-- Dropdowns


function Icon:setDropdown(arrayOfIcons)
	-- Reset any previous icons
	for i, otherIcon in pairs(self.dropdownIcons) do
		otherIcon:leave()
	end
	-- Apply new icons
	if type(arrayOfIcons) == "table" then
		for i, otherIcon in pairs(arrayOfIcons) do
			otherIcon:join(self, "dropdown", true)
		end
	end
	-- Update dropdown
	self:_updateDropdown()
	return self
end

function Icon:_updateDropdown()
	local values = {
		maxIconsBeforeScroll = self:get("dropdownMaxIconsBeforeScroll") or "_NIL",
		minWidth = self:get("dropdownMinWidth") or "_NIL",
		padding = self:get("dropdownListPadding") or "_NIL",
		dropdownAlignment = self:get("dropdownAlignment") or "_NIL",
		iconAlignment = self:get("alignment") or "_NIL",
		scrollBarThickness = self:get("dropdownScrollBarThickness") or "_NIL",
	}
	for k, v in pairs(values) do if v == "_NIL" then return end end
	
	local YPadding = values.padding.Offset
	local dropdownContainer = self.instances.dropdownContainer
	local dropdownFrame = self.instances.dropdownFrame
	local dropdownList = self.instances.dropdownList
	local totalIcons = #self.dropdownIcons

	local lastVisibleIconIndex = (totalIcons > values.maxIconsBeforeScroll and values.maxIconsBeforeScroll) or totalIcons
	local newCanvasSizeY = -YPadding
	local newFrameSizeY = 0
	local newMinWidth = values.minWidth
	table.sort(self.dropdownIcons, function(a,b) return a:get("order") < b:get("order") end)
	for i = 1, totalIcons do
		local otherIcon = self.dropdownIcons[i]
		local _, otherIconSize = otherIcon:get("iconSize", nil, "beforeDropdown")
		local increment = otherIconSize.Y.Offset + YPadding
		if i <= lastVisibleIconIndex then
			newFrameSizeY = newFrameSizeY + increment
		end
		if i == totalIcons then
			newFrameSizeY = newFrameSizeY + increment/4
		end
		newCanvasSizeY = newCanvasSizeY + increment
		local otherIconWidth = otherIconSize.X.Offset --+ 4 + 100 -- the +100 is to allow for notices
		if otherIconWidth > newMinWidth then
			newMinWidth = otherIconWidth
		end
		-- This ensures the dropdown is navigated fully and correctly with a controller
		local prevIcon = (i == 1 and self) or self.dropdownIcons[i-1]
		local nextIcon = self.dropdownIcons[i+1]
		otherIcon.instances.iconButton.NextSelectionUp = prevIcon and prevIcon.instances.iconButton
		otherIcon.instances.iconButton.NextSelectionDown = nextIcon and nextIcon.instances.iconButton
	end

	local finalCanvasSizeY = (lastVisibleIconIndex == totalIcons and 0) or newCanvasSizeY
	self:set("dropdownCanvasSize", UDim2.new(0, 0, 0, finalCanvasSizeY))
	self:set("dropdownSize", UDim2.new(0, (newMinWidth+4)*2, 0, newFrameSizeY))

	-- Set alignment while considering screen bounds
	local dropdownAlignment = values.dropdownAlignment:lower()
	local alignmentDetails = {
		left = {
			AnchorPoint = Vector2.new(0, 0),
			PositionXScale = 0,
			ThicknessMultiplier = 0,
		},
		mid = {
			AnchorPoint = Vector2.new(0.5, 0),
			PositionXScale = 0.5,
			ThicknessMultiplier = 0.5,
		},
		right = {
			AnchorPoint = Vector2.new(0.5, 0),
			PositionXScale = 1,
			FrameAnchorPoint = Vector2.new(0, 0),
			FramePositionXScale = 0,
			ThicknessMultiplier = 1,
		}
	}
	local alignmentDetail = alignmentDetails[dropdownAlignment]
	if not alignmentDetail then
		alignmentDetail = alignmentDetails[values.iconAlignment:lower()]
	end
	dropdownContainer.AnchorPoint = alignmentDetail.AnchorPoint
	dropdownContainer.Position = UDim2.new(alignmentDetail.PositionXScale, 0, 1, YPadding+0)
	local scrollbarThickness = values.scrollBarThickness
	local newThickness = scrollbarThickness * alignmentDetail.ThicknessMultiplier
	local additionalOffset = (dropdownFrame.VerticalScrollBarPosition == Enum.VerticalScrollBarPosition.Right and newThickness) or -newThickness
	dropdownFrame.AnchorPoint = alignmentDetail.FrameAnchorPoint or alignmentDetail.AnchorPoint
	dropdownFrame.Position = UDim2.new(alignmentDetail.FramePositionXScale or alignmentDetail.PositionXScale, additionalOffset, 0, 0)
	self._dropdownCanvasPos = Vector2.new(0, 0)
end

function Icon:_dropdownIgnoreClipping()
	self:_ignoreClipping("dropdown")
end