vines = {
	name = 'vines',
	recipes = {}
}

local enable_vines = minetest.settings:get_bool("vines_enable_vines", true)
local enable_rope = minetest.settings:get_bool("vines_enable_rope", true)
local enable_roots = minetest.settings:get_bool("vines_enable_roots", true)
local enable_standard = minetest.settings:get_bool("vines_enable_standard", true)
local enable_side = minetest.settings:get_bool("vines_enable_side", true)
local enable_jungle = minetest.settings:get_bool("vines_enable_jungle", true)
local enable_willow = minetest.settings:get_bool("vines_enable_willow", true)

local rarity_roots = tonumber(minetest.settings:get("vines_rarity_roots")) or 0.5
local default_rarity = 0.2
local rarity_standard = tonumber(minetest.settings:get("vines_rarity_standard")) or default_rarity
local rarity_side = tonumber(minetest.settings:get("vines_rarity_side")) or default_rarity
local rarity_jungle = tonumber(minetest.settings:get("vines_rarity_jungle")) or default_rarity
local rarity_willow = tonumber(minetest.settings:get("vines_rarity_willow")) or default_rarity

local growth_min = tonumber(minetest.settings:get("vines_growth_min")) or 180
local growth_max = tonumber(minetest.settings:get("vines_growth_max")) or 360

-- support for i18n
local S = minetest.get_translator("vines")

local dids = {}
local spawn_funcs = {}

local function find_open_side(pos) -- copied from biome_lib
	if minetest.get_node({ x=pos.x-1, y=pos.y, z=pos.z }).name == "air" then
		return {newpos = { x=pos.x-1, y=pos.y, z=pos.z }, facedir = 2}
	end
	if minetest.get_node({ x=pos.x+1, y=pos.y, z=pos.z }).name == "air" then
		return {newpos = { x=pos.x+1, y=pos.y, z=pos.z }, facedir = 3}
	end
	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z-1 }).name == "air" then
		return {newpos = { x=pos.x, y=pos.y, z=pos.z-1 }, facedir = 4}
	end
	if minetest.get_node({ x=pos.x, y=pos.y, z=pos.z+1 }).name == "air" then
		return {newpos = { x=pos.x, y=pos.y, z=pos.z+1 }, facedir = 5}
	end
	return nil
end

-- ITEMS

if enable_vines ~= false then
	minetest.register_craftitem("vines:vines", {
		description = S("Vines"),
		inventory_image = "vines_item.png",
		groups = {vines = 1, flammable = 2}
	})
end

-- FUNCTIONS

local function on_dig(pos, node, player)
	if not player or minetest.is_protected(pos, player:get_player_name()) then
		return
	end
	local vine_name_end = node.name:gsub("_middle", "_end")
	local drop_item = "vines:vines"
	if enable_vines == false then
		drop_item = vine_name_end
	end

	local wielded_item = minetest.is_player(player) and player:get_wielded_item()
	if wielded_item then
		local node_def = minetest.registered_nodes[node.name]
		local dig_params = minetest.get_dig_params(
			node_def.groups,
			wielded_item:get_tool_capabilities(),
			wielded_item:get_wear()
		)
		if dig_params.wear then
			wielded_item:add_wear(dig_params.wear)
			player:set_wielded_item(wielded_item)
		end

		if wielded_item:get_name() == 'vines:shears' then
			drop_item = vine_name_end
		end
	end

	local break_pos = {x = pos.x, y = pos.y, z = pos.z}
	while minetest.get_item_group(minetest.get_node(break_pos).name, "vines") > 0 do
		minetest.remove_node(break_pos)
		minetest.handle_node_drops(break_pos, {drop_item}, player)
		break_pos.y = break_pos.y - 1
	end
end

local function ensure_vine_end(pos, oldnode)
	local np = {x = pos.x, y = pos.y + 1, z = pos.z}
	local nn = minetest.get_node(np)

	local vine_name_end = oldnode.name:gsub("_middle", "_end")

	if minetest.get_item_group(nn.name, "vines") > 0 then
		minetest.swap_node(np, { name = vine_name_end, param2 = oldnode.param2 })
		minetest.registered_items[vine_name_end].on_construct(np, minetest.get_node(np))
	end
end


