minetest.register_on_joinplayer(function(player)
    pname = player:get_player_name()
    playerdata = load_player_data()
    if not playerdata[pname] or not playerdata[pname]['gamemode'] then
        playerdata[pname]['gamemode'] = Default_Mode
        save_player_data()
        playerdata = load_player_data()
    else
        -- If in creative mode, modify player's inventory forms
        if not playerdata[pname]['gamemode'] == "Creative" then
        updategamemode(pname)
        end
        updategamemode(pname)
    end
end)
-- Create detached creative inventory after loading all mods
function updategamemode(pname)
    playerdata = load_player_data()
    if playerdata[pname]['gamemode'] == "Creative" then
    local player = minetest.env:get_player_by_name(pname)
    local inv = minetest.create_detached_inventory("creative", {
        allow_move = function(inv, from_list, from_index, to_list, to_index, count, player)
                return count
        end,
        allow_put = function(inv, listname, index, stack, player)
            return 0
        end,
        allow_take = function(inv, listname, index, stack, player)
                return -1
        end,
        on_move = function(inv, from_list, from_index, to_list, to_index, count, player)
        end,
        on_put = function(inv, listname, index, stack, player)
        end,
        on_take = function(inv, listname, index, stack, player)
            print(player:get_player_name().." takes item from creative inventory; listname="..dump(listname)..", index="..dump(index)..", stack="..dump(stack))
            if stack then
                print("stack:get_name()="..dump(stack:get_name())..", stack:get_count()="..dump(stack:get_count()))
            end
        end,
    })
    local creative_list = {}
    for name,def in pairs(minetest.registered_items) do
        if (not def.groups.not_in_creative_inventory or def.groups.not_in_creative_inventory == 0)
                and def.description and def.description ~= "" then
            table.insert(creative_list, name)
        end
    end
    table.sort(creative_list)
    inv:set_size("main", #creative_list)
    for _,itemstring in ipairs(creative_list) do
        inv:add_item("main", ItemStack(itemstring))
    end
    creative_inventory.creative_inventory_size = #creative_list
    print("creative inventory size: "..dump(creative_inventory.creative_inventory_size))
        creative_inventory.set_creative_formspec(player, 1, 1)


    -- Create the trash field
    local trash = minetest.create_detached_inventory("creative_trash", {
        -- Allow the stack to be placed and remove it in on_put()
        -- This allows the creative inventory to restore the stack
        allow_put = function(inv, listname, index, stack, player)
                return stack:get_count()
        end,
        on_put = function(inv, listname, index, stack, player)
            inv:set_stack(listname, index, "")
        end,
    })
    trash:set_size("main", 1)

    else

    local player = minetest.env:get_player_by_name(pname)
    creative_inventory.set_creative_formspec(player, 1, 1)

    end
end
creative_inventory.set_creative_formspec = function(player, start_i, pagenum)
playerdata = load_player_data()
if playerdata[player:get_player_name()]['gamemode'] == "Creative" then
    pagenum = math.floor(pagenum)
    local pagemax = math.floor((creative_inventory.creative_inventory_size-1) / (6*4) + 1)
    player:set_inventory_formspec("size[13,7.5]"..
            --"image[6,0.6;1,2;player.png]"..
            "list[current_player;main;5,3.5;8,4;]"..
            "list[current_player;craft;8,0;3,3;]"..
            "list[current_player;craftpreview;12,1;1,1;]"..
            "list[detached:creative;main;0.3,0.5;4,6;"..tostring(start_i).."]"..
            "label[2.0,6.55;"..tostring(pagenum).."/"..tostring(pagemax).."]"..
            "button[0.3,6.5;1.6,1;creative_prev;<<]"..
            "button[2.7,6.5;1.6,1;creative_next;>>]"..
            "label[5,1.5;Trash:]"..
            "list[detached:creative_trash;main;5,2;1,1;]")
    player:get_inventory():set_width("craft", 3)
        player:get_inventory():set_size("craft", 9)

elseif playerdata[player:get_player_name()]['gamemode'] == "Survival" then
player:set_inventory_formspec("size[8,7.5;]"..
            "image[1,0.6;1,2;player.png]"..
            "list[current_player;main;0,3.5;8,4;]"..
            "list[current_player;craft;4,0.5;2,2;]"..
            "list[current_player;craftpreview;6.5,1;1,1;]")
end
end