local startup = {};

local prosody = { events = require "util.events".new() };

local config = require "core.configmanager";

local dependencies = require "util.dependencies";

function startup.read_config()

	local filenames = {};

	local filename;

	if arg[1] == "--config" and arg[2] then

		table.insert(filenames, arg[2]);

		if CFG_CONFIGDIR then

			table.insert(filenames, CFG_CONFIGDIR.."/"..arg[2]);

		end

		table.remove(arg, 1); table.remove(arg, 1);

	elseif os.getenv("PROSODY_CONFIG") then -- Passed by prosodyctl

			table.insert(filenames, os.getenv("PROSODY_CONFIG"));

	else

		table.insert(filenames, (CFG_CONFIGDIR or ".").."/prosody.cfg.lua");

	end

	for _,_filename in ipairs(filenames) do

		filename = _filename;

		local file = io.open(filename);

		if file then

			file:close();

			prosody.config_file = filename;

			CFG_CONFIGDIR = filename:match("^(.*)[\\/][^\\/]*$");

			break;

		end

	end

	prosody.config_file = filename

	local ok, level, err = config.load(filename);

	if not ok then

		print("\n");

		print("**************************");

		if level == "parser" then

			print("A problem occured while reading the config file "..filename);

			print("");

			local err_line, err_message = tostring(err):match("%[string .-%]:(%d*): (.*)");

			if err:match("chunk has too many syntax levels$") then

				print("An Include statement in a config file is including an already-included");

				print("file and causing an infinite loop. An Include statement in a config file is...");

			else

				print("Error"..(err_line and (" on line "..err_line) or "")..": "..(err_message or tostring(err)));

			end

			print("");

		elseif level == "file" then

			print("Prosody was unable to find the configuration file.");

			print("We looked for: "..filename);

			print("A sample config file is included in the Prosody download called prosody.cfg.lua.dist");

			print("Copy or rename it to prosody.cfg.lua and edit as necessary.");

		end

		print("More help on configuring Prosody can be found at https://prosody.im/doc/configure");

		print("Good luck!");

		print("**************************");

		print("");

		os.exit(1);

	end

end

function startup.check_dependencies()

	if not dependencies.check_dependencies() then

		os.exit(1);

	end

end

-- luacheck: globals socket server

function startup.load_libraries()

	-- Load socket framework

	-- luacheck: ignore 111/server 111/socket

	socket = require "socket";

	server = require "net.server"

end

-- The global log() gets defined by loggingmanager

-- luacheck: ignore 113/log

function startup.init_logging()

	-- Initialize logging

	require "core.loggingmanager"

end

function startup.log_dependency_warnings()

	dependencies.log_warnings();

end

function startup.sanity_check()

	for host, host_config in pairs(config.getconfig()) do

		if host ~= "*"

		and host_config.enabled ~= false

		and not host_config.component_module then

			return;

		end

	end

	log("error", "No enabled VirtualHost entries found in the config file.");

	log("error", "At least one active host is required for Prosody to function. Exiting...");

	os.exit(1);

end

function startup.sandbox_require()

	-- Replace require() with one that doesn't pollute _G, required

	-- for neat sandboxing of modules

	-- luacheck: ignore 113/getfenv 111/require

	local _realG = _G;

	local _real_require = require;

	local getfenv = getfenv or function (f)

		-- FIXME: This is a hack to replace getfenv() in Lua 5.2

		local name, env = debug.getupvalue(debug.getinfo(f or 1).func, 1);

		if name == "_ENV" then

			return env;

		end

	end

	function require(...)

		local curr_env = getfenv(2);

		local curr_env_mt = getmetatable(curr_env);

		local _realG_mt = getmetatable(_realG);

		if curr_env_mt and curr_env_mt.__index and not curr_env_mt.__newindex and _realG_mt then

			local old_newindex, old_index;

			old_newindex, _realG_mt.__newindex = _realG_mt.__newindex, curr_env;

			old_index, _realG_mt.__index = _realG_mt.__index, function (_G, k) -- luacheck: ignore 212/_G

				return rawget(curr_env, k);

			end;

			local ret = _real_require(...);

			_realG_mt.__newindex = old_newindex;