vines.register_vine = function( name, defs, def )

	local groups = {vines = 1, snappy = 3, flammable = 2}
	local vine_name_end = 'vines:' .. name .. '_end'
	local vine_name_middle = 'vines:' .. name .. '_middle'
	local vine_image_end = "vines_" .. name .. "_end.png"
	local vine_image_middle = "vines_" .. name .. "_middle.png"

	local spawn_plants = function(pos)
		local param2 = 0

		if def.spawn_on_bottom then -- spawn under e.g. leaves
			local newpos = vector.new(pos.x, pos.y - 1, pos.z)
			if minetest.get_node(pos).name ~= "air" and minetest.get_node(newpos).name == "air" then
				-- (1) prevent floating vines; (2) is there even space?
				pos = newpos
			else
				return
			end
		elseif def.spawn_on_side then
			local onside = find_open_side(pos)
			if onside then
				pos = onside.newpos
				param2 = onside.facedir
			else
				return
			end
		end

		local max_length = math.random(defs.average_length)
		local current_length = 1
		-- print("Generate " .. name .. " at " .. minetest.pos_to_string(pos))
		if minetest.get_node({ x=pos.x, y=pos.y - 1, z=pos.z }).name == 'air' then
			while minetest.get_node({ x=pos.x, y=pos.y - 1, z=pos.z }).name == 'air' and current_length < max_length do
				minetest.set_node(pos, { name = vine_name_middle, param2 = param2 })
				pos.y = pos.y - 1
				current_length = current_length + 1
			end
			minetest.set_node(pos, { name = vine_name_end, param2 = param2 })
		end
	end

	local selection_box = {type = "wallmounted",}
	local drawtype = 'signlike'

	-- different properties for bottom and side vines.
	if not def.spawn_on_side then

		selection_box = {
			type = "fixed", fixed = { -0.4, -1/2, -0.4, 0.4, 1/2, 0.4 }
		}

		drawtype = 'plantlike'
	end

	minetest.register_node(vine_name_end, {
		description = defs.description,
		walkable = false,
		climbable = true,
		wield_image = vine_image_end,
		drop = {},
		sunlight_propagates = true,
		paramtype = "light",
		paramtype2 = "wallmounted",
		buildable_to = false,
		tiles = {vine_image_end .. (drawtype == "plantlike" and "^[transformR180" or "")},
		drawtype = drawtype,
		inventory_image = vine_image_end,
		groups = groups,
		sounds = default.node_sound_leaves_defaults(),
		selection_box = selection_box,

		on_construct = function(pos)

			local timer = minetest.get_node_timer(pos)
			timer:start(math.random(growth_min, growth_max))
		end,

		on_timer = function(pos)

			local node = minetest.get_node(pos)
			local bottom = {x = pos.x, y = pos.y - 1, z = pos.z}
			local bottom_node = minetest.get_node( bottom )
			if bottom_node.name == "air" then

				if math.random(defs.average_length) ~= 1 then

					minetest.swap_node(pos, {
							name = vine_name_middle, param2 = node.param2})

					minetest.set_node(bottom, {
							name = node.name, param2 = node.param2})

					local timer = minetest.get_node_timer(bottom_node)

					timer:start(math.random(growth_min, growth_max))
				end
			end
		end,

		on_dig = on_dig,

		after_destruct = function(pos, oldnode)
			ensure_vine_end(pos, oldnode)
		end,
	})

	minetest.register_node( vine_name_middle, {
		description = S("Matured") .. " " .. defs.description,
		walkable = false,
		climbable = true,
		drop = {},
		sunlight_propagates = true,
		paramtype = "light",
		paramtype2 = "wallmounted",
		buildable_to = false,
		tiles = {vine_image_middle},
		wield_image = vine_image_middle,
		drawtype = drawtype,
		inventory_image = vine_image_middle,
		groups = groups,
		sounds = default.node_sound_leaves_defaults(),
		selection_box = selection_box,

		on_dig = on_dig,

		after_destruct = function(pos, oldnode)
			ensure_vine_end(pos, oldnode)
		end,
	})

