-- Code by Mossmanikin, Neuromancer, and others

-----------------------------------------------------------------------------------------------
-- TWiGS
-----------------------------------------------------------------------------------------------

function check_node_buildable_to(pos)
	local node = minetest.get_node(pos)
	local def = minetest.registered_nodes[node.name]
	if def then
		return def.buildable_to
	end
end

abstract_trunks.place_twig = function(pos)
	local twig_size     = math.random(1,27)

	local right_here    = {x=pos.x  , y=pos.y+1, z=pos.z  }
	local north         = {x=pos.x  , y=pos.y+1, z=pos.z+1}
	local north_east    = {x=pos.x+1, y=pos.y+1, z=pos.z+1}
	local east          = {x=pos.x+1, y=pos.y+1, z=pos.z  }
	local south_east    = {x=pos.x+1, y=pos.y+1, z=pos.z-1}
	local south         = {x=pos.x  , y=pos.y+1, z=pos.z-1}
	local south_west    = {x=pos.x-1, y=pos.y+1, z=pos.z-1}
	local west          = {x=pos.x-1, y=pos.y+1, z=pos.z  }
	local north_west    = {x=pos.x-1, y=pos.y+1, z=pos.z+1}

--	small twigs
	if twig_size <= 16 then
		minetest.swap_node(right_here, {name="trunks:twig_"..math.random(1,4), param2=math.random(0,3)})
	end
--	big twig 1
	if twig_size == 17 then
		if not (check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z+1})
			or check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_5"})
			end
			if check_node_buildable_to(north_east) then
				minetest.swap_node(north_east, {name="trunks:twig_7"})
			end
			if check_node_buildable_to(east) then
				minetest.swap_node(east,		  {name="trunks:twig_8"})
			end
		end
	elseif twig_size == 18 then
		if not (check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z-1})
			or check_node_buildable_to({x=pos.x,y=pos.y,z=pos.z-1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_5", param2=1})
			end
			if check_node_buildable_to(south_east) then
				minetest.swap_node(south_east, {name="trunks:twig_7", param2=1})
			end
			if check_node_buildable_to(south) then
				minetest.swap_node(south,	  {name="trunks:twig_8", param2=1})
			end
		end
	elseif twig_size == 19 then
		if not (check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z-1})
			or check_node_buildable_to({x=pos.x-1,y=pos.y,z=pos.z})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_5", param2=2})
			end
			if check_node_buildable_to(south_west) then
				minetest.swap_node(south_west, {name="trunks:twig_7", param2=2})
			end
			if check_node_buildable_to(west) then
				minetest.swap_node(west,		  {name="trunks:twig_8", param2=2})
			end
		end
	elseif twig_size == 20 then
		if not (check_node_buildable_to({x=pos.x-1,y=pos.y,z=pos.z+1})
			or check_node_buildable_to({x=pos.x,y=pos.y,z=pos.z+1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_5", param2=3})
			end
			if check_node_buildable_to(north_west) then
				minetest.swap_node(north_west, {name="trunks:twig_7", param2=3})
			end
			if check_node_buildable_to(north) then
				minetest.swap_node(north,	  {name="trunks:twig_8", param2=3})
			end
		end
--	big twig 2
	elseif twig_size == 21 then
		if not (check_node_buildable_to({x=pos.x,y=pos.y,z=pos.z+1})
			or check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z+1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_9"})
			end
			if check_node_buildable_to(north) then
				minetest.swap_node(north,	  {name="trunks:twig_10"})
			end
			if check_node_buildable_to(north_east) then
				minetest.swap_node(north_east, {name="trunks:twig_11"})
			end
		end
	elseif twig_size == 22 then
		if not (check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z})
			or check_node_buildable_to({x=pos.x+1,y=pos.y,z=pos.z-1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_9", param2=1})
			end
			if check_node_buildable_to(east) then
				minetest.swap_node(east,		  {name="trunks:twig_10", param2=1})
			end
			if check_node_buildable_to(south_east) then
				minetest.swap_node(south_east, {name="trunks:twig_11", param2=1})
			end
		end
	elseif twig_size == 23 then
		if not (check_node_buildable_to({x=pos.x,y=pos.y,z=pos.z-1})
			or check_node_buildable_to({x=pos.x-1,y=pos.y,z=pos.z-1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_9", param2=2})
			end
			if check_node_buildable_to(south) then
				minetest.swap_node(south,	  {name="trunks:twig_10", param2=2})
			end
			if check_node_buildable_to(south_west) then
				minetest.swap_node(south_west, {name="trunks:twig_11", param2=2})
			end
		end
	elseif twig_size == 24 then
		if not (check_node_buildable_to({x=pos.x-1,y=pos.y,z=pos.z})
			or check_node_buildable_to({x=pos.x-1,y=pos.y,z=pos.z+1})) then

