-- Load vhosts from DB on startup of Prosody XMPP server.
-- Copyright (C) 2013-2015 Sipwise GmbH <development@sipwise.com>
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

module:set_global();

local DBI = require "DBI"
local nameprep = require "util.encodings".stringprep.nameprep;
local hostmanager = require "core.hostmanager";
local configmanager = require "core.configmanager";
local ut = require "ngcp.utils";
local set = require "util.set";

local connection;
local params = module:get_option("auth_sql", module:get_option("sql"));
local prosody = _G.prosody;
local vhosts = set.new();

local function test_connection()
	module:log("debug", "test_connection");
	if not connection then return nil; end
	if connection:ping() then
		module:log("debug", "test_connection ok");
		return true;
	else
		module:log("debug", "Database connection closed");
		connection = nil;
	end
end
local function connect()
	module:log("debug", "connect");
	if not test_connection() then
		prosody.unlock_globals();
		local dbh, err = DBI.Connect(
			params.driver, params.database,
			params.username, params.password,
			params.host, params.port
		);
		prosody.lock_globals();
		if not dbh then
			module:log("debug",
				"Database connection failed: %s", tostring(err));
			return nil, err;
		end
		module:log("debug", "Successfully connected to database");
		dbh:autocommit(true); -- don't run in transaction
		connection = dbh;
		return connection;
	end
end

do -- process options to get a db connection
	params = params or { driver = "SQLite3" };

	if params.driver == "SQLite3" then
		params.database = configmanager.resolve_relative_path(
			prosody.paths.data or ".",
			params.database or "prosody.sqlite");
	end

	assert(params.driver and params.database,
		"Both the SQL driver and the database need to be specified");
	assert(connect());
end

local function getsql(sql, ...)
	if params.driver == "PostgreSQL" then
		sql = sql:gsub("`", "\"");
	end
	if not test_connection() then connect(); end
	-- do prepared statement stuff
	local stmt, err = connection:prepare(sql);
	if not stmt and not test_connection() then error("connection failed"); end
	if not stmt then
		module:log("error", "QUERY FAILED: %s %s", err, debug.traceback());
		return nil, err;
	end
	-- run query
	local ok
	ok, err = stmt:execute(...);
	if not ok and not test_connection() then error("connection failed"); end
	if not ok then return nil, err; end

	return stmt;
end

local function activate_search(host)
	module:log("debug", "activate implicit search.%s", host);
	configmanager.set("search."..host, "component_module",
		"sipwise_vjud");
	local search_config = configmanager.getconfig()["search."..host];
	hostmanager.activate("search."..host, search_config);
end

local function activate_muc(host)
	local host_modules = configmanager.get(host, "modules_enabled");
	local conference_modules = {};

	module:log("debug", "modules_enabled[%s]: %s", host,
		ut.table.tostring(host_modules));

	configmanager.set("conference."..host, "component_module",
		"muc");
	if ut.table.contains(host_modules, "shard") then
		ut.table.add(conference_modules, "sipwise_redis_mucs");
		ut.table.add(conference_modules, "shard");
	end
	if ut.table.contains(host_modules, "sipwise_pushd") then
		ut.table.add(conference_modules, "sipwise_pushd");
	end
	if ut.table.contains(host_modules, "mam") then
		ut.table.add(conference_modules, "muc_mam");
	end
	module:log("debug", "conference_modules[%s]: %s",
		"conference."..host, ut.table.tostring(host_modules));
	configmanager.set("conference."..host, "modules_enabled",
		conference_modules);
	local conference_config = configmanager.getconfig()["conference."..host];
	conference_config['restrict_room_creation'] = 'local';
	hostmanager.activate("conference."..host, conference_config);
	module:log("debug", "modules_enabled[%s]: %s", "conference."..host,
		ut.table.tostring(conference_config['modules_enabled']));
end

local function add_vhost(host)
	local host_config = { enable = true };

	module:log("debug", "activate host %s", host);
	vhosts:add(host);
	hostmanager.activate(host, host_config);

	activate_search(host);
	activate_muc(host);
end

local function load_vhosts_from_db()
	local stmt, _ = getsql("SELECT `domain` FROM `domain`");
	if stmt then
		for row in stmt:rows(true) do
			local host = nameprep(row.domain);
			add_vhost(host);
		end
	end
end

local function check_vhosts(host)
	if ut.string.starts(host, 'search.') or
	   ut.string.starts(host, 'conference.') or
	   vhosts:contains(host) then
		module:log("debug", "%s activated, nothing to do", host);
		return
	end
	module:log("info", "%s activate subdomains", host);
	activate_search(host);
	activate_muc(host);
	vhosts:add(host);
end

local function deactivate_vhost(host)
	if ut.string.starts(host, 'search.') or
	   ut.string.starts(host, 'conference.') or
	   not vhosts:contains(host) then
		module:log("debug", "%s deactivated, nothing to do", host);
		return
	end
	module:log("info", "%s deactivate subdomains", host);
	hostmanager.deactivate("search."..host, 'main domain deactivated');
	hostmanager.deactivate("conference."..host, 'main domain deactivated');
	vhosts:remove(host);
end

module:hook("server-started", load_vhosts_from_db);
module:hook("host-activated", check_vhosts);
module:hook("host-deactivated", deactivate_vhost);