local mod_mcl_structures = minetest.get_modpath("mcl_structures")

-- Ice Plains Spikes (rare) aka Ice Spikes
vl_biomes.register_biome({
	name = "IcePlainsSpikes",
	node_top = "mcl_core:snowblock",
	depth_top = 1,
	node_filler = "mcl_core:dirt",
	depth_filler = 2,
	node_water_top = "mcl_core:ice",
	depth_water_top = 1,
	node_river_water = "mcl_core:ice",
	node_riverbed = "mcl_core:sand",
	depth_riverbed = 2,
	y_min = 1,
	y_max = vl_biomes.overworld_max,
	humidity_point = 24,
	heat_point = -5,
	_mcl_biome_type = "snowy",
	_mcl_water_temp = "frozen",
	_mcl_grass_palette_index = 2,
	_mcl_foliage_palette_index = 2,
	_mcl_water_palette_index = 5,
	_mcl_skycolor = "#7FA1FF",
	_ocean = {
		node_top = "mcl_core:gravel",
		depth_top = 1,
		node_filler = "mcl_core:gravel",
		depth_filler = 3,
		_mcl_skycolor = "#7FA1FF", -- not default, but icy
	},
})

-- FIXME: on slopes, they tend to float on one side. Use even larger spikes and a negative y_offset?
-- Large ice spike
mcl_mapgen_core.register_decoration({
	deco_type = "schematic",
	place_on = {"mcl_core:snowblock", "mcl_core:snow", "group:grass_block_snow"},
	sidelen = 80,
	noise_params = {
		offset = 0.00040,
		scale = 0.001,
		spread = vector.new(250, 250, 250),
		seed = 1133,
		octaves = 4,
		persist = 0.67,
	},
	biomes = {"IcePlainsSpikes"},
	y_min = 4,
	y_max = vl_biomes.overworld_max,
	schematic = mod_mcl_structures .. "/schematics/mcl_structures_ice_spike_large.mts",
	rotation = "random",
	flags = "place_center_x, place_center_z",
})

-- Small ice spike
mcl_mapgen_core.register_decoration({
	deco_type = "schematic",
	place_on = {"mcl_core:snowblock", "mcl_core:snow", "group:grass_block_snow"},
	sidelen = 80,
	noise_params = {
		offset = 0.005,
		scale = 0.001,
		spread = vector.new(250, 250, 250),
		seed = 1133,
		octaves = 4,
		persist = 0.67,
	},
	biomes = {"IcePlainsSpikes"},
	y_min = 4,
	y_max = vl_biomes.overworld_max,
	schematic = mod_mcl_structures .. "/schematics/mcl_structures_ice_spike_small.mts",
	rotation = "random",
	flags = "place_center_x, place_center_z",
})