noordstar_dripstone = {
    -- Nodes that the mod should consider as sources to extract water from
    water_nodes =
        { "default:river_water_source"
        , "default:water_source"
        , "mcl_core:water_source"
        , "mclx_core:river_water_source"
        }
    
    -- Nodes that the mod should consider as sources to extract lava from
    , lava_nodes =
        { "default:lava_source"
        , "mcl_core:lava_source"
        }
}

local modpath = minetest.get_modpath(minetest.get_current_modname())

local function load(module_name)
    return dofile(modpath .. "/lua/" .. module_name .. ".lua")
end
local function schem(module_name)
    return dofile(modpath .. "/schematics/" .. module_name .. ".lua")
end

-- Create a node box for any given dripstone size.
-- Size 8 is a normal block size
local function nodebox_of_size(size)
    return {
        type = "fixed",
        fixed = {
            { - size / 16, -0.5, - size / 16, size / 16, 0.5, size / 16 },
        },
    }
end

-- Sounds
local dripstone_sounds = nil
if mcl_sounds then
    dripstone_sounds = mcl_sounds.node_sound_stone_defaults()
end

-- Constants
local speed_factor = 30
local seconds_per_growth = 10 * speed_factor
local seconds_per_water_trickle = 1 * speed_factor
local seconds_per_lava_trickle = 6 * speed_factor
local samples_per_interval = 10

-- Namespaced node names
local dry_dripstone_block = "noordstar_dripstone:dripstone_block"
local dry_dripstone_huge = "noordstar_dripstone:huge_dripstone"
local dry_dripstone_large = "noordstar_dripstone:large_dripstone"
local dry_dripstone_great = "noordstar_dripstone:great_dripstone"
local dry_dripstone_medium = "noordstar_dripstone:medium_dripstone"
local dry_dripstone_small = "noordstar_dripstone:small_dripstone"
local dry_dripstone_tiny = "noordstar_dripstone:tiny_dripstone"
local dry_dripstone_spike = "noordstar_dripstone:dripstone_spike"
local hardened_dripstone_block = "noordstar_dripstone:hardened_dripstone_block"
local hardened_dripstone_huge = "noordstar_dripstone:huge_hardened_dripstone"
local hardened_dripstone_large = "noordstar_dripstone:large_hardened_dripstone"
local hardened_dripstone_great = "noordstar_dripstone:great_hardened_dripstone"
local hardened_dripstone_medium = "noordstar_dripstone:medium_hardened_dripstone"
local hardened_dripstone_small = "noordstar_dripstone:small_hardened_dripstone"
local hardened_dripstone_tiny = "noordstar_dripstone:tiny_hardened_dripstone"
local hardened_dripstone_spike = "noordstar_dripstone:hardened_dripstone_spike"
local molten_dripstone_block = "noordstar_dripstone:molten_dripstone_block"
local molten_dripstone_huge = "noordstar_dripstone:huge_molten_dripstone"
local molten_dripstone_large = "noordstar_dripstone:large_molten_dripstone"
local molten_dripstone_great = "noordstar_dripstone:great_molten_dripstone"
local molten_dripstone_medium = "noordstar_dripstone:medium_molten_dripstone"
local molten_dripstone_small = "noordstar_dripstone:small_molten_dripstone"
local molten_dripstone_tiny = "noordstar_dripstone:tiny_molten_dripstone"
local molten_dripstone_spike = "noordstar_dripstone:molten_dripstone_spike"
local watered_dripstone_block = "noordstar_dripstone:watered_dripstone_block"
local watered_dripstone_huge = "noordstar_dripstone:huge_watered_dripstone"
local watered_dripstone_large = "noordstar_dripstone:large_watered_dripstone"
local watered_dripstone_great = "noordstar_dripstone:great_watered_dripstone"
local watered_dripstone_medium = "noordstar_dripstone:medium_watered_dripstone"
local watered_dripstone_small = "noordstar_dripstone:small_watered_dripstone"
local watered_dripstone_tiny = "noordstar_dripstone:tiny_watered_dripstone"
local watered_dripstone_spike = "noordstar_dripstone:watered_dripstone_spike"

