#!/usr/bin/lua

local bit = require('bit32')
local util = require ('gluon.util')
local unistd = require('posix.unistd')
local fcntl = require('posix.fcntl')
local hoodutil = require('hoodselector.util')

-- PID file to ensure the hoodselector isn't running parallel
local lockfile = '/var/lock/hoodselector.lock'
local lockfd, err = fcntl.open(lockfile, bit.bor(fcntl.O_WRONLY, fcntl.O_CREAT), 384) -- mode 0600

if not lockfd then
	util.log(err, true)
	os.exit(1)
end

local ok, _ = fcntl.fcntl(lockfd, fcntl.F_SETLK, {
	l_start = 0,
	l_len = 0,
	l_type = fcntl.F_WRLCK,
	l_whence = unistd.SEEK_SET,
})

if not ok then
	io.stderr:write(string.format(
		"Unable to lock file %s. Make sure there is no other instance of the hoodselector running.\n",
		lockfile
	))
	os.exit(1)
end

-- geolocation mode
-- If we have a location we will try to select the domain corresponding to this location.
-- If no domain for the location has been defined or if we can't determine the node's location,
-- we will select the default domain as last fallback instance.
local geo = hoodutil.get_geolocation()
if geo.lat ~= nil and geo.lon ~= nil then
	io.stdout:write('Position found. Enter "geolocation mode" ...\n')
	local jdomains = hoodutil.get_domains()
	local geo_base_domain = hoodutil.get_domain_by_geo(jdomains, geo)
	if geo_base_domain ~= nil then
		if hoodutil.set_domain_config(geo_base_domain) then
			util.log('Domain set by geolocation mode.', true)
		end
		return
	end
	io.stdout:write('No domain has been defined for the current position. Continue with default domain mode\n')
else
	io.stdout:write('No position found. Continue with default domain mode\n')
end

-- default domain mode
hoodutil.set_domain_config(hoodutil.get_default_domain(hoodutil.get_domains()))
