-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local configmanager = require "prosody.core.configmanager";

local modulemanager = require "prosody.core.modulemanager";

local events_new = require "prosody.util.events".new;

local disco_items = require "prosody.util.multitable".new();

local NULL = {};

local log = require "prosody.util.logger".init("hostmanager");

local hosts = prosody.hosts;

local prosody_events = prosody.events;

if not _G.prosody.incoming_s2s then

	require "prosody.core.s2smanager";

end

local incoming_s2s = _G.prosody.incoming_s2s;

local core_route_stanza = _G.prosody.core_route_stanza;

local pairs, rawget = pairs, rawget;

local tostring, type = tostring, type;

local setmetatable = setmetatable;

local _ENV = nil;

-- luacheck: std none

local host_mt = { }

function host_mt:__tostring()

	if self.type == "component" then

		local typ = configmanager.get(self.host, "component_module");

		if typ == "component" then

			return ("Component %q"):format(self.host);

		end

		return ("Component %q %q"):format(self.host, typ);

	elseif self.type == "local" then

		return ("VirtualHost %q"):format(self.host);

	end

end

local hosts_loaded_once;

local activate, deactivate;

local function load_enabled_hosts(config)

	local defined_hosts = config or configmanager.getconfig();

	local activated_any_host;

	for host, host_config in pairs(defined_hosts) do

		if host ~= "*" and host_config.enabled ~= false then

			if not host_config.component_module then

				activated_any_host = true;

			end

			activate(host, host_config);

		end

	end

	if not activated_any_host then

		log("error", "No active VirtualHost entries in the config file. This may cause unexpected behaviour as no modules will be loaded.");

	end

	prosody_events.fire_event("hosts-activated", defined_hosts);

	hosts_loaded_once = true;

end

prosody_events.add_handler("server-starting", load_enabled_hosts);

local function host_send(stanza)

	core_route_stanza(nil, stanza);

end

function activate(host, host_config)

	if rawget(hosts, host) then return nil, "The host "..host.." is already activated"; end

	host_config = host_config or configmanager.getconfig()[host];

	if not host_config then return nil, "Couldn't find the host "..tostring(host).." defined in the current config"; end

	local host_session = {

		host = host;

		s2sout = {};

		events = events_new();

		send = host_send;

		modules = {};

	};

	function host_session:close(reason)

		log("debug", "Attempt to close host session %s with reason: %s", self.host, reason);

	end

	setmetatable(host_session, host_mt);

	if not host_config.component_module then -- host

		host_session.type = "local";

		host_session.sessions = {};

	else -- component

		host_session.type = "component";

	end

	hosts[host] = host_session;

	if not host_config.disco_hidden and not host:match("[@/]") then

		disco_items:set(host:match("%.(.*)") or "*", host, host_config.name or true);

	end

	for option_name in pairs(host_config) do

		if option_name:match("_ports$") or option_name:match("_interface$") then

			log("warn", "%s: Option '%s' has no effect for virtual hosts - put it in the server-wide section instead", host, option_name);

		end

	end

	log((hosts_loaded_once and "info") or "debug", "Activated host: %s", host);

	prosody_events.fire_event("host-activated", host);

	return true;

end

function deactivate(host, reason)

	local host_session = hosts[host];

	if not host_session then return nil, "The host "..tostring(host).." is not activated"; end

	log("info", "Deactivating host: %s", host);

	prosody_events.fire_event("host-deactivating", { host = host, host_session = host_session, reason = reason });

	if type(reason) ~= "table" then

		reason = { condition = "host-gone", text = tostring(reason or "This server has stopped serving "..host) };

	end

	-- Disconnect local users, s2s connections

	-- TODO: These should move to mod_c2s and mod_s2s (how do they know they're being unloaded and not reloaded?)

	if host_session.sessions then

		for username, user in pairs(host_session.sessions) do

			for resource, session in pairs(user.sessions) do

				log("debug", "Closing connection for %s@%s/%s", username, host, resource);

				session:close(reason);

			end

		end

	end

	if host_session.s2sout then

		for remotehost, session in pairs(host_session.s2sout) do

			if session.close then

				log("debug", "Closing outgoing connection to %s", remotehost);

				session:close(reason);

			end

		end

	end

	for remote_session in pairs(incoming_s2s) do

		if remote_session.to_host == host then

			log("debug", "Closing incoming connection from %s", remote_session.from_host or "<unknown>");

			remote_session:close(reason);

		end

	end

	-- TODO: This should be done in modulemanager

	if host_session.modules then

		for module in pairs(host_session.modules) do

			modulemanager.unload(host, module);

		end

	end

	hosts[host] = nil;

	if not host:match("[@/]") then

		disco_items:remove(host:match("%.(.*)") or "*", host);

	end

	prosody_events.fire_event("host-deactivated", host);

	log("info", "Deactivated host: %s", host);

	return true;

end

local function get_children(host)

	return disco_items:get(host) or NULL;

end

return {

	activate = activate;

	deactivate = deactivate;

	get_children = get_children;

}