-- Template to register a grass or fern decoration
local function register_fern_decoration(offset, scale, biomes)
	for b = 1, #biomes do
		local param2 = minetest.registered_biomes[biomes[b]]._mcl_grass_palette_index
		mcl_mapgen_core.register_decoration({
			deco_type = "simple",
			priority = 1500,
			place_on = {"group:grass_block_no_snow", "mcl_core:podzol", "mcl_mud:mud"},
			sidelen = 16,
			noise_params = {
				offset = offset,
				scale = scale,
				spread = vector.new(200, 200, 200),
				seed = 333,
				octaves = 3,
				persist = 0.6
			},
			biomes = {biomes[b]},
			y_min = 1,
			y_max = vl_biomes.overworld_max,
			decoration = "mcl_flowers:fern",
			param2 = param2,
		})
	end
end

local fern_minimal = {"Jungle", "JungleM", "JungleEdge", "JungleEdgeM", "Taiga", "MegaTaiga", "MegaSpruceTaiga", "ColdTaiga", "MangroveSwamp"}
local fern_low = {"Jungle", "JungleM", "JungleEdge", "JungleEdgeM", "Taiga", "MegaTaiga", "MegaSpruceTaiga"}
local fern_Jungle = {"Jungle", "JungleM", "JungleEdge", "JungleEdgeM"}
--local fern_JungleM = { "JungleM" },

-- FIXME: register once per biome only, with appropriate parameters?
register_fern_decoration(-0.03, 0.09, fern_minimal)
register_fern_decoration(-0.015, 0.075, fern_minimal)
register_fern_decoration(0, 0.06, fern_minimal)
register_fern_decoration(0.015, 0.045, fern_low)
register_fern_decoration(0.03, 0.03, fern_low)
register_fern_decoration(0.01, 0.05, fern_Jungle)
register_fern_decoration(0.03, 0.03, fern_Jungle)
register_fern_decoration(0.05, 0.01, fern_Jungle)
register_fern_decoration(0.07, -0.01, fern_Jungle)
register_fern_decoration(0.09, -0.03, fern_Jungle)
register_fern_decoration(0.12, -0.03, {"JungleM"})

-- Large ferns
local function register_double_fern(offset, scale, biomes)
	for b = 1, #biomes do
		local param2 = minetest.registered_biomes[biomes[b]]._mcl_grass_palette_index
		mcl_mapgen_core.register_decoration({
			deco_type = "schematic",
			priority = 1500,
			schematic = {
				size = vector.new(1, 3, 1),
				data = {
					{name = "air", prob = 0},
					{name = "mcl_flowers:double_fern", param1 = 255, param2 = param2},
					{name = "mcl_flowers:double_fern_top", param1 = 255, param2 = param2},
				},
			},
			place_on = {"group:grass_block_no_snow", "mcl_core:podzol"},
			sidelen = 16,
			noise_params = {
				offset = offset,
				scale = scale,
				spread = vector.new(250, 250, 250),
				seed = 333,
				octaves = 2,
				persist = 0.66,
			},
			y_min = 1,
			y_max = vl_biomes.overworld_max,
			biomes = biomes[b],
		})
	end
end

register_double_fern(0.01, 0.03, {"Jungle", "JungleM", "JungleEdge", "JungleEdgeM", "Taiga", "ColdTaiga", "MegaTaiga", "MegaSpruceTaiga", "BambooJungle", "BambooJungleM", "BambooJungleEdge", "BambooJungleEdgeM", })
register_double_fern(0.15, 0.1, {"JungleM", "BambooJungleM", "BambooJungle"})