-- 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)",
    -- Fallback for clients where the phase's private HudPage field is absent
    -- or does not include every battle overlay.
    "UIRoot/Page/BattleGamePhaseUI(Clone)",
    "UIRoot/BelowPage/AdventureWaypointsPage(Clone)",
    "UIRoot/BelowPage/MazeJumpingText(Clone)",
    "UIRoot/BelowPage/MazeMonsterWarningPage(Clone)",
    -- Character controls observed under AvatarMainPage/Root. Keep RankPanel
    -- and dialogs intact so Eidolon illustrations are not hidden with menus.
    "UIRoot/Page/AvatarMainPage(Clone)/Root/AvatarSubMenuPanel_Vertical",
    "UIRoot/Page/AvatarMainPage(Clone)/Root/AvatarDetailPanel",
    "UIRoot/Page/AvatarMainPage(Clone)/Root/AvatarTopListPanel",
    "UIRoot/Page/AvatarMainPage(Clone)/Root/AvatarListPanel",
    "UIRoot/Page/AvatarMainPage(Clone)/Root/BtnClose",
    "UIRoot/Page/AvatarMainPage(Clone)/Root/TopBarArea",
}

-- 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 or 0) < 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_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 protected_name(name)
    local n = string.lower(tostring(name))
    return string.find(n, "uid", 1, true) ~= nil and string.find(n, "guide", 1, true) == nil
        or n == "versiontext" or n == "betahintdialog(clone)"
end

local function hide_object(obj)
    if not obj or protected_name(obj.name) 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

-- Keep UID/branding subtrees visible even if they belong to a HUD container.
local function hide_hud_tree(obj)
    if not obj then return end
    local protected = {}
    local ts = obj:GetComponentsInChildren(typeof(CS.UnityEngine.Transform), true)
    for i = 0, ts.Length - 1 do
        if protected_name(ts[i].name) then
            local t = ts[i]
            while t do
                protected[t:GetInstanceID()] = true
                if t == obj.transform then break end
                t = t.parent
            end
        end
    end
    local function visit(t)
        if protected_name(t.name) then return end
        if not protected[t:GetInstanceID()] then
            hide_object(t.gameObject)
            -- Battle HUD widgets have their own CanvasGroups and some ignore
            -- their parent's alpha. Hide those groups too, preserving each
            -- original state for restoration when the toggle is disabled.
            local groups = t:GetComponentsInChildren(typeof(CanvasGroup), true)
            for i = 0, groups.Length - 1 do
                hide_object(groups[i].gameObject)
            end
            return
        end
        for i = 0, t.childCount - 1 do visit(t:GetChild(i)) end
    end
    visit(obj.transform)
end

-- EX/Eidolon artwork is an image. Hide interactive controls and labels,
-- never the page's Canvas/camera or the illustration's parent container.
local function hide_control_components(root, kind)
    local ok, controls = pcall(function()
        return root:GetComponentsInChildren(kind, true)
    end)
    if not ok or not controls then return end
    for i = 0, controls.Length - 1 do
        local component = controls[i]
        if component and component.gameObject and not protected_name(component.gameObject.name) then
            -- Hiding each control directly avoids rescanning its entire
            -- subtree for every Button/LocalizedText pair on the page.
            hide_object(component.gameObject)
        end
    end
end

local function hide_rank_controls(root)
    if not root or not root.activeInHierarchy then return end
    hide_control_components(root, typeof(CS.RPG.Client.LocalizedText))
    -- Selectable includes buttons, toggles, sliders, dropdowns and scrollbars;
    -- some rank-page controls have no text or Button component of their own.
    hide_control_components(root, typeof(CS.UnityEngine.UI.Selectable))
    -- Skill icons use SkillIcon sprites; illustrations use separate portrait
    -- assets. Do not hide arbitrary images or the illustration container.
    local images = root:GetComponentsInChildren(typeof(CS.UnityEngine.UI.Image), true)
    for i = 0, images.Length - 1 do
        local sprite = images[i].sprite
        if sprite and string.lower(tostring(sprite.name)):find("skillicon",1,true) then
            hide_object(images[i].gameObject)
        end
    end
end

