boxes = {}

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

-- Box allocation
dofile(modpath .. "/valloc.lua")

-- Handling the data that encodes boxes
dofile(modpath .. "/data.lua")

-- Import/export boxes to files
dofile(modpath .. "/io.lua")

-- Handle inventory-related callbacks (i.e. whether the itemstacks
-- should be decreased when placing nodes)
dofile(modpath .. "/inv.lua")

-- Nodes that have a box-related effect
dofile(modpath .. "/nodes.lua")

-- Set the region from minp to maxp to air
function boxes.cleanup(minp, maxp)
	-- Clear any leftover entities
	local center = vector.divide(vector.add(minp, maxp), 2)
	local radius = vector.length(vector.subtract(vector.add(maxp, 1), minp)) / 2
	for _, obj in ipairs(minetest.get_objects_inside_radius(center, radius)) do
		if not obj:is_player() then
			local pos = obj:get_pos()
			if minp.x - 0.5 <= pos.x and pos.x <= maxp.x + 0.5 and
				minp.y - 0.5 <= pos.y and pos.y <= maxp.y + 0.5 and
				minp.z - 0.5 <= pos.z and pos.z <= maxp.z + 0.5
			then
				obj:remove()
			end
		end
	end

	local vm = minetest.get_voxel_manip(minp, maxp)
	local emin, emax = vm:get_emerged_area()
	local va = VoxelArea:new{MinEdge=emin,MaxEdge=emax}
	local vmdata = vm:get_data()
	local param2 = vm:get_param2_data()
	local cid = minetest.get_content_id("air")

	for z = minp.z, maxp.z do
		for y = minp.y, maxp.y do
			local index = va:index(minp.x, y, z)
			for x = minp.x, maxp.x do
				vmdata[index] = cid
				param2[index] = 0
				index = index + 1
			end
		end
	end

	vm:set_data(vmdata)
	vm:set_param2_data(param2)
	vm:update_liquids()
	vm:write_to_map()
	vm:update_map()
end

function vector.min(a, b)
	return {
		x = math.min(a.x, b.x),
		y = math.min(a.y, b.y),
		z = math.min(a.z, b.z),
	}
end

function vector.max(a, b)
	return {
		x = math.max(a.x, b.x),
		y = math.max(a.y, b.y),
		z = math.max(a.z, b.z),
	}
end

boxes.players_in_boxes = {}

local function open_door(player, pos1, pos2, bminp, bmaxp)
	local minp = vector.min(pos1, pos2)
	local maxp = vector.max(pos1, pos2)
	local drs = {}
	local i = 1
	for x = minp.x, maxp.x do
		for y = minp.y, maxp.y do
			for z = minp.z, maxp.z do
				local door = doors.get({x = x, y = y, z = z})
				if door then
					door:open()
					drs[i] = {x = x, y = y, z = z}
					i = i + 1
				end
			end
		end
	end
	local od = boxes.players_in_boxes[player:get_player_name()].open_doors
	od[#od + 1] = {minp = bminp, maxp = bmaxp, doors = drs, respawn =
			{x = maxp.x + 1, y = minp.y, z = (minp.z + maxp.z) / 2}}
end

local function handle_stats(stat, name, new_score, num_total)
	if stat.player_best[name] then
		local old = stat.player_best[name]
		if new_score < old then
			stat.average_best = stat.average_best + (new_score - old) / num_total
			stat.player_best[name] = new_score
			stat.overall_best = math.min(stat.overall_best, new_score)
		end
	else
		stat.player_best[name] = new_score
		stat.average_first = (num_total * stat.average_first + new_score) / (num_total + 1)
		stat.average_best = (num_total * stat.average_best + new_score) / (num_total + 1)
		stat.ovarall_best = math.min(stat.overall_best, new_score)
	end
end

function boxes.player_success(player)
	local name = player:get_player_name()
	local box = boxes.players_in_boxes[name]
	local id = box.box_id
	local time_taken = minetest.get_gametime() - box.start_time
	local deaths = box.deaths
	local damage = box.damage
	local bmeta = db.box_get_meta(id)
	local k = bmeta.meta.num_completed_players
	handle_stats(bmeta.meta.time, name, time_taken, k)
	handle_stats(bmeta.meta.deaths, name, deaths, k)
	handle_stats(bmeta.meta.damage, name, damage, k)
	if not bmeta.meta.completed_players[name] then
		bmeta.meta.completed_players[name] = true
		bmeta.meta.num_completed_players = k + 1
	end
	db.box_set_meta(id, bmeta)
	for _, p in ipairs(box.signs_to_update) do
		local node = minetest.get_node(p)
		if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_exit_update then
			minetest.registered_nodes[node.name].on_exit_update(p, player, {
				time_taken = {format = "time", data = time_taken},
				damage_taken = {format = "text", data = tostring(damage)},
				num_deaths = {format = "text", data = tostring(deaths)},
			})
		end
	end
	local sid = box.in_series
	if sid then
		local pmeta = db.player_get_meta(name)
		local index = pmeta.series_progress[sid] or 1
		pmeta.series_progress[sid] = index + 1
		db.player_set_meta(name, pmeta)
	end
end

