VoxeLibre/mods/ITEMS/mcl_portals/portal_end.lua

-- Parameters
local SPAWN_MIN = mcl_vars.mg_end_min+70
local SPAWN_MAX = mcl_vars.mg_end_min+98

local mg_name = minetest.get_mapgen_setting("mg_name")

-- End portal
minetest.register_node("mcl_portals:portal_end", {
	description = "End Portal",
	_doc_items_longdesc = "An End portal teleports creatures and objects to the mysterious End dimension (and back!).",
	_doc_items_usagehelp = "Hop into the portal to teleport. Entering an End portal in the Overworld teleports you to a fixed position in the End dimension and creates a 5×5 obsidian platform at your destination. End portals in the End will lead back to your spawn point in the Overworld.",
	tiles = {
		{
			name = "mcl_portals_end_portal.png",
			animation = {
				type = "vertical_frames",
				aspect_w = 16,
				aspect_h = 16,
				length = 1.0,
			},
		},
		"blank.png",
		"blank.png",
		"blank.png",
		"blank.png",
		"blank.png",
	},
	drawtype = "nodebox",
	paramtype = "light",
	sunlight_propagates = true,
	use_texture_alpha = true,
	walkable = false,
	diggable = false,
	pointable = false,
	buildable_to = false,
	is_ground_content = false,
	drop = "",
	-- This is 15 in MC.
	light_source = 14,
	post_effect_color = {a = 192, r = 0, g = 0, b = 0},
	alpha = 192,
	node_box = {
		type = "fixed",
		fixed = {
			{-0.5, -0.5, -0.5, 0.5, 4/16, 0.5},
		},
	},
	groups = {not_in_creative_inventory = 1},

	_mcl_hardness = -1,
	_mcl_blast_resistance = 18000000,
})

-- Obsidian platform at the End portal destination in the End
local function build_end_portal_destination(pos)
	local p1 = {x = pos.x - 2, y = pos.y, z = pos.z-2}
	local p2 = {x = pos.x + 2, y = pos.y+2, z = pos.z+2}

	for x = p1.x, p2.x do
	for y = p1.y, p2.y do
	for z = p1.z, p2.z do
		local newp = {x=x,y=y,z=z}
		-- Build obsidian platform
		if minetest.registered_nodes[minetest.get_node(newp).name].is_ground_content then
			if y == p1.y then
				minetest.set_node(newp, {name="mcl_core:obsidian"})
			else
				minetest.remove_node(newp)
			end
		end
	end
	end
	end
end


-- Check if pos is part of a valid end portal frame, filled with eyes of ender.
local function check_end_portal_frame(pos)
	-- Check if pos has an end portal frame with eye of ender
	local eframe = function(pos, param2)
		local node = minetest.get_node(pos)
		if node.name == "mcl_portals:end_portal_frame_eye" then
			if param2 == nil or node.param2 == param2 then
				return true, node
			end
		end
		return false
	end

	-- Step 1: Find a row of 3 end portal frames with eyes, all facing the same direction
	local streak = 0
	local streak_start, streak_end, streak_start_node, streak_end_node
	local last_param2
	local axes = { "x", "z" }
	for a=1, #axes do
		local axis = axes[a]
		for b=pos[axis]-2, pos[axis]+2 do
			local cpos = table.copy(pos)
			cpos[axis] = b
			local e, node = eframe(cpos, last_param2)
			if e then
				last_param2 = node.param2
				streak = streak + 1
				if streak == 1 then
					streak_start = table.copy(pos)
					streak_start[axis] = b
					streak_start_node = node
				elseif streak == 3 then
					streak_end = table.copy(pos)
					streak_end[axis] = b
					streak_end_node = node
					break
				end
			else
				streak = 0
				last_param2 = nil
			end
		end
		if streak_end then
			break
		end
		streak = 0
		last_param2 = nil
	end
	-- Has a row been found?
	if streak_end then
		-- Step 2: Using the known facedir, check the remaining spots in which we expect
		-- “eyed” end portal frames.
		local dir = minetest.facedir_to_dir(streak_start_node.param2)
		if dir.x ~= 0 then
			for i=1, 3 do
				if not eframe({x=streak_start.x + i*dir.x, y=streak_start.y, z=streak_start.z - 1}) then
					return false
				end
				if not eframe({x=streak_start.x + i*dir.x, y=streak_start.y, z=streak_end.z + 1}) then
					return false
				end
				if not eframe({x=streak_start.x + 4*dir.x, y=streak_start.y, z=streak_start.z + i-1}) then
					return false
				end
			end
			-- All checks survived! We have a valid portal!
			if dir.x > 0 then
				k = 1
			else
				k = -3
			end
			return true, { x = streak_start.x + k, y = streak_start.y, z = streak_start.z }
		elseif dir.z ~= 0 then
			for i=1, 3 do
				if not eframe({x=streak_start.x - 1, y=streak_start.y, z=streak_start.z + i*dir.z}) then
					return false
				end
				if not eframe({x=streak_end.x + 1, y=streak_start.y, z=streak_start.z + i*dir.z}) then
					return false
				end
				if not eframe({x=streak_start.x + i-1, y=streak_start.y, z=streak_start.z + 4*dir.z}) then
					return false
				end
			end
			if dir.z > 0 then
				k = 1
			else
				k = -3
			end
			-- All checks survived! We have a valid portal!
			return true, { x = streak_start.x, y = streak_start.y, z = streak_start.z + k }
		end
	end
	return false
end

