-- for Prosody

-- via dersd

if module:get_host_type() ~= "component" then

	error(module.name.." should be loaded as a component, check out http://prosody.im/doc/components", 0);

end

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

local st = require "util.stanza";

local componentmanager = require "core.componentmanager";

local datamanager = require "util.datamanager";

local timer = require "util.timer";

local http = require "net.http";

local json = require "util.json";

local base64 = require "util.encodings".base64;

local component_host = module:get_host();

local component_name = module.name;

local data_cache = {};

function print_r(obj)

	return require("util.serialization").serialize(obj);

end

function dmsg(jid, msg)

	module:log("debug", msg or "nil");

	if jid ~= nil then

		module:send(st.message({to=jid, from=component_host, type='chat'}, msg or "nil"));

	end

end

function substring(string, start_string, ending_string)

	local s_value_start, s_value_finish = nil, nil;

	if start_string ~= nil then

		_, s_value_start = string:find(start_string);

		if s_value_start == nil then

			-- error

			return nil;

		end

	else

		return nil;

	end

	if ending_string ~= nil then

		_, s_value_finish = string:find(ending_string, s_value_start+1);

		if s_value_finish == nil then

			-- error

			return nil;

		end

	else

		s_value_finish = string:len()+1;

	end

	return string:sub(s_value_start+1, s_value_finish-1);

end

local http_timeout = 30;

local http_queue = setmetatable({}, { __mode = "k" }); -- auto-cleaning nil elements

data_cache['prosody_os'] = prosody.platform;

data_cache['prosody_version'] = prosody.version;

local http_headers = {

	["User-Agent"] = "Prosody ("..data_cache['prosody_version'].."; "..data_cache['prosody_os']..")" --"ELinks (0.4pre5; Linux 2.4.27 i686; 80x25)",

};

function http_action_callback(response, code, request, xcallback)

	if http_queue == nil or http_queue[request] == nil then return; end

	local id = http_queue[request];

	http_queue[request] = nil;

	if xcallback == nil then

		dmsg(nil, "http_action_callback reports that xcallback is nil");

	else

		xcallback(id, response, request);

	end

	return true;

end

function http_add_action(tid, url, method, post, fcallback)

	local request = http.request(url, { headers = http_headers or {}, body = http.formencode(post or {}), method = method or "GET" }, function(response_body, code, response, request) http_action_callback(response_body, code, request, fcallback) end);

	http_queue[request] = tid;

	timer.add_task(http_timeout, function() http.destroy_request(request); end);

	return true;

end

local users = setmetatable({}, {__mode="k"});

local user = {};

user.__index = user;

user.dosync = false;

user.valid = false;

user.data = {};

function user:login()

	userdata = datamanager.load(self.jid, component_host, "data");

	if userdata ~= nil then

		self.data = userdata;

		if self.data['_twitter_sess'] ~= nil then

			http_headers['Cookie'] = "_twitter_sess="..self.data['_twitter_sess']..";";

		end

		module:send(st.presence({to=self.jid, from=component_host}));

		self:twitterAction("VerifyCredentials");

		if self.data.dosync == 1 then

			self.dosync = true;

			timer.add_task(self.data.refreshrate, function() return users[self.jid]:sync(); end)

		end

	else

		module:send(st.message({to=self.jid, from=component_host, type='chat'}, "You are not signed in."));

	end

end

function user:logout()

	datamanager.store(self.jid, component_host, "data", self.data);

	self.dosync = false;

	module:send(st.presence({to=self.jid, from=component_host, type='unavailable'}));

end

function user:sync()

	if self.dosync then

		table.foreach(self.data.synclines, function(ind, line) self:twitterAction(line.name, {sinceid=line.sinceid}) end);

		return self.data.refreshrate;

	end

end

function user:signin()

	if datamanager.load(self.jid, component_host, "data") == nil then

		datamanager.store(self.jid, component_host, "data", {login=self.data.login, password=self.data.password, refreshrate=60, dosync=1, synclines={{name='HomeTimeline', sinceid=0}}, syncstatus=0})

