PyuTestCore.make_node_sounds = function(tbl)
  local t = tbl or {}
  t.footstep = t.footstep or {name = "block_walk", gain = 1}
  t.dug = t.dug or {name = "block_break", gain = 0.50}
  t.place = t.place or {name = "block_place", gain = 0.50}
  return t
end

PyuTestCore.make_node = function(nsname, sname, desc, groups, tiles, extra_conf)
  local conf = {
    description = Translate(desc),
    tiles = tiles,
    groups = groups,
    sounds = PyuTestCore.make_node_sounds()
  }

  if extra_conf ~= nil then
    for k, v in pairs(extra_conf) do
      conf[k] = v
    end
  end

  minetest.register_node(nsname, conf)
  minetest.register_alias(sname, nsname)
end

PyuTestCore.node_boxes = {
  CARPET = {
    type = "fixed",
    fixed = {-0.5, -0.5, -0.5, 0.5, -0.45, 0.5}
  },
  SLAB = {
    type = "fixed",
    fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5}
  },
  PILLAR = {
    type = "fixed",
    fixed = {-0.15, -0.5, -0.15, 0.15, 0.5, 0.15}
  }
}
PyuTestCore.building_blocks = {}

PyuTestCore.make_building_blocks = function (color, dcolor, tex, colortint, cgroups, extra_conf)
  local groups = cgroups or {
    block = PyuTestCore.BLOCK_BREAKABLE_NORMAL
  }
  groups["block"] = groups["block"] or PyuTestCore.BLOCK_BREAKABLE_NORMAL

  local econf = extra_conf or {}
  local id_block = "pyutest_core:"..color.."_block"
  local id_carpet = "pyutest_core:"..color.."_carpet"
  local id_slab = "pyutest_core:"..color.."_slab"
  local id_pillar = "pyutest_core:"..color.."_pillar"

  minetest.register_node(id_block, PyuTestCore.util.tableconcat({
    description = Translate(dcolor.." Block"),
    tiles = tex,
    color = colortint,
    groups = groups,
    sounds = PyuTestCore.make_node_sounds(),
  }, econf))
  table.insert(PyuTestCore.building_blocks, id_block)
  minetest.register_alias(color.."_block", id_block)

  minetest.register_node(id_carpet, PyuTestCore.util.tableconcat({
    description = Translate(dcolor .. " Carpet"),
    tiles = tex,
    groups = groups,
    color = colortint,
    drawtype = "nodebox",
    paramtype = "light",
    paramtype2 = "facedir",
    node_box = PyuTestCore.node_boxes.CARPET,
    sounds = PyuTestCore.make_node_sounds(),
  }, econf))
  table.insert(PyuTestCore.building_blocks, id_carpet)
  minetest.register_alias(color.."_carpet", id_carpet)

  minetest.register_node(id_slab, PyuTestCore.util.tableconcat({
    description = Translate(dcolor.." Slab"),
    tiles = tex,
    groups = groups,
    color = colortint,
    drawtype = "nodebox",
    paramtype = "light",
    paramtype2 = "facedir",
    node_box = PyuTestCore.node_boxes.SLAB,
    sounds = PyuTestCore.make_node_sounds(),
  }, econf))
  table.insert(PyuTestCore.building_blocks, id_slab)
  minetest.register_alias(color.."_slab", id_slab)

  minetest.register_node(id_pillar, PyuTestCore.util.tableconcat({
    description = Translate(dcolor.." Pillar"),
    tiles = tex,
    groups = groups,
    color = colortint,
    drawtype = "nodebox",
    paramtype = "light",
    paramtype2 = "facedir",
    node_box = PyuTestCore.node_boxes.PILLAR,
    sounds = PyuTestCore.make_node_sounds(),
  }, econf))
  table.insert(PyuTestCore.building_blocks, id_pillar)
  minetest.register_alias(color.."_pillar", id_pillar)

  minetest.register_craft({
    output = id_carpet .. " 2",
    recipe = {
      {id_block, id_block}
    }
  })

  minetest.register_craft({
    output = id_slab .. " 3",
    recipe = {
      {id_block, id_block, id_block}
    }
  })

  minetest.register_craft({
    output = id_pillar .. " 3",
    recipe = {
      {id_block},
      {id_block},
      {id_block}
    }
  })
end

