local already_warned = false


local function check_dungeon_difficulty()
    if IsInRaid() then return end
    if not IsInGroup() then return end
    if already_warned then return end

    local difficulty_id = GetDungeonDifficultyID()

    -- 23 = Mythic
    if difficulty_id ~= 23 then
        local text = "[Alert]: Dungeon difficulty is currently not set to Mythic."
        print("NSWA: " .. text)
        SendChatMessage(text, "PARTY")
        already_warned = true
    end
end

local function delayed_check()
    C_Timer.After(1, function()
        check_dungeon_difficulty()
    end)
end

local function reset_state()
    already_warned = false
end

local frame = CreateFrame("Frame")

frame:RegisterEvent("GROUP_ROSTER_UPDATE")
frame:RegisterEvent("PLAYER_ENTERING_WORLD")

frame:SetScript("OnEvent", function(self, event)
    if event == "GROUP_ROSTER_UPDATE" then
        if not IsInGroup() then
            reset_state()
        else
            delayed_check()
        end
    elseif event == "PLAYER_ENTERING_WORLD" then
        delayed_check()
    end
end)