local function hide_hud()
    for _, path in ipairs(HUD_PATHS) do
        pcall(function() hide_hud_tree(GameObject.Find(path)) end)
    end
    local ok, err = pcall(function()
        local flags = CS.System.Enum.ToObject(typeof(CS.System.Reflection.BindingFlags), 60)
        _G.__HIDE_UI_PHASE_FIELD = _G.__HIDE_UI_PHASE_FIELD
            or typeof(CS.RPG.Client.GamePhaseManager):GetField("_CurrentPhase", flags)
        _G.__HIDE_UI_BATTLE_HUD_FIELD = _G.__HIDE_UI_BATTLE_HUD_FIELD
            or typeof(CS.RPG.Client.BattleGamePhase):GetField("_HudPage", flags)
        local manager = CS.RPG.Client.GlobalVars.s_GamePhaseManager
        local phase = manager and _G.__HIDE_UI_PHASE_FIELD:GetValue(manager)
        if phase and typeof(CS.RPG.Client.BattleGamePhase):IsInstanceOfType(phase) then
            local hud = _G.__HIDE_UI_BATTLE_HUD_FIELD:GetValue(phase)
            if hud and hud.Trans then hide_hud_tree(hud.Trans.gameObject) end
            if hud and hud.ChildDialogs then
                local dialogs = hud.ChildDialogs
                for i = 0, dialogs.Count - 1 do
                    if dialogs[i].Trans then hide_hud_tree(dialogs[i].Trans.gameObject) end
                end
            end
        end
    end)
    if not ok and _G.__HIDE_UI_LAST_ERROR ~= tostring(err) then
        _G.__HIDE_UI_LAST_ERROR = tostring(err)
        CS.UnityEngine.Debug.Log("[GaC HideUI] Battle HUD: " .. tostring(err))
    end
    pcall(function()
        local ui = CS.RPG.Client.GlobalVars.s_UIManager
        local pages = ui:GetAllPageNames()
        for i = 0, pages.Count - 1 do
            local name = tostring(pages[i]); local lower = string.lower(name)
            local page = ui:GetPageByName(name)
            if page and page.ChildDialogs then
                for j = 0, page.ChildDialogs.Count - 1 do
                    local dialog = page.ChildDialogs[j]
                    local dialogName = string.lower(tostring(dialog.Name))
                    if dialog.Trans and (dialogName:find("rank",1,true) or dialogName:find("eidolon",1,true)) then
                        hide_rank_controls(dialog.Trans.gameObject)
                    end
                end
            end
            if lower:find("battle",1,true) then
                local page = ui:GetPageByName(name)
                if page and page.Trans and page.Trans.gameObject.activeInHierarchy then
                    hide_hud_tree(page.Trans.gameObject)
                end
            end
            if lower:find("rank",1,true) or lower:find("eidolon",1,true) then
                local page = ui:GetPageByName(name)
                if page and page.Trans then hide_rank_controls(page.Trans.gameObject) end
            end
        end
        hide_rank_controls(GameObject.Find("UIRoot/Page/AvatarMainPage(Clone)/Root/AvatarRankPanel"))
    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
        -- The page/child scan walks Unity UI trees, so keep it to once 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 + 1.0
                hide_hud()
            end
        end
    end)
end

-- Restore targets from the previous policy (including VersionText) on upgrade.
if _G.__HIDE_UI_SCHEMA ~= 5 then
    restore_hud()
    _G.__HIDE_UI_SCHEMA = 5
    _G.__HIDE_UI_NEXT_SCAN = 0
end

-- Use one render callback. Registering all camera events plus before-render
-- made the toggle callback run redundantly several times per frame.
if not _G.__HIDE_UI_REGISTERED then
    local callback = function() _G.__HIDE_UI_TICK() end
    local ok = pcall(function()
        CS.UnityEngine.Application.onBeforeRender('+', callback)
    end)
    if not ok then
        ok = pcall(function()
            CS.UnityEngine.Application.onBeforeRender = CS.UnityEngine.Application.onBeforeRender + callback
        end)
    end
    if not ok then
        ok = pcall(function()
            Camera.onPostRender('+', callback)
        end)
        if not ok then
            ok = pcall(function() Camera.onPostRender = Camera.onPostRender + callback end)
        end
    end
    _G.__HIDE_UI_REGISTERED = ok
    if ok then
        CS.UnityEngine.Debug.Log("<color=#FF00FF>[UI Toggle Script]</color> HUD-only HideUI loaded! Press 'ฃ' to toggle UI.")
    else
        CS.UnityEngine.Debug.Log("[GaC HideUI] Could not register a render callback.")
    end
end