--Categorises a model based on the location of the start and end points of the path in the model
function RoomPackager:CategoriseModel(pathModel)
	if pathModel:FindFirstChild("EndParts") then
		return game.ReplicatedStorage.PathModules.Branch
	elseif pathModel.Start.Position.Y < pathModel.End.Position.Y - 5 then
		return game.ReplicatedStorage.PathModules.GoingUp
	elseif pathModel.Start.Position.Y > pathModel.End.Position.Y + 5 then
		return game.ReplicatedStorage.PathModules.GoingDown
	else
		return game.ReplicatedStorage.PathModules.SameHeight
	end
end

local function addBehavioursRecur(model, behaviourFolder)
	local children = model:GetChildren()
	for i = 1, #children do
		if children[i]:isA("BasePart") then
			behaviourFolder:Clone().Parent = children[i]
		else
			addBehavioursRecur(children[i], behaviourFolder)
		end
	end
end

RoomPackager.setUpBehaviours = function(roomModel)
	if roomModel:FindFirstChild("Behaviours") then
		addBehavioursRecur(roomModel, roomModel.Behaviours)
		return
	end
	local children = roomModel:GetChildren()
	for i = 1, #children do
		RoomPackager.setUpBehaviours(children[i])
	end
end

local function processPart(roomModel, part, parts)
	if part.Parent == roomModel then return end
	if part.Name == "End" and roomModel:FindFirstChild("End") then
		local endsModel = Instance.new("Model") --Used for branching the path
		endsModel.Name = "EndParts"
		endsModel.Parent = roomModel
		part.Parent = endsModel
		roomModel:FindFirstChild("End").Parent = endsModel
	elseif part.Name == "End" and roomModel:FindFirstChild("EndParts") then
		part.Parent = roomModel:FindFirstChild("EndParts")
	elseif part.Name == "End" then
		part.Parent = roomModel
	else
		local topLevelParent = closestParentToWorkspace(part, roomModel)
		if topLevelParent ~= nil then
			if topLevelParent:isA("BasePart") then
				local connectedParts = topLevelParent:GetConnectedParts(true)
				for _, connectedPart in pairs(connectedParts) do
					if connectedPart.Name == "End" then
						table.insert(parts, connectedPart)	
					else				
						local conTopLevelParent = closestParentToWorkspace(connectedPart, roomModel)
						if conTopLevelParent and conTopLevelParent ~= topLevelParent then
							conTopLevelParent.Parent = roomModel
						end
					end
				end
			end
			topLevelParent.Parent = roomModel
		end
	end
end

function RoomPackager:PackageRoom(roomBasePlate)
	local roomModel = Instance.new("Model")
	roomModel.Name = "Path"
	roomModel.Parent = game.ReplicatedStorage.PathModules
	
	local regions = self:RegionsFromBasePlate(roomBasePlate)
	
	for i = 1, #regions do
		--Repeatedly finds 100 parts in the region until none are left
		while true do
			local parts = game.Workspace:FindPartsInRegion3(regions[i], nil, 100)
			if #parts == 0 then
				break
			end
			for _, part in pairs(parts) do	
				processPart(roomModel, part, parts)
			end
		end
	end
	
	--Set-up model for use in the path (parts for locating the path are made transparent)
	roomBasePlate.Transparency = 1
	roomBasePlate.Parent = roomModel
	roomModel:FindFirstChild("Start", true).Parent = roomModel
	roomModel:FindFirstChild("Start", true).Transparency = 1
	if roomModel:FindFirstChild("EndParts") then
		local ends = roomModel:FindFirstChild("EndParts"):GetChildren()
		for i = 1, #ends do
			ends[i].Transparency = 1	
		end
	else		
		roomModel.End.Transparency = 1
	end
	roomModel.PrimaryPart = roomBasePlate
	roomModel.Parent = self:CategoriseModel(roomModel)
	RoomPackager.setUpBehaviours(roomModel)
	return roomModel
end

return RoomPackager