local CollectionService = game:GetService("CollectionService")

-- A live collection of parts tagged "MapleLeaf" that are direct children of a model tagged "MapleTree"
local mapleLeaves: Collection = CollectionService:CreateCollection("Model.MapleTree > Part.MapleLeaf")

local function sway(leaf: Part, deltaTime: number)
	leaf.CFrame *= CFrame.fromEulerAnglesXYZ(0, math.rad(20) * deltaTime, 0)
end

local function fall(leaf: Part)
	leaf.Anchored = false
end

-- OnAdded fires once for every leaf already matching, then for each new match
function mapleLeaves.OnAdded(leaf: Part)
	leaf.Material = Enum.Material.Neon
end

-- OnRemoved fires when a leaf stops matching (untagged, reparented out of the tree, or destroyed)
function mapleLeaves.OnRemoved(leaf: Part)
	leaf:Destroy()
end

-- RunService alias: Fires once per heartbeat for each leaf in the collection
function mapleLeaves.OnHeartbeat(leaf: Part, deltaTime: number)
	sway(leaf, deltaTime)
end

-- Instance-event wrapper: OnTouched wraps BasePart.Touched
-- Collection members without a Touched event silently ignore this assignment
function mapleLeaves.OnTouched(leaf: Part, other: BasePart)
	fall(leaf)
end

-- Property-changed wrapper: React when a leaf turns brown
function mapleLeaves.OnPropertyChanged.Color(leaf: Part)
	if leaf.Color == Color3.fromRGB(124, 92, 70) then
		fall(leaf)
	end
end

-- Imperatively set every leaf currently in the collection green
mapleLeaves:ForEach(function(leaf: Part)
	leaf.Color = Color3.fromRGB(0, 255, 0)
end)