-- The medium voltage solar array is an assembly of low voltage arrays.
-- The assembly can deliver medium voltage levels and is a 10% less efficient
-- compared to 5 individual low voltage arrays due to losses in the transformer.
-- However medium voltage is supplied.
-- Solar arrays are not able to store large amounts of energy.
-- The MV arrays are used to make high voltage arrays.
minetest.register_node("technic:solar_array_mv", {
	tiles = {"technic_mv_solar_array_top.png", "technic_mv_solar_array_bottom.png", "technic_mv_solar_array_side.png",
		 "technic_mv_solar_array_side.png", "technic_mv_solar_array_side.png", "technic_mv_solar_array_side.png"},
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2},
	sounds = default.node_sound_wood_defaults(),
    	description="MV Solar Array",
	active = false,
	drawtype = "nodebox",
	paramtype = "light",
	is_ground_content = true,	
	node_box = {
			type = "fixed",
			fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
		},
		selection_box = {
			type = "fixed",
			fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
		},
	on_construct = function(pos)
		local meta = minetest.env:get_meta(pos)
		meta:set_float("technic_mv_power_machine", 1)
		meta:set_int("MV_EU_supply", 0)
		meta:set_string("infotext", "MV Solar Array")
	end,
})

minetest.register_craft(
   {
      output = 'technic:solar_array_mv 1',
      recipe = {
	 {'technic:solar_array_lv', 'technic:solar_array_lv','technic:solar_array_lv'},
	 {'technic:solar_array_lv', 'technic:mv_transformer','technic:solar_array_lv'},
	 {'default:steel_ingot',    'technic:mv_cable',      'default:steel_ingot'},
      }
})

minetest.register_abm(
   {nodenames = {"technic:solar_array_mv"},
    interval   = 1,
    chance     = 1,
    action = function(pos, node, active_object_count, active_object_count_wider)
		-- The action here is to make the solar array produce power
		-- Power is dependent on the light level and the height above ground
		-- 130m and above is optimal as it would be above cloud level.
		-- Height gives 1/4 of the effect, light 3/4. Max. effect is 720EU for the array.
		-- There are many ways to cheat by using other light sources like lamps.
		-- As there is no way to determine if light is sunlight that is just a shame.
		-- To take care of some of it solar panels do not work outside daylight hours or if
		-- built below -10m
		local pos1={}
		pos1.y=pos.y+1
		pos1.x=pos.x
		pos1.z=pos.z

		local light = minetest.env:get_node_light(pos1, nil)
		local time_of_day = minetest.env:get_timeofday()
		local meta = minetest.env:get_meta(pos)
		if light == nil then light = 0 end
		-- turn on array only during day time and if sufficient light
		-- I know this is counter intuitive when cheating by using other light sources.
		if light >= 12 and time_of_day>=0.24 and time_of_day<=0.76 and pos.y > -10 then
		   local charge_to_give = math.floor(light*(light*2.4+pos1.y/130*12))
		   if charge_to_give<0   then charge_to_give=0 end
		   if charge_to_give>160 then charge_to_give=160 end
		   meta:set_string("infotext", "Solar Array is active ("..charge_to_give.."EU)")
		   --			meta:set_float("active",1)
		   meta:set_int("MV_EU_supply", charge_to_give)
		else
		   meta:set_string("infotext", "Solar Array is inactive");
		   meta:set_int("MV_EU_supply", 0)
		end
	     end,
 }) 

technic.register_MV_machine ("technic:solar_array_mv","PR")