function boxes.open_exit(player)
	local name = player:get_player_name()
	local box = boxes.players_in_boxes[name]
	local exds = box.exit_doors
	local n = #exds
	if n == 0 then return end
	local ex = exds[n]
	exds[n] = nil
	open_door(player, ex.door_pos, vector.add(ex.door_pos, {x = -1, y = 0, z = 1}), ex.box_minp, ex.box_maxp)
end

function boxes.increase_items(player)
	local name = player:get_player_name()
	if not boxes.players_in_boxes[name] then
		return
	end
	local exds = boxes.players_in_boxes[name].exit_doors
	local n = #exds
	if n == 0 then return end
	local ex = exds[n]
	ex.door_items = ex.door_items - 1
	if ex.door_items == 0 then
		boxes.open_exit(player)
	end
end

-- Close doors behind players
minetest.register_globalstep(function(dtime)
	for playername, info in pairs(boxes.players_in_boxes) do
		local i = 1
		local player = minetest.get_player_by_name(playername)
		local pos = player:get_pos()
		local odoors = info.open_doors
		local n = #odoors
		while odoors[i] do
			local off = 0.7
			if odoors[i].minp.x + off <= pos.x and pos.x <= odoors[i].maxp.x - off and
				odoors[i].minp.y <= pos.y and pos.y <= odoors[i].maxp.y and
				odoors[i].minp.z + off <= pos.z and pos.z <= odoors[i].maxp.z - off
			then
				for _, dpos in ipairs(odoors[i].doors) do
					local door = doors.get(dpos)
					if door then
						door:close()
					end
				end
				info.respawn = odoors[i].respawn
				odoors[i] = odoors[n]
				odoors[n] = nil
				n = n - 1
				if not info.start_time then
					info.start_time = minetest.get_gametime()
					info.deaths = 0
					info.damage = 0
					music.start(player, info, "box")
				else
					-- We closed the last door: the player got out!
					boxes.player_success(player)
					minetest.chat_send_all(playername .. " completed box " .. info.box_id .. "!")
					music.start(player, info, "exit")
				end
			else
				i = i + 1
			end
		end
	end
end)

-- Although this functions takes a list as an argument,
-- several parts of the code rely on it having length exactly
-- 3 and being entry lobby, box, exit
function boxes.open_box(player, box_id_list)
	local name = player:get_player_name()
	if boxes.players_in_boxes[name] ~= nil or boxes.players_editing_boxes[name] ~= nil then
		return
	end

	local offset = {x = 0, y = 0, z = 0}
	local pmin = {x = 0, y = 0, z = 0}
	local pmax = {x = 0, y = 0, z = 0}
	local metas = {}
	local offsets = {}
	for i, box in ipairs(box_id_list) do
		local meta = db.box_get_meta(box).meta
		metas[i] = meta
		offset = vector.subtract(offset, meta.entry)
		pmin = vector.min(pmin, offset)
		pmax = vector.max(pmax, vector.add(offset, meta.size))
		offsets[i] = offset
		offset = vector.add(offset, meta.exit)
	end
	for i, off in ipairs(offsets) do
		offsets[i] = vector.subtract(off, pmin)
	end
	pmax = vector.subtract(pmax, pmin)

	local size = math.max(pmax.x, pmax.z)
	local minp = boxes.valloc(size)
	local maxp = vector.add(minp, vector.subtract(pmax, 1))

	local exit_doors = {}
	local n = #box_id_list
	for i = 1, n - 1 do
		local exd = vector.add(minp, vector.add(metas[n - i].exit, offsets[n - i]))
		exit_doors[i] = {
			door_items = metas[n - i].num_items,
			door_pos = exd,
			box_minp = vector.add(minp, offsets[n - i + 1]),
			box_maxp = vector.add(minp, vector.add(offsets[n - i + 1], vector.subtract(metas[n - i + 1].size, 1))),
		}
	end

	local spawn_pos = vector.add(minp, vector.add(metas[1].entry, offsets[1]))
	spawn_pos.y = spawn_pos.y - 0.5

	local signs_to_update = {}
	for i, p in ipairs(metas[3].signs_to_update) do
		signs_to_update[i] = vector.add(p, vector.add(minp, offsets[3]))
	end

	boxes.players_in_boxes[name] = {
		box_id = box_id_list[2],
		minp = minp,
		maxp = maxp,
		exit_doors = exit_doors,
		exit = vector.add(minp, vector.add(metas[n].exit, offsets[n])),
		open_doors = {},
		respawn = spawn_pos,
		signs_to_update = signs_to_update,
	}