-- Trickle down config

local lava_trickle_down = {
    { from = dry_dripstone_block, to = molten_dripstone_block },
    { from = dry_dripstone_huge, to = molten_dripstone_huge },
    { from = dry_dripstone_large, to = molten_dripstone_large },
    { from = dry_dripstone_great, to = molten_dripstone_great },
    { from = dry_dripstone_medium, to = molten_dripstone_medium },
    { from = dry_dripstone_small, to = molten_dripstone_small },
    { from = dry_dripstone_tiny, to = molten_dripstone_tiny },
    { from = dry_dripstone_spike, to = molten_dripstone_spike },
    { from = watered_dripstone_block, to = hardened_dripstone_block },
    { from = watered_dripstone_huge, to = hardened_dripstone_huge },
    { from = watered_dripstone_large, to = hardened_dripstone_large },
    { from = watered_dripstone_great, to = hardened_dripstone_great },
    { from = watered_dripstone_medium, to = hardened_dripstone_medium },
    { from = watered_dripstone_small, to = hardened_dripstone_small },
    { from = watered_dripstone_tiny, to = hardened_dripstone_tiny },
    { from = watered_dripstone_spike, to = hardened_dripstone_spike },
    { from = "air", to = dry_dripstone_spike },
}
local water_trickle_down = {
    { from = dry_dripstone_block, to = watered_dripstone_block },
    { from = dry_dripstone_huge, to = watered_dripstone_huge },
    { from = dry_dripstone_large, to = watered_dripstone_large },
    { from = dry_dripstone_great, to = watered_dripstone_great },
    { from = dry_dripstone_medium, to = watered_dripstone_medium },
    { from = dry_dripstone_small, to = watered_dripstone_small },
    { from = dry_dripstone_tiny, to = watered_dripstone_tiny },
    { from = dry_dripstone_spike, to = watered_dripstone_spike },
    { from = molten_dripstone_block, to = hardened_dripstone_block },
    { from = molten_dripstone_huge, to = hardened_dripstone_huge },
    { from = molten_dripstone_large, to = hardened_dripstone_large },
    { from = molten_dripstone_great, to = hardened_dripstone_great },
    { from = molten_dripstone_medium, to = hardened_dripstone_medium },
    { from = molten_dripstone_small, to = hardened_dripstone_small },
    { from = molten_dripstone_tiny, to = hardened_dripstone_tiny },
    { from = molten_dripstone_spike, to = hardened_dripstone_spike },
    { from = "air", to = dry_dripstone_spike },
}

