-- name: [EQUATION] Screen Locker
-- description: Made by BlitherDev. Any second between 30-60 The screen lockes and an random equation will appear,To unlock the screen,somebody has to say the answer in chat to unlock it. It's that easy! This was inspired by a twitch streamer called "DougDoug"

if _G.screen_lock then return end
_G.screen_lock = true

local MIN_SECONDS = 30
local MAX_SECONDS = 60
local FRAME_RATE = 60
local NUM_MIN = 1
local NUM_MAX = 20

local ticks_until_trigger = math.random(MIN_SECONDS, MAX_SECONDS) * FRAME_RATE
local QUIZ_ACTIVE = false
local current_answer = nil
local current_equation = ""
local announce_prefix = "[QUIZ] "

local function randint(a,b) return math.random(a,b) end

local function generate_equation()
    local a = randint(NUM_MIN, NUM_MAX)
    local b = randint(NUM_MIN, NUM_MAX)
    local ops = { "+", "-", "x" }
    local op = ops[randint(1,#ops)]
    local ans = 0
    if op == "+" then ans = a + b
    elseif op == "-" then ans = a - b
    elseif op == "x" then ans = a * b
    end
    return tostring(a) .. " " .. op .. " " .. tostring(b), ans
end

local function announce_in_chat(msg)
    pcall(function() djui_chat_message_create(announce_prefix .. msg) end)
end

hook_event(HOOK_UPDATE, function()
    if QUIZ_ACTIVE then return end
    if ticks_until_trigger > 0 then
        ticks_until_trigger = ticks_until_trigger - 1
        return
    end
    local eq, ans = generate_equation()
    current_equation = eq
    current_answer = ans
    QUIZ_ACTIVE = true
    announce_in_chat("Screen locked! Answer this equation to unlock the screen:")
    announce_in_chat(eq)
end)

hook_event(HOOK_ON_CHAT_MESSAGE, function(m, messageSent)
    if not QUIZ_ACTIVE then return true end
    if not messageSent then return true end
    local msg = messageSent:match("^%s*(.-)%s*$")
    local n = tonumber(msg)
    if n == nil then return true end
    if n == current_answer then
        local pname = "Player"
        pcall(function()
            if m and m.playerIndex and gNetworkPlayers and gNetworkPlayers[m.playerIndex] and gNetworkPlayers[m.playerIndex].name then
                pname = gNetworkPlayers[m.playerIndex].name
            elseif m and m.playerIndex then
                pname = "Player" .. tostring(m.playerIndex)
            end
        end)
        announce_in_chat(pname .. " Answered!")
        QUIZ_ACTIVE = false
        current_answer = nil
        current_equation = ""
        ticks_until_trigger = math.random(MIN_SECONDS, MAX_SECONDS) * FRAME_RATE
        return true
    end
    return true
end)

hook_event(HOOK_ON_HUD_RENDER, function()
    if not QUIZ_ACTIVE then return end
    pcall(function()
        djui_hud_set_resolution(RESOLUTION_DJUI)
        djui_hud_set_font(FONT_ALIASED)
        local w = djui_hud_get_screen_width()
        local h = djui_hud_get_screen_height()
        djui_hud_set_color(0, 0, 0, 255)
        djui_hud_render_rect(0, 0, w, h)
        local title = "Answer this equation to unlock the screen"
        local eq = current_equation or ""
        local titleW = djui_hud_measure_text(title) * 2.0
        local eqW = djui_hud_measure_text(eq) * 2.0
        local centerX = w * 0.5
        local startY = h * 0.4
        djui_hud_set_color(255, 255, 255, 255)
        djui_hud_print_text(title, centerX - (titleW * 0.5), startY, 2.0)
        djui_hud_set_color(255, 255, 160, 255)
        djui_hud_print_text(eq, centerX - (eqW * 0.5), startY + 64, 2.4)
    end)
end)