			if check_node_buildable_to(right_here) then
				minetest.swap_node(right_here, {name="trunks:twig_9", param2=3})
			end
			if check_node_buildable_to(west) then
				minetest.swap_node(west,		  {name="trunks:twig_10", param2=3})
			end
			if check_node_buildable_to(north_west) then
				minetest.swap_node(north_west, {name="trunks:twig_11", param2=3})
			end
		end
	elseif twig_size <= 25 then
		minetest.swap_node(right_here, {name="trunks:twig_"..math.random(12,13), param2=math.random(0,3)})
	end
end

biome_lib.register_on_generate({
    surface = {"default:dirt_with_grass"},
    max_count = 640,
    rarity = 66,
    min_elevation = 1,
	max_elevation = 40,
	near_nodes = {"group:tree","ferns:fern_03","ferns:fern_02","ferns:fern_01"},
	near_nodes_size = 3,
	near_nodes_vertical = 1,
	near_nodes_count = 1,
    plantlife_limit = -0.9,
  },
  abstract_trunks.place_twig
)

biome_lib.register_on_generate({
    surface = {"default:water_source"},
    max_count = 320,
    rarity = 33,
    min_elevation = 1,
	max_elevation = 40,
	near_nodes = {"group:tree"},
	near_nodes_size = 3,
	near_nodes_vertical = 1,
	near_nodes_count = 1,
    plantlife_limit = -0.9,
  },
  abstract_trunks.place_twig
)

-----------------------------------------------------------------------------------------------
-- TRuNKS
-----------------------------------------------------------------------------------------------
local TRuNKS = {
--	  MoD						 TRuNK						NR
    {"default",					"tree",						 1},
	{"default",					"jungletree",				 2},
	{"default",					"pine_tree",				12},

	{"trees",					"tree_conifer",				 3},
	{"trees",					"tree_mangrove",			 4},
	{"trees",					"tree_palm",				 5},

	{"moretrees",				"apple_tree_trunk",			 6},
	{"moretrees",				"beech_trunk",				 7},
	{"moretrees",				"birch_trunk",				 8},
	{"moretrees",				"fir_trunk",				 9},
	{"moretrees",				"oak_trunk",				10},
	{"moretrees",				"palm_trunk",				11},
	{"moretrees",				"rubber_tree_trunk",		13},
	{"moretrees",				"rubber_tree_trunk_empty",	14},
	{"moretrees",				"sequoia_trunk",			15},
	{"moretrees",				"spruce_trunk",				16},
	{"moretrees",				"willow_trunk",				17},
}

for i in pairs(TRuNKS) do
	local	MoD =	TRuNKS[i][1]
	local	TRuNK = TRuNKS[i][2]
	local	NR =	TRuNKS[i][3]
	local	trunkname = MoD..":"..TRuNK
	if minetest.get_modpath(MoD) ~= nil
	and NR < 6 -- moretrees trunks allready have facedir
	and minetest.registered_nodes[trunkname] then -- the node being called exists.
			temptrunk = table.copy(minetest.registered_nodes[trunkname])
			temptrunk.paramtype2 = "facedir"
			minetest.register_node(":"..trunkname, temptrunk)
	end
end