local lava_trickle_down_spike = {
    { from = dry_dripstone_block, to = molten_dripstone_block },
    { from = dry_dripstone_huge, to = molten_dripstone_huge },
    { from = dry_dripstone_large, to = molten_dripstone_large },
    { from = dry_dripstone_great, to = molten_dripstone_great },
    { from = dry_dripstone_medium, to = molten_dripstone_medium },
    { from = dry_dripstone_small, to = molten_dripstone_small },
    { from = dry_dripstone_tiny, to = molten_dripstone_tiny },
    { from = dry_dripstone_spike, to = molten_dripstone_spike },
    { from = watered_dripstone_block, to = hardened_dripstone_block },
    { from = watered_dripstone_huge, to = hardened_dripstone_huge },
    { from = watered_dripstone_large, to = hardened_dripstone_large },
    { from = watered_dripstone_great, to = hardened_dripstone_great },
    { from = watered_dripstone_medium, to = hardened_dripstone_medium },
    { from = watered_dripstone_small, to = hardened_dripstone_small },
    { from = watered_dripstone_tiny, to = hardened_dripstone_tiny },
    { from = watered_dripstone_spike, to = hardened_dripstone_spike },
}
local water_trickle_down_spike = {
    { from = dry_dripstone_block, to = watered_dripstone_block },
    { from = dry_dripstone_huge, to = watered_dripstone_huge },
    { from = dry_dripstone_large, to = watered_dripstone_large },
    { from = dry_dripstone_great, to = watered_dripstone_great },
    { from = dry_dripstone_medium, to = watered_dripstone_medium },
    { from = dry_dripstone_small, to = watered_dripstone_small },
    { from = dry_dripstone_tiny, to = watered_dripstone_tiny },
    { from = dry_dripstone_spike, to = watered_dripstone_spike },
    { from = molten_dripstone_block, to = hardened_dripstone_block },
    { from = molten_dripstone_huge, to = hardened_dripstone_huge },
    { from = molten_dripstone_large, to = hardened_dripstone_large },
    { from = molten_dripstone_great, to = hardened_dripstone_great },
    { from = molten_dripstone_medium, to = hardened_dripstone_medium },
    { from = molten_dripstone_small, to = hardened_dripstone_small },
    { from = molten_dripstone_tiny, to = hardened_dripstone_tiny },
    { from = molten_dripstone_spike, to = hardened_dripstone_spike },
}

local lava_drop_down = {
    { from = dry_dripstone_spike, to = molten_dripstone_spike },
    { from = "mcl_cauldrons:cauldron", to = "mcl_cauldrons:cauldron_1_lava" },
    { from = "mcl_cauldrons:cauldron_1_lava", to = "mcl_cauldrons:cauldron_2_lava" },
    { from = "mcl_cauldrons:cauldron_2_lava", to = "mcl_cauldrons:cauldron_3_lava" },
}
local water_drop_down = {
    { from = dry_dripstone_spike, to = watered_dripstone_spike },
    { from = "mcl_cauldrons:cauldron", to = "mcl_cauldrons:cauldron_1" },
    { from = "mcl_cauldrons:cauldron_1", to = "mcl_cauldrons:cauldron_2" },
    { from = "mcl_cauldrons:cauldron_2", to = "mcl_cauldrons:cauldron_3" },
}

-- Tiles for dripstone
local dry_dripstone_tiles =
    { "noordstar_dripstone_dripstone_top.png"
    , "noordstar_dripstone_dripstone_top.png"
    , "noordstar_dripstone_dripstone_side.png"
    }
local hardened_dripstone_tiles =
    { "noordstar_dripstone_hardened_dripstone_top.png"
    , "noordstar_dripstone_hardened_dripstone_top.png"
    , "noordstar_dripstone_hardened_dripstone_side.png"
    }
local molten_dripstone_tiles =
    { "noordstar_dripstone_molten_dripstone_top.png"
    , "noordstar_dripstone_molten_dripstone_top.png"
    , "noordstar_dripstone_molten_dripstone_side.png"
    }
local watered_dripstone_tiles =
    { "noordstar_dripstone_watered_dripstone_top.png"
    , "noordstar_dripstone_watered_dripstone_top.png"
    , "noordstar_dripstone_watered_dripstone_side.png"
    }

-- BASE BLOCKS
-- These blocks are able to absorb water or lava from above them.