			_realG_mt.__index = old_index;

			return ret;

		end

		return _real_require(...);

	end

end

function startup.set_function_metatable()

	local mt = {};

	function mt.__index(f, upvalue)

		local i, name, value = 0;

		repeat

			i = i + 1;

			name, value = debug.getupvalue(f, i);

		until name == upvalue or name == nil;

		return value;

	end

	function mt.__newindex(f, upvalue, value)

		local i, name = 0;

		repeat

			i = i + 1;

			name = debug.getupvalue(f, i);

		until name == upvalue or name == nil;

		if name then

			debug.setupvalue(f, i, value);

		end

	end

	function mt.__tostring(f)

		local info = debug.getinfo(f);

		return ("function(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.linedefined);

	end

	debug.setmetatable(function() end, mt);

end

function startup.detect_platform()

	prosody.platform = "unknown";

	if os.getenv("WINDIR") then

		prosody.platform = "windows";

	elseif package.config:sub(1,1) == "/" then

		prosody.platform = "posix";

	end

end

function startup.detect_installed()

	prosody.installed = nil;

	if CFG_SOURCEDIR and (prosody.platform == "windows" or CFG_SOURCEDIR:match("^/")) then

		prosody.installed = true;

	end

end

function startup.chdir()

	if prosody.installed then

		-- Change working directory to data path.

		require "lfs".chdir(data_path);

	end

end

function startup.init_global_state()

	prosody.bare_sessions = {};

	prosody.full_sessions = {};

	prosody.hosts = {};

	-- COMPAT: These globals are deprecated

	-- luacheck: ignore 111/bare_sessions 111/full_sessions 111/hosts

	bare_sessions = prosody.bare_sessions;

	full_sessions = prosody.full_sessions;

	hosts = prosody.hosts;

	local data_path = config.get("*", "data_path") or CFG_DATADIR or "data";

	local custom_plugin_paths = config.get("*", "plugin_paths");

	if custom_plugin_paths then

		local path_sep = package.config:sub(3,3);

		-- path1;path2;path3;defaultpath...

		CFG_PLUGINDIR = table.concat(custom_plugin_paths, path_sep)..path_sep..(CFG_PLUGINDIR or "plugins");

	end

	prosody.paths = { source = CFG_SOURCEDIR, config = CFG_CONFIGDIR or ".",

	                  plugins = CFG_PLUGINDIR or "plugins", data = data_path };

	prosody.arg = _G.arg;

	startup.detect_platform();

	startup.detect_installed();

	_G.prosody = prosody;

end

function startup.add_global_prosody_functions()

	-- Function to reload the config file

	function prosody.reload_config()

		log("info", "Reloading configuration file");

		prosody.events.fire_event("reloading-config");

		local ok, level, err = config.load(prosody.config_file);

		if not ok then

			if level == "parser" then

				log("error", "There was an error parsing the configuration file: %s", tostring(err));

			elseif level == "file" then

				log("error", "Couldn't read the config file when trying to reload: %s", tostring(err));

			end

		end

		return ok, (err and tostring(level)..": "..tostring(err)) or nil;

	end

	-- Function to reopen logfiles

	function prosody.reopen_logfiles()

		log("info", "Re-opening log files");

		prosody.events.fire_event("reopen-log-files");

	end

	-- Function to initiate prosody shutdown

	function prosody.shutdown(reason, code)

		log("info", "Shutting down: %s", reason or "unknown reason");

		prosody.shutdown_reason = reason;

		prosody.shutdown_code = code;

		prosody.events.fire_event("server-stopping", {

			reason = reason;

			code = code;

		});

		server.setquitting(true);

	end

end

function startup.load_secondary_libraries()

	--- Load and initialise core modules

	require "util.import"

	require "util.xmppstream"

	require "core.stanza_router"

	require "core.statsmanager"

	require "core.hostmanager"

	require "core.portmanager"

	require "core.modulemanager"

	require "core.usermanager"

	require "core.rostermanager"

	require "core.sessionmanager"

	package.loaded['core.componentmanager'] = setmetatable({},{__index=function()

		log("warn", "componentmanager is deprecated: %s", debug.traceback():match("\n[^\n]*\n[ \t]*([^\n]*)"));

		return function() end

	end});

	require "util.array"

	require "util.datetime"

	require "util.iterators"

	require "util.timer"

	require "util.helpers"

	pcall(require, "util.signal") -- Not on Windows

	-- Commented to protect us from

	-- the second kind of people

	--[[

	pcall(require, "remdebug.engine");

	if remdebug then remdebug.engine.start() end

	]]

	require "util.stanza"

	require "util.jid"

end

function startup.init_http_client()

	local http = require "net.http"

	local config_ssl = config.get("*", "ssl") or {}

	local https_client = config.get("*", "client_https_ssl")

	http.default.options.sslctx = require "core.certmanager".create_context("client_https port 0", "client",

