local simplex_noise = require('utils.math.simplex_noise').d2

--add or use noise templates from here
local noises = {
	['bb_biterland'] = {
		{ modifier = 0.001, weight = 1 },
		{ modifier = 0.01, weight = 0.35 },
		{ modifier = 0.1, weight = 0.015 },
	},
	['bb_ore'] = {
		{ modifier = 0.0042, weight = 1 },
		{ modifier = 0.031, weight = 0.08 },
		{ modifier = 0.1, weight = 0.025 },
	},
	['cave_ponds'] = { { modifier = 0.01, weight = 1 }, { modifier = 0.1, weight = 0.06 } },
	['smol_areas'] = { { modifier = 0.01, weight = 1 }, { modifier = 0.1, weight = 0.02 }, {
		modifier = 0.1,
		weight = 0.03,
	} },
	['cave_worms'] = { { modifier = 0.001, weight = 1 }, { modifier = 0.1, weight = 0.06 } },
	['cave_rivers'] = {
		{ modifier = 0.005, weight = 1 },
		{ modifier = 0.01, weight = 0.25 },
		{ modifier = 0.05, weight = 0.01 },
	},
	['cave_rivers_2'] = {
		{ modifier = 0.003, weight = 1 },
		{ modifier = 0.01, weight = 0.21 },
		{ modifier = 0.05, weight = 0.01 },
	},
	['cave_rivers_3'] = {
		{ modifier = 0.002, weight = 1 },
		{ modifier = 0.01, weight = 0.15 },
		{ modifier = 0.05, weight = 0.01 },
	},
	['cave_rivers_4'] = {
		{ modifier = 0.001, weight = 1 },
		{ modifier = 0.01, weight = 0.11 },
		{ modifier = 0.05, weight = 0.01 },
	},
	['decoratives'] = {
		{ modifier = 0.03, weight = 1 },
		{ modifier = 0.05, weight = 0.25 },
		{ modifier = 0.1, weight = 0.05 },
	},
	['dungeons'] = { { modifier = 0.0025, weight = 1 }, { modifier = 0.005, weight = 0.25 } },
	['dungeon_sewer'] = {
		{ modifier = 0.0005, weight = 1 },
		{ modifier = 0.005, weight = 0.015 },
		{ modifier = 0.025, weight = 0.0015 },
	},
	['large_caves'] = {
		{ modifier = 0.0033, weight = 1 },
		{ modifier = 0.01, weight = 0.22 },
		{ modifier = 0.05, weight = 0.05 },
		{ modifier = 0.1, weight = 0.04 },
	},
	['n1'] = { { modifier = 0.0001, weight = 1 } },
	['n2'] = { { modifier = 0.001, weight = 1 } },
	['n3'] = { { modifier = 0.01, weight = 1 } },
	['n4'] = { { modifier = 0.1, weight = 1 } },
	['n5'] = { { modifier = 0.07, weight = 1 } },
	['watery_world'] = {
		{ modifier = 0.0007, weight = 1 },
		{ modifier = 0.01, weight = 0.02 },
		{ modifier = 0.1, weight = 0.005 },
	},
	['no_rocks'] = {
		{ modifier = 0.0033, weight = 1 },
		{ modifier = 0.01, weight = 0.22 },
		{ modifier = 0.05, weight = 0.05 },
		{ modifier = 0.1, weight = 0.04 },
	},
	['no_rocks_2'] = { { modifier = 0.013, weight = 1 }, { modifier = 0.1, weight = 0.1 } },
	['oasis'] = {
		{ modifier = 0.0015, weight = 1 },
		{ modifier = 0.0025, weight = 0.5 },
		{ modifier = 0.01, weight = 0.15 },
		{ modifier = 0.1, weight = 0.017 },
	},
	['scrapyard'] = {
		{ modifier = 0.005, weight = 1 },
		{ modifier = 0.01, weight = 0.35 },
		{ modifier = 0.05, weight = 0.23 },
		{ modifier = 0.1, weight = 0.11 },
	},
	['big_cave'] = {
		{ modifier = 0.003, weight = 1 },
		{ modifier = 0.02, weight = 0.05 },
		{ modifier = 0.15, weight = 0.02 },
	},
	['small_caves'] = {
		{ modifier = 0.008, weight = 1 },
		{ modifier = 0.03, weight = 0.15 },
		{ modifier = 0.25, weight = 0.05 },
	},
	['small_caves_2'] = {
		{ modifier = 0.009, weight = 1 },
		{ modifier = 0.05, weight = 0.25 },
		{ modifier = 0.25, weight = 0.05 },
	},
	['forest_location'] = {
		{ modifier = 0.006, weight = 1 },
		{ modifier = 0.01, weight = 0.25 },
		{ modifier = 0.05, weight = 0.15 },
		{ modifier = 0.1, weight = 0.05 },
	},
	['forest_density'] = {
		{ modifier = 0.01, weight = 1 },
		{ modifier = 0.05, weight = 0.5 },
		{ modifier = 0.1, weight = 0.025 },
	},
	['cave_miner_01'] = {
		{ modifier = 0.002, weight = 1 },
		{ modifier = 0.003, weight = 0.5 },
		{ modifier = 0.01, weight = 0.01 },
		{ modifier = 0.1, weight = 0.015 },
	},
	['cave_miner_02'] = {
		{ modifier = 0.006, weight = 1 },
		{ modifier = 0.02, weight = 0.15 },
		{ modifier = 0.25, weight = 0.025 },
	},
	['cm_ponds'] = { { modifier = 0.025, weight = 1 }, { modifier = 0.05, weight = 0.25 }, {
		modifier = 0.1,
		weight = 0.05,
	} },
	['cm_ocean'] = {
		{ modifier = 0.002, weight = 1 },
		{ modifier = 0.004, weight = 1 },
		{ modifier = 0.02, weight = 0.05 },
	},
}

--returns a float number between -1 and 1
local function get_noise(name, pos, seed)
	local noise = 0
	local d = 0
	for i = 1, #noises[name] do
		local mod = noises[name]
		noise = noise + simplex_noise(pos.x * mod[i].modifier, pos.y * mod[i].modifier, seed, 0xF) * mod[i].weight
		d = d + mod[i].weight
		seed = seed + seed / seed
	end
	noise = noise / d
	return noise
end

return get_noise