-- Minetest: builtin/misc.lua

local S = core.get_translator("__builtin")

--
-- Misc. API functions
--

-- @spec core.kick_player(String, String) :: Boolean
function core.kick_player(player_name, reason)
	if type(reason) == "string" then
		reason = "Kicked: " .. reason
	else
		reason = "Kicked."
	end
	return core.disconnect_player(player_name, reason)
end

function core.check_player_privs(name, ...)
	if core.is_player(name) then
		name = name:get_player_name()
	elseif type(name) ~= "string" then
		error("core.check_player_privs expects a player or playername as " ..
			"argument.", 2)
	end

	local requested_privs = {...}
	local player_privs = core.get_player_privs(name)
	local missing_privileges = {}

	if type(requested_privs[1]) == "table" then
		-- We were provided with a table like { privA = true, privB = true }.
		for priv, value in pairs(requested_privs[1]) do
			if value and not player_privs[priv] then
				missing_privileges[#missing_privileges + 1] = priv
			end
		end
	else
		-- Only a list, we can process it directly.
		for key, priv in pairs(requested_privs) do
			if not player_privs[priv] then
				missing_privileges[#missing_privileges + 1] = priv
			end
		end
	end

	if #missing_privileges > 0 then
		return false, missing_privileges
	end

	return true, ""
end


function core.send_join_message(player_name)
	if not core.is_singleplayer() then
		core.chat_send_all("*** " .. S("@1 joined the game.", player_name))
	end
end


function core.send_leave_message(player_name, timed_out)
	local announcement = "*** " .. S("@1 left the game.", player_name)
	if timed_out then
		announcement = "*** " .. S("@1 left the game (timed out).", player_name)
	end
	core.chat_send_all(announcement)
end


core.register_on_joinplayer(function(player)
	local player_name = player:get_player_name()
	if not core.is_singleplayer() then
		local status = core.get_server_status(player_name, true)
		if status and status ~= "" then
			core.chat_send_player(player_name, status)
		end
	end
	core.send_join_message(player_name)
end)


core.register_on_leaveplayer(function(player, timed_out)
	local player_name = player:get_player_name()
	core.send_leave_message(player_name, timed_out)
end)


function core.is_player(player)
	-- a table being a player is also supported because it quacks sufficiently
	-- like a player if it has the is_player function
	local t = type(player)
	return (t == "userdata" or t == "table") and
		type(player.is_player) == "function" and player:is_player()
end


function core.player_exists(name)
	return core.get_auth_handler().get_auth(name) ~= nil
end


-- Returns two position vectors representing a box of `radius` in each
-- direction centered around the player corresponding to `player_name`

function core.get_player_radius_area(player_name, radius)
	local player = core.get_player_by_name(player_name)
	if player == nil then
		return nil
	end

	local p1 = player:get_pos()
	local p2 = p1

	if radius then
		p1 = vector.subtract(p1, radius)
		p2 = vector.add(p2, radius)
	end

	return p1, p2
end


function core.hash_node_position(pos)
	return (pos.z + 32768) * 65536 * 65536
		 + (pos.y + 32768) * 65536
		 +  pos.x + 32768
end


function core.get_position_from_hash(hash)
	local x = (hash % 65536) - 32768
	hash  = math.floor(hash / 65536)