PyuTestCore.make_liquid = function (nsname, sname, desc, groups, tiles, extra_conf)
  local function make_liquid_flags(liquidtype)
    local drawtype = ""

    if liquidtype == "source" then
      drawtype = "liquid"
    elseif liquidtype == "flowing" then
      drawtype = "liquid"
    end

    local t = PyuTestCore.util.tableconcat({
      drawtype = drawtype,
      waving = 3,
      walkable = false,
      pointable = false,
      buildable_to = true,
      is_ground_content = false,
      use_texture_alpha = "blend",
      paramtype = "light",
      drop = "",
      drowning = 1,
      liquidtype = liquidtype,
      liquid_viscosity = 1,
      liquid_alternative_flowing = nsname.."_flowing",
      liquid_alternative_source = nsname.."_source"
    }, extra_conf or {})
    return t
  end
  groups["liquid"] = 1

  PyuTestCore.make_node(nsname.."_source", sname.."_source", desc .. " Source", groups, tiles, make_liquid_flags("source"))
  PyuTestCore.make_node(nsname.."_flowing", sname.."_flowing", "Flowing " .. desc, groups, tiles, make_liquid_flags("flowing"))
end

PyuTestCore.make_building_blocks("grass", "Grass", {"grass.png"}, nil, nil, {drop = "pyutest_core:dirt_block"})
PyuTestCore.make_building_blocks("dirt", "Dirt", {"dirt.png"}, nil, nil, {
  on_construct = function (pos)
    local timer = minetest.get_node_timer(pos)
    timer:start(8)
  end,

  on_timer = function (pos)
    if minetest.get_node({x = pos.x, y = pos.y + 1, z = pos.z}).name == "air" then
      minetest.set_node(pos, {name = "pyutest_core:grass_block"})
    end
  end,

  on_destruct = function (pos)
    local cpos = {x = pos.x, y = pos.y - 1, z = pos.z}
    if minetest.get_node(cpos).name == "pyutest_core:dirt_block" then
      local timer = minetest.get_node_timer(cpos)
      timer:start(8)
    end
  end
})
PyuTestCore.make_building_blocks("coarse_dirt", "Coarse Dirt", {"dirt.png"}, nil)
PyuTestCore.make_building_blocks("stone", "Stone", {"stone.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_MIDDLE})
PyuTestCore.make_building_blocks("wooden", "Wooden", {"wood.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_CHOPPY})
PyuTestCore.make_building_blocks("snow", "Snow", {"snow.png"}, nil)
PyuTestCore.make_building_blocks("sand", "Sand", {"sand.png"}, nil)
PyuTestCore.make_building_blocks("sandstone", "Sandstone", {"sandstone.png"}, nil)
PyuTestCore.make_building_blocks("ice", "Ice", {"ice.png"}, nil)
PyuTestCore.make_building_blocks("leaves", "Leaves", {"leaves.png"}, nil)
PyuTestCore.make_building_blocks("mushroom", "Mushroom", {"mushroom.png"}, nil)
PyuTestCore.make_building_blocks("mushroom_stem", "Mushroom Stem", {"mushroom-stem.png"}, nil)
PyuTestCore.make_building_blocks("mycelium", "Mycelium", {"mycelium.png"}, nil)
PyuTestCore.make_building_blocks("hellstone", "Hellstone", {"hellstone.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_MIDDLE})
PyuTestCore.make_building_blocks("basalt", "Basalt", {"basalt.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_MIDDLE})
PyuTestCore.make_building_blocks("obsidian", "Obsidian", {"obsidian.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_LONG})
PyuTestCore.make_building_blocks("haybale", "Haybale", {"haybale-top-bottom.png", "haybale-top-bottom.png", "haybale.png"}, nil)
PyuTestCore.make_building_blocks("crying_obsidian", "Crying Obsidian", {"crying-obsidian.png"}, nil, {block = PyuTestCore.BLOCK_BREAKABLE_LONG})