minetest.register_node(dry_dripstone_block,
    { description = "Dripstone block"
    , _doc_items_longdesc = "Dripstone block that can suck up liquids above it and creates stalactites below it."
    , tiles = dry_dripstone_tiles
    , drawtype = "normal"
    , groups = { pickaxey=2, material_stone=1 }
    , is_ground_content = true
    , drop = dry_dripstone_spike
    , sounds = dripstone_sounds
    , _mcl_hardness = 2
    , _mcl_blast_resistance = 5
    , _mcl_silk_touch_drop = true
    }
)
minetest.register_node(hardened_dripstone_block,
    { description = "Hardened dripstone block"
    , _doc_items_longdesc = "Dripstone block that is no longer able to absorb liquids above it."
    , tiles = hardened_dripstone_tiles
    , drawtype = "normal"
    , groups = { pickaxey=2, material_stone=1 }
    , is_ground_content = true
    , drop = dry_dripstone_spike
    , sounds = dripstone_sounds
    , _mcl_hardness = 2
    , _mcl_blast_resistance = 5
    , _mcl_silk_touch_drop = true
    }
)
minetest.register_node(molten_dripstone_block,
    { description = "Molten dripstone block"
    , _doc_items_longdesc = "A dripstone block that has absorbed some lava, allowing it to form a stalactite."
    , tiles = molten_dripstone_tiles
    , drawtype = "normal"
    , groups = { pickaxey=2, material_stone=1 }
    , is_ground_content = true
    , drop = dry_dripstone_spike
    , sounds = dripstone_sounds
    , _mcl_hardness = 2
    , _mcl_blast_resistance = 5
    , _mcl_silk_touch_drop = true
    }
)
minetest.register_node(watered_dripstone_block,
    { description = "Watered dripstone block"
    , _doc_items_longdesc = "A dripstone block that has absorbed some water, allowing it to form a stalactite."
    , tiles = watered_dripstone_tiles
    , drawtype = "normal"
    , groups = { pickaxey=2, material_stone=1 }
    , is_ground_content = true
    , drop = dry_dripstone_spike
    , sounds = dripstone_sounds
    , _mcl_hardness = 2
    , _mcl_blast_resistance = 5
    , _mcl_silk_touch_drop = true
    }
)

local function make_dripstone(name, desc, longdesc, tiles, drop, size)
    minetest.register_node(name,
        { description = desc
        , _doc_items_longdesc = longdesc
        , tiles = tiles
        , groups = { pickaxey=2, material_stone=1, fall_damage_add_percent = math.max(4 - size, 0) / 4 * 100 }
        , is_ground_content = true
        , drop = {
            max_items = math.floor((size + 1) / 2),
            items = {
                { rarity = 1
                , items = { drop }
                },
                { rarity = 2
                , items = { drop }
                },
                { rarity = 4
                , items = { drop }
                },
                { rarity = 4
                , items = { drop }
                },
            }
        }
        , sounds = dripstone_sounds
        , drawtype = "nodebox"
        , paramtype = "light"
        , sunlight_propagates = true
        , node_box = nodebox_of_size(size)
        , _mcl_hardness = 1.0 + size / 8
        , _mcl_blast_resistance = 1 + size / 2
        , _mcl_silk_touch_drop = true
        }
    )
end

-- HUGE DRIPSTONE
-- This is the largest form a non-block can get.

make_dripstone(
    dry_dripstone_huge,
    "Huge dripstone",
    "Dripstone in the largest shape it can reach.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    7
)
make_dripstone(
    hardened_dripstone_huge,
    "Huge hardened dripstone",
    "Dripstone in the largest shape it can reach. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    7
)
make_dripstone(
    molten_dripstone_huge,
    "Huge molten dripstone",
    "Dripstone in the largest shape it can reach. It has absorbed some lava, but it can no longer grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    7
)
make_dripstone(
    watered_dripstone_huge,
    "Huge watered dripstone",
    "Dripstone in the largest shape it can reach. It has absorbed some water, but it can no longer grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    7
)

-- LARGE DRIPSTONE

make_dripstone(
    dry_dripstone_large,
    "Large dripstone",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    6
)
make_dripstone(
    hardened_dripstone_large,
    "Large hardened dripstone",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    6
)
make_dripstone(
    molten_dripstone_large,
    "Large molten dripstone",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    6
)
make_dripstone(
    watered_dripstone_large,
    "Large watered dripstone",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    6
)

-- GREAT DRIPSTONE

make_dripstone(
    dry_dripstone_great,
    "Great dripstone",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    5
)
make_dripstone(
    hardened_dripstone_great,
    "Great hardened dripstone",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    5
)
make_dripstone(
    molten_dripstone_great,
    "Great molten dripstone",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    5
)
make_dripstone(
    watered_dripstone_great,
    "Great watered dripstone",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    5
)

