--[[ FUNCTIONS ]]

local function lerpLength(msg, min, max)
	return min + (max-min) * math.min(getMessageLength(msg)/75.0, 1.0)
end

local function createFifo()
	local this = {}
	this.data = {}

	local emptyEvent = Instance.new("BindableEvent")
	this.Emptied = emptyEvent.Event

	function this:Size()
		return #this.data
	end

	function this:Empty()
		return this:Size() <= 0
	end

	function this:PopFront()
		table.remove(this.data, 1)
		if this:Empty() then emptyEvent:Fire() end
	end

	function this:Front()
		return this.data[1]
	end

	function this:Get(index)
		return this.data[index]
	end

	function this:PushBack(value)
		table.insert(this.data, value)
	end

	function this:GetData()
		return this.data
	end

	return this
end

local function createCharacterChats()
	local this = {}

	this.Fifo = createFifo()
	this.BillboardGui = nil

	return this
end

local function createMap()
	local this = {}
	this.data = {}
	local count = 0

	function this:Size()
		return count
	end

	function this:Erase(key)
		if this.data[key] then count = count - 1 end
		this.data[key] = nil
	end

	function this:Set(key, value)
		this.data[key] = value
		if value then count = count + 1 end
	end

	function this:Get(key)
		if not key then return end
		if not this.data[key] then
			this.data[key] = createCharacterChats()
			local emptiedCon = nil
			emptiedCon = this.data[key].Fifo.Emptied:connect(function()
				emptiedCon:disconnect()
				this:Erase(key)
			end)
		end
		return this.data[key]
	end

	function this:GetData()
		return this.data
	end

	return this
end

local function createChatLine(message, bubbleColor, isLocalPlayer)
	local this = {}

	function this:ComputeBubbleLifetime(msg, isSelf)
		if isSelf then
			return lerpLength(msg,8,15)
		else
			return lerpLength(msg,12,20)
		end
	end

	this.Origin = nil
	this.RenderBubble = nil
	this.Message = message
	this.BubbleDieDelay = this:ComputeBubbleLifetime(message, isLocalPlayer)
	this.BubbleColor = bubbleColor
	this.IsLocalPlayer = isLocalPlayer

	return this
end

local function createPlayerChatLine(player, message, isLocalPlayer)
	local this = createChatLine(message, BubbleColor.WHITE, isLocalPlayer)

	if player then
		this.User = player.Name
		this.Origin = player.Character
	end

	return this
end

local function createGameChatLine(origin, message, isLocalPlayer, bubbleColor)
	local this = createChatLine(message, bubbleColor, isLocalPlayer)
	this.Origin = origin

	return this
end

function createChatBubbleMain(filePrefix, sliceRect)
	local chatBubbleMain = Instance.new("ImageLabel")
	chatBubbleMain.Name = "ChatBubble"
	chatBubbleMain.ScaleType = Enum.ScaleType.Slice
	chatBubbleMain.SliceCenter = sliceRect
	chatBubbleMain.Image = "rbxasset://textures/" .. tostring(filePrefix) .. ".png"
	chatBubbleMain.BackgroundTransparency = 1
	chatBubbleMain.BorderSizePixel = 0
	chatBubbleMain.Size = UDim2.new(1.0, 0, 1.0, 0)
	chatBubbleMain.Position = UDim2.new(0,0,0,0)

	return chatBubbleMain
end

function createChatBubbleTail(position, size)
	local chatBubbleTail = Instance.new("ImageLabel")
	chatBubbleTail.Name = "ChatBubbleTail"
	chatBubbleTail.Image = "rbxasset://textures/ui/dialog_tail.png"
	chatBubbleTail.BackgroundTransparency = 1
	chatBubbleTail.BorderSizePixel = 0
	chatBubbleTail.Position = position
	chatBubbleTail.Size = size

	return chatBubbleTail
end

function createChatBubbleWithTail(filePrefix, position, size, sliceRect)
	local chatBubbleMain = createChatBubbleMain(filePrefix, sliceRect)

	local chatBubbleTail = createChatBubbleTail(position, size)
	chatBubbleTail.Parent = chatBubbleMain

	return chatBubbleMain
end

function createScaledChatBubbleWithTail(filePrefix, frameScaleSize, position, sliceRect)
	local chatBubbleMain = createChatBubbleMain(filePrefix, sliceRect)

	local frame = Instance.new("Frame")
	frame.Name = "ChatBubbleTailFrame"
	frame.BackgroundTransparency = 1
	frame.SizeConstraint = Enum.SizeConstraint.RelativeXX
	frame.Position = UDim2.new(0.5, 0, 1, 0)
	frame.Size = UDim2.new(frameScaleSize, 0, frameScaleSize, 0)
	frame.Parent = chatBubbleMain

	local chatBubbleTail = createChatBubbleTail(position, UDim2.new(1,0,0.5,0))
	chatBubbleTail.Parent = frame

	return chatBubbleMain
end

function createChatImposter(filePrefix, dotDotDot, yOffset)
	local result = Instance.new("ImageLabel")
	result.Name = "DialogPlaceholder"
	result.Image = "rbxasset://textures/" .. tostring(filePrefix) .. ".png"
	result.BackgroundTransparency = 1
	result.BorderSizePixel = 0
	result.Position = UDim2.new(0, 0, -1.25, 0)
	result.Size = UDim2.new(1, 0, 1, 0)

	local image = Instance.new("ImageLabel")
	image.Name = "DotDotDot"
	image.Image = "rbxasset://textures/" .. tostring(dotDotDot) .. ".png"
	image.BackgroundTransparency = 1
	image.BorderSizePixel = 0
	image.Position = UDim2.new(0.001, 0, yOffset, 0)
	image.Size = UDim2.new(1, 0, 0.7, 0)
	image.Parent = result

	return result
end


local this = {}
this.ChatBubble = {}
this.ChatBubbleWithTail = {}
this.ScalingChatBubbleWithTail = {}
this.CharacterSortedMsg = createMap()