while not game do
	wait()
end

local ChangeHistoryService = game:GetService "ChangeHistoryService"
local CoreGui = game:GetService "CoreGui"

local CreateStandardLabel = require "../Modules/Terrain/CreateStandardLabel"
local New = require("../Modules/New").New

-----------------
--DEFAULT VALUES-
-----------------
local loaded = false
-- True if the plugin is on, false if not.
local on = false

local On, Off

---------------
--PLUGIN SETUP-
---------------
local plugin = PluginManager():CreatePlugin()
local mouse = plugin:GetMouse()

local toolbar = plugin:CreateToolbar "Terrain"
local toolbarbutton =
	toolbar:CreateButton("Remover", "Remover", "destroyer.png")
toolbarbutton.Click:connect(function()
	if on then
		Off()
	elseif loaded then
		On()
	end
end)

game:WaitForChild "Workspace"
workspace:WaitForChild "Terrain"

local c = workspace.Terrain
local SetCell = c.SetCell
local GetCell = c.GetCell
local WorldToCellPreferSolid = c.WorldToCellPreferSolid
local CellCenterToWorld = c.CellCenterToWorld
local AutoWedge = c.AutowedgeCells

-- What color to use for the mouse highlighter.
local mouseHighlightColor = BrickColor.new "Really red"

-- Used to create a highlighter that follows the mouse.
-- It is a class mouse highlighter.  To use, call MouseHighlighter.Create(mouse) where mouse is the mouse to track.
local MouseHighlighter = {}
MouseHighlighter.__index = MouseHighlighter

-- Create a mouse movement highlighter.
-- plugin - Plugin to get the mouse from.
function MouseHighlighter.Create(mouseUse)
	local highlighter = {}

	local mouse2 = mouseUse
	highlighter.OnClicked = nil
	highlighter.mouseDown = false

	-- Store the last point used to draw.
	highlighter.lastUsedPoint = nil

	-- Will hold a part the highlighter will be attached to.  This will be moved where the mouse is.
	highlighter.selectionPart = nil

	-- Create the part that the highlighter will be attached to.
	highlighter.selectionPart = New "Part" {
		Name = "SelectionPart",
		Archivable = false,
		Transparency = 1,
		Anchored = true,
		Locked = true,
		CanCollide = false,
		FormFactor = Enum.FormFactor.Custom,
	}

	highlighter.selectionBox = New "SelectionBox" {
		Archivable = false,
		Color = mouseHighlightColor,
		Adornee = highlighter.selectionPart,
	}
	mouse2.TargetFilter = highlighter.selectionPart
	setmetatable(highlighter, MouseHighlighter)

	-- Update where the highlighter is displayed.
	-- position - Where to display the highlighter, in world space.
	function UpdatePosition(position)
		if not position then
			return
		end

		if not mouse2.Target then
			highlighter.selectionBox.Parent = nil
			return
		end

		-- NOTE:
		-- Change this gui to be the one you want to use.
		highlighter.selectionBox.Parent = CoreGui

		local vectorPos = Vector3.new(position.x, position.y, position.z)
		local cellPos = WorldToCellPreferSolid(c, vectorPos)

		local regionToSelect

		local lowVec = CellCenterToWorld(c, cellPos.x, cellPos.y - 1, cellPos.z)
		local highVec =
			CellCenterToWorld(c, cellPos.x, cellPos.y + 1, cellPos.z)
		regionToSelect = Region3.new(lowVec, highVec)

		highlighter.selectionPart.Size = regionToSelect.Size
			- Vector3.new(-4, 4, -4)
		highlighter.selectionPart.CFrame = regionToSelect.CFrame

		if not (highlighter.OnClicked and highlighter.mouseDown) then
			return
		elseif not highlighter.lastUsedPoint then
			highlighter.lastUsedPoint = WorldToCellPreferSolid(
				c,
				Vector3.new(mouse2.Hit.x, mouse2.Hit.y, mouse2.Hit.z)
			)
		else
			cellPos = WorldToCellPreferSolid(
				c,
				Vector3.new(mouse2.Hit.x, mouse2.Hit.y, mouse2.Hit.z)
			)

			-- holdChange = cellPos - highlighter.lastUsedPoint -- ?