-- Generate a 3×3 end portal beginning at pos. To be used to fill an end portal frame
local function spawn_end_portal(pos)
	local SIZE = 3
	for x=pos.x, pos.x+SIZE-1 do
		for z=pos.z, pos.z+SIZE-1 do
			minetest.set_node({x=x,y=pos.y,z=z}, {name="mcl_portals:portal_end"})
		end
	end
end

minetest.register_abm({
	label = "End portal teleportation",
	nodenames = {"mcl_portals:portal_end"},
	interval = 1,
	chance = 1,
	action = function(pos, node)
		-- Destroy legacy end portals created with quartz block frame
		-- by turning them into cobwebs.
		-- We can tell if a end portal is legacy if it has portal_target as metadata.
		-- FIXME: Remove this after some time.
		local meta = minetest.get_meta(pos)
		local legacy_portal_target = meta:get_string("portal_frame1")
		if legacy_portal_target and legacy_portal_target ~= "" then
			minetest.set_node(pos, {name="mcl_core:cobweb"})
			return
		end

		for _,obj in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
			local lua_entity = obj:get_luaentity() --maikerumine added for objects to travel
			if obj:is_player() or lua_entity then
				local dim = mcl_worlds.pos_to_dimension(pos)

				local objpos = obj:getpos()
				if objpos == nil then
					return
				end

				-- Check if object is actually in portal.
				objpos.y = math.ceil(objpos.y)
				if minetest.get_node(objpos).name ~= "mcl_portals:portal_end" then
					return
				end

				local target
				if dim == "end" then
					-- End portal in the End:
					-- Teleport back to the player's spawn in the Overworld.

					target = mcl_spawn.get_spawn_pos(obj)
				else
					-- End portal in any other dimension:
					-- Teleport to the End at a fixed position and generate a
					-- 5×5 obsidian platform below.

					local platform_pos = mcl_vars.mg_end_platform_pos
					-- force emerge of target1 area
					minetest.get_voxel_manip():read_from_map(platform_pos, platform_pos)
					if not minetest.get_node_or_nil(platform_pos) then
						minetest.emerge_area(vector.subtract(platform_pos, 3), vector.add(platform_pos, 3))
					end

					-- Build destination
					local function check_and_build_end_portal_destination(pos)
						local n = minetest.get_node_or_nil(pos)
						if n and n.name ~= "mcl_core:obsidian" then
							build_end_portal_destination(pos)
							minetest.after(2, check_and_build_end_portal_destination, pos)
						elseif not n then
							minetest.after(1, check_and_build_end_portal_destination, pos)
						end
					end

					local platform
					build_end_portal_destination(platform_pos)
					check_and_build_end_portal_destination(platform_pos)

					target = table.copy(platform_pos)
					target.y = target.y + 1
				end

				-- Teleport
				obj:set_pos(target)
				if obj:is_player() then
					-- Look towards the main End island
					if dim ~= "end" then
						obj:set_look_horizontal(math.pi/2)
					end
					mcl_worlds.dimension_change(obj, mcl_worlds.pos_to_dimension(target))
					minetest.sound_play("mcl_portals_teleport", {pos=target, gain=0.5, max_hear_distance = 16})
				end
			end
		end
	end,
})