abstract_trunks.place_trunk = function(pos)

	local right_here = {x=pos.x, y=pos.y+1, z=pos.z}
	local north = {x=pos.x, y=pos.y+1, z=pos.z+1}
	local north2 = {x=pos.x, y=pos.y+1, z=pos.z+2}
	local south = {x=pos.x, y=pos.y+1, z=pos.z-1}
	local south2 = {x=pos.x, y=pos.y+1, z=pos.z-2}
	local west = {x=pos.x-1, y=pos.y+1, z=pos.z}
	local west2 = {x=pos.x-2, y=pos.y+1, z=pos.z}
	local east = {x=pos.x+1, y=pos.y+1, z=pos.z}
	local east2 = {x=pos.x+2, y=pos.y+1, z=pos.z}

	if check_node_buildable_to(right_here) then -- instead of check_air = true,
		for i in pairs(TRuNKS) do
			local	MoD =			TRuNKS[i][1]
			local	TRuNK =			TRuNKS[i][2]
			local	NR =			TRuNKS[i][3]
			local	chance =		math.random(1, 17)
			local	length =		math.random(3,5)
			if chance == NR then
				local trunk_type = math.random(1,3)
				if trunk_type == 1 then
					if minetest.get_modpath(MoD) ~= nil then
						minetest.swap_node(right_here, {name=MoD..":"..TRuNK})
					else
						minetest.swap_node(right_here, {name="default:tree"})
					end
				elseif trunk_type == 2 then
					if minetest.get_modpath(MoD) ~= nil then
						if check_node_buildable_to(north) then
							minetest.swap_node(north, {name=MoD..":"..TRuNK, param2=4})
						end

						if length >= 4 and check_node_buildable_to(north2) then
							minetest.swap_node(north2, {name=MoD..":"..TRuNK, param2=4})
						end

						minetest.swap_node(right_here, {name=MoD..":"..TRuNK, param2=4})
						if check_node_buildable_to(south) then
							minetest.swap_node(south, {name=MoD..":"..TRuNK, param2=4})
						end
						if length == 5 and check_node_buildable_to(south2) then
							minetest.swap_node(south2, {name=MoD..":"..TRuNK, param2=4})
						end
					else
						if check_node_buildable_to(north) then
							minetest.swap_node(north, {name="default:tree", param2=4})
						end
						if length >= 4 and check_node_buildable_to(north2) then
							minetest.swap_node(north2, {name="default:tree", param2=4})
						end
						minetest.swap_node(right_here, {name="default:tree", param2=4})
						if check_node_buildable_to(south) then
							minetest.swap_node(south, {name="default:tree", param2=4})
						end
						if length == 5 and check_node_buildable_to(south2) then
							minetest.swap_node(south2, {name="default:tree", param2=4})
						end
					end
				elseif trunk_type == 3 then
					if minetest.get_modpath(MoD) ~= nil then
						if check_node_buildable_to(west) then
							minetest.swap_node(west, {name=MoD..":"..TRuNK, param2=12})
						end
						if length >= 4 and check_node_buildable_to(west2) then
							minetest.swap_node(west2, {name=MoD..":"..TRuNK, param2=12})
						end
						minetest.swap_node(right_here, {name=MoD..":"..TRuNK, param2=12})
						if check_node_buildable_to(east) then
							minetest.swap_node(east, {name=MoD..":"..TRuNK, param2=12})
						end
						if length == 5 and check_node_buildable_to(east2) then
							minetest.swap_node(east2, {name=MoD..":"..TRuNK, param2=12})
						end
					else
						if check_node_buildable_to(west) then
							minetest.swap_node(west, {name="default:tree", param2=12})
						end
						if length >= 4 and check_node_buildable_to(west2) then
							minetest.swap_node(west2, {name="default:tree", param2=12})
						end
						minetest.swap_node(right_here, {name="default:tree", param2=12})
						if check_node_buildable_to(east) then
							minetest.swap_node(east, {name="default:tree", param2=12})
						end
						if length == 5 and check_node_buildable_to(east2) then
							minetest.swap_node(east2, {name="default:tree", param2=12})
						end
					end
				end
			end
		end
	end
end