			-- Require terrain.
			if 0 == GetCell(c, cellPos.X, cellPos.Y, cellPos.Z).Value then
				return
			else
				highlighter.lastUsedPoint = cellPos
			end
		end
	end

	-- Function to call when the mouse has moved.  Updates where to display the highlighter.
	local function MouseMoved()
		if on then
			UpdatePosition(mouse2.Hit)
		end
	end

	-- Hook the mouse up to check for movement.
	mouse2.Move:connect(function()
		MouseMoved()
	end)

	mouse2.Button1Down:connect(function()
		highlighter.mouseDown = true
	end)
	mouse2.Button1Up:connect(function()
		highlighter.mouseDown = false
	end)

	return highlighter
end

-- Hide the highlighter.
function MouseHighlighter:DisablePreview()
	self.selectionBox.Parent = nil
end

-- Show the highlighter.
function MouseHighlighter:EnablePreview()
	self.selectionBox.Parent = CoreGui -- This will make it not show up in workspace.
end

-- Create the mouse movement highlighter.
local mouseHighlighter = MouseHighlighter.Create(mouse)

------
--GUI-
------
--screengui
local g = New "ScreenGui" {
	Name = "RemoverGui",
	Parent = CoreGui,
}

-- UI gui load.  Required for sliders.
local RbxGui = LoadLibrary "RbxGui"

-- Store properties here.
local properties = { autoWedgeEnabled = false }

-- Gui frame for the plugin.
local removerPropertiesDragBar, removerFrame, removerHelpFrame, removerCloseEvent =
	RbxGui.CreatePluginFrame(
		"Remover",
		UDim2.new(0, 143, 0, 40),
		UDim2.new(0, 0, 0, 0),
		false,
		g
	)
removerPropertiesDragBar.Visible = false
removerCloseEvent.Event:connect(function()
	Off()
end)

removerHelpFrame.Size = UDim2.new(0, 160, 0, 60)

local helpText = [[
Clicking terrain removes a single block at the location clicked (shown with red highlight).]]

New "TextLabel" {
	Name = "HelpText",
	Font = Enum.Font.ArialBold,
	FontSize = Enum.FontSize.Size12,
	TextColor3 = Color3.new(227 / 255, 227 / 255, 227 / 255),
	TextXAlignment = Enum.TextXAlignment.Left,
	TextYAlignment = Enum.TextYAlignment.Top,
	Position = UDim2.new(0, 4, 0, 4),
	Size = UDim2.new(1, -8, 0, 177),
	BackgroundTransparency = 1,
	TextWrapped = true,
	Text = helpText,
	Parent = removerHelpFrame,
}

CreateStandardLabel(
	"removeText",
	UDim2.new(0, 8, 0, 10),
	UDim2.new(0, 67, 0, 14),
	"Click to remove terrain",
	removerFrame
)

-- Function to connect to the mouse button 1 down event.  This is what will run when the user clicks.
-- mouse 	- Mouse data.
local function onClicked()
	if not on then
		return
	end
	local cellPos = WorldToCellPreferSolid(
		c,
		Vector3.new(mouse.Hit.x, mouse.Hit.y, mouse.Hit.z)
	)
	local x = cellPos.x
	local y = cellPos.y
	local z = cellPos.z

	SetCell(c, x, y, z, 0, 0, 0)

	-- Mark undo point.
	ChangeHistoryService:SetWaypoint "Remover"

	UpdatePosition(mouse.Hit)

	if properties.autoWedgeEnabled then
		AutoWedge(
			c,
			Region3int16.new(
				Vector3int16.new(x - 1, y - 1, z - 1),
				Vector3int16.new(x + 1, y + 1, z + 1)
			)
		)
	end
end

mouse.Button1Down:connect(onClicked)

mouseHighlighter.OnClicked = onClicked

-- Run when the popup is activated.
function On()
	if not c then
		return
	elseif plugin then
		plugin:Activate(true)
	end
	if toolbarbutton then
		toolbarbutton:SetActive(true)
	end
	if removerPropertiesDragBar then
		removerPropertiesDragBar.Visible = true
	end
	on = true
end

-- Run when the popup is deactivated.
function Off()
	on = false

	if toolbarbutton then
		toolbarbutton:SetActive(false)
	end

	-- Hide the popup gui.
	if removerPropertiesDragBar then
		removerPropertiesDragBar.Visible = false
	end
	if mouseHighlighter then
		mouseHighlighter:DisablePreview()
	end
end

plugin.Deactivation:connect(function()
	Off()
end)

loaded = true