local function DenyCommand(errorCode, client)
    local text = {}
    text["DEAD"] = "You need to be alive to use this command."
    text["HEADSET"] = "You need a working headset to use this command."
    text["NOSPEAK"] = "You need to be able to speak to use this command."
    text["SPAM"] = "You need to wait a little bit to use this command again."

    Game.SendDirectChatMessage("", text[errorCode], nil, ChatMessageType.ServerMessageBox, client)
    return true
end

local spamLimit = 0
Hook.Add("chatMessage", "captainAnnounce", function (message, client)
    local split = {}
    for w in string.gmatch(message, "[^%s]+") do
        table.insert(split, w)
    end
    local command = table.remove(split, 1)

    if command ~= "!g" then return end

    if Timer.GetTime() < spamLimit then return DenyCommand("SPAM", client) end

    if client.Character == nil or client.Character.IsDead or not client.Character.IsHuman then
        return DenyCommand("DEAD", client)
    end

    if client.Character.SpeechImpediment > 99 then return DenyCommand("NOSPEAK", client) end

    local headsetSlot = client.Character.Inventory.GetItemInLimbSlot(InvSlotType.Headset)

    if headsetSlot == nil then return DenyCommand("HEADSET", client) end
    local wifiComponent = headsetSlot.GetComponentString("WifiComponent")

    if wifiComponent == nil or not wifiComponent.CanTransmit() then
        return DenyCommand("HEADSET", client)
    end

    local captainMessage = table.concat(split, ' ')
    if captainMessage == nil then return end

    local chatMessage = ChatMessage.Create(client.Name, "Global: " .. captainMessage, ChatMessageType.Private, nil)
    chatMessage.Color = Color(255, 255, 0, 255)

    for key, value in pairs(Client.ClientList) do
        Game.SendDirectChatMessage(chatMessage, value)
    end

    Game.Log(client.Name .. " sent a global message: " .. captainMessage, ServerLogMessageType.Chat)

    spamLimit = Timer.GetTime() + 1

    return true
end)