Layered Keybind System with Hold Key

-- rebind: min_sdk=0.1.0
-- rebind: name=Layer System
-- rebind: description=Hold a key to access alternate key bindings

local cfg = UI.Schema({
    layer_key = UI.Keybind("LAlt", { label = "Layer Key (Hold to Activate)" }),
    
    -- Layer 1 (base layer)
    layer1_f9 = UI.Keybind("F9", { label = "F9 Base", group = "Layer 1" }),
    layer1_f10 = UI.Keybind("F10", { label = "F10 Base", group = "Layer 1" }),
    layer1_mouse4 = UI.Keybind("Mouse4", { label = "Mouse4 Base", group = "Layer 1" }),
    
    -- Layer 2 (alternate layer)
    layer2_f9 = UI.Keybind("1", { label = "F9 → Layer 2", group = "Layer 2" }),
    layer2_f10 = UI.Keybind("2", { label = "F10 → Layer 2", group = "Layer 2" }),
    layer2_mouse4 = UI.Keybind("3", { label = "Mouse4 → Layer 2", group = "Layer 2" }),
})

local layerActive = false
local keyMapping = {}

-- Define what each key does in each layer
local function setupLayers()
    keyMapping = {
        -- Base layer (layer 1)
        [cfg.layer1_f9] = {
            action = function()
                Log.Info("F9 (base layer)")
                HID.Press("LCtrl+A")
            end,
        },
        [cfg.layer1_f10] = {
            action = function()
                Log.Info("F10 (base layer)")
                HID.Press("LCtrl+C")
            end,
        },
        [cfg.layer1_mouse4] = {
            action = function()
                Log.Info("Mouse4 (base layer)")
                HID.Press("LCtrl+Z")
            end,
        },
        
        -- Alt layer (layer 2)
        [cfg.layer2_f9] = {
            action = function()
                Log.Info("F9 → 1 (alt layer)")
                HID.Type("Layer 2 action A")
            end,
        },
        [cfg.layer2_f10] = {
            action = function()
                Log.Info("F10 → 2 (alt layer)")
                HID.Type("Layer 2 action B")
            end,
        },
        [cfg.layer2_mouse4] = {
            action = function()
                Log.Info("Mouse4 → 3 (alt layer)")
                HID.Type("Layer 2 action C")
            end,
        },
    }
end

function OnStart()
    setupLayers()
    Log.Info("Layer system ready. Hold " .. cfg.layer_key .. " to switch layers.")
end

function OnDown(key)
    -- Detect layer activation
    if key == cfg.layer_key then
        layerActive = true
        UI.Notify("Layer 2 Active", "info")
        return false
    end
    
    -- Base layer: standard keys
    if not layerActive then
        if key == cfg.layer1_f9 then
            keyMapping[cfg.layer1_f9].action()
            return false
        end
        if key == cfg.layer1_f10 then
            keyMapping[cfg.layer1_f10].action()
            return false
        end
        if key == cfg.layer1_mouse4 then
            keyMapping[cfg.layer1_mouse4].action()
            return false
        end
        return true
    end
    
    -- Alt layer: remapped keys
    if layerActive then
        if key == cfg.layer2_f9 then
            keyMapping[cfg.layer2_f9].action()
            return false
        end
        if key == cfg.layer2_f10 then
            keyMapping[cfg.layer2_f10].action()
            return false
        end
        if key == cfg.layer2_mouse4 then
            keyMapping[cfg.layer2_mouse4].action()
            return false
        end
    end
    
    return true
end

function OnUp(key)
    if key == cfg.layer_key then
        layerActive = false
        UI.Notify("Layer 1 Active", "info")
        return false
    end
    return true
end

function OnBlur()
    layerActive = false
end

[cfg.layer1_f9] = {
    action = function()
        Run(function()
            HID.Down("W")
            Sleep(500)
            HID.Up("W")
        end)
    end,
}