	for i, box in ipairs(box_id_list) do
		boxes.load(vector.add(minp, offsets[i]), box, player)
	end

	player:set_physics_override({gravity = 0, jump = 0})
	player:set_pos(spawn_pos)
	minetest.after(0.5, function()
		player:set_physics_override({gravity = 1, jump = 1})
	end)
	player:set_look_horizontal(3 * math.pi / 2)
	player:set_look_vertical(0)
	players.give_box_inventory(player)
	skybox.set(player, metas[n - 1].skybox)

	boxes.open_exit(player)
end

function boxes.close_box(player)
	local name = player:get_player_name()
	if boxes.players_in_boxes[name] == nil then
		return
	end

	local bx = boxes.players_in_boxes[name]
	boxes.cleanup(bx.minp, bx.maxp)
	boxes.vfree(bx.minp)
	boxes.players_in_boxes[name] = nil
end

function boxes.next_series(player, sid)
	local name = player:get_player_name()
	local pmeta = db.player_get_meta(name)
	local index = pmeta.series_progress[sid] or 1
	local bxs = db.series_get_boxes(sid)
	if not bxs[index] then
		players.return_to_lobby(player)
		return false
	else
		boxes.open_box(player, {0, bxs[index], 1})
		boxes.players_in_boxes[name].in_series = sid
		return true
	end
end

boxes.players_editing_boxes = {}

minetest.register_chatcommand("enter", {
	params = "<boxid>",
	description = "Enter box with this id",
	-- privs = {server = true},
	func = function(name, param)
		local player = minetest.get_player_by_name(name)
		if boxes.players_in_boxes[name] or boxes.players_editing_boxes[name] then
			minetest.chat_send_player(name, "You are already in a box!")
			return
		end
		local id = tonumber(param)
		if not id or id ~= math.floor(id) or id < 0 then
			minetest.chat_send_player(name, "The id you supplied is not a nonnegative interger.")
			return
		end
		local meta = db.box_get_meta(id)
		if not meta or meta.type ~= db.BOX_TYPE then
			minetest.chat_send_player(name, "The id you supplied does not correspond to any box.")
			return
		end
		boxes.open_box(player, {0, id, 1})
	end,
})

minetest.register_chatcommand("series_create", {
	params = "<name>",
	description = "Create a new series",
	privs = {server = true},
	func = function(name, param)
		if param == "" then
			minetest.chat_send_player(name, "Please privide a name for the series")
			return
		end
		local id = db.series_create(param)
		if id then
			minetest.chat_send_player(name, "Series successfully created with id " .. id)
		else
			minetest.chat_send_player(name, "Series failed to create")
		end
	end
})

minetest.register_chatcommand("series_destroy", {
	params = "<series_id>",
	description = "Destroy a series",
	privs = {server = true},
	func = function(name, param)
		if param == "" then
			minetest.chat_send_player(name, "Please privide a series id to destroy")
			return
		end
		local id = tonumber(param)
		if not db.series_destroy(id) then
			minetest.chat_send_player(name, "Failed to destroy series " .. id)
		else
			minetest.chat_send_player(name, "Destroyed series " .. id)
		end
	end
})

minetest.register_chatcommand("series_add", {
	params = "<series_id> <box_id>",
	description = "Add a box a series",
	privs = {server = true},
	func = function(name, param)
		local sid, bid = string.match(param, "^([^ ]+) +(.+)$")
		sid = tonumber(sid)
		bid = tonumber(bid)
		if not sid or not bid or not db.series_get_meta(sid) or not db.box_get_meta(bid) then
			minetest.chat_send_player(name, "Box or series doesn't exist.")
			return
		end
		db.series_add_at_end(sid, bid)
		minetest.chat_send_player(name, "Done")
	end
})

minetest.register_chatcommand("series_list", {
	params = "",
	description = "List defined series",
	privs = {server = true},
	func = function(name, param)
		if param ~= "" then
			-- list boxes in this series.
			local sid = tonumber(param)
			if not sid or not db.series_get_meta(sid) then
				minetest.chat_send_player(name, "Series doesn't exist.")
				return
			end
			for _, v in ipairs(db.series_get_boxes(sid)) do
				minetest.chat_send_player(name, v)
			end
		else
			-- list all series
			for k, v in ipairs(db.series_get_series()) do
				minetest.chat_send_player(name, v.id .. " - " .. v.name)
			end
		end
	end
})

minetest.register_chatcommand("series_remove", {
	params = "<series_id> <box_id>",
	description = "Remove a box from specified series",
	privs = {server = true},
	func = function(name, param)
		local sid, bid = string.match(param, "^([^ ]+) +(.+)$")
		sid = tonumber(sid)
		bid = tonumber(bid)
		if not sid or not bid or not db.series_get_meta(sid) or not db.box_get_meta(bid) then
			minetest.chat_send_player(name, "Box or series doesn't exist.")
			return
		end
		db.series_delete_box(sid, bid)
		minetest.chat_send_player(name, "Done")
	end
})