biome_lib.register_on_generate({
    surface = {"default:dirt_with_grass"},
    max_count = 320, -- 320,
    rarity = 99, -- 99,
    min_elevation = 1,
	max_elevation = 40,
	avoid_nodes = {"group:tree"},
	avoid_radius = 1,
	near_nodes = {"group:tree","ferns:fern_03","ferns:fern_02","ferns:fern_01"},
	near_nodes_size = 3,
	near_nodes_vertical = 1,
	near_nodes_count = 1,
    plantlife_limit = -0.9,
  },
  abstract_trunks.place_trunk
)

-----------------------------------------------------------------------------------------------
-- MoSS & FuNGuS -- on ground
-----------------------------------------------------------------------------------------------
abstract_trunks.grow_moss_on_ground = function(pos)
	local on_ground = {x=pos.x, y=pos.y+1, z=pos.z}
	local moss_type = math.random(1,21)
	local rot = math.random(0,3)

	if moss_type == 1 then
		minetest.swap_node(on_ground, {name="trunks:moss_with_fungus_"..rot, param2=1})
	else
		minetest.swap_node(on_ground, {name="trunks:moss_plain_"..rot, param2=1})
	end

end

biome_lib.register_on_generate({
    surface = {"default:dirt_with_grass"},
    max_count = 400,
    rarity = 79,
    min_elevation = 1,
	max_elevation = 40,
	near_nodes = {
		"group:tree",
		"ferns:fern_03",
		"ferns:fern_02",
		"ferns:fern_01"
	},
	near_nodes_size = 2,
	near_nodes_vertical = 1,
	near_nodes_count = 1,
    plantlife_limit = -0.9,
  },
  abstract_trunks.grow_moss_on_ground
)

-----------------------------------------------------------------------------------------------
-- MoSS & FuNGuS -- on trunks
-----------------------------------------------------------------------------------------------
abstract_trunks.grow_moss_on_trunk = function(pos)
	local on_ground = {x=pos.x, y=pos.y+1, z=pos.z}
	local at_side_n = {x=pos.x, y=pos.y, z=pos.z+1}
	local at_side_e = {x=pos.x+1, y=pos.y, z=pos.z}
	local at_side_s = {x=pos.x, y=pos.y, z=pos.z-1}
	local at_side_w = {x=pos.x-1, y=pos.y, z=pos.z}

	--if minetest.get_item_group(node_under.name, "tree") < 1 then
		if check_node_buildable_to(on_ground) then
			local moss_type = math.random(1,41)
			local rot = math.random(0,3)
			if moss_type == 1 then
				minetest.swap_node(on_ground, {name="trunks:moss_with_fungus_"..rot, param2=1})
			elseif moss_type < 22 then
				minetest.swap_node(on_ground, {name="trunks:moss_plain_"..rot, param2=1})
			end
		end
		if check_node_buildable_to(at_side_n) then
			local moss_type = math.random(1,31) -- cliche of more moss at north
			local rot = math.random(0,3)
			if moss_type == 1 then
				minetest.swap_node(at_side_n, {name="trunks:moss_with_fungus_"..rot, param2=5})
			elseif moss_type < 22 then
				minetest.swap_node(at_side_n, {name="trunks:moss_plain_"..rot, param2=5})
			end
		end
		if check_node_buildable_to(at_side_e) then
			local moss_type = math.random(1,41)
			local rot = math.random(0,3)
			if moss_type == 1 then
				minetest.swap_node(at_side_e, {name="trunks:moss_with_fungus_"..rot, param2=3})
			elseif moss_type < 22 then
				minetest.swap_node(at_side_e, {name="trunks:moss_plain_"..rot, param2=3})
			end
		end
		if check_node_buildable_to(at_side_s) then
			local moss_type = math.random(1,41)
			local rot = math.random(0,3)
			if moss_type == 1 then
				minetest.swap_node(at_side_s, {name="trunks:moss_with_fungus_"..rot, param2=4})
			elseif moss_type < 22 then
				minetest.swap_node(at_side_s, {name="trunks:moss_plain_"..rot, param2=4})
			end
		end
		if check_node_buildable_to(at_side_w) then
			local moss_type = math.random(1,41)
			local rot = math.random(0,3)
			if moss_type == 1 then
				minetest.swap_node(at_side_w, {name="trunks:moss_with_fungus_"..rot, param2=2})
			elseif moss_type < 22 then
				minetest.swap_node(at_side_w, {name="trunks:moss_plain_"..rot, param2=2})
			end
		end
	--end
end

