local ns = rgt_world

function ns.register_slab(def)
    def = table.copy(def)
    def._variants = nil
    
    rgt.register_node(def._name.."_slab", extend(def, {
        drawtype = "nodebox",
        node_box = {
            type = "fixed",
            fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5}
        },
        paramtype = "light",
        paramtype2 = "facedir"
    }))
end

function ns.update_stair(pos, basename, leaf)
    local node = minetest.get_node(pos)
    local neighbors = {}
    local dir
    local pipe
    
    for _, offset in ipairs(rgt.adjacent_horizontal_neighbor_offests) do
        pipe = minetest.get_node(pos +offset)
        if minetest.get_item_group(pipe.name, basename.."_stair") > 0 then
            neighbors[#neighbors +1] = offset
        end
    end
    
    if #neighbors == 1 then
        node.name = basename.."_stair"
        node.param2 = minetest.dir_to_facedir(-neighbors[1]:rotate(vector.new(0, math.pi /2, 0)))
        minetest.swap_node(pos, node)
    elseif #neighbors > 1 then
        -- Just ue the first two neighbors.
        if neighbors[1].x ~= 0 and neighbors[2].x ~= 0 or neighbors[1].z ~= 0 and neighbors[2].z ~= 0 then
            node.name = basename.."_stair"
            node.param2 = minetest.dir_to_facedir(neighbors[1])
        end
        minetest.swap_node(pos, node)
    end
    
    if not leaf then
        for _, x in ipairs(neighbors) do
            update_pipe(pos +x, true)
        end
    end
end

function ns.register_stair(def)
    def = table.copy(def)
    def._variants = nil
    
    def.groups[def._name.."_stair"] = 1
    
    rgt.register_node(def._name.."_stair", extend(table.copy(def), {
        drawtype = "nodebox",
        node_box = {
            type = "fixed",
            fixed = {{-0.5, -0.5, -0.5, 0.5, 0, 0.5}, {-0.5, -0.5, 0, 0.5, 0.5, 0.5}}
        },
        paramtype = "light",
        paramtype2 = "facedir"
    }))

    rgt.register_node(def._name.."_stair_inner", extend(table.copy(def), {
        drawtype = "nodebox",
        node_box = {
            type = "fixed",
            fixed = {{-0.5, -0.5, -0.5, 0.5, 0, 0.5}, {-0.5, -0.5, 0, 0.5, 0.5, 0.5}, {-0.5, -0.5, -0.5, 0, 0.5, 0.5}}
        },
        paramtype = "light",
        paramtype2 = "facedir"
    }))

    rgt.register_node(def._name.."_stair_outer", extend(def, {
        drawtype = "nodebox",
        node_box = {
            type = "fixed",
            fixed = {{-0.5, -0.5, -0.5, 0.5, 0, 0.5}, {-0.5, -0.5, 0.5, 0, 0.5, 0}}
        },
        paramtype = "light",
        paramtype2 = "facedir"
    }))
end

function ns.register_all(def)
    ns.register_slab(def)
    ns.register_stair(def)
end