minetest.register_chatcommand("leave", {
	params = "",
	description = "Leave the current box",
	privs = {server = true},
	func = function(name, param)
		if not boxes.players_in_boxes[name] then
			minetest.chat_send_player(name, "You are not in a box!")
			return
		end
		local player = minetest.get_player_by_name(name)
		boxes.close_box(player)
		players.return_to_lobby(player)
	end,
})

minetest.register_chatcommand("open", {
	params = "",
	description = "Open the current exit.",
	privs = {server = true},
	func = function(name, param)
		local box = boxes.players_in_boxes[name]
		if not box then
			minetest.chat_send_player(name, "You are not in a box!")
			return
		end
		if box.exit_doors[1] == nil then
			minetest.chat_send_player(name, "There are no more exits to open!")
			return
		end
		if box.open_doors[1] ~= nil then
			minetest.chat_send_player(name, "This box already has an open door!")
			return
		end
		local player = minetest.get_player_by_name(name)
		boxes.open_exit(player)
	end,
})

-- This is only still needed if we want to change the size, the entry, or the
-- exit of the lobbies; changing the contents can be done by /edite.

local lobby_updates = {}
minetest.register_chatcommand("update_lobby", {
	params = "entry|exit",
	description = "Set corresponding lobby. Use without parameter to start \
		updating a lobby, then punch both corners of the lobby and the bottom node \
		of the exit. In the case of the entry lobby, stand at its spawnpoint to run \
		the command.",
	privs = {server = true},
	func = function(name, param)
		if param ~= "entry" and param ~= "exit" and param ~= "" then
			return
		end

		if param == "" then
			lobby_updates[name] = {}
		elseif not lobby_updates[name] then
			minetest.chat_send_player(name, "Not all positions have been set.")
			return
		else
			local pos1 = lobby_updates[name].pos1
			local pos2 = lobby_updates[name].pos2
			local pos3 = lobby_updates[name].pos3
			if not pos1 or not pos2 or not pos3 then
				minetest.chat_send_player(name, "Not all positions have been set.")
				return
			end
			local minp = vector.min(pos1, pos2)
			local maxp = vector.max(pos1, pos2)
			local data = boxes.save(minp, maxp)
			local p3 = vector.subtract(pos3, minp)
			if param == "exit" then
				local player = minetest.get_player_by_name(name)
				local exit = vector.subtract(vector.round(player:get_pos()), minp)
				-- Exit lobby is hardcoded as id 1 for now
				db.box_set_data(1, data)
				db.box_set_meta(1, {
					type = db.EXIT_TYPE,
					meta = {
						size = vector.add(vector.subtract(maxp, minp), 1),
						entry = p3,
						exit = exit,
					}
				})
			else
				local player = minetest.get_player_by_name(name)
				local entry = vector.subtract(vector.round(player:get_pos()), minp)
				p3.x = p3.x + 1
				-- Entry lobby is hardcoded as id 0 for now
				db.box_set_data(0, data)
				db.box_set_meta(0, {
					type = db.ENTRY_TYPE,
					meta = {
						size = vector.add(vector.subtract(maxp, minp), 1),
						entry = entry,
						exit = p3,
					}
				})
			end
			minetest.chat_send_player(name, "Updated.")
			lobby_updates[name] = nil
		end
	end,
})

minetest.register_on_punchnode(function(pos, node, puncher, pointed_thing)
	if not puncher then return end
	local name = puncher:get_player_name()
	if not lobby_updates[name] then return end
	if not lobby_updates[name].pos1 then
		lobby_updates[name].pos1 = pos
		minetest.chat_send_player(name, "Position 1 set to " .. dump(pos) .. ".")
	elseif not lobby_updates[name].pos2 then
		lobby_updates[name].pos2 = pos
		minetest.chat_send_player(name, "Position 2 set to " .. dump(pos) .. ".")
	elseif not lobby_updates[name].pos3 then
		lobby_updates[name].pos3 = pos
		minetest.chat_send_player(name, "Position 3 set to " .. dump(pos) .. ".")
	end
end)


local digits = {[0] =
	{ true,  true,  true,
	  true, false,  true,
	  true, false,  true,
	  true, false,  true,
	  true,  true,  true,
	},
	{false, false,  true,
	 false, false,  true,
	 false, false,  true,
	 false, false,  true,
	 false, false,  true,
	},
	{ true,  true,  true,
	 false, false,  true,
	  true,  true,  true,
	  true, false, false,
	  true,  true,  true,
	},
	{ true,  true,  true,
	 false, false,  true,
	  true,  true,  true,
	 false, false,  true,
	  true,  true,  true,
	},
	{ true, false,  true,
	  true, false,  true,
	  true,  true,  true,
	 false, false,  true,
	 false, false,  true,
	},
	{ true,  true,  true,
	  true, false, false,
	  true,  true,  true,
	 false, false,  true,
	  true,  true,  true,
	},
	{ true,  true,  true,
	  true, false, false,
	  true,  true,  true,
	  true, false,  true,
	  true,  true,  true,
	},
	{ true,  true,  true,
	 false, false,  true,
	 false, false,  true,
	 false, false,  true,
	 false, false,  true,
	},
	{ true, true,  true,
	  true, false,  true,
	  true,  true,  true,
	  true, false,  true,
	  true,  true,  true,
	},
	{ true,  true,  true,
	  true, false,  true,
	  true,  true,  true,
	 false, false,  true,
	  true,  true,  true,
	},
}