--[[ ITEM OVERRIDES ]]

minetest.register_node("mcl_portals:end_portal_frame", {
	description = "End Portal Frame",
	_doc_items_longdesc = "End portal frames are used in the construction of End portals. Each block has a socket for an eye of ender.",
	_doc_items_usagehelp = "To create an End portal, you need 12 end portal frames and 12 eyes of ender. The end portal frames have to be arranged around a horizontal 3×3 area with each block facing inward. Any other arrangement will fail." .. "\n" .. "Place an eye of ender into each block. The end portal appears in the middle after placing the final eye." .. "\n" .. "Once placed, an eye of ender can not be taken back.",
	groups = { creative_breakable = 1, deco_block = 1 },
	tiles = { "mcl_portals_endframe_top.png", "mcl_portals_endframe_bottom.png", "mcl_portals_endframe_side.png" },
	paramtype2 = "facedir",
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = { -0.5, -0.5, -0.5, 0.5, 5/16, 0.5 },
	},
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	paramtype = "light",
	sunlight_propagates = false,
	light_source = 1,
	_mcl_blast_resistance = 18000000,
	_mcl_hardness = -1,
})

minetest.register_node("mcl_portals:end_portal_frame_eye", {
	description = "End Portal Frame with Eye of Ender",
	_doc_items_create_entry = false,
	groups = { creative_breakable = 1, not_in_creative_inventory = 1 },
	tiles = { "mcl_portals_endframe_top.png^[lowpart:75:mcl_portals_endframe_eye.png", "mcl_portals_endframe_bottom.png", "mcl_portals_endframe_eye.png^mcl_portals_endframe_side.png" },
	paramtype2 = "facedir",
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {
			{ -0.5, -0.5, -0.5, 0.5, 5/16, 0.5 }, -- Frame
			{ -4/16, 5/16, -4/16, 4/16, 0.5, 4/16 }, -- Eye
		},
	},
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	paramtype = "light",
	sunlight_propagates = false,
	light_source = 1,
	_mcl_blast_resistance = 18000000,
	_mcl_hardness = -1,
	-- TODO: Destroy end portal if this block got destroyed
})

if minetest.get_modpath("doc") then
	doc.add_entry_alias("nodes", "mcl_portals:end_portal_frame", "nodes", "mcl_portals:end_portal_frame_eye")
end


-- Portal opener
minetest.override_item("mcl_end:ender_eye", {
	_doc_items_longdesc = "Eye of ender can be used in the construction of End portal frames.",
	_doc_items_usagehelp = "Find a structure with 12 end portal frames surrounding a horizontal aread of 3×3 blocks, with each block facing inward. Place an eye of ender into each end portal frame to create the portal.",
	on_place = function(itemstack, user, pointed_thing)
		-- Use pointed node's on_rightclick function first, if present
		local node = minetest.get_node(pointed_thing.under)
		if user and not user:get_player_control().sneak then
			if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
				return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, user, itemstack) or itemstack
			end
		end

		-- Place eye of ender into end portal frame
		if pointed_thing.under and node.name == "mcl_portals:end_portal_frame" then
			minetest.swap_node(pointed_thing.under, { name = "mcl_portals:end_portal_frame_eye", param2 = node.param2 })

			if minetest.get_modpath("doc") then
				doc.mark_entry_as_revealed(user:get_player_name(), "nodes", "mcl_portals:end_portal_frame")
			end
			minetest.sound_play(
				"default_place_node_hard",
				{pos = pointed_thing.under, gain = 0.5, max_hear_distance = 16})
			if not minetest.settings:get_bool("creative_mode") then
				itemstack:take_item() -- 1 use
			end

			local ok, ppos = check_end_portal_frame(pointed_thing.under)
			if ok then
				spawn_end_portal(ppos)
				if minetest.get_modpath("doc") then
					doc.mark_entry_as_revealed(user:get_player_name(), "nodes", "mcl_portals:portal_end")
				end
			end
		end
		return itemstack
	end,
})