biome_lib.register_on_generate({
    surface = {
		"default:tree",
		"default:jungletree",
		"default:pine_tree",
		"trees:tree_conifer",
		"trees:tree_mangrove",
		--"trees:tree_palm",
		"moretrees:apple_tree_trunk",
		"moretrees:beech_trunk",
		"moretrees:birch_trunk",
		"moretrees:fir_trunk",
		"moretrees:oak_trunk",
		--"moretrees:palm_trunk",
		"moretrees:rubber_tree_trunk",
		"moretrees:rubber_tree_trunk_empty",
		"moretrees:sequoia_trunk",
		"moretrees:spruce_trunk",
		"moretrees:willow_trunk",
		"default:mossycobble"
	},
    max_count = 640,
    rarity = 24,
    min_elevation = 1,
	max_elevation = 40,
    plantlife_limit = -0.9,
	check_air = false,
  },
  "abstract_trunks.grow_moss_on_trunk"
)

-----------------------------------------------------------------------------------------------
-- RooTS
-----------------------------------------------------------------------------------------------
abstract_trunks.grow_roots = function(pos)
	local right_here	= {x=pos.x  , y=pos.y  , z=pos.z  }
	local below		= {x=pos.x  , y=pos.y-1, z=pos.z  }
	local north		= {x=pos.x  , y=pos.y  , z=pos.z+1}
	local east			= {x=pos.x+1, y=pos.y  , z=pos.z  }
	local south		= {x=pos.x  , y=pos.y  , z=pos.z-1}
	local west			= {x=pos.x-1, y=pos.y  , z=pos.z  }

	local node_here		= minetest.get_node(right_here)
	local node_below	= minetest.get_node(below)

	for i in pairs(TRuNKS) do
		local	MoD =			TRuNKS[i][1]
		local	TRuNK =			TRuNKS[i][2]
		if minetest.get_modpath(MoD) ~= nil
		and node_here.name == MoD..":"..TRuNK
		and string.find(node_below.name, "dirt")
		and node_here.param2 == 0 then
			if check_node_buildable_to(north) then
				minetest.swap_node(north, {name="trunks:"..TRuNK.."root", param2=2})
			end
			if check_node_buildable_to(east) then
				minetest.swap_node(east, {name="trunks:"..TRuNK.."root", param2=3})
			end
			if check_node_buildable_to(south) then
				minetest.swap_node(south, {name="trunks:"..TRuNK.."root", param2=0})
			end
			if check_node_buildable_to(west) then
				minetest.swap_node(west, {name="trunks:"..TRuNK.."root", param2=1})
			end
		end
	end
end

biome_lib.register_on_generate({
    surface = {"group:tree"},
    max_count = 1000,
    rarity = 1,
    min_elevation = 1,
	max_elevation = 40,
	near_nodes = {"default:dirt_with_grass"},
	near_nodes_size = 1,
	near_nodes_vertical = 1,
	near_nodes_count = 1,
    plantlife_limit = -1,
    check_air = false,
  },
  "abstract_trunks.grow_roots"
)