local dbg
if moddebug then dbg=moddebug.dbg("railcarts") else dbg={v1=function() end,v2=function() end,v3=function() end} end

local railrules = {
    {x = 0, y = -1, z = 0},
    {x = -1, y = 0, z = 0},
    {x = 1, y = 0, z = 0},
    {x = 0, y = 0, z = 1},
    {x = 0, y = 0, z = -1},
    {x = -1, y = -1, z = 0},
    {x = 1, y = -1, z = 0},
    {x = 0, y = -1, z = 1},
    {x = 0, y = -1, z = -1},
}

minetest.register_node(":default:rail", {
    description = "Rail",
    drawtype = "raillike",
    tiles = {"default_rail.png", "default_rail_curved.png", "default_rail_t_junction.png", "default_rail_crossing.png"},
    inventory_image = "default_rail.png",
    wield_image = "default_rail.png",
    paramtype = "light",
    is_ground_content = true,
    walkable = false,
    selection_box = {
        type = "fixed",
        fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
    },
    groups = {bendy=2,snappy=1,dig_immediate=2,attached_node=1,rail=1,connect_to_raillike=1},
    mesecons = {
        effector = {
            rules = railrules,
            action_on =
            function(pos, node)
                node.name = "railcarts:rail_switched"
                minetest.swap_node(pos, node)
                dbg.v2("Rails switched at "..minetest.pos_to_string(pos))
            end
        }
    }
})

minetest.register_node("railcarts:rail_switched", {
    description = "Rail",
    drawtype = "raillike",
    drop = 'default:rail 1',
    tiles = {"default_rail.png", "default_rail_curved.png", "railcarts_rail_t_junction_switched.png", "default_rail_crossing.png"},
    paramtype = "light",
    is_ground_content = true,
    walkable = false,
    selection_box = {
        type = "fixed",
        fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
    },
    groups = {bendy=2,snappy=1,dig_immediate=2,attached_node=1,rail=1,connect_to_raillike=1},
    mesecons = {
        effector = {
            rules = railrules,
            action_off = 
            function(pos, node)
                node.name = "default:rail"
                minetest.swap_node(pos, node)
                dbg.v2("Rails switched back at "..minetest.pos_to_string(pos))
            end
        }
    }
})