New MV Hydro Machine (#412)

* New MV hydro with upgraded power

The LV hydro is easy to make giving lot of power. The New hydro MV will put a tier system to it; thereby giving more incentive to player to pursue MV hydro plus a little survival aspect. This is a result of [Detailed discussion which is here](https://github.com/minetest-mods/technic/issues/411). Thanks to VanessaE for a good talk and support and enthusiasm to make one :) This will now produce around 175 EU (in between 150-200, so basically average). The MV hydro will give 10x more power than this one. :)

6 files changed, 110 insertions, 6 deletions

diff --git a/technic/machines/LV/water_mill.lua b/technic/machines/LV/water_mill.lua
index 5d871f0..33834ec 100644
--- a/technic/machines/LV/water_mill.lua
+++ b/technic/machines/LV/water_mill.lua
@@ -1,6 +1,6 @@
 -- A water mill produces LV EUs by exploiting flowing water across it
--- It is a LV EU supplyer and fairly low yield (max 120EUs)
--- It is a little under half as good as the thermal generator.
+-- It is a LV EU supplyer and fairly low yield (max 180EUs)
+-- It is a little over half as good as the thermal generator.
 
 local S = technic.getter
 
@@ -29,11 +29,9 @@ end
 local run = function(pos, node)
 	local meta             = minetest.get_meta(pos)
 	local water_flow       = 0
-	local lava_nodes       = 0
 	local production_level = 0
 	local eu_supply        = 0
-	local max_output       = 35 * 45 -- four param2's at 15 makes 60, cap it lower for "overload protection"
-									 -- (plus we want the gen to report 100% if three sides have full flow)
+	local max_output       = 4 * 45 -- keeping it around 180, little more than previous 150 :)
 
 	local positions = {
 		{x=pos.x+1, y=pos.y, z=pos.z},
@@ -49,7 +47,7 @@ local run = function(pos, node)
 		end
 	end
 
-	eu_supply = math.min(35 * water_flow, max_output)
+	eu_supply = math.min(4 * water_flow, max_output)
 	production_level = math.floor(100 * eu_supply / max_output)
 
