-- Join or leave a special feature such as a Dropdown or Menu
function Icon:join(parentIcon, featureName, dontUpdate)
	if self._parentIcon then
		self:leave()
	end
	local newFeatureName = (featureName and featureName:lower()) or "dropdown"
	local beforeName = "before"..featureName:sub(1,1):upper()..featureName:sub(2)
	local parentFrame = parentIcon.instances[featureName.."Frame"]
	self.presentOnTopbar = false
	self.joinedFeatureName = featureName
	self._parentIcon = parentIcon
	self.instances.iconContainer.Parent = parentFrame
	for noticeId, noticeDetail in pairs(self.notices) do
		parentIcon:notify(noticeDetail.clearNoticeEvent, noticeId)
		--parentIcon:notify(noticeDetail.completeSignal, noticeId)
	end
	
	if featureName == "dropdown" then
		local squareCorners = parentIcon:get("dropdownSquareCorners")
		self:set("iconSize", UDim2.new(1, 0, 0, self:get("iconSize", "deselected").Y.Offset), "deselected", beforeName)
		self:set("iconSize", UDim2.new(1, 0, 0, self:get("iconSize", "selected").Y.Offset), "selected", beforeName)
		if squareCorners then
			self:set("iconCornerRadius", UDim.new(0, 0), "deselected", beforeName)
			self:set("iconCornerRadius", UDim.new(0, 0), "selected", beforeName)
		end
		self:set("captionBlockerTransparency", 0.4, nil, beforeName)
	end
	local array = parentIcon[newFeatureName.."Icons"]
	table.insert(array, self)
	if not dontUpdate then
		parentIcon:_updateDropdown()
	end
	parentIcon.deselectWhenOtherIconSelected = false
	--
	IconController:_updateSelectionGroup()
	self:_decideToCallSignal("dropdown")
	self:_decideToCallSignal("menu")
	--
	return self
end

function Icon:leave()
	if self._destroyed then return end
	local settingsToReset = {"iconSize", "captionBlockerTransparency", "iconCornerRadius"}
	local parentIcon = self._parentIcon
	self.instances.iconContainer.Parent = topbarContainer
	self.presentOnTopbar = true
	self.joinedFeatureName = nil
	local function scanFeature(t, prevReference, updateMethod)
		for i, otherIcon in pairs(t) do
			if otherIcon == self then
				for _, settingName in pairs(settingsToReset) do
					local states = {"deselected", "selected"}
					for _, toggleState in pairs(states) do
						local currentSetting, previousSetting = self:get(settingName, toggleState, prevReference)
						if previousSetting then
							self:set(settingName, previousSetting, toggleState)
						end
					end
				end
				table.remove(t, i)
				updateMethod(parentIcon)
				if #t == 0 then
					self._parentIcon.deselectWhenOtherIconSelected = true
				end
				break
			end
		end
	end
	scanFeature(parentIcon.dropdownIcons, "beforeDropdown", parentIcon._updateDropdown)
	scanFeature(parentIcon.menuIcons, "beforeMenu", parentIcon._updateMenu)
	--
	for noticeId, noticeDetail in pairs(self.notices) do
		local parentIconNoticeDetail = parentIcon.notices[noticeId]
		if parentIconNoticeDetail then
			parentIconNoticeDetail.completeSignal:Fire()
		end
	end
	--
	self._parentIcon = nil
	--
	IconController:_updateSelectionGroup()
	self:_decideToCallSignal("dropdown")
	self:_decideToCallSignal("menu")
	--
	return self
end

function Icon:_decideToCallSignal(featureName)
	local isOpen = self[featureName.."Open"]
	local previousIsOpenName = "_previous"..string.sub(featureName, 1, 1):upper()..featureName:sub(2).."Open"
	local previousIsOpen = self[previousIsOpenName]
	local totalIcons = #self[featureName.."Icons"]
	if isOpen and totalIcons > 0 and previousIsOpen == false then
		self[previousIsOpenName] = true
		self[featureName.."Opened"]:Fire()
	elseif (not isOpen or totalIcons == 0) and previousIsOpen == true then
		self[previousIsOpenName] = false
		self[featureName.."Closed"]:Fire()
	end
end

function Icon:_ignoreClipping(featureName)
	local ignoreClipping = self:get(featureName.."IgnoreClipping")
	if self._parentIcon then
		local maid = self["_"..featureName.."ClippingMaid"]
		local frame = self.instances[featureName.."Container"]
		maid:clean()
		if ignoreClipping then
			local fakeFrame = Instance.new("Frame")
			fakeFrame.Name = frame.Name.."FakeFrame"
			fakeFrame.ClipsDescendants = true
			fakeFrame.BackgroundTransparency = 1
			fakeFrame.Size = frame.Size
			fakeFrame.Position = frame.Position
			fakeFrame.Parent = activeItems
			--
			for a,b in pairs(frame:GetChildren()) do
				b.Parent = fakeFrame
			end
			--
			local function updateSize()
				local absoluteSize = frame.AbsoluteSize
				fakeFrame.Size = UDim2.new(0, absoluteSize.X, 0, absoluteSize.Y)
			end
			maid:give(frame:GetPropertyChangedSignal("AbsoluteSize"):Connect(function()
				updateSize()
			end))
			updateSize()
			local function updatePos()
				local absolutePosition = frame.absolutePosition
				fakeFrame.Position = UDim2.new(0, absolutePosition.X, 0, absolutePosition.Y+36)
			end
			maid:give(frame:GetPropertyChangedSignal("AbsolutePosition"):Connect(function()
				updatePos()
			end))
			updatePos()
			maid:give(function()
				for a,b in pairs(fakeFrame:GetChildren()) do
					b.Parent = frame
				end
				fakeFrame.Name = "Destroying..."
				fakeFrame:Destroy()
			end)
		end
	end
	self._ignoreClippingChanged:Fire(featureName, ignoreClipping)
end