-- MEDIUM DRIPSTONE

make_dripstone(
    dry_dripstone_medium,
    "Medium dripstone",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    4
)
make_dripstone(
    hardened_dripstone_medium,
    "Medium hardened dripstone",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    4
)
make_dripstone(
    molten_dripstone_medium,
    "Medium molten dripstone",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    4
)
make_dripstone(
    watered_dripstone_medium,
    "Medium watered dripstone",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    4
)

-- SMALL DRIPSTONE

make_dripstone(
    dry_dripstone_small,
    "Small dripstone",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    3
)
make_dripstone(
    hardened_dripstone_small,
    "Small hardened dripstone",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    3
)
make_dripstone(
    molten_dripstone_small,
    "Small molten dripstone",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    3
)
make_dripstone(
    watered_dripstone_small,
    "Small watered dripstone",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    3
)

-- TINY DRIPSTONE

make_dripstone(
    dry_dripstone_tiny,
    "Tiny dripstone",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    2
)
make_dripstone(
    hardened_dripstone_tiny,
    "Tiny hardened dripstone",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    2
)
make_dripstone(
    molten_dripstone_tiny,
    "Tiny molten dripstone",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    2
)
make_dripstone(
    watered_dripstone_tiny,
    "Tiny watered dripstone",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    2
)

-- DRIPSTONE SPIKE

make_dripstone(
    dry_dripstone_spike,
    "Dripstone spike",
    "A thick layer of dripstone.",
    dry_dripstone_tiles,
    dry_dripstone_spike,
    1
)
make_dripstone(
    hardened_dripstone_spike,
    "Hardened dripstone spike",
    "A thick layer of dripstone. It is no longer able to grow or absorb liquids.",
    hardened_dripstone_tiles,
    hardened_dripstone_spike,
    1
)
make_dripstone(
    molten_dripstone_spike,
    "Molten dripstone spike",
    "A thick layer of dripstone. It has absorbed some lava, so it is able to grow in thickness.",
    molten_dripstone_tiles,
    dry_dripstone_spike,
    1
)
make_dripstone(
    watered_dripstone_spike,
    "Watered dripstone spike",
    "A thick layer of dripstone. It has absorbed some water, so it is able to grow in thickness.",
    watered_dripstone_tiles,
    dry_dripstone_spike,
    1
)

-- ACTIONS

local function absorb_liquid(pos, node, aoc, aocw)
    local node_above = minetest.get_node({ x = pos.x, y = pos.y + 1, z = pos.z }) or {}
    local na_name = node_above.name

    for _, water in pairs(noordstar_dripstone.water_nodes) do
        if water == na_name then
            -- Make block watery
            node.name = watered_dripstone_block
            minetest.set_node(pos, node)
            return
        end
    end

    for _, lava in pairs(noordstar_dripstone.lava_nodes) do
        if lava == na_name then
            -- Make block molten
            node.name = molten_dripstone_block
            minetest.set_node(pos, node)
            return
        end
    end
end

local function drop_down_to(options, dry_up_node_name)
    return function(pos, node, aoc, aocw)
        for i = 1, 25 do
            local pos_rel = { x = pos.x, y = pos.y - i, z = pos.z }
            local node_rel = minetest.get_node(pos_rel) or {}
            local node_name = node_rel.name or ""

            if node_name == "air" then
            else
                -- Non-air node has been found!
                -- Check if it reacts to the dripstone and if it can be
                -- activated.
                for _, option in pairs(options) do
                    if node_name == option.from then
                        node_rel.name = option.to
                        node.name = dry_up_node_name

                        minetest.set_node(pos, node)
                        minetest.set_node(pos_rel, node_rel)
                        return
                    end
                end

