local max_obj_per_mapblock = tonumber(minetest.setting_get("max_objects_per_block"))

-- 
-- * CREATE ALL SPAWNERS NODES *
-- 

function spawners.create(mob_name, mod_prefix, size, offset, mesh, texture, night_only, sound_custom, env)
	
	-- 
	-- DUMMY INSIDE THE SPAWNER
	-- 

	local dummy_definition = {
		hp_max = 1,
		physical = true,
		collisionbox = {0,0,0,0,0,0},
		visual = "mesh",
		visual_size = size,
		mesh = mesh,
		textures = texture,
		makes_footstep_sound = false,
		timer = 0,
		automatic_rotate = math.pi * -3,
		m_name = "dummy"
	}

	dummy_definition.on_activate = function(self)
		self.object:setvelocity({x=0, y=0, z=0})
		self.object:setacceleration({x=0, y=0, z=0})
		self.object:set_armor_groups({immortal=1})
	end

	-- remove dummy after dug up the spawner
	dummy_definition.on_step = function(self, dtime)
		self.timer = self.timer + dtime
		local n = minetest.get_node_or_nil(self.object:getpos())
		if self.timer > 2 then
			if n and n.name and n.name ~= "spawners:"..mod_prefix.."_"..mob_name.."_spawner_active" and n.name ~= "spawners:"..mod_prefix.."_"..mob_name.."_spawner_active_env" then
				self.object:remove()
			end
		end
	end

	minetest.register_entity("spawners:dummy_"..mod_prefix.."_"..mob_name, dummy_definition)

	-- 
	-- * CRAFTING SPAWNERS *
	-- 

	if not env then

		-- print("[Mod][Spawners] Registering Crafting Spawner.")

		-- 
		-- ACTIVE SPAWNER
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_active", {
			description = mod_prefix.."_"..mob_name.." spawner active",
			paramtype = "light",
			light_source = 4,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			damage_per_second = 4,
			sunlight_propagates = true,
			tiles = {
				{
					name = "spawners_spawner_animated.png",
					animation = {
						type = "vertical_frames",
						aspect_w = 32,
						aspect_h = 32,
						length = 2.0
					},
				}
			},
			is_ground_content = true,
			groups = {cracky=1,level=2,igniter=1,not_in_creative_inventory=1},
			drop = "spawners:"..mod_prefix.."_"..mob_name.."_spawner",
			on_construct = function(pos)
				pos.y = pos.y + offset
				minetest.add_entity(pos,"spawners:dummy_"..mod_prefix.."_"..mob_name)
			end,
		})

		-- 
		-- WAITING SPAWNER
		-- 

		-- waiting for light - everything is ok but too much light or not enough light
		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting", {
			description = mod_prefix.."_"..mob_name.." spawner waiting",
			paramtype = "light",
			light_source = 2,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			sunlight_propagates = true,
			tiles = {
				{
					name = "spawners_spawner_waiting_animated.png",
					animation = {
						type = "vertical_frames",
						aspect_w = 32,
						aspect_h = 32,
						length = 2.0
					},
				}
			},
			is_ground_content = true,
			groups = {cracky=1,level=2,not_in_creative_inventory=1},
			drop = "spawners:"..mod_prefix.."_"..mob_name.."_spawner",
		})

		-- 
		-- INACTIVE SPAWNER (DEFAULT)
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner", {
			description = mod_prefix.."_"..mob_name.." spawner",
			paramtype = "light",
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			sunlight_propagates = true,
			tiles = {"spawners_spawner.png"},
			is_ground_content = true,
			groups = {cracky=1,level=2},
			stack_max = 1,
			on_construct = function(pos)
				local random_pos, waiting = spawners.check_node_status(pos, mob_name, night_only)

				if random_pos then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_active"})
				elseif waiting then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting"})
				else
				end
			end,
		})

		-- 
		-- OVERHEATED SPAWNER
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat", {
			description = mod_prefix.."_"..mob_name.." spawner overheated",
			paramtype = "light",
			light_source = 2,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			damage_per_second = 4,
			sunlight_propagates = true,
			tiles = {"spawners_spawner.png^[colorize:#FF000030"},
			is_ground_content = true,
			groups = {cracky=1,level=2,igniter=1,not_in_creative_inventory=1},
			drop = "spawners:"..mod_prefix.."_"..mob_name.."_spawner",
			on_construct = function(pos)
				minetest.get_node_timer(pos):start(60)
			end,
			on_timer = function(pos, elapsed)
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner"})
			end,
		})

	else
		
		-- 
		-- * ENVIRONMENTAL SPAWNERS *
		-- 

		-- minetest.log("action", "[Mod][Spawners] Registering Environmental Spawner.")