		{ capath = config_ssl.capath, cafile = config_ssl.cafile, verify = "peer", }, https_client);

end

function startup.init_data_store()

	require "core.storagemanager";

end

function startup.prepare_to_start()

	log("info", "Prosody is using the %s backend for connection handling", server.get_backend());

	-- Signal to modules that we are ready to start

	prosody.events.fire_event("server-starting");

	prosody.start_time = os.time();

end

function startup.init_global_protection()

	-- Catch global accesses

	-- luacheck: ignore 212/t

	local locked_globals_mt = {

		__index = function (t, k) log("warn", "%s", debug.traceback("Attempt to read a non-existent global '"..tostring(k).."'", 2)); end;

		__newindex = function (t, k, v) error("Attempt to set a global: "..tostring(k).." = "..tostring(v), 2); end;

	};

	function prosody.unlock_globals()

		setmetatable(_G, nil);

	end

	function prosody.lock_globals()

		setmetatable(_G, locked_globals_mt);

	end

	-- And lock now...

	prosody.lock_globals();

end

function startup.read_version()

	-- Try to determine version

	local version_file = io.open((CFG_SOURCEDIR or ".").."/prosody.version");

	prosody.version = "unknown";

	if version_file then

		prosody.version = version_file:read("*a"):gsub("%s*$", "");

		version_file:close();

		if #prosody.version == 12 and prosody.version:match("^[a-f0-9]+$") then

			prosody.version = "hg:"..prosody.version;

		end

	else

		local hg = require"util.mercurial";

		local hgid = hg.check_id(CFG_SOURCEDIR or ".");

		if hgid then prosody.version = "hg:" .. hgid; end

	end

end

function startup.log_greeting()

	log("info", "Hello and welcome to Prosody version %s", prosody.version);

end

function startup.notify_started()

end

-- Override logging config (used by prosodyctl)

function startup.force_console_logging()

	local original_logging_config = config.get("*", "log");

	config.set("*", "log", { { levels = { min="info" }, to = "console" } });

end

function startup.switch_user()

	-- Switch away from root and into the prosody user --

	-- NOTE: This function is only used by prosodyctl.

	-- The prosody process is built with the assumption that

	-- it is already started as the appropriate user.

	local switched_user, current_uid;

	local want_pposix_version = "0.4.0";

	local have_pposix, pposix = pcall(require, "util.pposix");

	if have_pposix and pposix then

		if pposix._VERSION ~= want_pposix_version then

			print(string.format("Unknown version (%s) of binary pposix module, expected %s",

				tostring(pposix._VERSION), want_pposix_version));

			os.exit(1);

		end

		current_uid = pposix.getuid();

		local arg_root = arg[1] == "--root";

		if arg_root then table.remove(arg, 1); end

		if current_uid == 0 and config.get("*", "run_as_root") ~= true and not arg_root then

			-- We haz root!

			local desired_user = config.get("*", "prosody_user") or "prosody";

			local desired_group = config.get("*", "prosody_group") or desired_user;

			local ok, err = pposix.setgid(desired_group);

			if ok then

				ok, err = pposix.initgroups(desired_user);

			end

			if ok then

				ok, err = pposix.setuid(desired_user);

				if ok then

					-- Yay!

					switched_user = true;

				end

			end

			if not switched_user then

				-- Boo!

				print("Warning: Couldn't switch to Prosody user/group '"..tostring(desired_user).."'/'"..tostring(desired_group).."': "..tostring(err));

			else

				-- Make sure the Prosody user can read the config

				local conf, err, errno = io.open(ENV_CONFIG);

				if conf then

					conf:close();

				else

					print("The config file is not readable by the '"..desired_user.."' user.");

					print("Prosody will not be able to read it.");

					print("Error was "..err);

					os.exit(1);