--
--  rhnop
--
--  Copyright (C) 2011 Christian Pointner <equinox@helsinki.at>
--
--  This file is part of rhnop.
--
--  rhnop is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 3 of the License, or
--  any later version.
--
--  rhnop 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 General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with rhnop. If not, see <http://www.gnu.org/licenses/>.
--

local queue_name = "/rhnop"

mq = require "luamq"
tempstorage = require "tempstorage"
rddb = require "rddb"

function handle_now(timestamp, nowcart, nowlen)
   local results, err = rddb:getCartInfo(nowcart);
   if results == nil then
      io.stderr:write("can't fetch cart info: " .. err .. "\n")
   else
      -- TODO: insert into tempstorage
      print(timestamp .. " Info: '" .. results.TITLE .. "' von '" .. results.ARTIST .. "' aus '" .. results.ALBUM .. "'")
      pipe.signal()
   end
end

function handle_message(msg)
   local timestamp, nowcart, nowlen, nextcart, nextlen = string.match(msg, "^(%d+) (%d+) (%d+) (%d+) (%d+)$");
   if not timestamp or not nowcart or not nowlen or not nextcart or not nextlen then
      io.stderr:write("ignoring malformed message\n")
   else
      -- TODO sanity checks: is now info new or just next?
      handle_now(timestamp, nowcart, nowlen)
      -- TODO handle next info
   end
end

function main_loop()
   local q, err = mq.create(queue_name, "ro")
   if q == nil then
      io.stderr:write("creation of message queue failed: " .. err .. "\n")
      os.exit(1)
   end
   
   local ret, err = tempstorage:init()
   if ret == nil then
      io.stderr:write("creation of tempstorage failed: " .. err .. "\n")
      os.exit(1)
   end

   local ret, err = rddb:init()
   if ret == nil then
      io.stderr:write("opening rivendell db failed: " .. err .. "\n")
      tempstorage:close()
      os.exit(1)
   end

   while true do
      local msg, prio = mq.receive(q)
      if msg == nil then
         io.stderr:write("recv error: " .. prio .. "\n")
         rddb:close()
         tempstorage:close()
         os.exit(2)
      end
      handle_message(msg)
   end
end