		-- 
		-- ACTIVE SPAWNER ENV
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_active_env", {
			description = mod_prefix.."_"..mob_name.." spawner active env",
			paramtype = "light",
			light_source = 4,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			damage_per_second = 4,
			sunlight_propagates = true,
			tiles = {
				{
					name = "spawners_spawner_animated.png",
					animation = {
						type = "vertical_frames",
						aspect_w = 32,
						aspect_h = 32,
						length = 2.0
					},
				}
			},
			is_ground_content = true,
			groups = {cracky=1,level=2,igniter=1,not_in_creative_inventory=1},
			drop = {
				max_items = 1,
				items = {
					{items = {"spawners:"..mod_prefix.."_"..mob_name.."_spawner"}, rarity = 20}
				}
			},
			on_construct = function(pos)
				pos.y = pos.y + offset
				minetest.add_entity(pos,"spawners:dummy_"..mod_prefix.."_"..mob_name)
			end,
		})

		-- 
		-- WAITING SPAWNER ENV
		-- 

		-- waiting for light - everything is ok but too much light or not enough light
		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting_env", {
			description = mod_prefix.."_"..mob_name.." spawner waiting env",
			paramtype = "light",
			light_source = 2,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			sunlight_propagates = true,
			tiles = {
				{
					name = "spawners_spawner_waiting_animated.png",
					animation = {
						type = "vertical_frames",
						aspect_w = 32,
						aspect_h = 32,
						length = 2.0
					},
				}
			},
			is_ground_content = true,
			groups = {cracky=1,level=2,not_in_creative_inventory=1},
			drop = {
				max_items = 1,
				items = {
					{items = {"spawners:"..mod_prefix.."_"..mob_name.."_spawner"}, rarity = 20}
				}
			},
		})

		-- 
		-- INACTIVE SPAWNER (DEFAULT) ENV
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_env", {
			description = mod_prefix.."_"..mob_name.." spawner env",
			paramtype = "light",
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			sunlight_propagates = true,
			tiles = {"spawners_spawner.png"},
			is_ground_content = true,
			groups = {cracky=1,level=2,not_in_creative_inventory=1},
			stack_max = 1,
			drop = {
				max_items = 1,
				items = {
					{items = {"spawners:"..mod_prefix.."_"..mob_name.."_spawner"}, rarity = 20}
				}
			},
			on_construct = function(pos)
				local random_pos, waiting = spawners.check_node_status(pos, mob_name, night_only)

				if random_pos then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_active_env"})
				elseif waiting then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting_env"})
				else
				end
			end,
		})

		-- 
		-- OVERHEATED SPAWNER ENV
		-- 

		minetest.register_node("spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat_env", {
			description = mod_prefix.."_"..mob_name.." spawner overheated env",
			paramtype = "light",
			light_source = 2,
			drawtype = "allfaces",
			walkable = true,
			sounds = default.node_sound_stone_defaults(),
			damage_per_second = 4,
			sunlight_propagates = true,
			tiles = {"spawners_spawner.png^[colorize:#FF000030"},
			is_ground_content = true,
			groups = {cracky=1,level=2,igniter=1,not_in_creative_inventory=1},
			drop = {
				max_items = 1,
				items = {
					{items = {"spawners:"..mod_prefix.."_"..mob_name.."_spawner"}, rarity = 20}
				}
			},
			on_construct = function(pos)
				minetest.get_node_timer(pos):start(60)
			end,
			on_timer = function(pos, elapsed)
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_env"})
			end,
		})
	end

	-- 
	-- * ABM *
	-- 

	minetest.register_abm({
		nodenames = {
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_active",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_env",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_active_env",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat_env",
			"spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting_env"
		},
		neighbors = {"air"},
		interval = 10.0,
		chance = 6,
		catch_up = false,
		action = function(pos, node, active_object_count, active_object_count_wider)

			local random_pos, waiting = spawners.check_node_status(pos, mob_name, night_only)

			-- additional name extention for environmental spawners
			local ext
			local env_ext = string.sub(node.name, string.len(node.name) - 3)
	
			if env_ext and env_ext == "_env" then
				ext = "_env"
			else
				ext = ""
			end

			-- minetest.log("action", "[Mod][Spawners] checking for: "..mob_name.." at "..minetest.pos_to_string(pos))

			if random_pos then

				-- do not spawn if too many active entities in map block and call cooldown
				if active_object_count_wider > max_obj_per_mapblock then

					-- make sure the right node status is shown
					if node.name ~= "spawners:"..mob_name.."_spawner_overheat"..ext then
						minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat"..ext})
					end

					-- extend the timeout if still too many entities in map block
					if node.name == "spawners:"..mod_prefix.."_"..mob_name.."_spawner_overheat"..ext then
						minetest.get_node_timer(pos):stop()
						minetest.get_node_timer(pos):start(60)
					end

					return
				end
				-- make sure the right node status is shown
				if node.name ~= "spawners:"..mod_prefix.."_"..mob_name.."_spawner_active"..ext then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_active"..ext})
				end

				-- enough place to spawn more mobs
				spawners.start_spawning(random_pos, 1, "spawners:"..mob_name, mod_prefix, sound_custom)

			elseif waiting then
				-- waiting status
				if node.name ~= "spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting"..ext then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner_waiting"..ext})
				end
			else
				-- no random_pos found
				if minetest.get_node_timer(pos):is_started() then
					minetest.get_node_timer(pos):stop()
				end

				if node.name ~= "spawners:"..mod_prefix.."_"..mob_name.."_spawner"..ext then
					minetest.set_node(pos, {name="spawners:"..mod_prefix.."_"..mob_name.."_spawner"..ext})
				end
			end

		end
	})

end

-- 
-- CALL 'CREATE' FOR ALL SPAWNERS
-- 

for i, mob_table in ipairs(spawners.mob_tables) do
	if mob_table then

		spawners.create(mob_table.name, mob_table.mod_prefix, mob_table.dummy_size, mob_table.dummy_offset, mob_table.dummy_mesh, mob_table.dummy_texture, mob_table.night_only, mob_table.sound_custom, mob_table.env)
	end
end