#!/usr/bin/lua

--! LibreMesh
--! Copyright (C) 2019  Marcos Gutierrez <gmarcos@altermundi.net>
--! Copyright (C) 2019  Luandro <luandro@gmail.com>
--! Copyright (C) 2020  Santiago Piccinini <spiccinini@altermundi.net>
--!
--! This program is free software: you can redistribute it and/or modify
--! it under the terms of the GNU Affero General Public License as
--! published by the Free Software Foundation, either version 3 of the
--! License, or (at your option) any later version.
--!
--! This program is distributed in the hope that it will be useful,
--! but WITHOUT ANY WARRANTY; without even the implied warranty of
--! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--! GNU Affero General Public License for more details.
--!
--! You should have received a copy of the GNU Affero General Public License
--! along with this program.  If not, see <http://www.gnu.org/licenses/>.

local json = require("luci.jsonc")
local uci = require("uci")
local uci_conf = uci.cursor()
local vouchera = require("voucher.vouchera")
local utils = require("voucher.utils")

--! This script loads the new shared-state information of the vouchers into the local database.

vouchera.init()

--! load the shared-state database
local shared_db = {}
local input_table = json.parse(io.stdin:read("*all"))
for key, value in pairs(input_table) do
    local voucher = vouchera.voucher(value.data)
    if voucher then
        shared_db[key] = voucher
    end
end

local new_voucher_info = false
for key, shared_voucher in pairs(shared_db) do
    local local_voucher = vouchera.get_by_id(shared_voucher.id)
    if local_voucher and local_voucher ~= shared_voucher then
        if shared_voucher.mod_counter > local_voucher.mod_counter then
            --! new information, local voucher needs to be updated
            utils.log("debug", "generate_vouchers - updating voucher " .. local_voucher.id)
            vouchera.update_with(shared_voucher)
            new_voucher_info = true
        elseif shared_voucher.mod_counter == local_voucher then
            utils.log("warning", "generate_vouchers - vouchers differ but have the same mod_counter!")
        else
            utils.log("debug", "generate_vouchers - disregard shared-state voucher as we have newer data")
        end
    elseif local_voucher == nil then
        if not vouchera.should_be_pruned(shared_voucher) then
            utils.log("debug", "generate_vouchers - adding new voucher " .. shared_voucher.id)
            vouchera.update_with(shared_voucher)
            new_voucher_info = true
        end
    end
end

-- If there is updated status from the shared-state trigger captive-portal to update the firewall
if new_voucher_info then
    os.execute('captive-portal update')
end