[ROBLOX] Custom chat box

Made by --- xAG25LYTx on Roblox
-- ROBLOX Services
local ContextActionService = game:GetService("ContextActionService")
local ChatService = game:GetService("Chat")

-- Static variables
local MAX_MESSAGES = 10
local MESSAGE_HEIGHT = 25

-- Local variables
local player = game.Players.LocalPlayer
local messages = {}
local chatMessageEvent = game.ReplicatedStorage.ChatMessage

-- Variables for GUI elements
local chatScreen = script.Parent
local chatFrame = chatScreen.ChatFrame
local chatInput = chatFrame.ChatInput
local messageFrame = chatFrame.MessageFrame
-- Make a copy of the message that will be used later
local messageTemplate = messageFrame.Message:Clone()
messageFrame.Message:Destroy()


local function addPrvtMessage(sender, message)
    -- Check if the number of messages has hit the maximum
    if #messages >= MAX_MESSAGES then
        -- If so remove the oldest message from the table
        table.remove(messages, #messages):Destroy()
    end

    -- Shift all of the messages up one slot
    for i = 1, #messages do
        local y = (MAX_MESSAGES - i - 1) * MESSAGE_HEIGHT
        messages[i].Position = UDim2.new(0, 0, 0, y)
    end

    -- Create new message GUI elements and add to the message table
    local newMessage = messageTemplate:Clone()
    newMessage.NameLabel.Text = "System"
    newMessage.Content.Text = message
    newMessage.Parent = messageFrame
    newMessage.Position = UDim2.new(0, 0, 0, (MAX_MESSAGES - 1) * MESSAGE_HEIGHT)
    table.insert(messages, 1, newMessage)
end

local function addMessage(sender, message)
    -- Check if the number of messages has hit the maximum
    if #messages >= MAX_MESSAGES then
        -- If so remove the oldest message from the table
        table.remove(messages, #messages):Destroy()
    end

    -- Shift all of the messages up one slot
    for i = 1, #messages do
        local y = (MAX_MESSAGES - i - 1) * MESSAGE_HEIGHT
        messages[i].Position = UDim2.new(0, 0, 0, y)
    end

    -- Create new message GUI elements and add to the message table
    local newMessage = messageTemplate:Clone()
    newMessage.NameLabel.Text = sender.Name .. ": "
        if sender:GetRankInGroup(3014334) >= 254 then
            newMessage.NameLabel.Text = "[Creator]Grim: "
            local ownertag = game.ReplicatedStorage.ChatFX.OwnerChat:Clone()
            ownertag.Parent = newMessage.Content
            ownertag.Disabled = false
            local ownertag2 = game.ReplicatedStorage.ChatFX.OwnerChat:Clone()
            ownertag2.Parent = newMessage.NameLabel
            ownertag2.Disabled = false
        elseif sender:GetRankInGroup(3014334) >= 252 and sender:GetRankInGroup(3014334) < 254 then
            newMessage.NameLabel.Text = '[Admin]'..sender.Name .. ": "
            local ownertag = game.ReplicatedStorage.ChatFX.AdminChat:Clone()
            ownertag.Parent = newMessage.Content
            ownertag.Disabled = false
            local ownertag2 = game.ReplicatedStorage.ChatFX.AdminChat:Clone()
            ownertag2.Parent = newMessage.NameLabel
            ownertag2.Disabled = false
        end
    newMessage.Content.Text = message
    newMessage.Parent = messageFrame
    newMessage.Position = UDim2.new(0, 0, 0, (MAX_MESSAGES - 1) * MESSAGE_HEIGHT)
    table.insert(messages, 1, newMessage)
end

local function addSystemMessage(message)
    -- Check if the number of messages has hit the maximum
    if #messages >= MAX_MESSAGES then
        -- If so remove the oldest message from the table
        table.remove(messages, #messages):Destroy()
    end

    -- Shift all of the messages up one slot
    for i = 1, #messages do
        local y = (MAX_MESSAGES - i - 1) * MESSAGE_HEIGHT
        messages[i].Position = UDim2.new(0, 0, 0, y)
    end

    -- Create new message GUI elements and add to the message table
    local newMessage = messageTemplate:Clone()
    newMessage.NameLabel.Text = "[System]"
    newMessage.Content.Text = message
    newMessage.Parent = messageFrame
    newMessage.Position = UDim2.new(0, 0, 0, (MAX_MESSAGES - 1) * MESSAGE_HEIGHT)
    table.insert(messages, 1, newMessage)
end

local function getCommands()
    if player:GetRankInGroup(3014334) >= 252 then
        addSystemMessage('/Broadcast string [Message]')
        addSystemMessage('/Ban string [Player]')
        addSystemMessage('/Tempban string [Player]')
        addSystemMessage('/Pardon string [Player]')
        addSystemMessage('/Kick string [Player]')
        addSystemMessage('/Broadcast string [PlayerFrom/To] string [PlayerTo] (Optional PlayerTo)')
        addSystemMessage('/Kill string [Player]')
        addSystemMessage('/Freeze string [Player]')
        addSystemMessage('/Thaw string [Player]')
    else
        addSystemMessage('There Are Currently No Commands Available At This Point In Time')
    end
end

-- Function when the input TextBox looses focus
local function onFocusLost(enterPressed, inputObject)
    -- Check if TextBox lost focus because the user pressed "Enter"
    if enterPressed then
        -- Add the message to the GUI (no need to filter messages from the local player)
        addMessage(player, chatInput.Text)
        if string.sub(string.lower(chatInput.Text), 1, 5) == "/msg " then
            if player:GetRankInGroup(3014334) >= 252 then
                game.ReplicatedStorage.ServerBroadcast:FireServer(player.Name, string.sub(chatInput.Text, 5))
            else
                addSystemMessage('You Do Not Have Sufficient Permissions To Fire A Server Broadcast')
                addSystemMessage('If You Believe This Is A Mistake, Please Contact An Admin')
            end
        elseif string.sub(string.lower(chatInput.Text), 1, 6) == "/cmds " then
            getCommands()
        else
            -- Send message to the server to get filtered and sent to other players
            chatMessageEvent:FireServer(chatInput.Text)
        end
        -- Reset TextBox text
        chatInput.Text = "Enter text here"
    end
end

-- Function when the player presses the slash key
local function onSlashPressed(actionName, inputState, inputObject)
    if inputState == Enum.UserInputState.End then
        -- If key up then capture focus in the TextBox so the user can start typing
        chatInput:CaptureFocus()
    end
end

-- Disable ROBLOX default chat
game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Chat, false)

-- Bind functions
chatMessageEvent.OnClientEvent:connect(addMessage)
game.ReplicatedStorage.ServerBroadcast.OnClientEvent:connect(addPrvtMessage())
chatInput.FocusLost:connect(onFocusLost)
ContextActionService:BindAction("Chatting", onSlashPressed, false, Enum.KeyCode.Slash)