core.register_alias("mapgen_stone", "pyutest_blocks:stone")
core.register_alias("mapgen_water_source", "pyutest_blocks:water_source")
core.register_alias("mapgen_river_water_source", "pyutest_blocks:water_source")
core.register_alias("mapgen_lava_source", "pyutest_blocks:lava_source")
core.register_alias("mapgen_singlenode", "air")

local settings = core.settings
local mg_flags = settings:get_flags("mg_flags")
local mg_name = core.get_mapgen_setting("mg_name")
core.set_mapgen_setting(string.format("mg%s_cavern_threshold", mg_name), "0.20", true)
core.set_mapgen_setting(string.format("mg%s_mount_zero_level", mg_name), "0.42", true)
core.set_mapgen_setting(string.format("mg%s_large_cave_num_min", mg_name), "1", true)
core.set_mapgen_setting(string.format("mg%s_large_cave_num_max", mg_name), "4", true)

mg_flags.caverns = true
mg_flags.dungeons = false

-- https://git.minetest.land/VoxeLibre/VoxeLibre/src/branch/master/mods/MAPGEN/mcl_mapgen_core/init.lua#L127
local mg_flags_str = ""
for k, v in pairs(mg_flags) do
  if v == false then
    k = "no" .. k
  end
  mg_flags_str = mg_flags_str .. k .. ","
end
if string.len(mg_flags_str) > 0 then
  mg_flags_str = string.sub(mg_flags_str, 1, string.len(mg_flags_str) - 1)
end
core.set_mapgen_setting("mg_flags", mg_flags_str, true)

local function change_np_group(key, fn)
  local np = settings:get_np_group(key)

  if np then
    np = PyuTest.util.tableconcat(fn(np), np)

    settings:set_np_group(key, np)
  end
end

change_np_group(string.format("mg%s_np_cave1", mg_name), function ()
  return {
    spread = {
      x = 447,
      y = 447,
      z = 247
    }
  }
end)

change_np_group(string.format("mg%s_np_cave2", mg_name), function ()
  return {
    spread = {
      x = 235,
      y = 235,
      z = 235
    }
  }
end)

change_np_group(string.format("mg%s_np_mountain", mg_name), function ()
  return {
    spread = {
      x = 400,
      y = 520,
      z = 400,
    }
  }
end)

change_np_group(string.format("mg%s_np_mount_height", mg_name), function ()
  return {
    spread = {
      x = 1350,
      z = 1350,
    }
  }
end)

change_np_group(string.format("mg%s_np_terrain_base", mg_name), function ()
  return {
    spread = {
      x = 925,
      z = 925,
    }
  }
end)


change_np_group(string.format("mg%s_np_terrain_alt", mg_name), function ()
  return {
    spread = {
      x = 725,
      z = 725,
    }
  }
end)