		module:send(st.presence{to=self.jid, from=component_host, type='subscribe'});

		module:send(st.presence{to=self.jid, from=component_host, type='subscribed'});

	end

end

function user:signout()

	if datamanager.load(self.jid, component_host, "data") ~= nil then

		datamanager.store(self.jid, component_host, "data", nil);

		module:send(st.presence({to=self.jid, from=component_host, type='unavailable'}));

		module:send(st.presence({to=self.jid, from=component_host, type='unsubscribe'}));

		module:send(st.presence({to=self.jid, from=component_host, type='unsubscribed'}));

	end

end

local twitterApiUrl = "http://api.twitter.com";

local twitterApiVersion = "1";

local twitterApiDataType = "json";

local twitterActionUrl = function(action) return twitterApiUrl.."/"..twitterApiVersion.."/"..action.."."..twitterApiDataType end;

local twitterActionMap = {

	PublicTimeline = {

		url = twitterActionUrl("statuses/public_timeline"),

		method = "GET",

		needauth = false,

	},

	HomeTimeline = {

		url = twitterActionUrl("statuses/home_timeline"),

		method = "GET",

		needauth = true,

	},

	FriendsTimeline = {

		url = twitterActionUrl("statuses/friends_timeline"),

		method = "GET",

		needauth = true,

	},

	UserTimeline = {

		url = twitterActionUrl("statuses/friends_timeline"),

		method = "GET",

		needauth = true,

	},

	VerifyCredentials = {

		url = twitterActionUrl("account/verify_credentials"),

		method = "GET",

		needauth = true,

	},

	UpdateStatus = {

		url = twitterActionUrl("statuses/update"),

		method = "POST",

		needauth = true,

	},

	Retweet = {

		url = twitterActionUrl("statuses/retweet/%tweetid"),

		method = "POST",

		needauth = true,

	}

}

function user:twitterAction(line, params)

	local action = twitterActionMap[line];

	if action then

		local url = action.url;

		local post = {};

		--if action.needauth and not self.valid and line ~= "VerifyCredentials" then

		--	return

		--end

		if action.needauth then

			http_headers['Authorization'] = "Basic "..base64.encode(self.data.login..":"..self.data.password);

			--url = string.gsub(url, "http\:\/\/", string.format("http://%s:%s@", self.data.login, self.data.password));

		end

		if params and type(params) == "table" then

			post = params;

		end

		if action.method == "GET" and post ~= {} then

			url = url.."?"..http.formencode(post);

		end

		http_add_action(line, url, action.method, post, function(...) self:twitterActionResult(...) end);

	else

		module:send(st.message({to=self.jid, from=component_host, type='chat'}, "Wrong twitter action!"));

	end

end

local twitterActionResultMap = {

	PublicTimeline = {exec=function(jid, response)

		--module:send(st.message({to=jid, from=component_host, type='chat'}, print_r(response)));

		return

	end},

	HomeTimeline = {exec=function(jid, response)

		--module:send(st.message({to=jid, from=component_host, type='chat'}, print_r(response)));

		return

	end},

	FriendsTimeline = {function(jid, response)

		return

	end},

	UserTimeline = {exec=function(jid, response)

		return

	end},

	VerifyCredentials = {exec=function(jid, response)

		if response ~= nil and response.id ~= nil then

			users[jid].valid = true;

			users[jid].id = response.id;

		end

		return

	end},

	UpdateStatus = {exec=function(jid, response)

		return

	end},

	Retweet = {exec=function(jid, response)

		return

	end}

}

function user:twitterActionResult(id, response, request)

	if request ~= nil and request.responseheaders['set-cookie'] ~= nil and request.responseheaders['location'] ~= nil then

		--self.data['_twitter_sess'] = substring(request.responseheaders['set-cookie'], "_twitter_sess=", ";");