function boxes.make_new(player, size)
	local minp = boxes.valloc(size + 2)
	local maxp = vector.add(minp, size + 1)

	-- Create the box
	local cid_air = minetest.get_content_id("air")
	local cid_wall = minetest.get_content_id("nodes:marbleb")
	local cid_digit = minetest.get_content_id("nodes:bronzeb")
	local cid_barrier = minetest.get_content_id("nodes:barrier")

	local vm = minetest.get_voxel_manip(minp, maxp)
	local emin, emax = vm:get_emerged_area()
	local va = VoxelArea:new{MinEdge=emin,MaxEdge=emax}
	local vmdata = vm:get_data()
	local param2 = vm:get_param2_data()

	-- Set to air
	for z = minp.z, maxp.z do
		for y = minp.y, maxp.y do
			local index = va:index(minp.x, y, z)
			for x = minp.x, maxp.x do
				vmdata[index] = cid_air
				param2[index] = 0
				index = index + 1
			end
		end
	end

	-- Add stone for walls and barrier at the top
	for z = minp.z, maxp.z do
		local index = va:index(minp.x, minp.y, z)
		local index2 = va:index(minp.x, maxp.y, z)
		for x = minp.x, maxp.x do
			vmdata[index] = cid_wall
			vmdata[index2] = cid_barrier
			index = index + 1
			index2 = index2 + 1
		end
	end
	for y = minp.y, maxp.y do
		local index = va:index(minp.x, y, minp.z)
		local index2 = va:index(minp.x, y, maxp.z)
		for x = minp.x, maxp.x do
			vmdata[index] = cid_wall
			vmdata[index2] = cid_wall
			index = index + 1
			index2 = index2 + 1
		end
	end
	local ystride = emax.x - emin.x + 1
	for z = minp.z, maxp.z do
		local index = va:index(minp.x, minp.y, z)
		local index2 = va:index(maxp.x, minp.y, z)
		for y = minp.y, maxp.y do
			vmdata[index] = cid_wall
			vmdata[index2] = cid_wall
			index = index + ystride
			index2 = index2 + ystride
		end
	end

	local box_id = db.get_last_box_id() + 1

	-- Write the box id
	local id_string = tostring(box_id)
	local id_sz = 4 * string.len(id_string) - 1
	if size < 6 or size < id_sz + 2 then
		minetest.log("error", "boxes.make_new(" .. size .. "): box size too small")
	else
		local xoff = minp.x + math.floor((size + 2 - id_sz) / 2)
		local yoff = minp.y + math.floor((size + 2 - 5 + 1) / 2)
		local n = string.len(id_string)
		for i = 1, string.len(id_string) do
			for dx = 0, 2 do
				for dy = 0, 4 do
					if digits[string.byte(id_string, n - i + 1) - 48][3-dx+3*(4-dy)] then
						local index = va:index(xoff + dx, yoff + dy, minp.z)
						vmdata[index] = cid_digit
					end
				end
			end
			xoff = xoff + 4
		end
	end

	vm:set_data(vmdata)
	vm:set_param2_data(param2)
	vm:update_liquids()
	vm:write_to_map()
	vm:update_map()

	local s2 = math.floor(size / 2)
	local entry = {x = 0, y = 1, z = s2 + 1}
	local exit = {x = size + 2, y = 1, z = s2 + 1}
	local sz = {x = size + 2, y = size + 2, z = size + 2}
	local meta = {
		type = db.BOX_TYPE,
		meta = {
			entry = entry,
			exit = exit,
			size = sz,
			num_items = 0,
			box_name = "(No name)",
			builder = player:get_player_name(),
			build_time = 0,
			skybox = 0,
		}
	}

	player:set_pos(vector.add(minp, {x = 1, y = 1, z = s2 + 1}))
	players.give_edit_inventory(player)
	db.box_set_meta(box_id, meta)
	db.box_set_data(box_id, boxes.save(minp, maxp))
	boxes.players_editing_boxes[player:get_player_name()] = {
		box_id = box_id,
		minp = minp,
		maxp = maxp,
		num_items = 0,
		entry = vector.add(minp, entry),
		exit = vector.add(minp, exit),
		start_edit_time = minetest.get_gametime(),
		box_name = "",
		skybox = 0,
	}
end

