local http = require "net.http";

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

local dataforms_new = require "util.dataforms".new;

local adhoc_new = module:require "adhoc".new;

local adhoc_simple_form = require "util.adhoc".new_simple_form;

local t_concat = table.concat;

local store = module:open_store();

local function api_handler(body, code)

	if code == 200 then

		module:log("debug", "SMS correctly sent.");

	elseif code == 0 then

		module:log("error", "error querying Free API: %s", body);

	elseif code >= 400 then

		module:log("warn", "received error code %d: %s", code, body);

	end

end

local function message_handler(event)

	local message = event.stanza;

	local username, host = jid_split(message.attr.to);

	-- Only proceed if the user has set Free credentials.

	local data = store:get(username);

	if not data then

		return;

	end

	-- Only proceed if the message is of type chat or normal.

	local message_type = message.attr.type;

	if message_type == "error" or message_type == "headline" or message_type == "groupchat" then

		-- TODO: Maybe handle groupchat or headline in the future.

		return;

	end

	-- Only proceed if the message contains a body.

	local body = message:get_child_text("body");

	if not body then

		return;

	end

	-- Only proceed if all sessions are "xa", or if there are no sessions.

	local sessions = prosody.hosts[host].sessions[username];

	if sessions then

		local do_send = true;

		for _, session in pairs(sessions.sessions) do

			local show = session.presence:get_child_text("show");

			if show ~= "xa" then

				do_send = false;

			end

		end

		if not do_send then

			return;

		end

	end

	-- Then do the actual request to send the SMS.

	local headers = {

		user = data.user,

		pass = data.pass,

		msg = http.urlencode(body),

	};

	http.request("https://smsapi.free-mobile.fr/sendmsg", { headers = headers }, api_handler);

end

local set_form = dataforms_new {

	title = "Set mobile.free.fr SMS credentials";

	instructions = "Enable the “Notifications by SMS” service at https://mobile.free.fr/moncompte/ and paste the credentials in this form.";

	{

		type = "hidden";

		name = "FORM_TYPE";

		value = "http://prosody.im/protocol/sms_free#set";

	};

	{

		type = "text-single";

		name = "user";

		label = "Your login on Free’s website";

	};

	{

		type = "text-single";

		name = "pass";

		label = "Your authentication key";

	};

};

local set_adhoc = adhoc_simple_form(set_form, function (data, errors, state)

	if errors then

		local errmsg = {};

		for name, text in pairs(errors) do

			errmsg[#errmsg + 1] = name .. ": " .. text;

		end

		return { status = "completed", error = { message = t_concat(errmsg, "\n") } };

	end

	local username, host = jid_split(state.from);

	module:log("debug", "Setting mobile.free.fr credentials for %s@%s: user=%s, pass=%s", username, host, data.user, data.pass);

	local ok, err = store:set(username, { user = data.user, pass = data.pass });

	if ok then

		return { status = "completed", info = "SMS notifications to your phone enabled." };

	else

		return { status = "completed", error = { message = err } };

	end

end);

module:provides("adhoc", adhoc_new("Set mobile.free.fr SMS notification credentials", "http://prosody.im/protocol/sms_free#set", set_adhoc));

module:provides("adhoc", adhoc_new("Unset mobile.free.fr SMS notifications", "http://prosody.im/protocol/sms_free#unset", function (_, data)

	if data.action ~= "execute" then

		return { status = "canceled" };

	end

	module:log("debug", "Unsetting mobile.free.fr credentials.");

	local username, host = jid_split(data.from);

	local ok, err = store:set(username, nil);

	if ok then

		return { status = "completed", info = "SMS notifications to your phone disabled." };

	else

		return { status = "completed", error = { message = err } };

	end

end));

-- Stanzas sent to local clients.

module:hook("message/bare", message_handler);

module:hook("message/full", message_handler);