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


mcl_structures.register_structure("end_spawn_obsidian_platform", {
	static_pos = { mcl_vars.mg_end_platform_pos },
	place_func = function(pos, def, pr)
		local obby = minetest.find_nodes_in_area(vector.offset(pos, -2, 0, -2), vector.offset(pos, 2, 0, 2),
			{ "air", "mcl_end:end_stone" })
		local air = minetest.find_nodes_in_area(vector.offset(pos, -2, 1, -2), vector.offset(pos, 2, 3, 2),
			{ "air", "mcl_end:end_stone" })
		minetest.bulk_set_node(obby, { name = "mcl_core:obsidian" })
		minetest.bulk_set_node(air, { name = "air" })
		return true
	end,
})

mcl_structures.register_structure("end_exit_portal", {
	static_pos = { mcl_vars.mg_end_exit_portal_pos },
	filenames = {
		modpath .. "/schematics/mcl_structures_end_exit_portal.mts"
	},
	after_place = function(pos, def, pr, blockseed)
		if minetest.settings:get_bool("only_peaceful_mobs", false) then
			return
		end
		local p1 = vector.offset(pos, -16, -16, -16)
		local p2 = vector.offset(pos, 16, 21, 16)
		minetest.emerge_area(p1, p2, function(blockpos, action, calls_remaining, param)
			if calls_remaining > 0 then return end
			minetest.bulk_set_node(minetest.find_nodes_in_area(p1, p2, { "mcl_portals:portal_end" }), { name = "air" })
			local obj = minetest.add_entity(vector.offset(pos, 3, 11, 3), "mobs_mc:enderdragon")
			if obj then
				local dragon_entity = obj:get_luaentity()
				dragon_entity._portal_pos = pos
				if blockseed ~= -1 then
					dragon_entity._initial = true
				end
			else
				minetest.log("error", "[mcl_mapgen_core] ERROR! Ender dragon doesn't want to spawn")
			end
			minetest.fix_light(p1, p2)
		end)
	end
})
mcl_structures.register_structure("end_exit_portal_open", {
	filenames   = {
		modpath .. "/schematics/mcl_structures_end_exit_portal.mts"
	},
	after_place = function(pos, def, pr)
		local p1 = vector.offset(pos, -16, -16, -16)
		local p2 = vector.offset(pos, 16, 16, 16)
		minetest.fix_light(p1, p2)
	end
})
mcl_structures.register_structure("end_gateway_portal", {
	filenames = {
		modpath .. "/schematics/mcl_structures_end_gateway_portal.mts"
	},
})

local function get_tower(p, h, tbl)
	for i = 1, h do
		table.insert(tbl, vector.offset(p, 0, i, 0))
	end
end

local function make_endspike(pos, width, height)
	local nn = minetest.find_nodes_in_area(vector.offset(pos, -width / 2, 0, -width / 2),
		vector.offset(pos, width / 2, 0, width / 2), { "air", "group:solid" })
	table.sort(nn, function(a, b)
		return vector.distance(pos, a) < vector.distance(pos, b)
	end)
	local nodes = {}
	for i = 1, math.ceil(#nn * 0.55) do
		get_tower(nn[i], height, nodes)
	end
	minetest.bulk_set_node(nodes, { name = "mcl_core:obsidian" })
	return vector.offset(pos, 0, height, 0)
end

local function make_cage(pos, width)
	local nodes = {}
	local nodes2 = {}
	local r = math.max(1, math.floor(width / 2) - 2)
	for x = -r, r do for y = 0, width do for z = -r, r do
				if x == r or x == -r or z == r or z == -r then
					table.insert(nodes, vector.add(pos, vector.new(x, y, z)))
				end
			end
		end
	end
	if xpanes then
		minetest.bulk_set_node(nodes, { name = "xpanes:bar_flat" })
		for _, p in pairs(nodes) do
			xpanes.update_pane(p)
		end
	end
end

local function get_points_on_circle(pos, r, n)
	local rt = {}
	for i = 1, n do
		table.insert(rt, vector.offset(pos, r * math.cos(((i - 1) / n) * (2 * math.pi)), 0,
			r * math.sin(((i - 1) / n) * (2 * math.pi))))
	end
	return rt
end

mcl_structures.register_structure("end_spike", {
	static_pos = get_points_on_circle(vector.offset(mcl_vars.mg_end_exit_portal_pos, 0, -20, 0), 43, 10),
	place_func = function(pos, def, pr)
		local d = pr:next(6, 12)
		local h = d * pr:next(4, 6)
		local p1 = vector.offset(pos, -d / 2, 0, -d / 2)
		local p2 = vector.offset(pos, d / 2, h + d, d / 2)
		minetest.emerge_area(p1, p2, function(blockpos, action, calls_remaining, param)
			if calls_remaining ~= 0 then return end
			local s = make_endspike(pos, d, h)
			minetest.set_node(vector.offset(s, 0, 1, 0), { name = "mcl_core:bedrock" })
			minetest.add_entity(vector.offset(s, 0, 2, 0), "mcl_end:crystal")
			if pr:next(1, 3) == 1 then
				make_cage(vector.offset(s, 0, 1, 0), d)
			end
		end)
		return true
	end,
})