minetest.register_privilege("create", "Can create new boxes")

minetest.register_chatcommand("create", {
	params = "<box_size>",
	description = "Start editing a new box.",
	privs = {create = true},
	func = function(name, param)
		if boxes.players_editing_boxes[name] or boxes.players_in_boxes[name] then
			minetest.chat_send_player(name, "You are already editing a box!")
			return
		end

		local size = tonumber(param)
		if not size or size ~= math.floor(size) or size <= 0 then
			minetest.chat_send_player(name, "Please specify a size.")
			return
		end

		if size < 20 or size > 40 then
			minetest.chat_send_player(name, "Size is not in the allowed range [20, 40]")
			return
		end

		boxes.make_new(minetest.get_player_by_name(name), size)
	end,
})

minetest.register_chatcommand("edit", {
	params = "",
	description = "DEPRECATED",
	privs = {server = true},
	func = function(name, param)
		minetest.chat_send_player(name, "Did you mean /create or /edite?")
	end,
})


minetest.register_chatcommand("edite", {
	params = "<box_id>",
	description = "Edit an existing box.",
	privs = {create = true},
	func = function(name, param)
		if boxes.players_editing_boxes[name] or boxes.players_in_boxes[name] then
			minetest.chat_send_player(name, "You are already editing a box!")
			return
		end

		local id = tonumber(param)
		if not id or id ~= math.floor(id) or id < 0 then
			minetest.chat_send_player(name, "The id you supplied is not a nonnegative integer.")
			return
		end

		local meta = db.box_get_meta(id)
		if not meta then
			minetest.chat_send_player(name, "The id you supplied is not in the database.")
			return
		end

		if meta.meta.builder ~= name and not minetest.check_player_privs(name, "server") then
			minetest.chat_send_player(name, "You are not allowed to edit this box.")
			return
		end

		local player = minetest.get_player_by_name(name)
		local minp = boxes.valloc(math.max(meta.meta.size.x, meta.meta.size.z))
		local maxp = vector.add(minp, vector.subtract(meta.meta.size, 1))

		boxes.players_editing_boxes[name] = {
			box_id = id,
			minp = minp,
			maxp = maxp,
			num_items = meta.meta.num_items,
			entry = vector.add(minp, meta.meta.entry),
			exit = vector.add(minp, meta.meta.exit),
			start_edit_time = minetest.get_gametime(),
			box_name = meta.meta.box_name,
			skybox = meta.meta.skybox,
		}
		boxes.load(minp, id, player)
		local spawnpoint = vector.add({x = 1, y = 0, z = 0}, vector.add(minp, meta.meta.entry))
		player:set_pos(spawnpoint)
		players.give_edit_inventory(player)
	end,
})

function boxes.save_edit(player, id)
	local name = player:get_player_name()
	local box = boxes.players_editing_boxes[name]
	if not box then return end

	local bmeta = db.box_get_meta(box.box_id)
	if id == nil then
		id = box.box_id
	end

	db.box_set_data(id, boxes.save(box.minp, box.maxp))
	bmeta.meta.num_items = box.num_items
	bmeta.meta.entry = vector.subtract(box.entry, box.minp)
	bmeta.meta.exit = vector.subtract(box.exit, box.minp)
	bmeta.meta.box_name = box.box_name
	if box.box_name == "" then
		bmeta.meta.box_name = "(No name)"
	end
	bmeta.meta.skybox = box.skybox
	local t = minetest.get_gametime()
	if name == bmeta.meta.builder then -- Do not count admin edit times
		bmeta.meta.build_time = bmeta.meta.build_time + t - box.start_edit_time
		box.start_edit_time = t
	end
	db.box_set_meta(id, bmeta)

	minetest.log("action", name .. " saved box " .. id)
	minetest.chat_send_player(name, "Box " .. id .. " saved successfully")
end

function boxes.stop_edit(player)
	local name = player:get_player_name()
	local box = boxes.players_editing_boxes[name]
	if not box then return end

	boxes.cleanup(box.minp, box.maxp)
	boxes.vfree(box.minp)
	boxes.players_editing_boxes[name] = nil
end

minetest.register_chatcommand("setbuilder", {
	params = "<id> <name>",
	description = "Set the builder of the box <id> to <name>.",
	privs = {server = true},
	func = function(name, param)
		local box_id, nname = string.match(param, "^([^ ]+) +(.+)$")
		box_id = tonumber(box_id)
		local bmeta = db.box_get_meta(box_id)
		if not bmeta then
			minetest.chat_send_player(name, "Supplied box id does not exist!")
			return
		end
		if bmeta.type ~= db.BOX_TYPE then
			minetest.chat_send_player(name, "This id does not correspond to a box.")
			return
		end
		bmeta.meta.builder = nname
		db.box_set_meta(box_id, bmeta)
		minetest.chat_send_player(name, "Done.")
	end,
})