	minetest.register_decoration({
		name = "vines:" .. name,
		decoration = {"air"},
		fill_ratio = def.rarity,
		y_min = -16,
		y_max = 48,
		place_on = def.place_on,
		deco_type = "simple",
		flags = "all_floors, all_ceilings"
	})
	dids[#dids + 1] = {name = name, spawn_func = spawn_plants}
end

minetest.register_on_mods_loaded(function()
	for idx, def in ipairs(dids) do
		local did = minetest.get_decoration_id("vines:" .. def.name)
		dids[idx] = did
		spawn_funcs[did] = def.spawn_func
	end

	minetest.set_gen_notify("decoration", dids)
end)

minetest.register_on_generated(function(minp, maxp, blockseed)
	local g = minetest.get_mapgen_object("gennotify")

	for _, did in ipairs(dids) do
		local deco_locations = g["decoration#" .. did]

		if deco_locations then
			local func = spawn_funcs[did]
			for _, pos in pairs(deco_locations) do
				func(pos)
			end
		end
	end
end)

-- ALIASES

-- used to remove the old vine nodes and give room for the new.
minetest.register_alias( 'vines:root', 'air' )
minetest.register_alias( 'vines:root_rotten', 'air' )
minetest.register_alias( 'vines:vine', 'air' )
minetest.register_alias( 'vines:vine_rotten', 'air' )
minetest.register_alias( 'vines:side', 'air' )
minetest.register_alias( 'vines:side_rotten', 'air' )
minetest.register_alias( 'vines:jungle', 'air' )
minetest.register_alias( 'vines:jungle_rotten', 'air' )
minetest.register_alias( 'vines:willow', 'air' )
minetest.register_alias( 'vines:willow_rotten', 'air' )


-- ROPE
if enable_rope ~= false then
	minetest.register_craft({
		output = 'vines:rope_block',
		recipe = {
			{'group:vines', 'group:vines', 'group:vines'},
			{'group:vines', 'group:wood', 'group:vines'},
			{'group:vines', 'group:vines', 'group:vines'},
		}
	})

	if minetest.get_modpath("moreblocks") then
		minetest.register_craft({
			output = 'vines:rope_block',
			recipe = {
				{'moreblocks:rope', 'moreblocks:rope', 'moreblocks:rope'},
				{'moreblocks:rope', 'group:wood', 'moreblocks:rope'},
				{'moreblocks:rope', 'moreblocks:rope', 'moreblocks:rope'},
			}
		})
	end

	minetest.register_node("vines:rope_block", {
		description = S("Rope"),
		sunlight_propagates = true,
		paramtype = "light",
		tiles = {
			"default_wood.png^vines_rope.png",
			"default_wood.png^vines_rope.png",
			"default_wood.png",
			"default_wood.png",
			"default_wood.png^vines_rope.png",
			"default_wood.png^vines_rope.png",
		},
		groups = {flammable = 2, choppy = 2, oddly_breakable_by_hand = 1},

		after_place_node = function(pos)

			local p = {x = pos.x, y = pos.y - 1, z = pos.z}
			local n = minetest.get_node(p)

			if n.name == "air" then
				minetest.add_node(p, {name = "vines:rope_end"})
			end
		end,

		after_dig_node = function(pos, node, digger)

			local p = {x = pos.x, y = pos.y - 1, z = pos.z}
			local n = minetest.get_node(p)

			while n.name == 'vines:rope' or n.name == 'vines:rope_end' do

				minetest.remove_node(p)

				p = {x = p.x, y = p.y - 1, z = p.z}
				n = minetest.get_node(p)
			end
		end
	})

	minetest.register_node("vines:rope", {
		description = S("Rope"),
		walkable = false,
		climbable = true,
		sunlight_propagates = true,
		paramtype = "light",
		drop = {},
		tiles = {"vines_rope.png"},
		drawtype = "plantlike",
		groups = {flammable = 2, not_in_creative_inventory = 1},
		sounds = default.node_sound_leaves_defaults(),
		selection_box = {
			type = "fixed",
			fixed = {-1/7, -1/2, -1/7, 1/7, 1/2, 1/7},
		},
	})

	minetest.register_node("vines:rope_end", {
		description = S("Rope"),
		walkable = false,
		climbable = true,
		sunlight_propagates = true,
		paramtype = "light",
		drop = {},
		tiles = {"vines_rope_end.png"},
		drawtype = "plantlike",
		groups = {flammable = 2, not_in_creative_inventory = 1},
		sounds = default.node_sound_leaves_defaults(),

