-- Movement mode standardized to Enum.ComputerCameraMovementMode values

function ClassicCamera:SetCameraMovementMode(cameraMovementMode)
	BaseCamera.SetCameraMovementMode(self, cameraMovementMode)

	self.isFollowCamera = cameraMovementMode == Enum.ComputerCameraMovementMode.Follow
	self.isCameraToggle = cameraMovementMode == Enum.ComputerCameraMovementMode.CameraToggle
end

function ClassicCamera:Update()
	local now = tick()
	local timeDelta = now - self.lastUpdate

	local camera = workspace.CurrentCamera
	local newCameraCFrame = camera.CFrame
	local newCameraFocus = camera.Focus

	local overrideCameraLookVector = nil
	if self.resetCameraAngle then
		local rootPart = self:GetHumanoidRootPart()
		if rootPart then
			overrideCameraLookVector = (rootPart.CFrame * INITIAL_CAMERA_ANGLE).lookVector
		else
			overrideCameraLookVector = INITIAL_CAMERA_ANGLE.lookVector
		end
		self.resetCameraAngle = false
	end

	local player = PlayersService.LocalPlayer
	local humanoid = self:GetHumanoid()
	local cameraSubject = camera.CameraSubject
	local isInVehicle = cameraSubject and cameraSubject:IsA("VehicleSeat")
	local isOnASkateboard = cameraSubject and cameraSubject:IsA("SkateboardPlatform")
	local isClimbing = humanoid and humanoid:GetState() == Enum.HumanoidStateType.Climbing

	if self.lastUpdate == nil or timeDelta > 1 then
		self.lastCameraTransform = nil
	end
	
	local rotateInput = CameraInput.getRotation()

	self:StepZoom()

	local cameraHeight = self:GetCameraHeight()

	-- Reset tween speed if user is panning
	if CameraInput.getRotation() ~= Vector2.new() then
		tweenSpeed = 0
		self.lastUserPanCamera = tick()
	end

	local userRecentlyPannedCamera = now - self.lastUserPanCamera < TIME_BEFORE_AUTO_ROTATE
	local subjectPosition = self:GetSubjectPosition()

	if subjectPosition and player and camera then
		local zoom = self:GetCameraToSubjectDistance()
		if zoom < 0.5 then
			zoom = 0.5
		end

		if self:GetIsMouseLocked() and not self:IsInFirstPerson() then
			-- We need to use the right vector of the camera after rotation, not before
			local newLookCFrame = self:CalculateNewLookCFrameFromArg(overrideCameraLookVector, rotateInput)

			local offset = self:GetMouseLockOffset()
			local cameraRelativeOffset = offset.X * newLookCFrame.rightVector + offset.Y * newLookCFrame.upVector + offset.Z * newLookCFrame.lookVector

			--offset can be NAN, NAN, NAN if newLookVector has only y component
			if Util.IsFiniteVector3(cameraRelativeOffset) then
				subjectPosition = subjectPosition + cameraRelativeOffset
			end
		else
			local userPanningTheCamera = CameraInput.getRotation() ~= Vector2.new()

			if not userPanningTheCamera and self.lastCameraTransform then

				local isInFirstPerson = self:IsInFirstPerson()

				if (isInVehicle or isOnASkateboard or (self.isFollowCamera and isClimbing)) and self.lastUpdate and humanoid and humanoid.Torso then
					if isInFirstPerson then
						if self.lastSubjectCFrame and (isInVehicle or isOnASkateboard) and cameraSubject:IsA("BasePart") then
							local y = -Util.GetAngleBetweenXZVectors(self.lastSubjectCFrame.lookVector, cameraSubject.CFrame.lookVector)
							if Util.IsFinite(y) then
								rotateInput = rotateInput + Vector2.new(y, 0)
							end
							tweenSpeed = 0
						end
					elseif not userRecentlyPannedCamera then
						local forwardVector = humanoid.Torso.CFrame.lookVector
						tweenSpeed = math.clamp(tweenSpeed + tweenAcceleration * timeDelta, 0, tweenMaxSpeed)

						local percent = math.clamp(tweenSpeed * timeDelta, 0, 1)
						if self:IsInFirstPerson() and not (self.isFollowCamera and self.isClimbing) then
							percent = 1
						end