minetest.register_chatcommand("save", {
	params = "[<id>]",
	description = "Save the box you are currently editing. If id is supplied, a copy is" ..
			"instead saved to the box numbered id.",
	privs = {server = true},
	func = function(name, param)
		if not boxes.players_editing_boxes[name] then
			minetest.chat_send_player(name, "You are not currently editing a box!")
			return
		end

		local box_id = nil
		if param ~= "" then
			local id = tonumber(param)
			if not id or id ~= math.floor(id) or id < 0 then
				minetest.chat_send_player(name, "The id you supplied is not a non-negative number.")
				return
			end
			box_id = id
		end

		boxes.save_edit(minetest.get_player_by_name(name), box_id)
	end,
})

minetest.register_chatcommand("stopedit", {
	params = "",
	description = "Stop editing a box.",
	privs = {server = true},
	func = function(name, param)
		if not boxes.players_editing_boxes[name] then
			minetest.chat_send_player(name, "You are not currently editing a box!")
			return
		end

		local player = minetest.get_player_by_name(name)
		boxes.save_edit(player)
		boxes.stop_edit(player)
		players.return_to_lobby(player)
	end,
})

local function on_leaveplayer(player)
	minetest.log("action", player:get_player_name() .. " left the game")
	boxes.close_box(player)
	boxes.save_edit(player)
	boxes.stop_edit(player)
end

minetest.register_on_leaveplayer(on_leaveplayer)
minetest.register_on_shutdown(function()
		for _, player in ipairs(minetest.get_connected_players()) do
			on_leaveplayer(player)
		end
		db.shutdown()
end)

minetest.register_on_respawnplayer(function(player)
	local name = player:get_player_name()
	if boxes.players_in_boxes[name] then
		local box = boxes.players_in_boxes[name]
		player:setpos(box.respawn)
	elseif boxes.players_editing_boxes[name] then
		local box = boxes.players_editing_boxes[name]
		player:setpos(vector.add(box.entry, {x = 1, y = 0, z = 0}))
	else
		players.return_to_lobby(player)
	end
	return true
end)

minetest.register_on_dieplayer(function(player)
	local name = player:get_player_name()
	local box = boxes.players_in_boxes[name]
	if box and box.deaths then
		box.deaths = box.deaths + 1
	end
end)

minetest.register_on_player_hpchange(function(player, hp_change)
	local name = player:get_player_name()
	local box = boxes.players_in_boxes[name]
	if box and box.damage and hp_change < 0 then
		box.damage = box.damage - hp_change
	end
end, false)

function boxes.can_edit(player)
	local name = player:get_player_name()
	if boxes.players_editing_boxes[name] then
		return true
	end
	if boxes.players_in_boxes[name] then
		return false
	end
	return minetest.check_player_privs(name, "server")
end


local metadata_updates = {}
minetest.register_on_punchnode(function(pos, node, puncher, pointed_thing)
		if not puncher then return end
		local name = puncher:get_player_name()
		if not metadata_updates[name] then return end
		if not boxes.players_editing_boxes[name] then return end
		local box = boxes.players_editing_boxes[name]
		local p = vector.subtract(pos, box.minp)
		local upd = metadata_updates[name]
		local key = upd.update_key
		local bmeta = db.box_get_meta(box.box_id)
		if upd.update_type == "set" then
			bmeta.meta[key] = p
			db.box_set_meta(box.box_id, bmeta)
			metadata_updates[name] = nil
			sfinv.set_player_inventory_formspec(puncher)
		elseif upd.update_type == "add" then
			bmeta.meta[key][#bmeta.meta[key] + 1] = p
			db.box_set_meta(box.box_id, bmeta)
			sfinv.set_player_inventory_formspec(puncher)
		end
end)

local meta_types = {
	[db.BOX_TYPE] = {
		{key_name = "builder", type = "text"},
	},
	[db.ENTRY_TYPE] = {},
	[db.EXIT_TYPE] = {
		{key_name = "signs_to_update", type = "poslist"}
	}
}

