local logger = require "util.logger";

local log = logger.init("modulemanager")

local api = {}; -- Module API container

local modulemap = {};

local stanza_handlers = {};

function load(host, module_name, config)

	local mod, err = loadfile("plugins/mod_"..module_name..".lua");

		log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");

	if not modulemap[host] then

		modulemap[host] = {};

		stanza_handlers[host] = {};

	elseif modulemap[host][module_name] then

		log("warn", "%s is already loaded for %s, so not loading again", module_name, host);

		return nil, "module-already-loaded";

	end

	local _log = logger.init(host..":"..module_name);

	local api_instance = setmetatable({ name = module_name, host = host, config = config,  _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });

	local pluginenv = setmetatable({ module = api_instance }, { __index = _G });

	modulemap[host][module_name] = mod;

function handle_stanza(host, origin, stanza)

	local handlers = stanza_handlers[host];

	if not handlers then

		log("warn", "No handlers for %s", host);

		return false;

	end

----- API functions exposed to modules -----------

-- Must all be in api.* 

-- Returns the name of the current module

function api:get_name()

	return self.name;

end

-- Returns the host that the current module is serving

function api:get_host()

	return self.host;

end

local function _add_iq_handler(module, origin_type, xmlns, handler)

	local handlers = stanza_handlers[module.host];

	handlers[origin_type] = handlers[origin_type] or {};

	handlers[origin_type].iq = handlers[origin_type].iq or {};

	if not handlers[origin_type].iq[xmlns] then

		handlers[origin_type].iq[xmlns]= handler;

		handler_info[handler] = module;

		module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns);

	else

		module:log("warn", "I wanted to handle tag 'iq' [%s] with payload namespace '%s' but mod_%s already handles that", origin_type, xmlns, handler_info[handlers[origin_type].iq[xmlns]].name);

	end

end

function api:add_iq_handler(origin_type, xmlns, handler)

	if not (origin_type and handler and xmlns) then return false; end

	if type(origin_type) == "table" then

		for _, origin_type in ipairs(origin_type) do

			_add_iq_handler(self, origin_type, xmlns, handler);

		end

		return;

	end

	_add_iq_handler(self, origin_type, xmlns, handler);

end

	function api:add_event_hook(name, handler)

		self:log("debug", "Subscribed to %s", name);

local function _add_handler(module, origin_type, tag, xmlns, handler)

	local handlers = stanza_handlers[module.host];

	handlers[origin_type] = handlers[origin_type] or {};

	if not handlers[origin_type][tag] then

		handlers[origin_type][tag] = handlers[origin_type][tag] or {};

		handlers[origin_type][tag][xmlns]= handler;

		handler_info[handler] = module;

		module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns);

	elseif handler_info[handlers[origin_type][tag]] then

		log("warning", "I wanted to handle tag '%s' [%s] but mod_%s already handles that", tag, origin_type, handler_info[handlers[origin_type][tag]].module.name);

	end

end

function api:add_handler(origin_type, tag, xmlns, handler)

	if not (origin_type and tag and xmlns and handler) then return false; end

	if type(origin_type) == "table" then

		for _, origin_type in ipairs(origin_type) do

			_add_handler(self, origin_type, tag, xmlns, handler);

		end

		return;

	end

	_add_handler(self, origin_type, tag, xmlns, handler);

end

--------------------------------------------------------------------