minetest.register_node("sparktech:solar", {
  description = "Solar Cell",
  tiles = {
    "solar_top.png",
    "solar_side.png"
  },
  drawtype = "nodebox",
  paramtype = "light",
  node_box = {
    type = "fixed",
    fixed = {
      {0.5, -0.1, 0.5, -0.5, -0.5, -0.5}
    }
  },
  groups = {oddly_breakable_by_hand = 1},
  on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
    local meta = minetest.get_meta(pos)
    minetest.chat_send_player(clicker:get_player_name(), meta:get_int("energy"))
  end,
  on_construct = function(pos)
    local meta = minetest.get_meta(pos)
    meta:set_int("energy_out", 20)
    meta:set_int("energy_nobalance", 1)
    meta:set_int("energy_max", 50)
  end
})

minetest.register_abm({
	nodenames = {"sparktech:solar"},
	interval = 1.0,
  chance = 1,
  catch_up = true,
	action = function(pos, node, active_object_count, active_object_count_wider)
    local meta = minetest.get_meta(pos)
    meta:set_int("energy", meta:get_int("energy") + 5)
    if meta:get_int("energy") > meta:get_int("energy_max") then
      meta:set_int("energy", meta:get_int("energy_max"))
    end
	end
})