sfinv.register_page("boxes:admin", {
	title = "Admin",
	is_in_nav = function(self, player, context)
		return minetest.check_player_privs(player, "server") and
			boxes.players_editing_boxes[player:get_player_name()]
	end,
	get = function(self, player, context)
		local name = player:get_player_name()
		local box = boxes.players_editing_boxes[name]
		local upd = metadata_updates[name]
		local bmeta = db.box_get_meta(box.box_id)
		local form = ""
		local y = 0
		for i, setting in ipairs(meta_types[bmeta.type]) do
			local current_value = bmeta.meta[setting.key_name]
			if setting.type == "text" then
				form = form .. "field[0.3," .. (y + 0.8) .. ";5,1;" ..
					tostring(i) .. ";" .. setting.key_name .. ";" ..
					minetest.formspec_escape(current_value) .. "]" ..
					"field_close_on_enter[" .. tostring(i) .. ";false]"
				y = y + 1.2
			elseif setting.type == "number" then
				form = form .. "field[0.3," .. (y + 0.8) .. ";5,1;" ..
					tostring(i) .. ";" .. setting.key_name .. ";" ..
					tostring(current_value) .. "]" ..
					"field_close_on_enter[" .. tostring(i) .. ";false]"
				y = y + 1.2
			elseif setting.type == "pos" then
				local blab = "Edit"
				if upd and upd.update_key == setting.key_name then
					blab = "Cancel edit"
				end
				form = form .. "label[0," .. (y + 0.3) .. ";" ..
					minetest.formspec_escape(setting.key_name .. ": " .. minetest.pos_to_string(current_value)) .. "]"
				form = form .. "button[0," .. (y + 0.7) .. ";3,1;" ..
					tostring(i) .. ";" .. blab .. "]"
				y = y + 1.6
			elseif setting.type == "poslist" then
				local blab = "Edit"
				if upd and upd.update_key == setting.key_name then
					blab = "Stop edit"
				end
				local cvs = "{"
				for i, pos in ipairs(current_value) do
					if i > 1 then
						cvs = cvs .. ", "
					end
					cvs = cvs .. minetest.pos_to_string(pos)
				end
				cvs = cvs .. "}"
				form = form .. "label[0," .. (y + 0.3) .. ";" ..
					minetest.formspec_escape(setting.key_name .. ": " .. cvs) .. "]"
				form = form .. "button[0," .. (y + 0.7) .. ";3,1;" ..
					tostring(i) .. ";" .. blab .. "]"
				y = y + 1.6
			end
		end
		return sfinv.make_formspec(player, context, form, false)
	end,
	on_player_receive_fields = function(self, player, context, fields)
		if not minetest.check_player_privs(player, "server") then
			return
		end

		local update = false

		local name = player:get_player_name()
		local box = boxes.players_editing_boxes[name]
		local bmeta = db.box_get_meta(box.box_id)
		local settings = meta_types[bmeta.type]
		for index, value in pairs(fields) do
			local i = tonumber(index)
			if i ~= nil then
				local setting = settings[i]
				if setting.type == "number" then
					value = tonumber(value)
				end
				if value ~= nil and setting.type ~= "pos" and setting.type ~= "poslist" then
					bmeta.meta[setting.key_name] = value
				elseif setting.type == "pos" or setting.type == "poslist" then
					if metadata_updates[name] and metadata_updates[name].update_key == setting.key_name then
						metadata_updates[name] = nil
					else
						if setting.type == "poslist" then
							bmeta.meta[setting.key_name] = {}
						end
						metadata_updates[name] = {
							update_type = (setting.type == "pos" and "set" or "add"),
							update_key = setting.key_name
						}
					end
					update = true
			  end
			end
		end
		db.box_set_meta(box.box_id, bmeta)

		if update then
			sfinv.set_page(player, "boxes:admin")
		end
	end,
})


--[[

-- Handle box expositions
-- These are boxes whose inside can be seen by the players before entering them
-- Proof of concept for now, so only one such box.

local box_expo_minp = {x = 5, y = 0, z = 5}
local box_expo_size = {x = 22, y = 22, z = 22}


minetest.register_chatcommand("expo", {
	params = "<box_id>",
	description = "Select the chosen box for exposition",
	privs = {server = true},
	func = function(name, param)
		local id = tonumber(param)
		if not id or id ~= math.floor(id) or id < 0 then
			minetest.chat_send_player(name, "The id you supplied is not a nonnegative integer.")
			return
		end

		local meta = db.box_get_meta(id)
		if not meta then
			minetest.chat_send_player(name, "The id you supplied is not in the database.")
			return
		end
		if meta.type ~= db.BOX_TYPE then
			minetest.chat_send_player(name, "The id you supplied does not correspond to a box.")
			return
		end

		local size = meta.meta.size
		if not vector.equals(size, box_expo_size) then
			minetest.chat_send_player(name, "The box you chose does not have the correct size.")
			return
		end

		boxes.load(box_expo_minp, id, nil)
		-- Open up a side

		local minp = vector.add(box_expo_minp, {x = 1, y = 1, z = size.z - 1})
		local maxp = vector.add(box_expo_minp, {x = size.x - 2, y = size.y - 1, z = size.z - 1})

		local cid_barrier = minetest.get_content_id("nodes:barrier")

		local vm = minetest.get_voxel_manip(minp, maxp)
		local emin, emax = vm:get_emerged_area()
		local va = VoxelArea:new{MinEdge=emin,MaxEdge=emax}
		local vmdata = vm:get_data()

		for y = minp.y, maxp.y do
			local index = va:index(minp.x, y, maxp.z)
			for x = minp.x, maxp.x do
				vmdata[index] = cid_barrier
				index = index + 1
			end
		end

		vm:set_data(vmdata)
		vm:write_to_map()
		vm:update_map()

	end,
})

]]