airpump_functions.lua

-- common airpump functions

vacuum.has_full_air_bottle = function(inv)
	return inv:contains_item("main", {name="vacuum:air_bottle", count=1})
end

vacuum.has_empty_air_bottle = function(inv)
	return inv:contains_item("main", {name="vessels:steel_bottle", count=1})
end


vacuum.do_empty_bottle = function(inv)
	if not vacuum.has_full_air_bottle(inv) then
		return false
	end

	local new_stack = ItemStack("vessels:steel_bottle")
	inv:remove_item("main", {name="vacuum:air_bottle", count=1})

	if inv:room_for_item("main", new_stack) then
		inv:add_item("main", new_stack)
		return true
	end

	return false
end


vacuum.do_fill_bottle = function(inv)
	if not vacuum.has_empty_air_bottle(inv) then
		return false
	end

	local new_stack = ItemStack("vacuum:air_bottle")
	inv:remove_item("main", {name="vessels:steel_bottle", count=1})

	if inv:room_for_item("main", new_stack) then
		inv:add_item("main", new_stack)
		return true
	end

	return false
end


vacuum.do_repair_spacesuit = function(inv)
	for i = 1, inv:get_size("main") do
		local stack = inv:get_stack("main", i)
		local item_def = minetest.registered_items[stack:get_name()]
		if item_def and item_def.wear_represents == "spacesuit_wear" and stack:get_wear() > 0 then
			stack:set_wear(0)
			inv:set_stack("main", i, stack)
			return true
		end
	end
	return false
end

-- just enabled
vacuum.airpump_enabled = function(meta)
	return meta:get_int("enabled") == 1
end

-- enabled and actively pumping
vacuum.airpump_active = function(meta)
	local inv = meta:get_inventory()
	return vacuum.airpump_enabled(meta) and vacuum.has_full_air_bottle(inv)
end

vacuum.can_flush_airpump = function(pos)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	return inv:contains_item("main", {name="vacuum:air_bottle", count=vacuum.flush_bottle_usage})
end

local c_vacuum = minetest.get_content_id("vacuum:vacuum")
local c_air = minetest.get_content_id("air")

-- flushes the room of the airpump with air
vacuum.flush_airpump = function(pos)
	minetest.sound_play("vacuum_hiss", {pos = pos, gain = 0.5})

	local range = {x=16,y=16,z=16}
	local pos1 = vector.subtract(pos, range)
	local pos2 = vector.add(pos, range)

	local manip = minetest.get_voxel_manip()
	local e1, e2 = manip:read_from_map(pos1, pos2)
	local area = VoxelArea:new({MinEdge=e1, MaxEdge=e2})
	local data = manip:get_data()

	for z=pos1.z, pos2.z do
	for y=pos1.y, pos2.y do
	for x=pos1.x, pos2.x do

		local index = area:index(x, y, z)
		if data[index] == c_vacuum then
			data[index] = c_air
		end

	end
	end
	end

	manip:set_data(data)
	manip:write_to_map()

	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	inv:remove_item("main", {name="vacuum:air_bottle", count=vacuum.flush_bottle_usage})
	inv:add_item("main", ItemStack("vessels:steel_bottle " .. vacuum.flush_bottle_usage))
end