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

---@param b Vector[]
---@param c integer
---@param pr PseudoRandom
---@return Vector[]
local function get_replacements(b, c, pr)
	local r = {}
	if not b then return r end
	for _, v in pairs(b) do
		if pr:next(1, 100) < c then table.insert(r, v) end
	end
	return r
end

local def = {
	place_on = { "group:grass_block", "group:dirt", "mcl_core:dirt_with_grass", "group:grass_block", "group:sand",
		"group:grass_block_snow", "mcl_core:snow" },
	fill_ratio = 0.01,
	flags = "place_center_x, place_center_z, all_floors",
	solid_ground = true,
	make_foundation = true,
	chunk_probability = 800,
	y_max = mcl_vars.mg_overworld_max,
	y_min = 1,
	sidelen = 10,
	y_offset = -5,
	filenames = {
		modpath .. "/schematics/mcl_structures_ruined_portal_1.mts",
		modpath .. "/schematics/mcl_structures_ruined_portal_2.mts",
		modpath .. "/schematics/mcl_structures_ruined_portal_3.mts",
		modpath .. "/schematics/mcl_structures_ruined_portal_4.mts",
		modpath .. "/schematics/mcl_structures_ruined_portal_5.mts",
		modpath .. "/schematics/mcl_structures_ruined_portal_99.mts",
	},
	after_place = function(pos, def, pr)
		local hl = def.sidelen / 2
		local p1 = vector.offset(pos, -hl, -hl, -hl)
		local p2 = vector.offset(pos, hl, hl, hl)
		local gold = minetest.find_nodes_in_area(p1, p2, { "mcl_core:goldblock" })
		local lava = minetest.find_nodes_in_area(p1, p2, { "mcl_core:lava_source" })
		local rack = minetest.find_nodes_in_area(p1, p2, { "mcl_nether:netherrack" })
		local brick = minetest.find_nodes_in_area(p1, p2, { "mcl_core:stonebrick" })
		local obby = minetest.find_nodes_in_area(p1, p2, { "mcl_core:obsidian" })
		minetest.bulk_set_node(get_replacements(gold, 30, pr), { name = "air" })
		minetest.bulk_set_node(get_replacements(lava, 20, pr), { name = "mcl_nether:magma" })
		minetest.bulk_set_node(get_replacements(rack, 7, pr), { name = "mcl_nether:magma" })
		minetest.bulk_set_node(get_replacements(obby, 30, pr), { name = "mcl_core:crying_obsidian" })
		minetest.bulk_set_node(get_replacements(obby, 10, pr), { name = "air" })
		minetest.bulk_set_node(get_replacements(brick, 50, pr), { name = "mcl_core:stonebrickcracked" })
		brick = minetest.find_nodes_in_area(p1, p2, { "mcl_core:stonebrick" })
		minetest.bulk_set_node(get_replacements(brick, 50, pr), { name = "mcl_core:stonebrickmossy" })
	end,
	loot = {
		["mcl_chests:chest_small"] = { {
			stacks_min = 2,
			stacks_max = 6,
			items = {
				{ itemstring = "mcl_core:iron_nugget", weight = 40, amount_min = 9, amount_max = 18 },
				{ itemstring = "mcl_core:flint", weight = 40, amount_min = 1, amount_max = 4 },
				{ itemstring = "mcl_core:obsidian", weight = 40, amount_min = 1, amount_max = 2 },
				{ itemstring = "mcl_fire:fire_charge", weight = 40, amount_min = 1, amount_max = 1 },
				{ itemstring = "mcl_fire:flint_and_steel", weight = 40, amount_min = 1, amount_max = 1 },
				{ itemstring = "mcl_core:gold_nugget", weight = 15, amount_min = 4, amount_max = 24 },
				{ itemstring = "mcl_core:apple_gold", weight = 15, },

				{ itemstring = "mcl_books:book", weight = 1, func = function(stack, pr)
					mcl_enchanting.enchant_uniform_randomly(stack, { "soul_speed" }, pr)
				end },
				--{ itemstring = "mcl_bamboo:bamboo", weight = 15, amount_min = 1, amount_max=3 }, --FIXME BAMBOO

				{ itemstring = "mcl_core:diamond", weight = 3, amount_min = 1, amount_max = 3 },
				{ itemstring = "mcl_mobitems:saddle", weight = 3, },
				{ itemstring = "mcl_core:emerald", weight = 2, amount_min = 1, amount_max = 3 },

				{ itemstring = "mcl_mobitems:iron_horse_armor", weight = 1, },
				{ itemstring = "mcl_mobitems:gold_horse_armor", weight = 1, },
				{ itemstring = "mcl_mobitems:diamond_horse_armor", weight = 1, },
				{ itemstring = "mcl_core:apple_gold", weight = 15, },
			}
		} }
	}
}

mcl_structures.register_structure("ruined_portal_overworld", def)

local ndef = table.copy(def)
ndef.y_min = mcl_vars.mg_lava_nether_max + 10
ndef.y_max = mcl_vars.mg_nether_max - 15
ndef.place_on = { "mcl_nether:netherrack", "group:soul_block", "mcl_blackstone:basalt,mcl_blackstone:blackstone",
	"mcl_crimson:crimson_nylium", "mcl_crimson:warped_nylium" }

mcl_structures.register_structure("ruined_portal_nether", ndef)