PyuTestCore.make_building_blocks("color_white", "White", {"wool.png"}, "white")
PyuTestCore.make_building_blocks("color_red", "Red", {"wool.png"}, "red")
PyuTestCore.make_building_blocks("color_orange", "Orange", {"wool.png"}, "orange")
PyuTestCore.make_building_blocks("color_yellow", "Yellow", {"wool.png"}, "yellow")
PyuTestCore.make_building_blocks("color_green", "Green", {"wool.png"}, "green")
PyuTestCore.make_building_blocks("color_blue", "Blue", {"wool.png"}, "blue")
PyuTestCore.make_building_blocks("color_purple", "Purple", {"wool.png"}, "purple")
PyuTestCore.make_building_blocks("color_black", "Black", {"wool.png"}, "black")
PyuTestCore.make_building_blocks("color_pink", "Pink", {"wool.png"}, "hotpink")
PyuTestCore.make_building_blocks("color_cherry", "Cherry", {"wool.png"}, "lightpink")
PyuTestCore.make_building_blocks("color_brown", "Brown", {"wool.png"}, "brown")
PyuTestCore.make_building_blocks("color_gray", "Gray", {"wool.png"}, "gray")
PyuTestCore.make_building_blocks("color_teal", "Teal", {"wool.png"}, "teal")
PyuTestCore.make_building_blocks("color_cyan", "Cyan", {"wool.png"}, "cyan")
PyuTestCore.make_building_blocks("color_yellowgreen", "Yellow Green", {"wool.png"}, "yellowgreen")
PyuTestCore.make_building_blocks("color_plum", "Plum", {"wool.png"}, "plum")
PyuTestCore.make_building_blocks("color_gold", "Gold", {"wool.png"}, "gold")
PyuTestCore.make_building_blocks("color_skyblue", "Sky Blue", {"wool.png"}, "skyblue")
PyuTestCore.make_building_blocks("color_darkviolet", "Dark Violet", {"wool.png"}, "darkviolet")
PyuTestCore.make_building_blocks("color_violet", "Violet", {"wool.png"}, "violet")

PyuTestCore.make_node("pyutest_core:light", "light", "Light", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
  light = 1
}, {
  "light.png"
}, {
  drawtype = "torchlike",
  walkable = false,
  paramtype = "light",
  sunlight_propagates = true,
  light_source = minetest.LIGHT_MAX,
  on_rightclick = function ()
    if minetest.get_timeofday() >= 0.5 then
      minetest.set_timeofday(0)
    else
      minetest.set_timeofday(0.5)
    end
  end
})

PyuTestCore.make_node("pyutest_core:torch", "torch", "Torch", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
  light = 1
}, {
  "torch.png"
}, {
  light_source = 12,
  walkable = false,
  drawtype = "torchlike",
  paramtype = "light",
  inventory_image = "torch.png",
})

PyuTestCore.make_node("pyutest_core:sponge", "sponge", "Sponge", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"sponge.png"})

PyuTestCore.make_node("pyutest_core:glass", "glass", "Glass", {
  cracky = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"glass.png"}, {
  drawtype = "glasslike_framed",
  paramtype = "light",
  sunlight_propagates = true
})

PyuTestCore.make_node("pyutest_core:flower", "rose", "Rose", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
}, {"flower.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "flower.png"
})

PyuTestCore.make_node("pyutest_core:flower2", "dandelion", "Dandelion", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
}, {"flower2.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "flower2.png"
})

PyuTestCore.make_node("pyutest_core:flower3", "blue_daisy", "Blue Daisy", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
}, {"flower3.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "flower3.png"
})

PyuTestCore.make_node("pyutest_core:flower4", "lavender", "Lavender", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT,
}, {"flower4.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "flower4.png"
})


PyuTestCore.make_node("pyutest_core:deadbush", "deadbush", "Deadbush", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"deadbush.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "deadbush.png"
})

PyuTestCore.make_node("pyutest_core:grass_plant", "grass_plant", "Grass", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"grass-plant.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "grass-plant.png"
})

