#!/usr/bin/lua

local fs = require 'nixio.fs'
local site = require 'gluon.site_config'
local uci = require 'luci.model.uci'
local util = require 'luci.util'

local c = uci.cursor()


local subst = {}

subst['%%v'] = util.trim(fs.readfile('/etc/openwrt_version'))
subst['%%n'], subst['%%S'] = util.exec('. /etc/openwrt_release; echo $DISTRIB_CODENAME; echo $DISTRIB_TARGET'):match('([^\n]*)\n([^\n]*)')
subst['%%GS'] = site.site_code
subst['%%GV'] = util.trim(fs.readfile('/lib/gluon/gluon-version'))
subst['%%GR'] = util.trim(fs.readfile('/lib/gluon/release'))

function replace_patterns(url)
	for k, v in pairs(subst) do
		url = url:gsub(k, v)
	end

	return url
end

for name, config in pairs(site.autoupdater.branches) do
	c:delete('autoupdater', name)
	mirrors = {}
	for i, v in ipairs(config.mirrors) do
		mirrors[i]=replace_patterns(v)
	end
	c:section('autoupdater', 'branch', name,
		  {
			  name = config.name,
			  mirror = mirrors,
			  good_signatures = config.good_signatures,
			  pubkey = config.pubkeys,
		  }
	)
end

if not c:get('autoupdater', 'settings') then
	local enabled = 0
	local branch = site.autoupdater.branch

	local f = io.open('/lib/gluon/autoupdater/default_branch')
	if f then
		enabled = 1
		branch = f:read('*line')
		f:close()
	end

	c:section('autoupdater', 'autoupdater', 'settings',
		  {
			  enabled = enabled,
			  branch = branch,
		  }
	)
end

c:set('autoupdater', 'settings', 'version_file', '/lib/gluon/release')

c:save('autoupdater')


local autoupdater_util = require 'autoupdater.util'
autoupdater_util.randomseed()


-- Perform updates at a random time between 04:00 and 05:00, and once an hour
-- a fallback update (used after the regular updates haven't
local minute = math.random(0, 59)

local f = io.open('/usr/lib/micron.d/autoupdater', 'w')
f:write(string.format('%i 4 * * * /usr/sbin/autoupdater\n', minute))
f:write(string.format('%i 0-3,5-23 * * * /usr/sbin/autoupdater --fallback\n', minute))
f:close()