                -- The node cannot be changed and hence a new spike starts on top
                -- of it.
                if i > 1 then
                    pos_rel = { x = pos.x, y = pos.y - i + 1, z = pos.z }
                    minetest.set_node(pos_rel, { name = dry_dripstone_spike })

                    node.name = dry_up_node_name
                    minetest.set_node(pos, node)
                end
                return
            end
        end
    end
end

local function grow_to(dry_grown_node_name)
    return function(pos, node, aoc, aocw)
        node.name = dry_grown_node_name
        minetest.set_node(pos, node)
    end
end

local function harden(harden_nodes_func)
    return function(pos, node, aoc, aocw)
        local node_above = minetest.get_node({ x = pos.x, y = pos.y + 1, z = pos.z }) or {}
        local na_name = node_above.name

        for _, hardener in pairs(harden_nodes_func()) do
            if hardener == na_name then
                -- Harden dripstone block
                node.name = hardened_dripstone_block
                minetest.set_node(pos, node)
                return
            end
        end
    end
end

local function trickle_down(options, dry_up_node_name)
    return function(pos, node, aoc, aocw)
        local pos_below = { x = pos.x, y = pos.y - 1, z = pos.z }
        local node_below = minetest.get_node(pos_below) or {}
        local nb_name = node_below.name or ""

        for _, option in pairs(options) do
            local expected_node_name = option.from or nil
            local resulted_node_name = option.to

            if nb_name == expected_node_name then
                node.name = dry_up_node_name
                node_below.name = resulted_node_name

                minetest.set_node(pos, node)
                minetest.set_node(pos_below, node_below)
                return
            end
        end
    end
end

local function make_abm(nodename, expected_duration, action)
    minetest.register_abm(
        { nodenames = { nodename }
        , interval = expected_duration / samples_per_interval
        , chance = samples_per_interval
        , catch_up = true
        , action = action
    }
)
end

-- ABSORB LIQUIDS

make_abm(dry_dripstone_block, seconds_per_water_trickle, absorb_liquid)
make_abm(molten_dripstone_block, seconds_per_lava_trickle, harden(function ()
    return noordstar_dripstone.water_nodes
end))
make_abm(watered_dripstone_block, seconds_per_water_trickle, harden(function ()
    return noordstar_dripstone.lava_nodes
end))

-- TRICKLE DOWN

make_abm(molten_dripstone_block, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_block))
make_abm(watered_dripstone_block, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_block))
make_abm(molten_dripstone_huge, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_huge))
make_abm(watered_dripstone_huge, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_huge))
make_abm(molten_dripstone_large, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_large))
make_abm(watered_dripstone_large, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_large))
make_abm(molten_dripstone_great, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_great))
make_abm(watered_dripstone_great, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_great))
make_abm(molten_dripstone_medium, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_medium))
make_abm(watered_dripstone_medium, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_medium))
make_abm(molten_dripstone_small, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_small))
make_abm(watered_dripstone_small, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_small))
make_abm(molten_dripstone_tiny, seconds_per_lava_trickle, trickle_down(lava_trickle_down, dry_dripstone_tiny))
make_abm(watered_dripstone_tiny, seconds_per_water_trickle, trickle_down(water_trickle_down, dry_dripstone_tiny))
make_abm(molten_dripstone_spike, seconds_per_lava_trickle, trickle_down(lava_trickle_down_spike, dry_dripstone_spike))
make_abm(watered_dripstone_spike, seconds_per_water_trickle, trickle_down(water_trickle_down_spike, dry_dripstone_spike))