						local y = Util.GetAngleBetweenXZVectors(forwardVector, self:GetCameraLookVector())
						if Util.IsFinite(y) and math.abs(y) > 0.0001 then
							rotateInput = rotateInput + Vector2.new(y * percent, 0)
						end
					end

				elseif self.isFollowCamera and (not (isInFirstPerson or userRecentlyPannedCamera) and not VRService.VREnabled) then
					-- Logic that was unique to the old FollowCamera module
					local lastVec = -(self.lastCameraTransform.p - subjectPosition)

					local y = Util.GetAngleBetweenXZVectors(lastVec, self:GetCameraLookVector())

					-- This cutoff is to decide if the humanoid's angle of movement,
					-- relative to the camera's look vector, is enough that
					-- we want the camera to be following them. The point is to provide
					-- a sizable dead zone to allow more precise forward movements.
					local thetaCutoff = 0.4

					-- Check for NaNs
					if Util.IsFinite(y) and math.abs(y) > 0.0001 and math.abs(y) > thetaCutoff * timeDelta then
						rotateInput = rotateInput + Vector2.new(y, 0)
					end
				end
			end
		end

		if not self.isFollowCamera then
			local VREnabled = VRService.VREnabled

			if VREnabled then
				newCameraFocus = self:GetVRFocus(subjectPosition, timeDelta)
			else
				newCameraFocus = CFrame.new(subjectPosition)
			end

			local cameraFocusP = newCameraFocus.p
			if VREnabled and not self:IsInFirstPerson() then
				local vecToSubject = (subjectPosition - camera.CFrame.p)
				local distToSubject = vecToSubject.magnitude

				local flaggedRotateInput = rotateInput

				-- Only move the camera if it exceeded a maximum distance to the subject in VR
				if distToSubject > zoom or flaggedRotateInput.x ~= 0 then
					local desiredDist = math.min(distToSubject, zoom)
					vecToSubject = self:CalculateNewLookVectorFromArg(nil, rotateInput) * desiredDist
					local newPos = cameraFocusP - vecToSubject
					local desiredLookDir = camera.CFrame.lookVector
					if flaggedRotateInput.x ~= 0 then
						desiredLookDir = vecToSubject
					end
					local lookAt = Vector3.new(newPos.x + desiredLookDir.x, newPos.y, newPos.z + desiredLookDir.z)

					newCameraCFrame = CFrame.new(newPos, lookAt) + Vector3.new(0, cameraHeight, 0)
				end
			else
				local newLookVector = self:CalculateNewLookVectorFromArg(overrideCameraLookVector, rotateInput)
				newCameraCFrame = CFrame.new(cameraFocusP - (zoom * newLookVector), cameraFocusP)
			end
		else -- is FollowCamera
			local newLookVector = self:CalculateNewLookVectorFromArg(overrideCameraLookVector, rotateInput)

			if VRService.VREnabled then
				newCameraFocus = self:GetVRFocus(subjectPosition, timeDelta)
			else
				newCameraFocus = CFrame.new(subjectPosition)
			end
			newCameraCFrame = CFrame.new(newCameraFocus.p - (zoom * newLookVector), newCameraFocus.p) + Vector3.new(0, cameraHeight, 0)
		end

		local toggleOffset = self:GetCameraToggleOffset(timeDelta)
		newCameraFocus = newCameraFocus + toggleOffset
		newCameraCFrame = newCameraCFrame + toggleOffset

		self.lastCameraTransform = newCameraCFrame
		self.lastCameraFocus = newCameraFocus
		if (isInVehicle or isOnASkateboard) and cameraSubject:IsA("BasePart") then
			self.lastSubjectCFrame = cameraSubject.CFrame
		else
			self.lastSubjectCFrame = nil
		end
	end

	self.lastUpdate = now
	return newCameraCFrame, newCameraFocus
end

function ClassicCamera:EnterFirstPerson()
	self.inFirstPerson = true
	self:UpdateMouseBehavior()
end

function ClassicCamera:LeaveFirstPerson()
	self.inFirstPerson = false
	self:UpdateMouseBehavior()
end

return ClassicCamera