		after_place_node = function(pos)

			local yesh = {x = pos.x, y = pos.y - 1, z = pos.z}

			minetest.add_node(yesh, {name = "vines:rope"})
		end,

		selection_box = {
			type = "fixed",
			fixed = {-1/7, -1/2, -1/7, 1/7, 1/2, 1/7},
		},

		on_construct = function(pos)

			local timer = minetest.get_node_timer(pos)

			timer:start(1)
		end,

		on_timer = function( pos, elapsed )

			local p = {x = pos.x, y = pos.y - 1, z = pos.z}
			local n = minetest.get_node(p)

			if	n.name == "air" then

				minetest.set_node(pos, {name = "vines:rope"})
				minetest.add_node(p, {name = "vines:rope_end"})
			else

				local timer = minetest.get_node_timer(pos)

				timer:start(1)
			end
		end
	})
end

-- SHEARS
minetest.register_tool("vines:shears", {
	description = S("Shears"),
	inventory_image = "vines_shears.png",
	wield_image = "vines_shears.png",
	stack_max = 1,
	max_drop_level = 3,
	tool_capabilities = {
		full_punch_interval = 1.0,
		max_drop_level = 1,
		groupcaps = {
			snappy = {times = {[3] = 0.2}, uses = 60, maxlevel = 3},
		}
	},
})

minetest.register_craft({
	output = 'vines:shears',
	recipe = {
		{'', 'default:steel_ingot', ''},
		{'group:stick', 'group:wood', 'default:steel_ingot'},
		{'', '', 'group:stick'}
	}
})

-- ROOT VINES
if enable_roots ~= false then
	vines.register_vine('root',
		{description = S("Roots"), average_length = 9}, {
		place_on = {
			"default:dirt_with_grass",
			"default:dirt"
		},
		spawn_on_bottom = true,
		rarity = rarity_roots,
	})
else
	minetest.register_alias('vines:root_middle', 'air')
	minetest.register_alias('vines:root_end', 'air')
end

-- STANDARD VINES
if enable_standard ~= false then
	vines.register_vine('vine',
		{description = S("Vines"), average_length = 5}, {
		place_on = {
			"default:jungleleaves",
			"moretrees:jungletree_leaves_red",
			"moretrees:jungletree_leaves_yellow",
			"moretrees:jungletree_leaves_green"
		},
		spawn_on_bottom = true,
		rarity = rarity_standard,
	})
else
	minetest.register_alias('vines:vine_middle', 'air')
	minetest.register_alias('vines:vine_end', 'air')
end

-- SIDE VINES
if enable_side ~= false then
	vines.register_vine('side',
		{description = S("Vines"), average_length = 6}, {
		place_on = {
			"default:jungleleaves",
			"moretrees:jungletree_leaves_red",
			"moretrees:jungletree_leaves_yellow",
			"moretrees:jungletree_leaves_green"
		},
		spawn_on_side = true,
		rarity = rarity_side,
	})
else
	minetest.register_alias('vines:side_middle', 'air')
	minetest.register_alias('vines:side_end', 'air')
end

-- JUNGLE VINES
if enable_jungle ~= false then
	vines.register_vine("jungle",
		{description = S("Jungle Vines"), average_length = 7}, {
		place_on = {
			"default:jungletree",
			"moretrees:jungletree_trunk"
		},
		spawn_on_side = true,
		rarity = rarity_jungle,
	})
else
	minetest.register_alias('vines:jungle_middle', 'air')
	minetest.register_alias('vines:jungle_end', 'air')
end

-- WILLOW VINES (Note from 2024-06: Broken for years now, integration w/ new moretrees spawn mechanic needed)
if enable_willow ~= false then
	vines.register_vine("willow",
		{description = S("Willow Vines"), average_length = 9}, {
		spawn_on_side = true,
		place_on = {"moretrees:willow_leaves"},
		rarity = rarity_willow,
	})
else
	minetest.register_alias('vines:willow_middle', 'air')
	minetest.register_alias('vines:willow_end', 'air')
end