-- GROW

make_abm(molten_dripstone_large, seconds_per_growth*(14*14 - 12*12), grow_to(dry_dripstone_huge))
make_abm(watered_dripstone_large, seconds_per_growth*(14*14 - 12*12), grow_to(dry_dripstone_huge))
make_abm(molten_dripstone_great, seconds_per_growth*(12*12 - 10*10), grow_to(dry_dripstone_large))
make_abm(watered_dripstone_great, seconds_per_growth*(12*12 - 10*10), grow_to(dry_dripstone_large))
make_abm(molten_dripstone_medium, seconds_per_growth*(10*10 - 8*8), grow_to(dry_dripstone_great))
make_abm(watered_dripstone_medium, seconds_per_growth*(10*10 - 8*8), grow_to(dry_dripstone_great))
make_abm(molten_dripstone_small, seconds_per_growth*(8*8 - 6*6), grow_to(dry_dripstone_medium))
make_abm(watered_dripstone_small, seconds_per_growth*(8*8 - 6*6), grow_to(dry_dripstone_medium))
make_abm(molten_dripstone_tiny, seconds_per_growth*(6*6 - 4*4), grow_to(dry_dripstone_small))
make_abm(watered_dripstone_tiny, seconds_per_growth*(6*6 - 4*4), grow_to(dry_dripstone_small))
make_abm(molten_dripstone_spike, seconds_per_growth*(4*4 - 2*2), grow_to(dry_dripstone_tiny))
make_abm(watered_dripstone_spike, seconds_per_growth*(4*4 - 2*2), grow_to(dry_dripstone_tiny))

-- DROP DOWN

make_abm(molten_dripstone_spike, seconds_per_lava_trickle, drop_down_to(lava_drop_down, dry_dripstone_spike))
make_abm(watered_dripstone_spike, seconds_per_water_trickle, drop_down_to(water_drop_down, dry_dripstone_spike))

-- CRATING RECIPES

local function gapple_recipe(gold, apple, gapple)
    minetest.register_craft({
        output = gapple,
        recipe = {
            { gold,  gold, gold },
            { gold, apple, gold },
            { gold,  gold, gold },
        }
    })
end

gapple_recipe(dry_dripstone_spike, dry_dripstone_spike, dry_dripstone_tiny)
gapple_recipe(dry_dripstone_spike, dry_dripstone_tiny, dry_dripstone_small)
gapple_recipe(dry_dripstone_spike, dry_dripstone_small, dry_dripstone_medium)
gapple_recipe(dry_dripstone_spike, dry_dripstone_medium, dry_dripstone_great)
gapple_recipe(dry_dripstone_spike, dry_dripstone_great, dry_dripstone_large)
gapple_recipe(dry_dripstone_spike, dry_dripstone_large, dry_dripstone_huge)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_spike, hardened_dripstone_tiny)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_tiny, hardened_dripstone_small)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_small, hardened_dripstone_medium)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_medium, hardened_dripstone_great)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_great, hardened_dripstone_large)
gapple_recipe(hardened_dripstone_spike, hardened_dripstone_large, hardened_dripstone_huge)
gapple_recipe(molten_dripstone_spike, molten_dripstone_spike, molten_dripstone_tiny)
gapple_recipe(molten_dripstone_spike, molten_dripstone_tiny, molten_dripstone_small)
gapple_recipe(molten_dripstone_spike, molten_dripstone_small, molten_dripstone_medium)
gapple_recipe(molten_dripstone_spike, molten_dripstone_medium, molten_dripstone_great)
gapple_recipe(molten_dripstone_spike, molten_dripstone_great, molten_dripstone_large)
gapple_recipe(molten_dripstone_spike, molten_dripstone_large, molten_dripstone_huge)
gapple_recipe(watered_dripstone_spike, watered_dripstone_spike, watered_dripstone_tiny)
gapple_recipe(watered_dripstone_spike, watered_dripstone_tiny, watered_dripstone_small)
gapple_recipe(watered_dripstone_spike, watered_dripstone_small, watered_dripstone_medium)
gapple_recipe(watered_dripstone_spike, watered_dripstone_medium, watered_dripstone_great)
gapple_recipe(watered_dripstone_spike, watered_dripstone_great, watered_dripstone_large)
gapple_recipe(watered_dripstone_spike, watered_dripstone_large, watered_dripstone_huge)