		--http_add_action(id, request.responseheaders['location'], "GET", {}, function(...) self:twitterActionResult(...) end);

		return true;

	end

	local result, tmp_json = pcall(function() json.decode(response or "{}") end);

	if result and id ~= nil then

		twitterActionResultMap[id]:exec(self.jid, tmp_json);

	end

	return true;

end

function iq_success(event)

	local origin, stanza = event.origin, event.stanza;

	local reply = data_cache.success;

	if reply == nil then

		reply = st.iq({type='result', from=stanza.attr.to or component_host});

		data_cache.success = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	origin.send(reply);

	return true;

end

function iq_disco_info(event)

	local origin, stanza = event.origin, event.stanza;

	local from = {};

	from.node, from.host, from.resource = jid_split(stanza.attr.from);

	local bjid = from.node.."@"..from.host;

	local reply = data_cache.disco_info;

	if reply == nil then

		reply = st.iq({type='result', from=stanza.attr.to or component_host}):query("http://jabber.org/protocol/disco#info")

				:tag("identity", {category='gateway', type='chat', name=component_name}):up();

		reply = reply:tag("feature", {var="urn:xmpp:receipts"}):up();

        reply = reply:tag("feature", {var="http://jabber.org/protocol/commands"}):up();

        reply = reply:tag("feature", {var="jabber:iq:register"}):up();

 		--reply = reply:tag("feature", {var="jabber:iq:time"}):up();

		--reply = reply:tag("feature", {var="jabber:iq:version"}):up();

        --reply = reply:tag("feature", {var="http://jabber.org/protocol/stats"}):up();

		data_cache.disco_info = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	origin.send(reply);

	return true;

end

function iq_disco_items(event)

	local origin, stanza = event.origin, event.stanza;

	local reply = data_cache.disco_items;

 	if reply == nil then

		reply = st.iq({type='result', from=stanza.attr.to or component_host}):query("http://jabber.org/protocol/disco#items");

		data_cache.disco_items = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	origin.send(reply);

	return true;

end

function iq_register(event)

	local origin, stanza = event.origin, event.stanza;

	if stanza.attr.type == "get" then

		local reply = data_cache.registration_form;

		if reply == nil then

			reply = st.iq({type='result', from=stanza.attr.to or component_host})

					:tag("query", { xmlns="jabber:iq:register" })

					:tag("instructions"):text("Enter your twitter data"):up()

					:tag("username"):up()

					:tag("password"):up();

			data_cache.registration_form = reply

		end

		reply.attr.id = stanza.attr.id;

		reply.attr.to = stanza.attr.from;

		origin.send(reply);

	elseif stanza.attr.type == "set" then

		local from = {};

		from.node, from.host, from.resource = jid_split(stanza.attr.from);

		local bjid = from.node.."@"..from.host;

		local username, password = "", "";

		local reply;

		for _, tag in ipairs(stanza.tags[1].tags) do

			if tag.name == "remove" then

				users[bjid]:signout();

				iq_success(event);

				return true;

			end

			if tag.name == "username" then

				username = tag[1];

			end

			if tag.name == "password" then

				password = tag[1];

			end

		end

		if username ~= nil and password ~= nil then

			users[bjid] = setmetatable({}, user);

			users[bjid].jid = bjid;

			users[bjid].data.login = username;

			users[bjid].data.password = password;

			users[bjid]:signin();

			users[bjid]:login();

		end

		iq_success(event);

		return true;

	end

end

function presence_stanza_handler(event)

	local origin, stanza = event.origin, event.stanza;

	local to = {};

	local from = {};

	local pres = {};

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

	from.node, from.host, from.resource = jid_split(stanza.attr.from);

	pres.type = stanza.attr.type;

	for _, tag in ipairs(stanza.tags) do pres[tag.name] = tag[1]; end

	local from_bjid = nil;

	if from.node ~= nil and from.host ~= nil then

		from_bjid = from.node.."@"..from.host;

	elseif from.host ~= nil then

		from_bjid = from.host;

	end

	if pres.type == nil then

		if users[from_bjid] ~= nil then

			-- Status change

			if pres['status'] ~= nil and users[from_bjid]['data']['sync_status'] then

				users[from_bjid]:twitterAction("UpdateStatus", {status=pres['status']});

			end

		else

			-- User login request

			users[from_bjid] = setmetatable({}, user);