		self:ActivateLight( 0 );
	elseif (self.bActive == 0 and wantOn) then
		self:ActivateLight( 1 );
	end
end

------------------------------------------------------------------------------------------------------
-- Event Handlers
------------------------------------------------------------------------------------------------------
function Light:Event_Active(sender, bActive)
	if (self.bActive == 0 and bActive == true) then
		self:ActivateLight( 1 );
	else
		if (self.bActive == 1 and bActive == false) then
			self:ActivateLight( 0 );
		end
	end
end

------------------------------------------------------------------------------------------------------
-- Event descriptions
------------------------------------------------------------------------------------------------------
Light.FlowEvents =
{
	Inputs =
	{
		Active = { Light.Event_Active,"bool" },
		Enable = { Light.Event_Enable,"bool" },
		Disable = { Light.Event_Disable,"bool" },
	},
	Outputs =
	{
		Active = "bool",
	},
}