-- Prosody IM

-- Copyright (C) 2008-2009 Matthew Wild

-- Copyright (C) 2008-2009 Waqas Hussain

-- 

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

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

--

local prosody = prosody;

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

local configmanager = require "core.configmanager";

local modulemanager = require "core.modulemanager";

local core_route_stanza = core_route_stanza;

local jid_split = require "util.jid".split;

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

local st = require "util.stanza";

local hosts = hosts;

local serialize = require "util.serialization".serialize

local pairs, type, tostring = pairs, type, tostring;

local components = {};

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

local NULL = {};

require "core.discomanager".addDiscoItemsHandler("*host", function(reply, to, from, node)

	if #node == 0 and hosts[to] then

		for jid in pairs(disco_items:get(to) or NULL) do

			reply:tag("item", {jid = jid}):up();

		end

		return true;

	end

end);

prosody.events.add_handler("server-starting", function () core_route_stanza = _G.core_route_stanza; end);

module "componentmanager"

local function default_component_handler(origin, stanza)

	log("warn", "Stanza being handled by default component, bouncing error");

	if stanza.attr.type ~= "error" then

		core_route_stanza(nil, st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable"));

	end

end

local components_loaded_once;

function load_enabled_components(config)

	local defined_hosts = config or configmanager.getconfig();

	for host, host_config in pairs(defined_hosts) do

		if host ~= "*" and ((host_config.core.enabled == nil or host_config.core.enabled) and type(host_config.core.component_module) == "string") then

			hosts[host] = { type = "component", host = host, connected = false, s2sout = {}, events = events_new() };

			components[host] = default_component_handler;

			local ok, err = modulemanager.load(host, host_config.core.component_module);

			if not ok then

				log("error", "Error loading %s component %s: %s", tostring(host_config.core.component_module), tostring(host), tostring(err));

			else

				log("debug", "Activated %s component: %s", host_config.core.component_module, host);

			end

		end

	end

end

prosody.events.add_handler("server-starting", load_enabled_components);

function handle_stanza(origin, stanza)

	local node, host = jid_split(stanza.attr.to);

	local component = nil;

	if host then

		if node then component = components[node.."@"..host]; end -- hack to allow hooking node@server

		if not component then component = components[host]; end

	end

	if component then

		log("debug", "%s stanza being handled by component: %s", stanza.name, host);

		component(origin, stanza, hosts[host]);

	else

		log("error", "Component manager recieved a stanza for a non-existing component: " .. (stanza.attr.to or serialize(stanza)));

	end

end

function create_component(host, component)

	-- TODO check for host well-formedness

	return { type = "component", host = host, connected = true, s2sout = {}, events = events_new() };

end

function register_component(host, component, session)

	if not hosts[host] or (hosts[host].type == 'component' and not hosts[host].connected) then

		local old_events = hosts[host] and hosts[host].events;

		components[host] = component;

		hosts[host] = session or create_component(host, component);

		-- Add events object if not already one

		if not hosts[host].events then

			hosts[host].events = old_events or events_new();

		end

		-- add to disco_items

		if not(host:find("@", 1, true) or host:find("/", 1, true)) and host:find(".", 1, true) then

			disco_items:set(host:sub(host:find(".", 1, true)+1), host, true);

		end

		-- FIXME only load for a.b.c if b.c has dialback, and/or check in config

		modulemanager.load(host, "dialback");

		log("debug", "component added: "..host);

		return session or hosts[host];

	else

		log("error", "Attempt to set component for existing host: "..host);

	end

end

function deregister_component(host)

	if components[host] then

		modulemanager.unload(host, "dialback");

		hosts[host].connected = nil;

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

		if host_config and ((host_config.core.enabled == nil or host_config.core.enabled) and type(host_config.core.component_module) == "string") then

			-- Set default handler

			components[host] = default_component_handler;

		else

			-- Component not in config, or disabled, remove

			hosts[host] = nil;

			components[host] = nil;

		end

		-- remove from disco_items

		if not(host:find("@", 1, true) or host:find("/", 1, true)) and host:find(".", 1, true) then

			disco_items:remove(host:sub(host:find(".", 1, true)+1), host);

		end

		log("debug", "component removed: "..host);

		return true;

	else

		log("error", "Attempt to remove component for non-existing host: "..host);

	end

end

function set_component_handler(host, handler)

	components[host] = handler;

end

return _M;