 	meta:set_int("LV_EU_supply", eu_supply)
diff --git a/technic/machines/MV/hydro_turbine.lua b/technic/machines/MV/hydro_turbine.lua
new file mode 100644
index 0000000..36aac91
--- /dev/null
+++ b/technic/machines/MV/hydro_turbine.lua
@@ -0,0 +1,105 @@
+-- A Hydro Turbine produces MV EUs by exploiting flowing water across it
+-- It is a MV EU supplyer and fairly high yield (max 1800EUs)
+
+local S = technic.getter
+
+local cable_entry = "^technic_cable_connection_overlay.png"
+
+minetest.register_alias("hydro_turbine", "technic:hydro_turbine")
+
+minetest.register_craft({
+	output = 'technic:hydro_turbine',
+	recipe = {
+		{'technic:stainless_steel_ingot', 'technic:water_mill', 'technic:stainless_steel_ingot'},
+		{'technic:water_mill', 'technic:mv_transformer', 'technic:water_mill'},
+		{'technic:stainless_steel_ingot', 'technic:mv_cable', 'technic:stainless_steel_ingot'},
+	}
+})
+
+local function get_water_flow(pos)
+	local node = minetest.get_node(pos)
+	if minetest.get_item_group(node.name, "water") == 3 then
+		return node.param2 -- returns approx. water flow, if any
+	end
+	return 0
+end
+
+---
+-- 10 times better than LV hydro because of 2 extra water mills and 4 stainless steel, a transformer and whatnot ;P. 
+-- Man hydro turbines are tough and long lasting. So, give it some value :)
+local run = function(pos, node)
+	local meta             = minetest.get_meta(pos)
+	local water_flow       = 0
+	local production_level = 0
+	local eu_supply        = 0
+	local max_output       = 40 * 45 -- Generates 1800EU/s
+
+	local positions = {
+		{x=pos.x+1, y=pos.y, z=pos.z},
+		{x=pos.x-1, y=pos.y, z=pos.z},
+		{x=pos.x,   y=pos.y, z=pos.z+1},
+		{x=pos.x,   y=pos.y, z=pos.z-1},
+	}
+
+	for _, p in pairs(positions) do
+		water_flow = water_flow + get_water_flow(p)
+	end
+
+	eu_supply = math.min(40 * water_flow, max_output)
+	production_level = math.floor(100 * eu_supply / max_output)
+
+	meta:set_int("MV_EU_supply", eu_supply)
+
+	meta:set_string("infotext",
+	S("Hydro %s Generator"):format("MV").." ("..production_level.."%)")
+	if production_level > 0 and
+		minetest.get_node(pos).name == "technic:hydro_turbine" then
+		technic.swap_node(pos, "technic:hydro_turbine_active")
+		meta:set_int("MV_EU_supply", 0)
+		return
+	end
+	if production_level == 0 then
+		technic.swap_node(pos, "technic:hydro_turbine")
+	end
+end
+
+minetest.register_node("technic:hydro_turbine", {
+	description = S("Hydro %s Generator"):format("MV"),
+	tiles = {
+		"technic_hydro_turbine_top.png",
+		"technic_machine_bottom.png"..cable_entry,
+		"technic_hydro_turbine_side.png",
+		"technic_hydro_turbine_side.png",
+		"technic_hydro_turbine_side.png",
+		"technic_hydro_turbine_side.png"
+	},
+	paramtype2 = "facedir",
+	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
+	technic_machine=1, technic_mv=1},
+	legacy_facedir_simple = true,
+	sounds = default.node_sound_wood_defaults(),
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", S("Hydro %s Generator"):format("MV"))
+		meta:set_int("MV_EU_supply", 0)
+	end,
+	technic_run = run,
+})
+
+minetest.register_node("technic:hydro_turbine_active", {
+	description = S("Hydro %s Generator"):format("MV"),
+	tiles = {"technic_hydro_turbine_top_active.png", "technic_machine_bottom.png",
+			"technic_hydro_turbine_side.png", "technic_hydro_turbine_side.png",
+			"technic_hydro_turbine_side.png", "technic_hydro_turbine_side.png"},
+	paramtype2 = "facedir",
+	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
+			technic_machine=1, technic_mv=1, not_in_creative_inventory=1},
+	legacy_facedir_simple = true,
+	sounds = default.node_sound_wood_defaults(),
+	drop = "technic:hydro_turbine",
+	technic_run = run,
+	technic_disabled_machine_name = "technic:hydro_turbine",
+})
+
+technic.register_machine("MV", "technic:hydro_turbine",        technic.producer)
+technic.register_machine("MV", "technic:hydro_turbine_active", technic.producer)
diff --git a/technic/machines/MV/init.lua b/technic/machines/MV/init.lua
index 72a98b6..7092fda 100644
--- a/technic/machines/MV/init.lua
+++ b/technic/machines/MV/init.lua
@@ -13,6 +13,7 @@ if technic.config:get_bool("enable_wind_mill") then
 end
 dofile(path.."/generator.lua")
 dofile(path.."/solar_array.lua")
+dofile(path.."/hydro_turbine.lua")
 
 -- Machines
 dofile(path.."/alloy_furnace.lua")
diff --git a/technic/textures/technic_hydro_turbine_side.png b/technic/textures/technic_hydro_turbine_side.png
new file mode 100644
index 0000000..eeb5ab2
--- /dev/null
+++ b/technic/textures/technic_hydro_turbine_side.png
diff --git a/technic/textures/technic_hydro_turbine_top.png b/technic/textures/technic_hydro_turbine_top.png
new file mode 100644
index 0000000..e04533f
--- /dev/null
+++ b/technic/textures/technic_hydro_turbine_top.png
diff --git a/technic/textures/technic_hydro_turbine_top_active.png b/technic/textures/technic_hydro_turbine_top_active.png
new file mode 100644
index 0000000..54ff90f
--- /dev/null
+++ b/technic/textures/technic_hydro_turbine_top_active.png