PyuTestCore.make_node("pyutest_core:tree_sapling", "tree_sapling", "Tree Sapling", {
  snappy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"sapling.png"}, {
  drawtype = "plantlike",
  walkable = false,
  waving = 1,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "sapling.png",

  on_timer = function (pos)
    local trees = {
      "tree",
      "tree2"
    }

    math.randomseed(os.time())
    local selected_tree = trees[math.random(#trees)]

    minetest.remove_node(pos)
    pos.y = pos.y - 1
    minetest.place_schematic(pos, PyuTestCore.get_schem_path(selected_tree), "random", nil, false, "place_center_x, place_center_z")
  end,

  on_rightclick = function (pos)
    local timer = minetest.get_node_timer(pos)
    timer:start(6)
  end
})

PyuTestCore.make_node("pyutest_core:trapdoor", "trapdoor", "Trapdoor", {
  choppy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_CHOPPY
}, {"trapdoor.png"}, {
  drawtype = "nodebox",
  paramtype = "light",
  sunlight_propagates = true,
  node_box = {
    type = "fixed",
    fixed = {-0.5, -0.5, -0.5, 0.5, -0.15, 0.5}
  }
})

PyuTestCore.make_node("pyutest_core:contagious_acid", "acid", "Contagious Acid", {
  fleshy = 1,
  block = PyuTestCore.BLOCK_BREAKABLE_MIDDLE,
}, {"acid.png"}, {})

PyuTestCore.make_node("pyutest_core:barrier", "barrier", "Barrier", {
  block = PyuTestCore.BLOCK_BREAKABLE_FOREVER
}, {}, {
  drawtype = "airlike",
  walkable = true,
  paramtype = "light",
  sunlight_propagates = true,
  inventory_image = "barrier.png",
  wield_image = "barrier.png"
})

PyuTestCore.make_node("pyutest_core:fire", "fire", "Fire", {
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {"fire.png"}, {
  drawtype = "firelike",
  walkable = false,
  buildable_to = true,
  paramtype = "light",
  sunlight_propagates = true,
  damage_per_second = 1
})

PyuTestCore.make_node("pyutest_core:tnt", "tnt", "TNT", {
  block = PyuTestCore.BLOCK_BREAKABLE_INSTANT
}, {
  "tnt-top-bottom.png",
  "tnt-top-bottom.png",
  "tnt-side.png" -- Affects all other sides
}, {
  on_rightclick = function (pos)
    local timer = minetest.get_node_timer(pos)
    timer:start(4)
  end,

  on_timer = function (pos)
    PyuTestCore.create_explosion(pos, 3, true, 3)
  end
})

PyuTestCore.make_node("pyutest_core:crate", "crate", "Crate", {
  block = PyuTestCore.BLOCK_BREAKABLE_CHOPPY
}, {"crate.png"}, {
  on_construct = function (pos)
    local meta = minetest.get_meta(pos)
    local inventory = meta:get_inventory()
    inventory:set_size("main", 8 * 4)
  end,

  can_dig = function (pos, player)
    local meta = minetest.get_meta(pos)
    local inventory = meta:get_inventory()
    local empty = inventory:is_empty("main")

    if not empty then
      minetest.chat_send_player(player:get_player_name(), "Cannot destroy crate, it's not empty!")
    end

    return empty
  end,

  on_rightclick = function (pos, node, clicker)
    local spos = string.format("%d,%d,%d", pos.x, pos.y, pos.z)
    local formspec =
      "size[8,8]" ..
      "list[nodemeta:"..spos..";main;0,0;8,4;]" ..
      "list[current_player;main;0,5;8,3;]" ..
      "listring[nodemeta:"..spos..";main]" ..
      "listring[current_player;main]"
    minetest.show_formspec(clicker:get_player_name(), string.format("pyutest_core:crate_%d_%d_%d", pos.x, pos.y, pos.z), formspec)
  end
})

PyuTestCore.make_liquid("pyutest_core:water", "water", "Water", {}, {"water.png"})
PyuTestCore.make_liquid("pyutest_core:lava", "lava", "Lava", {}, {"lava.png"}, {
  damage_per_second = 2
})
PyuTestCore.make_liquid("pyutest_core:oil", "oil", "Oil", {}, {"oil.png"})
PyuTestCore.make_liquid("pyutest_core:liquid_acid", "liquid_acid", "Acid", {}, {"acid.png"}, {
  damage_per_second = 2
})