-- Backslash toggles HUD only. Keep pages, dialogs and UI cameras visible.
local Input = CS.UnityEngine.Input
local KeyCode = CS.UnityEngine.KeyCode
local Time = CS.UnityEngine.Time
local GameObject = CS.UnityEngine.GameObject
local CanvasGroup = CS.UnityEngine.CanvasGroup
local Camera = CS.UnityEngine.Camera

-- Names observed under UIRoot in this Client, plus the existing battle HUD.
-- Never target an ancestor shared by HUD and character/reward dialogs.
local HUD_PATHS = {
    "UIRoot/Page/MazeMainPage(Clone)",
    "UIRoot/Page/BattleGamePhaseUI(Clone)",
    "UIRoot/BelowPage/AdventureWaypointsPage(Clone)",
    "UIRoot/BelowPage/MazeJumpingText(Clone)",
    "UIRoot/BelowPage/MazeMonsterWarningPage(Clone)",
    "UIRoot/AboveDialog/BetaHintDialog(Clone)",
    "VersionText"
}

-- The old script did not record CanvasGroup state. Undo its blanket hide once
-- on live upgrade; a fresh Client session avoids any lost legacy fade state.
if _G.__HIDE_UI_REGISTERED and _G.__HIDE_UI_SCHEMA ~= 2 and _G.__HIDE_UI_ENABLED then
    pcall(function()
        local cams = Camera.allCameras
        for i = 0, cams.Length - 1 do
            local mask = (_G.__ORIG_CAM_MASKS or {})[cams[i]:GetInstanceID()]
            if mask ~= nil then cams[i].cullingMask = mask end
        end
        local function restore(obj)
            if obj then
                local cg = obj:GetComponent(typeof(CanvasGroup))
                if cg then cg.alpha = 1; cg.blocksRaycasts = true; cg.interactable = true end
            end
        end
        local root = GameObject.Find("UIRoot")
        if root then
            restore(root)
            local t = root.transform
            for i = 0, t.childCount - 1 do
                local c = t:GetChild(i); restore(c.gameObject)
                for j = 0, c.childCount - 1 do restore(c:GetChild(j).gameObject) end
            end
        end
        local canvases = GameObject.FindObjectsOfType(typeof(CS.UnityEngine.Canvas))
        for i = 0, canvases.Length - 1 do restore(canvases[i].gameObject) end
    end)
end
_G.__HIDE_UI_SCHEMA = 2
_G.__HIDE_UI_ENABLED = _G.__HIDE_UI_ENABLED or false
_G.__HIDE_UI_TARGETS = _G.__HIDE_UI_TARGETS or {}

local function restore_hud()
    for id, state in pairs(_G.__HIDE_UI_TARGETS) do
        pcall(function()
            if state.group then
                if state.added then
                    CS.UnityEngine.Object.Destroy(state.group)
                else
                    state.group.alpha = state.alpha
                    state.group.blocksRaycasts = state.raycast
                    state.group.interactable = state.interactable
                end
            end
        end)
        _G.__HIDE_UI_TARGETS[id] = nil
    end
end

local function hide_hud()
    for _, path in ipairs(HUD_PATHS) do
        pcall(function()
            local obj = GameObject.Find(path)
            if not obj then return end
            local id = obj:GetInstanceID()
            local state = _G.__HIDE_UI_TARGETS[id]
            if not state then
                local group = obj:GetComponent(typeof(CanvasGroup))
                local added = not group
                if added then group = obj:AddComponent(typeof(CanvasGroup)) end
                state = {group=group, added=added, alpha=group.alpha,
                    raycast=group.blocksRaycasts, interactable=group.interactable}
                _G.__HIDE_UI_TARGETS[id] = state
            end
            state.group.alpha = 0
            state.group.blocksRaycasts = false
            state.group.interactable = false
        end)
    end
end

function _G.__HIDE_UI_TICK()
    pcall(function()
        local frame = Time.frameCount
        if _G.__HIDE_UI_LAST_FRAME == frame then return end
        _G.__HIDE_UI_LAST_FRAME = frame
        local toggled = Input.GetKeyDown(KeyCode.Backslash)
        if toggled then
            _G.__HIDE_UI_ENABLED = not _G.__HIDE_UI_ENABLED
            if not _G.__HIDE_UI_ENABLED then restore_hud() end
        end
        -- Only the small named HUD list is checked, four times a second.
        -- New pages/dialogs never inherit a hidden UIRoot or UI camera.
        if _G.__HIDE_UI_ENABLED then
            local now = Time.unscaledTime
            if toggled or now >= (_G.__HIDE_UI_NEXT_SCAN or 0) then
                _G.__HIDE_UI_NEXT_SCAN = now + 0.25
                hide_hud()
            end
        end
    end)
end

-- Hook into render pipeline
if not _G.__HIDE_UI_REGISTERED then
    _G.__HIDE_UI_REGISTERED = true

    local function hook(target, evt)
        pcall(function() target[evt]('+', function(c) _G.__HIDE_UI_TICK() end) end)
        pcall(function() target[evt] = target[evt] + function(c) _G.__HIDE_UI_TICK() end end)
    end

    hook(Camera, "onPreRender")
    hook(Camera, "onPreCull")
    hook(Camera, "onPostRender")
    pcall(function() CS.UnityEngine.Application.onBeforeRender('+', function() _G.__HIDE_UI_TICK() end) end)
    pcall(function() CS.UnityEngine.Application.onBeforeRender = CS.UnityEngine.Application.onBeforeRender + function() _G.__HIDE_UI_TICK() end end)

    CS.UnityEngine.Debug.Log("<color=#FF00FF>[UI Toggle Script]</color> HUD-only HideUI loaded! Press 'ฃ' to toggle UI.")
end