-- Camera mod


local Camera = require(cameraModule)

local lastUpCFrame = IDENTITYCF

Camera.UpVector = Vector3.new(0, 1, 0)
Camera.TransitionRate = 0.15
Camera.UpCFrame = IDENTITYCF

function Camera:GetUpVector(oldUpVector)
	return oldUpVector
end

function Camera:CalculateUpCFrame()
	local oldUpVector = self.UpVector
	local newUpVector = self:GetUpVector(oldUpVector)
	
	local backup = game.Workspace.CurrentCamera.CFrame.RightVector
	local transitionCF = getRotationBetween(oldUpVector, newUpVector, backup)
	local vecSlerpCF = IDENTITYCF:Lerp(transitionCF, self.TransitionRate)
	
	self.UpVector = vecSlerpCF * oldUpVector
	self.UpCFrame = vecSlerpCF * self.UpCFrame
	
	lastUpCFrame = self.UpCFrame
end

function Camera:Update(dt)
	if self.activeCameraController then	
		local newCameraCFrame, newCameraFocus = self.activeCameraController:Update(dt)
		self.activeCameraController:ApplyVRTransform()
		
		self:CalculateUpCFrame()
		self.activeCameraController:UpdateUpCFrame(self.UpCFrame)
		
		local offset = newCameraFocus:Inverse() * newCameraCFrame
		newCameraCFrame = newCameraFocus * self.UpCFrame * offset
		
		if (self.activeCameraController.lastCameraTransform) then
			self.activeCameraController.lastCameraTransform = newCameraCFrame
			self.activeCameraController.lastCameraFocus = newCameraFocus
		end
		
		if self.activeOcclusionModule then
			newCameraCFrame, newCameraFocus = self.activeOcclusionModule:Update(dt, newCameraCFrame, newCameraFocus)
		end
		
		game.Workspace.CurrentCamera.CFrame = newCameraCFrame
		game.Workspace.CurrentCamera.Focus = newCameraFocus
		
		if self.activeTransparencyController then
			self.activeTransparencyController:Update()
		end
	end
end
