local P = game:GetService("Players")
local R = game:GetService("ReplicatedStorage")
local T = game:GetService("TextChatService")
local LP = P.LocalPlayer
local PG = LP:WaitForChild("PlayerGui")

if PG:FindFirstChild("DQuiz") then PG.DQuiz:Destroy() end

local SG = Instance.new("ScreenGui")
SG.Name = "DQuiz"
SG.Parent = PG
SG.ResetOnSpawn = false

local F = Instance.new("Frame")
F.Parent = SG
F.BackgroundColor3 = Color3.fromRGB(30,30,35)
F.Position = UDim2.new(0.1, 0, 0.2, 0)
F.Size = UDim2.new(0, 220, 0, 140)
F.Active = true
F.Draggable = true

local C1 = Instance.new("UICorner")
C1.CornerRadius = UDim.new(0, 12)
C1.Parent = F

local TL = Instance.new("TextLabel")
TL.Parent = F
TL.BackgroundTransparency = 1
TL.Size = UDim2.new(1, 0, 0, 35)
TL.Font = Enum.Font.GothamBold
TL.Text = "Delta Trivia Bot"
TL.TextColor3 = Color3.fromRGB(255, 255, 255)
TL.TextSize = 16

local SL = Instance.new("TextLabel")
SL.Parent = F
SL.BackgroundTransparency = 1
SL.Position = UDim2.new(0, 0, 0, 35)
SL.Size = UDim2.new(1, 0, 0, 25)
SL.Font = Enum.Font.Gotham
SL.Text = "System Idle"
SL.TextColor3 = Color3.fromRGB(180, 180, 180)
SL.TextSize = 12

local B = Instance.new("TextButton")
B.Parent = F
B.BackgroundColor3 = Color3.fromRGB(220, 50, 50)
B.Position = UDim2.new(0.1, 0, 0.55, 0)
B.Size = UDim2.new(0.8, 0, 0, 45)
B.Font = Enum.Font.Gotham
B.Text = "Quiz: OFF"
B.TextColor3 = Color3.fromRGB(255, 255, 255)
B.TextSize = 14

local C2 = Instance.new("UICorner")
C2.CornerRadius = UDim.new(0, 8)
C2.Parent = B

local quizEnabled = false
local currentQuestion = nil
local currentSectorIndex = 1
local usedInCurrentSector = {}
local connections = {}

local sectors = {
    {
        N = "HISTORY",
        Q = {
            {Q = "Which long river was vital to ancient Egypt?", A = "nile"},
            {Q = "Who was the first president of the United States?", A = "washington"},
            {Q = "Which ancient empire built the Colosseum?", A = "roman"},
            {Q = "What famous wall in Germany fell down near the end of the eighties?", A = "berlin"}
        }
    },
    {
        N = "GEOGRAPHY",
        Q = {
            {Q = "What is the capital city of Australia?", A = "canberra"},
            {Q = "Which ocean is the deepest on Earth?", A = "pacific"},
            {Q = "What is the largest country by land mass?", A = "russia"},
            {Q = "What country has the capital city named Paris?", A = "france"}
        }
    },
    {
        N = "SCIENCE",
        Q = {
            {Q = "Which element has the atomic symbol Au?", A = "gold"},
            {Q = "Which planet is the hottest in our solar system?", A = "venus"},
            {Q = "What is the closest star to Earth?", A = "sun"},
            {Q = "What force keeps humans pulled down to the ground?", A = "gravity"}
        }
    }
}

local function send(txt)
    if T.ChatVersion == Enum.ChatVersion.TextChatService then
        local c = T:FindFirstChild("TextChannels") and T.TextChannels:FindFirstChild("RBXGeneral")
        if c then c:SendAsync(txt) end
    else
        local r = R:FindFirstChild("DefaultChatSystemChatEvents") and R.DefaultChatSystemChatEvents:FindFirstChild("SayMessageRequest")
        if r then r:FireServer(txt, "All") end
    end
end

local function hook(p)
    if p == LP then return end
    connections[p] = p.Chatted:Connect(function(m)
        if not quizEnabled or not currentQuestion then return end
        if string.find(string.lower(m), string.lower(currentQuestion.A)) then
            local ans = currentQuestion.A
            currentQuestion = nil
            send("Yes " .. p.Name .. "! The answer was " .. string.upper(ans) .. ".")
        end
    end)
end

for _, p in ipairs(P:GetPlayers()) do hook(p) end
P.PlayerAdded:Connect(hook)
P.PlayerRemoving:Connect(function(p)
    if connections[p] then
        connections[p]:Disconnect()
        connections[p] = nil
    end
end)

B.MouseButton1Click:Connect(function()
    quizEnabled = not quizEnabled
    if quizEnabled then
        B.Text = "Quiz: ON"
        B.BackgroundColor3 = Color3.fromRGB(50, 180, 50)
    else
        B.Text = "Quiz: OFF"
        B.BackgroundColor3 = Color3.fromRGB(220, 50, 50)
        currentQuestion = nil
        SL.Text = "System Idle"
    end
end)

task.spawn(function()
    while true do
        task.wait(1)
        if quizEnabled and not currentQuestion then
            local sec = sectors[currentSectorIndex]
            
            if #usedInCurrentSector >= #sec.Q then
                usedInCurrentSector = {}
                currentSectorIndex = currentSectorIndex + 1
                if currentSectorIndex > #sectors then currentSectorIndex = 1 end
                sec = sectors[currentSectorIndex]
                send("[SYSTEM] Shifting to Sector: " .. sec.N)
                task.wait(3)
            end
            
            local avail = {}
            for _, q in ipairs(sec.Q) do
                local u = false
                for _, v in ipairs(usedInCurrentSector) do
                    if v.Q == q.Q then u = true break end
                end
                if not u then table.insert(avail, q) end
            end
            
            if #avail > 0 then
                currentQuestion = avail[math.random(1, #avail)]
                table.insert(usedInCurrentSector, currentQuestion)
                SL.Text = sec.N .. " Sector"
                send("[" .. sec.N .. "] QUIZ: " .. currentQuestion.Q)
                
                local t = 25
                while t > 0 and currentQuestion and quizEnabled do
                    task.wait(1)
                    t = t - 1
                    SL.Text = "Time Left: " .. t .. "s"
                end
                
                if currentQuestion and quizEnabled then
                    send("Time out! The correct answer was: " .. string.upper(currentQuestion.A))
                    currentQuestion = nil
                end
            end
        end
    end
end)