-- ==============================================================================
-- Hide UI Lua Script for Honkai: Star Rail (FFGO Method)
-- Press "ฃ" (Backslash '\' on keyboard) to toggle UI visibility
-- Uses /UIRoot/Page CanvasGroup alpha - character rendering stays completely intact!
-- ==============================================================================

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

_G.__HIDE_UI_ENABLED = _G.__HIDE_UI_ENABLED or false
_G.__HIDE_UI_LAST_FRAME = _G.__HIDE_UI_LAST_FRAME or 0

-- Ensure all cameras and canvases are restored if previously disabled
pcall(function()
    local allCams = Camera.allCameras
    if allCams and allCams.Length > 0 then
        for i = 0, allCams.Length - 1 do
            local c = allCams[i]
            if c and (c.name == "UICamera" or string.find(c.name, "UI") or string.find(c.name, "ui")) then
                c.enabled = true
            end
        end
    end
    local canvases = GameObject.FindObjectsOfType(typeof(CS.UnityEngine.Canvas))
    if canvases and canvases.Length > 0 then
        for i = 0, canvases.Length - 1 do
            if canvases[i] then canvases[i].enabled = true end
        end
    end
end)

local function ensure_canvas_and_set_alpha(obj, visible)
    if not obj then return end
    pcall(function()
        local cg = obj:GetComponent(typeof(CanvasGroup))
        if not cg then
            cg = obj:AddComponent(typeof(CanvasGroup))
        end
        if cg then
            cg.alpha = visible and 1.0 or 0.0
            cg.interactable = true
            cg.blocksRaycasts = true
        end
    end)
end

local function set_canvasgroup_visible(obj, visible)
    if not obj then return end
    pcall(function()
        local cg = obj:GetComponent(typeof(CanvasGroup))
        if cg then
            cg.alpha = visible and 1.0 or 0.0
            cg.interactable = true
            cg.blocksRaycasts = true
        end

        for i = 0, obj.transform.childCount - 1 do
            local child = obj.transform:GetChild(i).gameObject
            local childCg = child:GetComponent(typeof(CanvasGroup))
            if childCg then
                childCg.alpha = visible and 1.0 or 0.0
                childCg.interactable = true
                childCg.blocksRaycasts = true
            end
        end
    end)
end

local function set_ui_visible(visible)
    pcall(function()
        local gameUI = GameObject.Find("/UIRoot/Page") or GameObject.Find("UIRoot/Page")
        if gameUI then
            ensure_canvas_and_set_alpha(gameUI, visible)
            local battleGameUI = GameObject.Find("/UIRoot/Page/BattleGamePhaseUI(Clone)") or GameObject.Find("UIRoot/Page/BattleGamePhaseUI(Clone)")
            if battleGameUI then
                ensure_canvas_and_set_alpha(battleGameUI, visible)
                set_canvasgroup_visible(battleGameUI, visible)
            end
        end
    end)
end

function _G.__HIDE_UI_TICK()
    pcall(function()
        local curFrame = Time.frameCount
        if _G.__HIDE_UI_LAST_FRAME == curFrame then
            return
        end

        -- Check physical key 'ฃ' on keyboard (KeyCode.Backslash)
        if Input.GetKeyDown(KeyCode.Backslash) then
            _G.__HIDE_UI_LAST_FRAME = curFrame
            _G.__HIDE_UI_ENABLED = not _G.__HIDE_UI_ENABLED

            set_ui_visible(not _G.__HIDE_UI_ENABLED)

            if _G.__HIDE_UI_ENABLED then
                CS.UnityEngine.Debug.Log("<color=#FF00FF>[UI Toggle]</color> <color=#FF5555>UI Hidden (ซ่อน UI แล้ว)</color>")
            else
                CS.UnityEngine.Debug.Log("<color=#FF00FF>[UI Toggle]</color> <color=#55FF55>UI Restored (แสดง UI ตามปกติ)</color>")
            end
        end

        -- When hidden, keep enforcing /UIRoot/Page visibility
        if _G.__HIDE_UI_ENABLED then
            set_ui_visible(false)
        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> Loaded successfully (FFGO method)! Press 'ฃ' to toggle UI.")
end