-- Prosody IM

-- Copyright (C) 2008-2017 Matthew Wild

-- Copyright (C) 2008-2017 Waqas Hussain

-- Copyright (C) 2011-2017 Kim Alvefur

--

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

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

--

-- XEP-0313: Message Archive Management for Prosody

--

-- luacheck: ignore 122/prosody

local global_default_policy = module:get_option_enum("default_archive_policy", "always", "roster", "never", true, false);

local smart_enable = module:get_option_boolean("mam_smart_enable", false);

if global_default_policy == "always" then

	global_default_policy = true;

elseif global_default_policy == "never" then

	global_default_policy = false;

end

do

	-- luacheck: ignore 211/prefs_format

	local prefs_format = {

		[false] = "roster",

		-- default ::= true | false | "roster"

		-- true = always, false = never, nil = global default

		["romeo@montague.net"] = true, -- always

		["montague@montague.net"] = false, -- newer

	};

end

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

local archive_store = module:get_option_string("archive_store", "archive");

local prefs = module:open_store(archive_store .. "_prefs");

local function get_prefs(user, explicit)

	local user_sessions = sessions[user];

	local user_prefs = user_sessions and user_sessions.archive_prefs

	if not user_prefs then

		-- prefs not cached

		user_prefs = prefs:get(user);

		if not user_prefs then

			-- prefs not set

			if smart_enable and explicit then

				-- a mam-capable client was involved in this action, set defaults

				user_prefs = { [false] = global_default_policy };

				prefs:set(user, user_prefs);

			end

		end

		if user_sessions then

			-- cache settings if they originate from user action

			user_sessions.archive_prefs = user_prefs;

		end

		if not user_prefs then

			if smart_enable then

				-- not yet enabled, either explicitly or "smart"

				user_prefs = { [false] = false };

			else

				-- no explicit settings, return defaults

				user_prefs = { [false] = global_default_policy };

			end

		end

	end

	return user_prefs;

end

local function set_prefs(user, user_prefs)

	local user_sessions = sessions[user];

	if user_sessions then

		user_sessions.archive_prefs = user_prefs;

	end

	return prefs:set(user, user_prefs);

end

return {

	get = get_prefs,

	set = set_prefs,

}